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WO2005112429A1 - Dispositif de correction de couleur, méthode de correction des couleurs et méthode d'affichage de la correction des couleurs - Google Patents

Dispositif de correction de couleur, méthode de correction des couleurs et méthode d'affichage de la correction des couleurs Download PDF

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Publication number
WO2005112429A1
WO2005112429A1 PCT/JP2005/009220 JP2005009220W WO2005112429A1 WO 2005112429 A1 WO2005112429 A1 WO 2005112429A1 JP 2005009220 W JP2005009220 W JP 2005009220W WO 2005112429 A1 WO2005112429 A1 WO 2005112429A1
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WO
WIPO (PCT)
Prior art keywords
color difference
difference signal
color
signal
axis
Prior art date
Application number
PCT/JP2005/009220
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English (en)
Japanese (ja)
Inventor
Kenichiro Waki
Takashi Masuda
Kenji Kobayashi
Tsutomu Okuno
Takashi Kurino
Original Assignee
Acutelogic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Acutelogic Corporation filed Critical Acutelogic Corporation
Priority to JP2006513638A priority Critical patent/JPWO2005112429A1/ja
Publication of WO2005112429A1 publication Critical patent/WO2005112429A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6002—Corrections within particular colour systems
    • H04N1/6005—Corrections within particular colour systems with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6075—Corrections to the hue

Definitions

  • Color correction device color correction method, and color correction display method
  • the present invention relates to a color correction method and a color correction display method for performing color correction of an image signal.
  • a color correction device that performs color correction of the image signal in order to improve color reproducibility.
  • This type of color correction device that is used includes a color correction device that performs color correction on an RGB signal that expresses a color using a combination of red (R), green (G), and blue (B) light-primary colors. And color correction for color difference signals separated from RGB signals.
  • FIG. 19 is a diagram showing the configuration of the former evening color correction device. As shown in Fig. 19, the color correction device of this type has an RGB matrix converter 1
  • the color correction device in this evening inputs RGB signals (R, G, B) and finds the product of the signals with the 3X3 conversion matrix to obtain the converted values.
  • RGB signal is obtained (R'G ', B').
  • RGB signal is obtained (R'G ', B').
  • the respective coefficients C 11 to C 33 of the conversion matrix are determined in order to correct a certain color, the conversion matrix affects other colors, and Color correction is performed. As a result, overall color reproduction is often undesirable.
  • the luminance may change, which is not desirable for color conversion.
  • FIG. 20 is a block diagram showing the configuration of the latter evening color correction device. As shown in FIG. 20, this type of color correction device includes a luminance / color difference signal separation unit 101 , Chrominance signal matrix conversion unit 102, luminance / chrominance signal synthesis unit 10
  • the luminance / chrominance signal separation unit 101 separates the input image signal into a luminance signal (Y) and color difference signals (Cb, Cr) and outputs them.
  • the chrominance matrix conversion unit 102 receives the chrominance signals (Cb, Cr) separated by the luminance / chrominance signal separation unit 101, and receives the chrominance signals (Cb, Cr). By performing color difference matrix conversion, the converted color difference signal
  • the luminance and chrominance signal synthesizing unit 103 includes a chrominance signal (Cb ′, Cr ′) after color conversion corrected by the chrominance matrix conversion unit 102 and a luminance and chrominance signal separation unit
  • the image signal is generated by combining the luminance signal (Y) separated in step 1 and output to the outside.
  • the input image signal is separated into the luminance signal (Y) and the color difference signals (Cb, Cr), and the color difference signals (Cb, Cr) are separated.
  • Y luminance signal
  • Cb, Cr color difference signals
  • Cb, Cr color difference signals
  • the axes C y (X) of Y e (yellow) and B (blue) The hue range is divided into six regions by the axes Mg (magenta) and G (green) of R and R (red), and the input color difference signal (B—YR
  • This color correction circuit performs a first-order conversion on each of the above-described vector components according to a predetermined conversion matrix, and calculates a color difference based on each of the first-ordered vector components and a coefficient of each of the vector components.
  • the signal ( ⁇ — ⁇ , R— ⁇ ) is converted. According to this conventional technique, color correction can be performed only on a color difference signal within a predetermined area.
  • Patent Document 1 has a problem that the degree of freedom of the v. Region division is reduced because the predetermined region is divided by a straight line passing through the origin (the origin is not the starting point).
  • color correction is performed only on the color difference signal in a predetermined area, if color correction is performed in a certain area, continuity with colors in other areas is not maintained. In order to maintain color continuity with respect to other areas, it is necessary to adjust the glitter after trial and error in other areas other than the area where color correction is performed. It was very troublesome.
  • the present invention has been made in order to solve such a problem, and it is possible to reduce the influence on other colors by correcting a desired color, and to improve the color difference signal space.
  • the purpose is to maintain color continuity at the boundaries of the axes. Disclosure of the invention
  • the color correction device of the present invention receives a separated color difference signal and determines where the color difference signal exists in a plurality of regions divided by the axis of the number of pixels starting from the origin of the color difference signal space and the color difference signal space. Then, the color # 1 is converted using the conversion matrix corresponding to the determined area.
  • the transformation matrix is configured as a matrix having, as elements, a coefficient for independently expanding and contracting a plurality of axes and a rotation angle for independently rotating the plurality of axes.
  • the separated color difference signal is gamma-converted based on a predetermined gamma curve, and the gamma conversion is performed anywhere in a plurality of regions divided by a plurality of axes starting from the origin of the color difference signal space. It is determined whether or not the converted color difference signal exists, and the gamma-converted color signal is converted using a conversion matrix corresponding to the determined area.
  • the transformation matrix is configured as a matrix having rotation angles for rotating a plurality of axes independently as elements.
  • the color difference signal has a first-order term and a second-order term, and the coefficients are a first-order coefficient for the first-order term and a first-order coefficient for the second-order term. It is characterized by having
  • a plurality of axes in the color difference signal space are That is, even if one axis or both axes of the area where the color difference signal for performing color correction exists is rotated and expanded / contracted, the other axes are independently rotated and expanded / contracted so that the influence on other colors is reduced. Since the color can be corrected, it is possible to reduce the influence on other colors when the desired color is corrected.
