CN115706750B - Color temperature calibration method, color temperature calibration device and storage medium - Google Patents

Abstract

The disclosure relates to a color temperature calibration method, a color temperature calibration device and a storage medium. The color temperature calibration method comprises the following steps: the background picture is displayed in the test environment through the control terminal, the ambient light color temperature acquisition is conducted through the color temperature sensor under the control screen to obtain an ambient color temperature acquisition value corresponding to the background picture, the ambient color temperature acquisition value is subjected to color temperature calibration based on the acquired color temperature calibration data, the ambient color temperature calibration value is obtained, and the accuracy of the color temperature calibration data is determined according to the ambient color temperature calibration value and the actual color temperature value in the test environment. Therefore, the calibration process of calibrating the ambient color temperature acquisition value by using the color temperature calibration data by using the test environment is tested, so that the accuracy of the color temperature calibration process is improved.

Description

Color temperature calibration method, color temperature calibration device and storage medium

Technical Field

The present disclosure relates to the field of image processing, and in particular to a color temperature calibration method, a color temperature calibration device and a storage medium.

Background technique

With the development of science and technology and the improvement of users' aesthetic level, the requirements for images taken by terminals are getting higher and higher. A color temperature sensor is set on the terminal to collect the color temperature of the external environment. The terminal uses the collected external environment color temperature to optimize the captured image, improve the color cast problem of the image, and make the image presentation effect better.

In the related art, a hole is usually opened on the terminal to place a color temperature sensor to collect the color temperature of the external environment. With the popularity of full-screen displays, more and more terminals need to place color temperature sensors under the screen. After placing the color temperature sensor under the screen, the light leakage of the screen itself will interfere with the accuracy of the color temperature data collected by the color temperature sensor under the screen. After using the existing solution to eliminate the interference of screen light leakage on the color temperature sensor, whether this solution really improves the accuracy of the color temperature data remains to be verified.

Summary of the invention

In order to overcome the problems existing in the related art, the present disclosure provides a color temperature calibration method, a color temperature calibration device and a storage medium.

According to a first aspect of an embodiment of the present disclosure, a color temperature calibration method is provided, which is applied to a terminal, wherein the terminal includes an under-screen color temperature sensor, and the color temperature calibration method includes:

Acquire color temperature calibration data; control the terminal to display at least one background image under a preset test environment, and control the under-screen color temperature sensor to collect the color temperature of ambient light to obtain at least one ambient color temperature collection value, wherein the ambient color temperature collection value has a one-to-one correspondence with the background image; based on the color temperature calibration data, perform color temperature calibration on the at least one ambient color temperature collection value to obtain an ambient color temperature calibration value; based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment, determine the accuracy of the color temperature calibration based on the color temperature calibration data.

In one implementation, the color temperature calibration data includes a screen color component, a screen brightness component, and an ambient light transmittance component, and is determined in the following manner:

In a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, the terminal is controlled to display a monochrome picture corresponding to a color channel at a maximum display brightness, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a monochrome picture is used as the screen color component; in a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, the terminal is controlled to display a pure white picture at different display brightnesses, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a pure white picture is used as the screen brightness component; in a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the terminal is controlled to turn off the screen, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component.

In one implementation, controlling the terminal to display at least one background image under a preset test environment includes:

The terminal is controlled to display at least one background picture under a test environment provided by a test light box; the test light box has the same color temperature as the calibration light box, but a different ambient light brightness.

In one implementation, displaying at least one background image includes:

A corresponding background image group is displayed for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with brightness higher than a first brightness threshold in the color corresponding to the color channel, and a second background image with brightness lower than a second brightness threshold, and the first brightness threshold is greater than the second brightness threshold.

In one implementation, determining the accuracy of color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment includes:

If the differences between the ambient color temperature calibration values corresponding to each background picture in the background picture group corresponding to each color channel in all color channels and the actual ambient color temperature values under the test environment are all less than the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is accurate; if the difference between any ambient color temperature calibration value in each background picture in the background picture group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is greater than or equal to the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate.

According to a second aspect of an embodiment of the present disclosure, a color temperature calibration device is provided, which is applied to a terminal, wherein the terminal includes an under-screen color temperature sensor, and the color temperature calibration device includes:

An acquisition unit is used to acquire color temperature calibration data; a control unit is used to control the terminal to display at least one background image under a preset test environment, and control the under-screen color temperature sensor to collect the color temperature of ambient light to obtain at least one ambient color temperature collection value, and there is a one-to-one correspondence between the ambient color temperature collection value and the background image; a calibration unit is used to perform color temperature calibration on the at least one ambient color temperature collection value based on the color temperature calibration data to obtain an ambient color temperature calibration value; a determination unit is used to determine the accuracy of the color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment.

