WO2006001645A1

WO2006001645A1 - Generation method of the motion picture data with the integrated format

Info

Publication number: WO2006001645A1
Application number: PCT/KR2005/001956
Authority: WO
Inventors: Sung Ryul Cho
Original assignee: Udworks Co., Ltd.
Priority date: 2004-06-25
Filing date: 2005-06-23
Publication date: 2006-01-05
Also published as: KR100463490B1

Abstract

A method of producing video data in an integrated format by converting the format of first video data received from a digital video recorder (DVR), is provided. The method includes detecting a codec format containing video information from the first video data and detecting a start code of the codec format; detecting a header of the codec format and converting the header into a standard header; detecting an end code of the codec format; detecting and extracting an elementary stream (ES) code from the codec format; generating a compressed video signal by converting the format of the ES code; and obtaining second video data by combining the standard header with the compressed video signal. Accordingly, a user who uses a security apparatus using a DVR can convert and reproduce video data in an integrated format, the video data being received from a plurality of DVRs installed in a plurality of spaces, the security of which must be guaranteed, into an integrated format.

Description

GENERATION METHOD OF THE MOTION PICTURE DATA

WITH THE INTEGRATED FORMAT

Technical Field [1] The present invention relates to a method of generating motion picture data(or video data) in an integrated format, and more particularly, to a method of generating video data in an integrated format, in which a codec format in which a video signal is recorded is extracted from digital video data stored in various formats and the digital video data is converted and reproduced in a video data having a standard format. Background Art [2] Conventionally, a closed circuit television (CCTV) is used for unmanned monitoring in households, offices, factories, or government offices. Such a monitoring device is manufactured by connecting a camera to a coaxial cable such that an image captured by the camera is displayed on a monitor while the image is stored in a video recorder. However, since the device stores an image as an analog signal, it is in¬ convenient to store and detect data. [3] To solve this inconvenience, a digital video recorder (DVR) that digitizes and stores audio and video of an image has been proposed. FlG. 1 is a block diagram illustrating the structure of a conventional DVR. In the DVR of FlG. 1, an analog-to-digital (AfD) converter 104 converts an image captured by a camera 102 into a digital signal, and an encoder 106 compresses the digital signal from A/D converter to produce first video data. The produced first video data is stored in a storage unit 108, such as a hard disc, a compact disc (CD), or a digital versatile disc (DVD), so that it can be semi¬ permanently stored and easily detected and reproduced. An output unit 110 reads the first video data from the storage unit 108, decompresses it, decodes it into the original video signal, and displays it on a monitor, for example. [4] An image captured by a DVR is compressed to reduce the amount of the data. In general, a codec, such as H.263, MPEGl, MPEG2, or MPEG4, is used to compress or reproduce data. [5] In particular, the MPEG4 has been widely used as a compression codec of video data, since it supports a transmission rate of data from lOKbps to IMbps, ex¬ pandability, editing of content, robustness to errors, a multimedia data access tool, and improved coding efficiency. [6] However, conventionally, a compression codec in which video data is produced is different according to a manufacturing company of a DVR. Even if the same compression codec is used, it may be different from a format and a frame, such as a header, of video data. Accordingly, video produced using a DVR manufactured by one company cannot be reproduced by a DVR manufactured by another company. [7] Therefore, when a DVR that is manufactured by a company different from that of the existing DVR is further installed, an additional output device must be installed, thereby increasing manufacture costs and causing inconvenience in managing data. Disclosure of Invention Technical Solution [8] The present invention provides a method of generating video data in an integrated format, in which a codec is extracted from first video data made by digital video recorders (DVRs) manufactured by different companies and second video data is produced in an integrated codec, thereby providing an integrated monitoring en¬ vironment under which video data can be reproduced using a DVR manufactured by a different manufacturing company from a DVR producing the video data. [9] The present invention also provides a method of generating video data in an integrated format, in which when first video data includes a start code and an end code, a codec format is conveniently extracted by detecting the start and end codes. [10] The present invention also provides a method of generating video data in an integrated format, in which when first video data does not include a start code and an end code, image data is produced while decoding the first video data and second compressed video data is produced by encoding the produced image data. Advantageous Effects [11] According to the present invention, a user who uses a security apparatus using a DVR is allowed to convert and reproduce video data in an integrated format, the video data being received from a plurality of DVRs installed in a plurality of spaces, the security of which must be guaranteed. [12] Also, it is possible to reproduce video data stored in a medium, the security of which must be guaranteed, in real time via the Internet by compressing the video data in MPEG4 codec and storing and transmitting the result of