  • the colors on both sides of the axes are converted following the rotation of the axes, so there is no need to set parameters such as the coefficients of the conversion matrix and the rotation angle. Therefore, the color continuity at the axis boundary can be easily maintained.
  • Color correction with a high degree of freedom can be performed, and color reproducibility can be improved.
  • the color difference signal is gamma-converted based on a predetermined gamma curve and then converted by a conversion matrix, it is possible to apply a gain to the color difference signal by gamma conversion. it can.
  • the magnitude of the gain can be made variable according to the magnitude of the original color difference signal.
  • the coefficients used in the transformation matrix have a first-order coefficient and a second-order coefficient, the degree of freedom for setting the coefficients is increased. .
  • FIG. 1 is a block diagram illustrating a configuration example of a color correction device according to the first embodiment.
  • FIG. 2 is a flowchart showing the operation and color correction method of the color correction device according to the first embodiment.
  • FIG. 3 is a diagram illustrating an example of four-axis conversion by the color correction device according to the first embodiment.
  • FIG. 4 is a diagram illustrating another example of four-axis conversion by the color correction device according to the first embodiment.
  • FIG. 5 is a diagram illustrating an example of a screen of a thread for calculating a primary coefficient and a rotation angle of a conversion matrix in the color correction device according to the first embodiment.
  • FIG. 6 is a block diagram illustrating a configuration example of a color correction device according to the second embodiment.
  • FIG. 7 is a diagram illustrating an example of a graph used for chroma gamma conversion by the color correction device according to the second embodiment.
  • FIG. 8 is a diagram illustrating an example of four-axis conversion by the color correction device according to the second embodiment.
  • FIG. 9 is a diagram illustrating another example of a graph used for chroma gamma conversion by the color correction device of the second embodiment.
  • FIG. 10 is a block diagram illustrating a configuration example of a color correction device according to the third embodiment.
  • FIG. 11 is a diagram illustrating an example of four-axis conversion by the color correction device according to the third embodiment.
  • FIG. 12 is a diagram comparing an example of four-axis conversion by the color correction device of the third embodiment with an example of four-axis conversion by the color correction device of the first embodiment.
  • FIG. 13 is a block diagram illustrating a configuration example of a color correction device according to the fourth embodiment.
  • m 14 is a diagram illustrating an example of 8-axis conversion by the color correction device according to the fourth embodiment.
  • FIG. 15 is a diagram illustrating a modification of the axis alignment performed by the color correction device according to the fourth embodiment.
  • FIG. 16 is a diagram illustrating an example of a screen of a tool for calculating a primary coefficient, a secondary coefficient, and a rotation angle of a conversion matrix for adding an axis in the color correction apparatus according to the fourth embodiment.
  • FIG. 17 is a diagram illustrating an example in which axes are freely arranged in the color correction device according to the fourth embodiment.
  • FIG. 18 is a block diagram showing a configuration example of a color correction device according to the fifth embodiment.
  • FIG. 19 is a block diagram showing a configuration example of a conventional color correction device.
  • FIG. 20 is a block diagram showing another configuration example of a conventional color correction device.
  • Figure 21 shows the equation that also converts RGB 1s with the conventional color correction m. It is a figure
  • FIG. 22 is a diagram showing an equation for converting a color difference signal of the color correction device according to the first embodiment.
  • 23 is a diagram illustrating an expression of a conversion matrix according to the coordinates of the color difference signal of the color correction according to the first embodiment.
  • 24 is a diagram showing an equation for calculating the sum of differences between conversions of a plurality of color difference signals of the color correction device according to the first embodiment.
  • FIG. 25 is a diagram showing an expression of a conversion matrix when performing gamma conversion of color correction according to the second embodiment.
  • FIG. 26 is a diagram illustrating a formula for converting a color difference signal including a quadratic term of color correction according to the third embodiment and a conversion matrix formula for coordinates of the color difference signal.
  • FIG. 27 is a diagram illustrating an equation for converting a color difference signal when performing eight-axis conversion of the color correction device according to the fourth embodiment.
  • FIG. 28 is a diagram showing an equation for converting a color difference signal when the positions of the axes of the color correction device according to the fourth embodiment are freely arranged.
  • FIG. 29 is a diagram illustrating an example of a matrix of an RGB matrix conversion unit of the color correction device according to the fifth embodiment.
  • FIG. 30 is a diagram illustrating three matrices for obtaining a first transformation matrix of the color correction device according to the fifth embodiment.
  • FIG. 31 is a diagram showing a matrix for converting a color difference signal of the color correction device according to the fifth embodiment.
  • FIG. 32 is a diagram showing an expression for obtaining a first transformation matrix of the color correction device according to the fifth embodiment.
  • FIG. 33 is a diagram illustrating two matrices for obtaining a second conversion matrix of the color correction device according to the fifth embodiment.
  • FIG. 34 is a diagram showing an expression for obtaining a second transformation matrix of the color correction device according to the fifth embodiment.
  • FIG. 1 is a block diagram illustrating a configuration example of a color correction apparatus according to a first embodiment.
  • reference numeral 1 denotes a luminance / chrominance signal separation unit, which separates an input image signal into a luminance signal (Y) and color difference signals (Cb, Cr) and outputs them.
  • Reference numeral 2 denotes a four-axis conversion unit (corresponding to the axis conversion unit in the claims), to which the color difference signals (Cb, Cr) separated by the luminance color difference signal separation unit 1 are input. And the Cb component of the color difference signal (cbCr) is the X axis, and the Cr component is
  • the color difference signal space on the Y axis it is determined which quadrant (any one of the first to fourth quadrants) the coordinates of the color difference signal (C b, Cr) are included in.
  • the color difference signal (C b, C r) are color-corrected, and the converted color difference signals (C b ′, C r ′) are obtained.
  • Reference numeral 3 denotes a luminance / chrominance signal synthesizing unit, which converts the color difference signals (C b ′, Cr ′) after the color correction by the 4-axis conversion unit 2 and the luminance signal ( ⁇ ) separated by the luminance / chrominance signal separation unit 1 To generate an image signal and output it to the outside.