In one implementation, the color temperature calibration data includes a screen color component, a screen brightness component, and an ambient light transmittance component, and is determined in the following manner:

In a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, the terminal is controlled to display a monochrome picture corresponding to a color channel at a maximum display brightness, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a monochrome picture is used as the screen color component; in a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, the terminal is controlled to display a pure white picture at different display brightnesses, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a pure white picture is used as the screen brightness component; in a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the terminal is controlled to turn off the screen, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component.

In one embodiment, the control unit is used to:

The terminal is controlled to display at least one background picture under a test environment provided by a test light box; the test light box has the same color temperature as the calibration light box, but a different ambient light brightness.

In one embodiment, the control unit is used to:

A corresponding background image group is displayed for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with brightness higher than a first brightness threshold in the color corresponding to the color channel, and a second background image with brightness lower than a second brightness threshold, and the first brightness threshold is greater than the second brightness threshold.

In one implementation, the determining unit includes:

If the differences between the ambient color temperature calibration values corresponding to each background picture in the background picture group corresponding to each color channel in all color channels and the actual ambient color temperature values under the test environment are all less than the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is accurate; if the difference between any ambient color temperature calibration value in each background picture in the background picture group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is greater than or equal to the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate.

According to a third aspect of an embodiment of the present disclosure, a color temperature calibration device is provided, including:

A processor; a memory for storing processor executable instructions; wherein the processor is configured to execute the color temperature calibration method described in any one of the embodiments of the first aspect or the second aspect.

According to the fourth aspect of an embodiment of the present disclosure, a non-temporary computer-readable storage medium is provided. When the instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute the color temperature calibration method described in any one of the embodiments of the first aspect or the second aspect.

The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: by controlling the terminal to display a background picture in a test environment, and controlling the under-screen color temperature sensor to collect the color temperature of the ambient light to obtain an ambient color temperature collection value corresponding to the background picture, color temperature calibration is performed on the ambient color temperature collection value based on the acquired color temperature calibration data to obtain an ambient color temperature calibration value, and the accuracy of the color temperature calibration data is determined based on the ambient color temperature calibration value and the actual color temperature value in the test environment. In this way, the calibration process of calibrating the ambient color temperature collection value with the color temperature calibration data is tested using the test environment to improve the accuracy of the color temperature calibration process.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

Fig. 1 is a flow chart showing a color temperature calibration method according to an exemplary embodiment.

Fig. 2 is a schematic diagram of a darkroom according to an exemplary embodiment.

Fig. 3 is a schematic diagram showing a method of acquiring color temperature calibration data according to an exemplary embodiment.

Fig. 4 is a schematic diagram showing a test method for color temperature calibration according to an exemplary embodiment.

Fig. 5 is a block diagram of a color temperature calibration device according to an exemplary embodiment.

Fig. 6 is a block diagram showing a device for color temperature calibration according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

In recent years, the design of terminals has become more user-friendly. For example, a color temperature sensor is configured for the terminal to detect the brightness of the ambient light in the terminal so as to adjust the brightness of the terminal display screen, thereby improving the comfort of the user when browsing the screen. Another example is to compensate the color correction of the display screen through the color temperature sensor so that the color of the taken photo is closer to the actual scene. The expected effect of the terminal screen brightness changing with the environment in which the terminal is located, and the realization of the photo effect close to the actual scene, rely on the color temperature sensor to collect accurate ambient color temperature values, but the ambient color temperature value collected by the color temperature sensor has errors. The main reason for the error in the ambient color temperature value collected by the color temperature sensor is that in order to adapt to the full-screen design of the terminal, the color temperature sensor is set below the full-screen of the terminal, and the current full-screen adopts OLED (Organic Light-Emitting Diode, organic light-emitting diode) display technology. Therefore, when the color temperature sensor is installed below the self-luminous display screen, in addition to receiving the ambient light through the screen, it will also directly receive the downward leakage of the OLED screen. At the same time, as the brightness of the display screen and the background picture change, the intensity of the leakage light greatly affects the accuracy of the collected ambient color temperature value. In the related art, many methods are provided to calibrate the ambient color temperature value collected by the color temperature sensor to reduce the impact of terminal screen leakage on the color temperature sensor, but it is uncertain whether the color temperature calibration method can achieve the purpose of color temperature calibration.

In view of this, the embodiment of the present disclosure provides a color temperature calibration method for testing the calibrated ambient color temperature value to determine the accuracy of the color temperature calibration. The color temperature calibration method places a terminal in a test environment, controls the terminal to display a pre-set background picture, and controls the color temperature sensor to collect the color temperature of the ambient light to obtain an ambient color temperature collection value corresponding to the background picture, performs color temperature calibration on the ambient color temperature collection value based on the acquired color temperature calibration data to obtain an ambient color temperature calibration value; determines whether the deviation between the ambient color temperature calibration value and the actual ambient color temperature value under the test environment meets the set accuracy requirement, if the deviation between the ambient color temperature calibration value and the actual ambient color temperature value under the test environment meets the set accuracy requirement, then determines that the color temperature calibration based on the color temperature calibration data is accurate, if the deviation between the ambient color temperature calibration value and the actual ambient color temperature value under the test environment does not meet the set accuracy requirement, then determines that the color temperature calibration based on the color temperature calibration data is inaccurate.