  • the color difference signal space described above is based on the Cb axis for the positive direction of the color difference signal (Cb).
  • the area is divided, and the area between the Cb axis and the Cr axis is in the first quadrant, the area between the Cr and Cb axes is the second quadrant, the Cb-axis and the Cr axis The area between them is the third quadrant, and the area between the Cr single axis and the C b axis is the fourth quadrant
  • the quadrant that contains the coordinates of the color difference signal (C b, Cr) is determined by the color difference ie
  • the color difference signals (C b, C r) are in the third quadrant.
  • the color difference signal (C b) is positive and the color difference signal (C r) is negative (represented as C r 1)
  • the color difference signal (C b, C r) is present in the fourth quadrant. If the coordinates of (C b, C r) exist in the first quadrant, 3 Perform color correction using the transformation matrix C shown in (a). If the coordinates of the color difference signals (C b, C r) exist in the second quadrant, color correction is performed using the conversion matrix C 2 shown in FIG. 23 (b).
  • FIG. 2 is a flowchart showing an operation of the color correction apparatus according to the first embodiment and a color correction method.
  • the luminance signal (Y) and the color difference signals (Cb, Cr) are separated by the luminance / chrominance signal separation section 1 (step S1).
  • the luminance signal (Y) separated by the luminance and chrominance signal separation unit 1 is output to the luminance and chrominance signal synthesis unit 3, and the chrominance signal (C b C r) separated by the luminance and chrominance signal separation unit 4 is Output to axis conversion unit 2.
  • the luminance and chrominance signal separation unit 1 outputs the chrominance signals (Cb, Cr
  • Step S 4 Is input to check which quadrant in the chrominance signal space exists (step S 2). Then, the color difference signals (C b, C r) are converted by using a conversion matrix corresponding to the quadrant (step S 3).
  • the four-axis converter 2 outputs the converted color difference signals (C b ′, Cr ⁇ ) to the luminance / color difference signal synthesizer 3.
  • the luminance / chrominance signal synthesizing unit 3 synthesizes the luminance signal (Y) input from the luminance / chrominance signal separating unit 1 and the converted color difference signals (C b ′, C r ′) input from the 4-axis conversion unit 2.
  • Step S4 To generate an image signal and output it to the outside (Step S4
  • FIG. 3 is a diagram illustrating an example of four-axis conversion by the color correction device according to the first embodiment.
  • the color difference signal space is divided by four axes of Cb axis, Cr axis, Cb-axis, and Cr-axis.
  • the axis obtained by rotating the C b axis by a predetermined rotation angle and setting the gain to a primary coefficient of 1! Is the C b 'axis. Further, by rotating the C r axis by a predetermined rotation angle 0 2, the axis in which the gain as the primary factor 1 2, and C r 'axis.
  • C b - by rotating the shaft by a predetermined rotation angle theta 3, the axis of the primary coefficient 1 3 gain is, C b '- the axis Moreover, C r uniaxial a predetermined rotation angle 0 4 The axis rotated by only the first and the gain is set to the primary coefficient 1 is C r 'one axis.
  • C r -axis are independently rotated and expanded / contracted to obtain the input color difference signal.
  • the coordinates of the color difference signal (Cb, Cr) input to the 4-axis conversion unit 2 in the color difference signal space are Q (R, P).
  • the input color difference signal (Cbr) Is represented by a vector from the origin of the color difference signal space to the coordinates Q (R, P). Since the color difference signal (C b, C r) exists in a region surrounded by one axis of C b where the color difference signal (C b) is negative and the Cr axis where the color difference signal (C r) is positive.
  • the four-axis conversion unit 2 determines that the color difference signal (Cb, Cr) exists in the second quadrant.
  • the 4-axis conversion unit 2 determines that the color difference signal (Cb, Cr) exists in the second quadrant.
  • the vector T of the color difference signal (C b ', C r') is defined by two lines: a line on the C b 'axis from the origin to the point U and a line on the C r' axis from the origin to the point S. It is represented by the diagonal of a parallelogram generated as
  • the area composed of the four axes (C b '-axis, C b' -axis, C r '-axis, and C r' -axis) converted by the four-axis conversion unit 2 is newly added. Quadrant.
  • the area consisting of the C b 'and C r' axes is the new first quadrant
  • the area consisting of the C r 'and C b' — axes is the new second quadrant
  • the area consisting of the axis and the C r '— axis is the new third quadrant
  • the area consisting of the C r' — axis and the C b 'axis is the new fourth quadrant.
  • the force 3 ′ rotating all four axes is not limited to this.
  • the chrominance signal space is divided by four axes: Cb axis, Cr axis, Cb-axis, and Cr axis.
  • Rotate the C r axis by a predetermined rotation angle 0 2 the axis of the primary coefficient 1 2 gain becomes C r 'axis.
  • the C b axis and the C r — axis are not rotated and the gain is set to 0, so that the C b ′ axis and the C r ′ axis coincide with the C b axis and the C r axis, respectively.
  • the coordinates of the color difference signal (Cb, Cr) input to the 4-axis conversion unit 2 in the color difference signal space are Q (R, P).
  • the color difference signal (C b, C r) exists in the area surrounded by the C b — axis where the color difference signal (C b) is negative and the r axis where the color difference signal (C r) is positive.
  • the four-axis converter 2 determines that the color difference signals (C b, C r) exist in the second quadrant.
  • 4 axis conversion portion 2 depending on the result, performs a conversion using the conversion matrix C 2 of the formula 3 described above.
  • point R is converted to point U and point P is converted to point S.
  • the vector T of the converted color difference signal (C b ′, C r ′) is , Expressed by the diagonal of a parallelogram generated with the line on the C b axis from the origin to the point U and the line on the C r 'axis from the origin to the point S as one side, where 4 axes Assume that the coordinates of the color difference signals (C b, C r) input to the conversion unit 2 in the color difference signal space are B.
  • the color difference signal (C b, C r) exists in an area surrounded by the C b axis where the color difference signal (C b) is positive and the C r axis where the color difference signal (C r) is negative.