It should be noted that, for the sake of simplicity, this embodiment refers to the color temperature sensor disposed below the terminal display screen as the under-screen color temperature sensor. However, those skilled in the art should understand that this embodiment is not limited to the under-screen color temperature sensor, and a color temperature sensor disposed on the terminal by opening a hole or other means, if the color temperature calibration method corresponding to the embodiment of the present disclosure is adopted, should also be within the scope of protection of the embodiment of the present disclosure.

Furthermore, the terminal involved in the embodiments of the present disclosure may also be referred to as a terminal device, device, mobile station (MS), mobile terminal (MT), etc., which is a device that provides voice and/or data connectivity to users. For example, UE may be a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of UE are: a smart phone (Mobile Phone), a pocket computer (Pocket Personal Computer, PPC), a handheld computer, a personal digital assistant (Personal Digital Assistant, PDA), a laptop computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. It should be understood that the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal.

FIG1 is a flow chart of a color temperature calibration method according to an exemplary embodiment. The color temperature calibration method provided in this embodiment is applied to a terminal, and the terminal includes an under-screen color temperature sensor. As shown in FIG1 , the color temperature calibration method includes the following steps.

In step S11 , color temperature calibration data is acquired.

In this step, on the one hand, the color temperature calibration data can be obtained by the terminal in real time. On the other hand, the color temperature calibration data can be data pre-stored in the terminal.

In the disclosed embodiment, the color temperature calibration data is used to characterize the data for color temperature calibration of the color temperature sensor. The color temperature calibration data characterizes the deviation value of the interference of the terminal screen leakage light on the under-screen color temperature sensor, and the color temperature calibration data is used to calibrate the ambient color temperature collection value collected by the under-screen color temperature sensor to obtain an ambient color temperature value that meets the accuracy requirements.

In step S12, the control terminal displays at least one background picture under a preset test environment, and controls the color temperature sensor under the screen to collect the color temperature of the ambient light to obtain at least one ambient color temperature collection value.

In this embodiment, the test environment is provided by a closed space, and the size of the closed space needs to be sufficient to place the terminal to be tested. When testing the accuracy of color temperature calibration, an environment with set ambient color temperature and brightness is provided in the closed space, where the ambient color temperature and brightness are set according to the test needs. For example, the closed space is a box, and a light source is provided in the box. In order to ensure that the terminal screen is completely covered by light, a surface light source can be selected. In this embodiment, the closed box with a surface light source is called a light box.

The terminal to be tested is placed in a light box for testing, the color temperature in the light box is adjusted to the set test environment color temperature, and the brightness in the light box is adjusted to the set test environment brightness, and the test environment color temperature and the test environment brightness are used to provide the terminal to be tested with a test environment for the accuracy test of color temperature calibration. The terminal is controlled to display background pictures in the test environment, and the number of background pictures and the content of the background pictures are set according to the actual test scene, which is not specifically limited in this embodiment. The purpose of displaying the background picture is to simulate the effect of light leakage generated by the picture displayed on the terminal screen on the color temperature of the ambient light collected by the color temperature sensor under the screen when the terminal is used in real life. When the terminal displays the background picture, the color temperature sensor under the screen is controlled to collect the color temperature of the ambient light to obtain the color temperature collection value of the ambient light, which is used to characterize the color temperature value of the ambient light collected by the color temperature sensor under the screen under the current test environment color temperature, the test environment brightness, and the background picture. There is a one-to-one correspondence between the ambient color temperature collection value and the background picture. For example, if there are X background pictures, there are X ambient color temperature collection values corresponding to them, where X is an integer.

In step S13, color temperature calibration is performed on at least one ambient color temperature acquisition value based on the color temperature calibration data to obtain an ambient color temperature calibration value.

In this step, when color temperature calibration data is used to calibrate the ambient color temperature collection value, if there are multiple ambient color temperature collection values, it is necessary to perform color temperature calibration on the ambient color temperature collection values one by one based on the color temperature calibration data. The color temperature calibration process may be to remove the color temperature calibration data from the ambient color temperature collection value to obtain the ambient color temperature calibration value after the color temperature calibration data is removed. The ambient color temperature calibration data refers to the inaccurate component of the ambient color temperature collection value collected by the under-screen color temperature sensor due to light leakage from the terminal screen.

In one embodiment, the color temperature calibration data includes a screen color component, a screen brightness component, and an ambient light transmittance component. It can be understood that due to the presence of interference components such as the screen color component, the screen brightness component, and the ambient light transmittance component, the ambient color temperature acquisition value collected by the under-screen color temperature collector is inaccurate. Therefore, the process of color temperature calibration using color temperature calibration data can essentially be understood as a process of removing interference components from the screen color dimension, the screen brightness dimension, and the ambient light transmittance dimension, respectively. That is, the above process of removing the color temperature calibration data from the ambient color temperature acquisition value to obtain the ambient color temperature calibration value after removing the color temperature calibration data can be understood as applying an interference elimination algorithm to remove interference components such as the screen color component, the screen brightness component, and the ambient light transmittance component in the color temperature calibration data from the ambient color temperature acquisition value collected by the under-screen color temperature sensor, and finally obtaining the ambient color temperature calibration value.

The interference elimination algorithm mentioned above may apply the algorithm involved in the related technology, and the embodiments of the present disclosure do not limit this.

In step S14, based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment, the accuracy of the color temperature calibration based on the color temperature calibration data is determined.

In this embodiment, when the difference between the ambient color temperature calibration value and the actual ambient color temperature value is within the set range, it indicates that the accuracy of the color temperature calibration performed by the color temperature calibration data meets the requirements, that is, the color temperature calibration performed by the color temperature calibration data eliminates the influence of screen light leakage in the ambient color temperature acquisition value, verifies the accuracy of the color temperature calibration data, and further ensures the accuracy of the ambient color temperature calibration value. When the difference between the ambient color temperature calibration value and the actual ambient color temperature value is not within the set range, it indicates that the accuracy of the color temperature calibration performed by the color temperature calibration data does not meet the requirements. In other words, the color temperature calibration performed by the color temperature calibration data does not eliminate the interference of screen light leakage on the ambient color temperature acquisition value, and the color temperature calibration data does not achieve the purpose of color temperature calibration.

In the embodiment of the present disclosure, the color temperature calibration data includes a screen color component, a screen brightness component and/or an ambient light transmittance component. In this embodiment, the determination methods of the screen color component, the screen brightness component and the ambient light transmittance component are respectively described.

In this embodiment, in a dark room calibration environment where the ambient light brightness is lower than the brightness threshold, the terminal is controlled to display a monochrome picture corresponding to the color channel at the maximum display brightness, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a monochrome picture is used as the screen color component.

The darkroom calibration environment can be a closed space and the ambient brightness in the closed space is lower than the brightness threshold. It can also be an open space and the ambient brightness in the open space is lower than the brightness threshold. The brightness threshold can be set according to the actual scenario, and this embodiment does not specifically limit it. This embodiment takes the darkroom calibration environment as an example. As shown in FIG2 , the terminal 11 is placed in the darkroom calibration environment generated by the darkroom 10, and the terminal 11 is controlled to display the monochrome picture corresponding to the color channel at the maximum display brightness of the screen. Taking the under-screen color temperature sensor as an RGB sensor as an example, a monochrome picture refers to a picture of three colors: red, green and blue. The under-screen color temperature sensor is controlled to collect data under each monochrome picture, and the data collected by the under-screen color temperature sensor when displaying a monochrome picture is used as the screen color component.

In this embodiment, in a dark room calibration environment where the ambient light brightness is lower than the brightness threshold, the terminal is controlled to display a pure white picture at different display brightnesses, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when displaying a pure white picture is used as the screen brightness component.

In a darkroom calibration environment, the brightness is controlled to be adjusted according to the set adjustment steps, and the terminal is controlled to display a pure white picture at each brightness, eliminating the interference of screen light leakage on the color temperature sensor data when the terminal screen displays a monochrome picture. The color temperature sensor under the screen is controlled to collect corresponding data when displaying a pure white picture at each brightness, and the data collected by the color temperature sensor under the screen when displaying a pure white picture is used as the screen brightness component.

In this embodiment, in a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the control terminal turns off the screen and controls the under-screen color temperature sensor to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component.

The calibration light box is a closed space in which a fixed ambient light brightness and color temperature are set to form a calibration environment. The terminal is placed in the calibration light box and the terminal screen is turned off. At this time, the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component.

In the actual calibration process, the screen color component, screen brightness component and ambient light transmittance component can be determined in sequence, and after determining one component, the interference of the determined component on the color temperature sensor under the screen is removed before determining the next component, and then the next component is determined. This embodiment takes this determination order as an example, but is not limited to this determination order. The user can arbitrarily design the determination order according to the actual calibration needs. It is also possible to first determine the screen color component, screen brightness component and ambient light transmittance component, and then uniformly perform color temperature calibration on the ambient color temperature collection values collected by the color temperature sensor under the screen.

After determining the color temperature calibration data (screen color component, screen brightness component and ambient light transmittance component), test whether the color temperature calibration performed on the ambient color temperature value collected by the under-screen color temperature sensor using the color temperature calibration data is accurate.