  • the four-axis conversion unit 2 determines that the color difference signals (Cb, Cr) exist in the fourth quadrant.
  • the 4-axis conversion unit 2 since the Cb axis and the Cr single axis do not rotate and the gain is 0, the coordinate C of the converted color difference signal (Cb ⁇ ', Cr-) is converted. It is the same as the coordinate B of the previous color difference signal (C b, C r). In this way, by not rotating all four axes, it is possible to perform color correction without giving any shadow m to the color of the quadrant constituted by the axes that are not rotated.
  • FIG. 5 is a diagram showing an example of a screen of a tool for calculating a rotation angle and a gain of a transformation matrix in the color correction apparatus according to the first embodiment.
  • the tool screen includes a first display area 11, a second display area 12, a coefficient rotation angle input area 13, and a color difference signal comparison area 1.
  • the first display area 11 1 displays an image before color correction is performed.
  • the second display area 12 displays an image after color correction.
  • the conversion matrix display area 15 displays the value of a conversion matrix (expression shown in FIG. 23) determined according to the primary coefficient and the rotation angle input in the coefficient rotation angle input area 13.
  • the user selects a position (point A) in the image displayed on the first display area 11 for performing color correction using an operating device such as a mouse.
  • the color difference signal comparison area 14 displays the point A in the image displayed on the first display area 11. Displays the coordinate B of the corresponding color difference signal (Cb, Cr)
  • the user confirms that the coordinate B exists in the second quadrant between the C r axis and the C b — axis.
  • the input unit on the C r axis of the coefficient rotation angle input area 13 Enter the primary coefficient 1 2 and the rotation angle ⁇ 2 in 13 b.
  • the user operates the calculation execution button 16.
  • the tools, the second transformation matrix used in quadrant relative to (2 3 (formulas described b)) one entered order coefficient 1 2 and the rotation angle 0 2 and the product of the color difference signals (C b, C r) is calculated by the equation shown in FIG. Ask.
  • the color difference signal comparison area 14 displays the coordinates C of the converted color difference signals (C b ′, C r ′) after color correction, and the conversion matrix display area 15 inputs the coordinates C to the input section 13 b.
  • the value of the transformation matrix is calculated Me is displayed by the primary factor 1 2 and the rotation angle are two values were. Further, the image after the color correction is displayed in the second display area 12.
  • the user can adjust the color-corrected image displayed in the second display area 12, the coordinate B of the color-difference signal (C b, C r) displayed in the color-difference signal comparison area 14, the converted color difference Look at the coordinates C of the signals (C b ', C r') and the values of the conversion matrix displayed in the conversion matrix display area 15, and look at the coefficient 12 and the rotation angle input to the input section 13 b. 0 2 values can be confirmed whether or not appropriate. Then, if inappropriate, re-enter the rotation angle and gain to make adjustments.
  • the rotation angle and the gain of the transformation matrix are obtained by inputting a numerical value into the coefficient rotation angle input area 13, but the present invention is not limited to this.
  • the color difference signal space is displayed in the coefficient rotation angle input area 13 and axes in the color difference signal space (Cb-axis, Cr-axis, Cb-axis, Cr-axis) are displayed using an operating device such as a mouse. ) May be directly rotated or expanded or contracted.
  • the i-th color difference signal (C bi, C ri) (i Is an integer greater than or equal to 1).
  • Color difference signals (C b, Cr) before color correction for example, the color west where the spectral reflection characteristics of the color filters, etc., are separated is known. It is possible to use signals obtained by imaging
  • the four axes (Cb axis, Cb-axis Cr axis, and Cr single axis) in the color difference signal space are independently rotated and expanded / contracted. Shift the coordinate point of the input color difference signal (CbCr).
  • FIG. 6 is a block diagram illustrating a configuration example of a color correction device according to the second embodiment.
  • reference numeral 21 denotes a luminance / chrominance signal separation unit, which receives an input image signal.
  • the luminance signal (Y) and the color difference signals (Cb, Cr) are separated and output.
  • Reference numeral 22 denotes a clogan conversion unit which receives the color difference signals (Cb, Cr) separated by the luminance / color separation unit 21 and outputs the color difference signals (Cb, Cr).
  • the gamma force is represented, for example, by a graph shown in FIG.
  • the color difference signal (C b) is converted into a color difference signal (C b
  • the color difference signal (Cr) is converted into a color difference signal (Cr '") after gamma conversion by a gamma curve G2.
  • the gain of the color difference signals (Cb, Cr) is obtained from the gamma curves Gl, G2.
  • the gamma curves G l and G 2 can be freely set using tools and the like.
  • Reference numeral 23 denotes a four-axis conversion unit which receives the gamma-converted color difference signal (Cb'Cr) converted by the chroma gamma conversion unit 22 and whose coordinates correspond to which quadrant (color space) in the color-difference signal space. It determines whether it is included in any of the first to fourth quadrants), and calculates the product of the conversion matrix determined according to this and the color difference signals (C b '', C r '') after gamma conversion Thus, the converted color difference signals (C b ′, C r ′) obtained by color correction of the color difference signals (C b, C r) are obtained.
  • color correction is performed using the conversion matrix C i shown in Fig. 25 (a). .
  • the coordinates of the color difference signals (C b '', C r '') after gamma conversion are When present in limited performs by Ri color correction conversion matrix C 2 shown in FIG. 2 5 (b).
  • color correction is performed using the conversion matrix C 3 shown in Fig. 25 (c).
  • color correction is performed using the conversion matrix C4 shown in Fig. 25 (d).
  • Reference numeral 24 denotes a luminance / chrominance signal component, which is separated by the luminance / chrominance signal separation unit 21 from the converted color difference signal (CbCr ') subjected to color correction by the 4-axis conversion unit 23.
  • the image signal is generated by combining the obtained luminance signal (Y) and, and output to the outside.
  • FIG. 8 is a diagram illustrating an example of four-axis conversion by the color correction device according to the second embodiment.
  • the color difference signal (CbCr) existing at the coordinate Q in the second quadrant and the color difference signal (CbCr) existing at the coordinate B in the fourth quadrant are converted.