In the disclosed embodiment, when testing the accuracy of color temperature calibration, the control terminal displays at least one background image under a preset test environment, and controls the color temperature sensor under the screen to collect the ambient color temperature collection value corresponding to each background image, and uses the color temperature calibration data to perform color temperature calibration on each ambient color temperature collection value to obtain the ambient color temperature calibration value. It is further determined whether the ambient color temperature calibration values corresponding to all background images meet the requirements of color temperature calibration accuracy. If all ambient color temperature calibration values meet the requirements of color temperature calibration accuracy, it indicates that the ambient color temperature collection value can be accurately calibrated through the color temperature calibration data, and the interference of screen leakage on the color temperature sensor under the screen is removed. If there are one or more ambient color temperature calibration values that do not meet the requirements of color temperature calibration accuracy among all ambient color temperature calibration values, it indicates that the ambient color temperature collection value cannot be accurately calibrated through the color temperature calibration data. In other words, the ambient color temperature collection value can be accurately calibrated through the color temperature calibration data, indicating that the acquired color calibration data is accurate.

During the test, the terminal to be tested is placed in a test light box, and the terminal is controlled to display at least one background image under the test environment provided by the test light box. The test light box has the same color temperature as the calibration light box, but different ambient light brightness, so as to test the accuracy of the color temperature calibration data. For example, when the terminal obtains the color temperature calibration data, it determines the ambient light transmittance component by calibrating the environment in the light box with a color temperature of 4500 Kelvin (K) and a brightness of 200 lux (LUX), and then sets the test environment in the test light box with a color temperature of 4500K and a brightness of 400LUX.

In one embodiment, at least one background image is displayed on the screen of the control terminal, including displaying a corresponding background image group for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with a brightness higher than a first brightness threshold value and a second background image with a brightness lower than a second brightness threshold value in the color corresponding to the color channel, and the first brightness threshold value is greater than the second brightness threshold value.

In this embodiment, a background image is displayed on the terminal screen to simulate the interference of light leakage of the terminal on the color temperature sensor under the screen in an actual scene. The ambient light in the test environment is collected by the color temperature sensor under the screen through the screen, and the light generated by the background image displayed on the terminal screen is also collected by the color temperature collector under the screen due to light leakage from the screen. The color channel values received by the terminal in the test environment are collected by the color temperature sensor under the screen, and the ambient color temperature collection value is obtained based on the color channel values. The channels here may include, but are not limited to, RGBC, etc., where R is the red channel, G is the green channel, B is the blue channel, and C is the full spectrum channel. In addition, IR channels, etc. may also be included, which are not limited in this embodiment.

In order to more clearly illustrate that the corresponding background image group is displayed for each color channel in all color channels, this embodiment takes the under-screen color temperature sensor as an RGB sensor as an example for explanation. A first background image group is set for the R channel among the three RGB color channels, and the first background image group includes a bright red image with a brightness higher than the first brightness threshold in the color corresponding to the R channel as the first background image, and a dark red image with a brightness lower than the second brightness threshold as the second background image. A second background image group is set for the G channel, and the second background image group includes a bright green image with a brightness higher than the first brightness threshold in the color corresponding to the G channel as the first background image, and a dark green image with a brightness lower than the second brightness threshold as the second background image. A third background image group is set for the B channel, and the first background image group includes a bright blue image with a brightness higher than the first brightness threshold in the color corresponding to the B channel as the first background image, and a dark blue image with a brightness lower than the second brightness threshold as the second background image. It should be noted that the first brightness threshold in each color channel is greater than the second brightness threshold.

In an embodiment of the present disclosure, based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment, the accuracy of color temperature calibration based on the color temperature calibration data is determined, including: if the difference between the ambient color temperature calibration value corresponding to each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is less than the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is accurate. For each color channel in all color channels, the corresponding background image group is displayed, each background image group includes one or more background images, and the screen of the color temperature sensor acquisition terminal under the control screen is displayed. The ambient color temperature calibration value corresponding to each background image is compared with the actual ambient color temperature value under the test environment. If the difference between all the ambient color temperature calibration values and the actual ambient color temperature value under the test environment is less than the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is accurate. If the difference between any ambient color temperature calibration value and the actual ambient color temperature value under the test environment in the background image group corresponding to each color channel in all color channels is greater than or equal to the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate. In this embodiment, the color temperature threshold can be set according to the test accuracy. The smaller the color temperature threshold is, the more accurate the color temperature calibration based on the color temperature calibration data is.

Exemplarily, FIG3 is a schematic diagram of obtaining color temperature calibration data according to an exemplary embodiment. As shown in FIG3, in this embodiment, the color temperature calibration data is determined by darkroom calibration and light box calibration, wherein in the darkroom calibration, the screen color component and the screen brightness component are determined by providing a darkroom calibration environment, and the ambient light transmittance component is determined by calibrating the calibration environment in the light box. The darkroom calibration is used to calibrate the interference caused by screen light leakage, and the light box calibration process is used to calibrate the interference caused by screen transmittance.