  • G 2 is set so that the Cr component of the color difference signal is equal to the Cr ′ ′ component of the color difference signal after gamma conversion.
  • the color difference signal (C b ) (C b )
  • the four-axis conversion unit 23 performs color correction using a conversion matrix corresponding to the quadrant where the color difference signal after the gamma conversion exists. That is, the color difference signals (C b C r) of the coordinates Q are gamma-converted and the color difference signals (C b ′, C r ′) are converted to the conversion matrix C 2 shown in FIG. 25 (b).
  • the color difference signal (C b, Cr) obtained by gamma-converting the color difference signal (C b, Cr) at coordinate B is converted as shown in Fig. 25 (d). perform by Ri color correction matrix C 4.
  • C r ′ becomes T
  • the coordinates of the color 3 ⁇ 4i Is->, C b 1, cr ′) obtained by converting the color difference signal (C b, C r) at coordinate B become C.
  • the green color of the coordinate B can be increased while maintaining the saturation. The color can be corrected to the coordinates C.
  • the color difference signals (C b, Cr) are converted by the gun force G 1, G 2, and the color difference signals (gamma converted) C b '' .. C r '') is converted to 4-axis, so the color difference signal (C b
  • the size of the gain can be varied according to the size of (C b, C r). This makes it possible to apply gain to the color difference signals (Cb, Cr) in the same area unevenly. Therefore, the color difference signal in the same area
  • FIG. 10 is a block diagram illustrating a configuration example of a color correction device according to the third embodiment.
  • reference numeral 31 denotes a luminance / chrominance signal separation unit, which receives an input image.
  • the luminance signal (Y) and the color difference signals (Cb, Cr) are separated from the signal and output.
  • Reference numeral 3 2 denotes a four-axis conversion unit which receives the color difference signals (C b, C r) separated by the luminance / color difference signal separation unit 31 and converts the color difference signals (C b, C r) into two.
  • a color difference signal (Cb, Cr, Cb2, Cr2) containing the following terms is generated.
  • C b 2 C b ′ (
  • ), and C r 2 C r ⁇ (IC b I + IC r I).
  • the 4-axis conversion unit 32 determines which quadrant (any one of the first to fourth quadrants) in the color difference signal space includes the coordinates of the input color difference signal (C b, Cr).
  • color correction is performed using the conversion matrix C i shown in FIG. 26 (b).
  • the coordinates of the color difference signals (C b 'CV) is when present in the second quadrant performs color correction by conversion matrix C 2 shown in FIG. 2 6 (c).
  • color correction is performed using the conversion matrix C 3 shown in FIG. 26 (d), and the color difference signal (C b, C r) If the coordinates are present in the fourth quadrant of) performing color correction by the transformation matrix C 4 shown in FIG. 2 6 (e).
  • Reference numeral 3 denotes a luminance / chrominance signal synthesizing unit, which is separated by the luminance / chrominance signal separating unit 3 1 from the converted color difference signals (C b ′, Cr ′), which have been color-corrected by the 4-axis conversion unit 3 2.
  • the image signal is generated by combining the luminance signal (Y) and output to the outside.
  • the color difference signal space is divided by four axes: Cb axis, Cr axis, Cb-axis, and Cr-axis.
  • the axis in which the C b axis is rotated by a predetermined rotation angle ⁇ i, and the gain is represented by the primary coefficient 1 and the secondary coefficient is the C b ′ axis. Further, by rotating the C r axis by a predetermined rotation angle 0 2, the axis of the the gain as the primary factor 1 2 and the secondary coefficient m 2 is a C r 'axis.
  • C b - by rotating the shaft by a predetermined rotational angle theta 3 is the axis of the primary factors 1 3 and the secondary coefficient m 3 a gain, C b '- the axis.
  • C r - by rotating the shaft by a predetermined rotational angle theta 4 is the axis of the the gain as the primary coefficient of 1 4 and the secondary coefficient m 4 is, C r '- the axis.
  • the four-axis conversion unit 32 independently rotates and expands and contracts the four axes (Cb axis, Cb-axis, Cr axis, and Cr single axis) as described above, so that the input color difference signal (C b, C r).
  • the coordinates of the color difference signals (C b, C r) input to the four-axis conversion unit 32 in the color difference signal space are Q (R, P). That is, the input color difference signal (C b, C r) is represented by a vector from the origin of the color difference signal space to the coordinate Q (R, P).
  • the vector representing the input color difference signal (C b, C r) is a rectangle formed by the line on the C b axis from the origin to the point R and the line on the Cr axis from the origin to the point P. It is represented by the diagonal of.
  • This input color difference signal (C b, C r) exists in the area surrounded by the C b -axis where the color difference signal (C b) is negative and the Cr axis where the color difference signal (C r) is positive. Therefore, the four-axis conversion unit 32 determines that the color difference signals (C b, C r) exist in the second quadrant. In accordance with this result, the 4-axis conversion unit 32 uses the conversion matrix C 2 expressed by the above-described equation shown in FIG. 6 Conversion is performed using the equation shown in (a).
  • the converted color difference signal (Cb'Cr ') is divided into a line from the origin on the Cb'-axis to point U and a line from the origin on the Cr' axis to point S on the Cr 'axis. It is represented by the vector up to the coordinate T 'on the extension of the diagonal line (the vector from the origin to the coordinate T) of the parallelogram generated as two sides. Note that vector from the origin to the coordinates T is the first Ri by the color correction device of the embodiment color-corrected base-vector of the color difference signal using only the primary coefficient 1 2 1 3.
  • the color difference signal (C b, C r) is converted into a form (C b, C r, C b 2, C r 2) including a quadratic term To the EiX Ah of the 5 ⁇ -coefficient, since color correction is performed by calculating the product of the conversion matrix with the primary coefficient (lil 4 ) and the secondary coefficient (ni im A).
  • the degree of freedom increases. In other words, it is possible to set a coefficient so that the gain increases as the distance from the origin increases, and to set a coefficient such that the gain decreases as the distance increases from the origin. For example, when performing yellow color correction, the saturation of yellow is increased.
  • reference numeral 41 denotes a luminance / color signal separation unit, which is a part of the luminance / color signal separation unit.
  • Reference numeral 42 denotes an 8-axis conversion unit (corresponding to the axis conversion unit in the claims), which converts the color difference signals (C b, Cr) separated by the luminance / color difference signal separation unit 41, A color difference signal (C b, C r, C b 2, C r 2) including a quadratic term is generated. Also, the 8-axis conversion unit 42 determines in which area the coordinates of the input color-difference signal (Cb, Cr) are present in the color-difference signal space in which the area is equally divided by the eight axes. Then, a transformation matrix c n (n is an integer of 1 to 8) determined according to this and a color difference signal (C b, C r, C
  • Reference numeral 43 denotes a luminance / chrominance signal synthesizing unit D.
  • the luminance / chrominance signal separating unit 41 converts the color difference signals (Cb ', Cr'), which have undergone color correction by the 8-axis conversion unit 42, and the luminance / chrominance signal separation unit 41.
  • FIG. 14 is a diagram illustrating an example of 8-axis conversion by the color correction device according to the fourth embodiment.
  • the color difference signal space is
  • an axis obtained by rotating the axis by a predetermined rotation angle ⁇ i and setting the gain to a ⁇ first order 1 i and a second order coefficient mi is the C b ′ axis.
  • the vector V of (C b, C r) is a parallelogram formed by a line from the origin on the C b axis of the color-difference signal space to the point W on the W axis and a line from the origin on the K axis to the point X. Is represented by a diagonal line.
  • the color difference signals (C b, C r) are represented by a diagonal line.
  • the vector V in (1) is a pair of parallelograms generated with two lines, the line from the origin on the C b 'axis to the W — point and the line from the origin on the K' axis to the X 'point.
  • the W 'point on the Cb' axis is represented by an angle
  • the W point is converted by rotating the Cb axis by ⁇ and expanding and contracting by the primary coefficient 1i and the secondary coefficient mi.
  • point 'X on the axis' are those the K rotates the K axis by theta 2, it is obtained by converting the X point by stretching the primary factor 1 2 and the secondary coefficient m 2.
  • the color signal space is divided into eight axes and the conversion is performed, finer color correction can be performed. Further, for example, a color difference signal (CbCr) existing between the Cb axis and the ⁇ axis.
  • CbCr color difference signal
  • Color correction ⁇ , C b axis and K axis rotate and expand and contract, between C axis and L axis, between L axis and C b — axis, between C b — axis and M axis , M-axis and Cr-axis, Cr Color difference signal (Cb
  • the color difference signal space is represented by the Cb axis and the Cr axis.
  • It is composed of a total of 8 axes including the 4 axes of M axis and N axis, but is not limited to AE.For example, 12 axes, 16 axes, etc.
  • the region of the color difference signal space may be divided.
  • the positions of the axes in the color difference signal space may be freely arranged without being determined in advance.
  • the E axis rotated by the rotation angle from the Cb axis and the F axis rotated by the rotation angle 1 from the C axis are provided, and the E axis is only ⁇ ⁇ . rotate, respectively co ⁇ rotate the F axis by theta 2 - is the next coefficient 1, 1 by 2 and the secondary coefficient mm 2 so as to stretch the E-axis and F axis.
  • the input color signal (C b, C r) is converted to generate ⁇ 3 ⁇ 4 ⁇ 15 (C b, C r C b 2, C r 2) including the quadratic term, and
  • the converted color difference signals (C b ′, C r ′) are obtained by the equation shown in FIG.
  • the color signal (C b, C r) when converting a color difference signal (C b, C r) existing between the C b axis and the C r axis, the color signal (C b C r) must be located on the E axis or F axis. Then, the E-axis and the F-axis may be rotated and expanded / contracted. This makes it possible to directly correct the color difference signals (Cb, Cr) to be corrected by rotating and expanding and contracting the E-axis and F-axis. Therefore, color correction with a higher degree of freedom can be easily understood ⁇ easy to perform and color reproducibility can be improved.
  • the position of the axis in the color difference signal space can be freely determined without being determined in advance. And the number of areas divided by the axis is N (
  • N is an integer of 1 or more.
  • the axes may be set so that the outer product of adjacent coordinates is all larger than 0. For example, as shown in FIG. 17, assume that the number of divided areas is 5, and the axes that divide the areas are 0 axis, 1 axis, 2 axes, 3 axes, and 4 axes.
  • any coordinates on the 0 axis (AO x, A 0 y), any coordinates on the 1 axis (A 1 X, A 1 y), and any coordinates on the 2 axis (A 2 X, A 2 y ), Set arbitrary coordinates (A 3 X, A 3 y) on three axes, and set arbitrary coordinates (A 4 x, A 4 y) on four axes.
  • the axis conversion unit can determine in which area the coordinates of the color difference signal (Cb, Cr) exist.
  • the cross product of the coordinates of the color difference signal (Cb, Cr) and the coordinates on the 0 axis (AOx, A0y) is 0 or more, and the coordinates of the color difference signal (CbCr) If the cross product of the coordinates on the first axis and (A 1 X, A 1 y) is smaller than 0, the color difference signal (C b, C r) is the area between the 0 axis and the 1 axis. Is determined to exist.
  • the coordinates of the color difference signals (C b, Cr) and the coordinates on one axis (A 1 X, A 1 y) is 0 or more, and the coordinates of the color difference signals (C b, C r)
  • a 2 y is 0 or more, and the coordinates of the color difference signals (C b, C r)
  • a 3 y) is 0 or more, and the coordinates of the color difference signal (C b, C r)
  • the color difference signal (Cb, Cr) is considered to exist in the area between the three axes and the four axes. Judgment 1 9 First, the coordinates of the color difference signals (Cb, Cr) and the coordinates on four axes (A4X,
  • a 4 y) is greater than or equal to 0 and the coordinates of the color difference signals (C b, C r)
  • FIG. 16 is a diagram showing a screen example of a tool for calculating a rotation angle and a gain of a transformation matrix when adding an axis in the color correction apparatus according to the fourth embodiment.