Place the terminal in a darkroom calibration environment and perform darkroom calibration.

In the darkroom calibration, the pure screen color impact calibration is performed first. That is, the terminal screen is controlled to display a red picture at 100% brightness and the color temperature sensor under the screen is controlled to collect data, then the terminal screen is controlled to display a green picture at 100% brightness and the color temperature sensor under the screen is controlled to collect data, and then the terminal screen is controlled to display a blue picture at 100% brightness and the color temperature sensor under the screen is controlled to collect data, and the collected data is recorded as the screen color component.

In the darkroom calibration, the pure screen brightness effect calibration is performed. That is, the terminal screen is controlled to display a pure white picture, and the terminal screen brightness is controlled to display from the default initial value to the maximum display brightness according to the set adjustment amount, for example, from 10% to 100%, and each brightness is displayed one by one. The color temperature sensor under the control screen collects data at each brightness, and the collected data is recorded as the screen brightness component.

After the darkroom calibration, the light box calibration is performed, that is, the calibration is affected by the pure ambient color, and a closed light with fixed brightness and color temperature is designed in the light box. In this embodiment, the calibration environment of 5000K color temperature and 200LUX brightness is taken as an example. The terminal is placed in the calibration environment provided by the calibration light box, the terminal screen is turned off, and the sensor under the screen is controlled to collect data after passing through the terminal screen, which is recorded as the ambient light transmittance component. In this embodiment, before the light box calibration is performed, in order to ensure the accuracy of the calibration environment in the calibration light box, the calibration environment in the calibration light box is calibrated in advance. For example, the calibration light box is set to provide a calibration environment with a color temperature of 5000K and a brightness of 200LUX, but there is actually a deviation. For example, the actual calibration light box provides a calibration environment with a color temperature of 5001K and a brightness of 220LUX. In order to reduce the deviation, the display deviation value between the set value and the actual value in the calibration environment is pre-determined, and the set value is calibrated using the display deviation value to obtain a calibration environment that meets actual needs. The display deviation value that characterizes the set value and the actual value in the calibration environment is called the golden machine data.

In the above process, the screen color component can be removed when the screen brightness component is collected, and the interference of the screen color component and the screen brightness component on the color temperature sensor under the screen can be removed when the light box calibration is performed.

FIG4 is a test schematic diagram of a color temperature calibration method according to an exemplary embodiment. The terminal calibrated in FIG3 is subjected to a color temperature calibration accuracy test to detect the effect of the color temperature calibration. This embodiment provides a test light box, and sets a test environment of 5000K color temperature and 500LUX brightness in the test light box. In order to test the accuracy of color temperature calibration through screen color components, screen brightness components, and ambient light transmittance components, the test environment in the test light box needs to meet the same color temperature and different ambient light brightness as the calibration environment. It can be seen that the test environment is 5000K color temperature and 500LUX brightness, while the calibration environment is 5000K color temperature and 200LUX brightness, so the test light box meets the test requirements.

The terminal to be tested is placed in a test light box, the screen is controlled to display 6 corresponding background pictures, and the color temperature sensor under the screen is controlled to collect the ambient color temperature collection value. The color temperature calibration data obtained in FIG3 is used to perform color temperature calibration on the 6 ambient color temperature collection values corresponding to the 6 background pictures, and 6 ambient color temperature calibration values are obtained; if the difference between each ambient color temperature calibration value and the actual ambient color temperature value of 5000K is less than the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is accurate, and if there is any ambient color temperature calibration value and the actual ambient color temperature value of 5000K The difference is greater than or equal to the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate. The 6 background pictures in this embodiment are bright red background picture, dark red background picture, bright green background picture, dark green background picture, bright blue background picture and dark blue background picture, respectively, and can also be 8 pictures, and gray background pictures are added on the basis of the above 6 pictures, and more can be obtained, which is not specifically limited in this embodiment.

Based on the same concept, an embodiment of the present disclosure also provides a color temperature calibration device.

It is understandable that the color temperature calibration device provided in the embodiment of the present disclosure includes hardware structures and/or software modules corresponding to the execution of each function in order to realize the above functions. In combination with the units and algorithm steps of each example disclosed in the embodiment of the present disclosure, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present disclosure.

FIG5 is a block diagram of a color temperature calibration device according to an exemplary embodiment. The color temperature calibration device 100 is applied to a terminal, and the terminal includes an under-screen color temperature sensor. Referring to FIG5 , the device 100 includes an acquisition unit 101, a control unit 102, a calibration unit 103 and a determination unit 104.