  • FIG. Is is a diagram showing a screen example of a tool for calculating a rotation angle and a gain of a transformation matrix when adding an axis in the color correction apparatus according to the fourth embodiment.
  • First display area 11 First display area 11, second display area 12, coefficient rotation angle input area 17, color signal coordinate angle display area 18, axis addition button 19, color difference signal comparison area 14, a conversion matrix display error 15, and an operation execution button 16.
  • the first display area 11 displays an image before color correction is performed.
  • the second display layer 12 displays the image after color correction.
  • the coefficient rotation angle input area 17 has an axis number indicating the number of each axis in the color difference signal space and an area indicating the angle of each axis. Is the angle based on In the coefficient rotation angle input area 17, the primary coefficient (111) and the secondary coefficient (mlm4) indicating the gain for each axis of the color difference signal space, and the rotation of each axis are shown. Has an area for inputting a rotation angle (0104) indicating the angle to be set. Also, the axis of axis number 14 is an axis prepared in the initial state, and the axis of axis number 5 is , Added by the axis addition button 19. When an axis is added by operating the axis addition button 19, an area indicating the axis number and angle of the axis, and an area for inputting a primary coefficient, a secondary coefficient, and a rotation angle are added.
  • Angle display area 18 is the first display area 11 1t; the coordinates and origin of the color difference signal (CbCr) at point ⁇ in the displayed image are The angle of the connecting axis is displayed.
  • the axis addition button 19 is a button for adding the axis of the angle displayed in the color difference signal coordinate angle display area 18 as the axis of the color difference signal space.
  • the color difference signal comparison area 14 it is displayed that the color difference signal (C b, C r) corresponding to A in the image displayed in the first display area 11 exists at the coordinate B 0 ⁇
  • the color difference signal at point A (CbCr) is color corrected.
  • the transformation matrix display area 15 displays the value of the transformation matrix determined according to the rotation angle, the primary coefficient, and the secondary coefficient input in the coefficient rotation angle input area 17.
  • the user uses an operating device such as a mouse to Select the position (point A) in the image displayed in the first display area 11 where color correction is to be performed.
  • the color difference signal comparison area 14 displays the point A in the image displayed in the first display area 11.
  • the coordinates B of the color difference signal (Cb, Cr) corresponding to are displayed.
  • the color difference signal coordinate angle display area 18 the angle of the axis connecting the coordinates of the color difference signal corresponding to the point A in the image displayed in the first display area 11 and the origin is displayed. .
  • the user decides whether or not to add the axis of the angle displayed in the color difference signal coordinate angle display area 18 as an axis of the color difference signal space.
  • the axis addition button 19 To operate.
  • the coefficient rotation angle input area 17 shows the C b axis (axis number 1, angle 0 °, rotation angle 0 °) that originally exists.
  • Cr axis (axis number 2, angle 90 °, rotation angle 0 °, no primary and quadratic coefficients), Cb axis (axis number 3, angle 180 °, rotation angle 0 °, In addition to the four axes of primary axis (without primary and secondary coefficients), Cr and one axis (axis number 4, angle 270 °, rotation angle 0 °, no primary and secondary coefficients), axis number 5, angle A 120 ° axis is added. Then, the user inputs values of the rotation angle 0 5 , the primary coefficient 15 , and the secondary coefficient m 5 of the axis number 5 of the coefficient rotation angle input area 17 , and operates the calculation execution button 16.
  • the tool converts the values of the input rotation angle 0 5 , first-order coefficient 15 , and second-order coefficient m 5 to the transformation matrix used in the second quadrant by C
  • the product is calculated by taking into account the difference in angle from the r axis and the color difference signal.
  • the color difference signal comparison area 14 displays the coordinates C of the color-corrected color difference signals (C b ′, C r ′) after conversion.
  • the conversion matrix display area 15 displays the input rotation angle.
  • the value of the transformation matrix obtained from the values of 0 5 , primary coefficient 15 , and secondary coefficient m 5 is displayed.
  • the second display area 1 2 shows the image after color correction.
  • the user can adjust the coordinates B of the color-corrected image displayed in the second display area 12, the coordinates B of the color-difference signals (C b, C r) displayed in the color-difference signal comparison area 14, Look at the coordinates C of the color difference signals (C b ', C r') and the value of the conversion matrix displayed in the conversion matrix display area 15, and look at the rotation angle 0 input to the coefficient rotation angle input area 17. 5. It is possible to confirm whether the values of the primary coefficient 15 and the secondary coefficient ms are appropriate. If not, re-enter and make adjustments. In the fourth embodiment, a quadratic coefficient is used, but only a first-order coefficient may be used.
  • a gun conversion unit may be provided to perform conversion by gun force.
  • FIG. 8 is a block diagram illustrating a configuration example of a color correction device according to a fifth embodiment.
  • reference numeral 51 denotes an RGB matrix U / X conversion unit which receives an RGB signal (R, G, B) and calculates a product of the RGB signal and the 3 ⁇ 3 conversion matrix shown in FIG.
  • RGB signal R, G, B
  • a value predetermined by a parameter such as software for performing color correction is used.
  • Reference numeral 52 denotes a color difference signal extraction unit that extracts a color difference signal (Cb, Cr) corresponding to the first-order term from the input RGB signals (R ', G', B ') and outputs the signal.
  • the color difference signal extraction section 52 extracts a color difference signal (Cb2, Cr2) corresponding to a quadratic term from the RGB signal (R ', G', B ') and outputs the signal.
  • Reference numeral 53 denotes a first conversion matrix generation unit which receives a color difference signal (C b, C r) corresponding to a first-order term, and generates a first conversion matrix A based on this.
  • the first transformation matrix A is obtained by the product of the following three matrices.
  • the three matrices are used to convert the input converted RGB signals (R ', G', B ') to obtain a luminance signal (Y) and a color difference signal (Cb, Cr). queue
  • the third matrix is the inverse of the first matrix.
  • the area is divided by the axis.
  • the coordinates of the input color difference signals (C b, C r) are determined in which area, and a matrix determined accordingly (for example, FIG. 23 or FIG.
  • the matrix shown in 25 If the axes are freely arranged as shown in Fig. 15 without predetermining the positions of the axes in the color difference signal space, the second matrix is as shown in Fig. 31 (a). It becomes a matrix.