The acquisition unit 101 is used to acquire color temperature calibration data; the control unit 102 is used to control the terminal to display at least one background image under a preset test environment, and control the under-screen color temperature sensor to collect the color temperature of ambient light, and obtain at least one ambient color temperature collection value, and there is a one-to-one correspondence between the ambient color temperature collection value and the background image; the calibration unit 103 is used to perform color temperature calibration on at least one ambient color temperature collection value based on the color temperature calibration data, and obtain the ambient color temperature calibration value; the determination unit 104 is used to determine the accuracy of the color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment.

In one implementation, the color temperature calibration data includes a screen color component, a screen brightness component, and an ambient light transmittance component, and is determined in the following manner:

In a darkroom calibration environment where the ambient light brightness is lower than the brightness threshold, the control terminal displays a monochrome picture corresponding to the color channel at the maximum display brightness, and controls the under-screen color temperature sensor to collect data, and uses the data collected by the under-screen color temperature sensor when displaying the monochrome picture as the screen color component; in a darkroom calibration environment where the ambient light brightness is lower than the brightness threshold, the control terminal displays a pure white picture at different display brightnesses, and controls the under-screen color temperature sensor to collect data, and uses the data collected by the under-screen color temperature sensor when displaying the pure white picture as the screen brightness component; in a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the control terminal turns off the screen, and controls the under-screen color temperature sensor to collect data, and uses the data collected by the under-screen color temperature sensor when the screen is turned off as the ambient light transmittance component.

In one embodiment, the control unit 102 is configured to:

The control terminal displays at least one background image under a test environment provided by a test light box; the test light box has the same color temperature as the calibration light box, but a different ambient light brightness.

In one embodiment, the control unit 102 is configured to:

A corresponding background image group is displayed for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with brightness higher than a first brightness threshold in the color corresponding to the color channel, and a second background image with brightness lower than a second brightness threshold, and the first brightness threshold is greater than the second brightness threshold.

In one implementation, the determining unit 104 includes:

If the differences between the ambient color temperature calibration values corresponding to each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature values under the test environment are all less than the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is accurate; if the difference between any ambient color temperature calibration value of each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is greater than or equal to the color temperature threshold, then it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate.

Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

Fig. 6 is a block diagram of a color temperature calibration device 200 according to an exemplary embodiment. For example, the device 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

6 , apparatus 200 may include one or more of the following components: a processing component 202 , a memory 204 , a power component 206 , a multimedia component 208 , an audio component 210 , an input/output (I/O) interface 212 , a sensor component 214 , and a communication component 216 .

The processing component 202 generally controls the overall operation of the device 200, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 202 may include one or more processors 220 to execute instructions to perform all or part of the steps of the above-described method. In addition, the processing component 202 may include one or more modules to facilitate interaction between the processing component 202 and other components. For example, the processing component 202 may include a multimedia module to facilitate interaction between the multimedia component 208 and the processing component 202.

The memory 204 is configured to store various types of data to support operations on the device 200. Examples of such data include instructions for any application or method operating on the device 200, contact data, phone book data, messages, pictures, videos, etc. The memory 204 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

The power component 206 provides power to the various components of the device 200. The power component 206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 200.

The multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 208 includes a front camera and/or a rear camera. When the device 200 is in an operating mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 210 is configured to output and/or input audio signals. For example, the audio component 210 includes a microphone (MIC), and when the device 200 is in an operating mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 204 or sent via the communication component 216. In some embodiments, the audio component 210 also includes a speaker for outputting audio signals.

I/O interface 212 provides an interface between processing component 202 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 214 includes one or more sensors for providing various aspects of the status assessment of the device 200. For example, the sensor assembly 214 can detect the open/closed state of the device 200, the relative positioning of components, such as the display and keypad of the device 200, and the sensor assembly 214 can also detect the position change of the device 200 or a component of the device 200, the presence or absence of user contact with the device 200, the orientation or acceleration/deceleration of the device 200, and the temperature change of the device 200. The sensor assembly 214 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 214 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 214 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 216 is configured to facilitate wired or wireless communication between the device 200 and other devices. The device 200 can access a wireless network based on a communication standard, such as WiFi, 4G or 5G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, the apparatus 200 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above method.