  • the first transformation matrix A By calculating the product of the first to third matrices (for example, the equation shown in FIG. 32), the first transformation matrix A is obtained.
  • the first transformation matrix A determines in which area the coordinates of the input color difference signal (C b, C r) exist in the color difference signal space in which the area is divided by the axis. It is a matrix that is determined and determined accordingly. Therefore, the first transformation matrix A exists for the number of regions.
  • Reference numeral 54 denotes a first image conversion unit, which is a matrix conversion RGB signal (R ′, G ′, B ′) input from the RGB matrix conversion unit 51 and a first conversion matrix A To obtain RGB signals (R ''',G''', B ''') converted from the first-order terms.
  • Reference numeral 55 denotes a second conversion matrix generation unit which inputs a color difference signal (C b 2, C r 2) corresponding to a quadratic term, and generates a second conversion matrix B based on this.
  • the second transformation matrix B is obtained by the product of the following two matrices.
  • the two matrices are used to transform the input color difference signals (C b 2, Cr 2) to obtain color corrected color difference signals (C b ′, Cr ′).
  • the fifth matrix for example, the matrix shown in Fig. 33 (b)
  • the fifth matrix is determined by parameters such as software for performing color correction.
  • the fourth matrix determines in which area the coordinates of the input color difference signal (C b 2, Cr 2) exist in the color difference signal space in which the area is divided by the axis. (For example, the matrix shown in Fig. 26). If the axes are freely arranged as shown in Fig. 15 without predetermining the positions of the axes in the color difference signal space, the fourth matrix is as shown in Fig. 30 (b). It becomes a matrix.
  • a second transformation matrix B is obtained.
  • the second transformation matrix B is based on the chrominance signal space in which the region is divided by the axis, and in which region the coordinates of the input chrominance signal (Cb2, Cr2) exist. It is a matrix determined according to this. Therefore, there are as many second transformation matrices B as the number of regions.
  • Reference numeral 56 denotes a second image conversion unit, and the second conversion matrix B input from the second conversion matrix generation unit 55 and the color difference signals (C b 2, C r 2) input from the color difference signal extraction unit 52 ) To obtain the RGB signal (R ''', G, B''') for transforming the quadratic term.
  • the second image converter 56 converts the first-order terms input from the first image converter 54. Color correction by adding the RGB signals (R '''', G '''' B '''-) for converting the quadratic terms to the RGB signals (R'''' GB ') Find RGB signal (RG ''',
  • the color reproducibility can be improved.
  • a conversion matrix for converting RGB signals R, GB
  • a unit matrix as a first conversion matrix A By using a zero matrix as the transformation matrix B of (2), RGB image signals can be output without color correction.
  • the color difference signal (C b, C r) is converted into a form (C b, C r C b 2, C r 2) including a quadratic term, and the primary coefficient (1 Since the color correction is performed by calculating the product of (a) a) and the transformation matrix in which the quadratic coefficients (m, m2) are set, the degree of whitening for the setting of the coefficients increases. That is, the coefficient can be set so that the gain increases as the distance from the origin increases, or the coefficient can be set so that the gain decreases as the distance from the origin increases. Therefore, it is possible to easily perform color correction with a higher degree of freedom and to improve color reproducibility.
  • the first conversion matrix generation unit 53 and the first image are not provided without the second conversion matrix generation unit 55 and the second image conversion unit 56. Only the primary term color correction by the image converter 54 may be performed. Further, the second correction matrix B generated by the second conversion matrix generation unit 55 may be a zero matrix to nullify the color correction of the quadratic term.
  • the present invention is useful for a color correction device for performing color correction of an image signal in an imaging device such as a digital camera, a TV camera, and a video camera, and a display device that captures and displays an image signal. .

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Abstract

Dans un espace de signal de différence de couleurs ayant quatre axes : axe Cb+, axe Cb-, axe Cr+ et axe Cr-, la correction de couleurs est réalisée par pivotement et extension/contraction des quatre axes indépendamment les uns des autres. Lorsque les axes d'un côté ou des deux côtés de la zone dans laquelle un signal de différence de couleur (Cb, Cr) à corriger existe sont pivotés et étendus/contractés, les autres axes sont également pivotés et étendus/contractés de manière à réduire l'effet sur les autres couleurs. Ainsi, lorsqu'une couleur souhaitée est soumise à une correction de couleur, l'effet sur les autres couleurs peut être réduit et la continuité de la couleur aux limites des quatre axes peut être facilement maintenue, réalisant ainsi une correction de couleur avec un fort degré de liberté.
PCT/JP2005/009220 2004-05-18 2005-05-13 Dispositif de correction de couleur, méthode de correction des couleurs et méthode d'affichage de la correction des couleurs WO2005112429A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0799589A (ja) * 1993-05-21 1995-04-11 Mitsubishi Electric Corp カラー画像装置及びカラー画像調整方法
JPH09200792A (ja) * 1995-12-28 1997-07-31 Samsung Electron Co Ltd 色相調整方法及び装置
JPH1141477A (ja) * 1997-07-23 1999-02-12 Fuji Xerox Co Ltd 画像処理装置
JP2000023185A (ja) * 1998-06-30 2000-01-21 Victor Co Of Japan Ltd 色情報処理装置及び色情報処理方法
JP2002176656A (ja) * 2000-09-18 2002-06-21 Sanyo Electric Co Ltd 色補正回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0799589A (ja) * 1993-05-21 1995-04-11 Mitsubishi Electric Corp カラー画像装置及びカラー画像調整方法
JPH09200792A (ja) * 1995-12-28 1997-07-31 Samsung Electron Co Ltd 色相調整方法及び装置
JPH1141477A (ja) * 1997-07-23 1999-02-12 Fuji Xerox Co Ltd 画像処理装置
JP2000023185A (ja) * 1998-06-30 2000-01-21 Victor Co Of Japan Ltd 色情報処理装置及び色情報処理方法
JP2002176656A (ja) * 2000-09-18 2002-06-21 Sanyo Electric Co Ltd 色補正回路

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