In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 204 including instructions, and the instructions can be executed by the processor 220 of the device 200 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims (10)

1. A color temperature calibration method, characterized in that it is applied to a terminal, wherein the terminal includes an under-screen color temperature sensor, and the color temperature calibration method comprises: Get color temperature calibration data; Controlling the terminal to display at least one background picture under a preset test environment, and controlling the under-screen color temperature sensor to collect the color temperature of ambient light, to obtain at least one ambient color temperature collection value, wherein there is a one-to-one correspondence between the ambient color temperature collection value and the background picture; Based on the color temperature calibration data, color temperature calibration is performed on the at least one ambient color temperature acquisition value to obtain an ambient color temperature calibration value; Determining the accuracy of color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment; Wherein, determining the accuracy of color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment includes: If the difference between the ambient color temperature calibration value corresponding to each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is less than the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is accurate; If the difference between any ambient color temperature calibration value in each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is greater than or equal to the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate. 2. The color temperature calibration method according to claim 1, wherein the color temperature calibration data includes a screen color component, a screen brightness component, and an ambient light transmittance component, and is determined in the following manner: In a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, controlling the terminal to display a monochrome picture corresponding to a color channel at a maximum display brightness, and controlling the under-screen color temperature sensor to collect data, and using the data collected by the under-screen color temperature sensor when displaying the monochrome picture as a screen color component; In a dark room calibration environment where the ambient light brightness is lower than a brightness threshold, controlling the terminal to display a pure white picture at different display brightnesses, and controlling the under-screen color temperature sensor to collect data, and using the data collected by the under-screen color temperature sensor when displaying the pure white picture as a screen brightness component; In a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the terminal is controlled to turn off the screen, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component. 3. The color temperature calibration method according to claim 2, wherein the step of controlling the terminal to display at least one background image under a preset test environment comprises: Controlling the terminal to display at least one background image under a test environment provided by a test light box; The test light box has the same color temperature as the calibration light box, but a different ambient light brightness. 4. The color temperature calibration method according to any one of claims 1 to 3, characterized in that displaying at least one background picture comprises: A corresponding background image group is displayed for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with brightness higher than a first brightness threshold in the color corresponding to the color channel, and a second background image with brightness lower than a second brightness threshold, and the first brightness threshold is greater than the second brightness threshold. 5. A color temperature calibration device, characterized in that it is applied to a terminal, wherein the terminal includes an under-screen color temperature sensor, and the color temperature calibration device includes: An acquisition unit, used for acquiring color temperature calibration data; A control unit, used to control the terminal to display at least one background picture under a preset test environment, and control the under-screen color temperature sensor to collect the color temperature of ambient light to obtain at least one ambient color temperature collection value, wherein there is a one-to-one correspondence between the ambient color temperature collection value and the background picture; A calibration unit, configured to perform color temperature calibration on the at least one ambient color temperature acquisition value based on the color temperature calibration data to obtain an ambient color temperature calibration value; a determining unit, configured to determine the accuracy of color temperature calibration based on the color temperature calibration data based on the environmental color temperature calibration value and the actual environmental color temperature value under the test environment; The determining unit is used to determine the accuracy of color temperature calibration based on the color temperature calibration data based on the ambient color temperature calibration value and the actual ambient color temperature value under the test environment in the following manner: If the difference between the ambient color temperature calibration value corresponding to each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is less than the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is accurate; If the difference between any ambient color temperature calibration value in each background image in the background image group corresponding to each color channel in all color channels and the actual ambient color temperature value under the test environment is greater than or equal to the color temperature threshold, it is determined that the color temperature calibration based on the color temperature calibration data is inaccurate. 6. The color temperature calibration device according to claim 5, characterized in that the color temperature calibration data includes a screen color component, a screen brightness component and an ambient light transmittance component, and is determined in the following manner: In a darkroom calibration environment where the ambient light brightness is lower than a brightness threshold, controlling the terminal to display a monochrome picture corresponding to a color channel at a maximum display brightness, and controlling the under-screen color temperature sensor to collect data, and using the data collected by the under-screen color temperature sensor when displaying the monochrome picture as a screen color component; In a dark room calibration environment where the ambient light brightness is lower than a brightness threshold, controlling the terminal to display a pure white picture at different display brightnesses, and controlling the under-screen color temperature sensor to collect data, and using the data collected by the under-screen color temperature sensor when displaying the pure white picture as a screen brightness component; In a calibration environment provided by a calibration light box with fixed ambient light brightness and color temperature, the terminal is controlled to turn off the screen, and the under-screen color temperature sensor is controlled to collect data, and the data collected by the under-screen color temperature sensor when the screen is turned off is used as the ambient light transmittance component. 7. The color temperature calibration device according to claim 6, wherein the control unit is used to: Controlling the terminal to display at least one background image under a test environment provided by a test light box; The test light box has the same color temperature as the calibration light box, but a different ambient light brightness. 8. The color temperature calibration device according to any one of claims 5 to 7, characterized in that the control unit is used to: A corresponding background image group is displayed for each color channel in all color channels, wherein the background image group corresponding to each color channel includes a first background image with brightness higher than a first brightness threshold in the color corresponding to the color channel, and a second background image with brightness lower than a second brightness threshold, and the first brightness threshold is greater than the second brightness threshold. 9. A color temperature calibration device, comprising: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to execute the color temperature calibration method described in any one of claims 1 to 4. 10. A non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute the color temperature calibration method according to any one of claims 1 to 4.