compression. Brief Description of the Drawings [13] FlG. 1 is a block diagram of the structure of a conventional digital video recorder (DVR). [14] FlG. 2 is a block diagram of a DVR according to an embodiment of the present invention. [15] FlG. 3 illustrates constructions of first and second video data. [16] FlG. 4 is a flowchart illustrating a method of generating second video data according to an embodiment of the present invention. [17] FlG. 5 is a flowchart illustrating a method of generating second video data according to another embodiment of the present invention. Best Mode for Carrying Out the Invention [18] According to an aspect of the present invention, there is provided a method of producing video data in an integrated format by converting the format of first video data received from a digital video recorder (DVR), the method including extracting a codec that contains video information from the first video data and detecting a start code of the codec; detecting a header of the codec and converting the header into a standard header; detecting an end code of the codec; detecting and extracting an elementary stream (ES) code from the codec; generating a compressed video signal by converting the format of the ES code; and combining the standard header with the compressed video signal to generate second video data. [19] The compressed video signal has an MPEG4 codec. [20] When the ES code has an H.263 format, an image signal is generated by decoding the ES code, and the compressed video signal is generated by encoding the image signal according in the MPEG4 codec. [21] When the ES code has an MPEGl codec or an MPEG2 codec, the compressed video signal is generated by converting the format of the ES code in the MPEG4 codec through table mapping. [22] When the ES code has the MPEG4 codec, the start code is extracted from the ES code and converted into a standard start code. [23] According to another aspect of the present invention, there is provided a method of producing video data in an integrated format by converting the format of first video data received from a DVR, the method including producing a standard header; generating an image signal by decoding the first video data; generating a compressed video signal by encoding the image signal in an MPEG4 format; and producing second video data by combining the standard header with the compressed video signal. [24] The first video data has a modified MJPEG format, and the compressed video signal has the MPEG4 format. Mode for the Invention [25] FIG. 2 is a block diagram of the structure of a digital video recorder (DVR) according to an embodiment of the present invention. The construction of the DVR of FIG. 2 is similar to that of a conventional DVR such as that shown in FIG. 1, except that second video data is produced by converting the format of first video data read from a storage unit 108 into a standard format. [26] FIG. 3 illustrates constructions of first and second video data according to an embodiment of the present invention. The first video data is digital video data produced by a DVR, and the second video data is obtained by converting the format of the first video data into an integrated format. [27] The first video data includes a codec composed of a start code 202, a header 204, an end code 206, and an elementary stream (ES) code 208. [28] Here, codec is an abbreviation of a compound word of a coder that converts an analog audio/video signal into a digital signal and a decoder that converts the digital signal into the audio/video signal. Also, the codec may denote a combination of a modulator and a demodulator, which converts and stores an image/music data into a computer readable language and interprets the language to reproduce the image/music data. [29] The start code 202 is a code indicating the start of the codec, which is determined according to the international standard. [30] The header 204 is an information data block located at a start point of a computer file to specify the name and size of a file, dates on which the file is made or changed, and so on. In addition, the header 204 contains identification information and control information transmitted from a transmitting/receiving station for network commu¬ nications. [31] The form and format of the header 204 vary depending on a manufacturing company of the DVR that produces video data, and thus, the format must be converted into an integrated format so that video data can be reproduced by an integrated re¬ producing apparatus. [32] The end code 206 is a code indicating the end of the codec, which is determined according to the international standard, similar to the start code 202. The ES code 208 contains a video signal captured by the DVR and is compressed by an encoding manner selected according to the manufacturing company of the DVR. [33] A standard header 302 is obtained by converting the format of the header 204 included in the first video data into an integrated format and recording information regarding the integrated format. A compressed video signal 304 is obtained by compressing the ES code 208 into new video data. According to an embodiment of the present invention, the MPEG4 is used to compress the ES code 208. [34] FIG. 4 is a flowchart illustrating a method of producing second video data according to an embodiment of the present invention. The method of FIG. 4 is applicable to a codec that includes start and end codes, particularly, when converting first video data that has a codec such as H.263, MPEGl, MPEG2, MPEG4, or standard MJPEG. [35] Referring to FIGS. 3 and 4, whether a codec included in first video data, which is received from a DVR, contains the start code 202 is determined (S 102). Next, the header 204 of the first video data is converted into the standard header 302 (S104). Next, the end code 206 of the codec is detected to determine a position where a video signal is recorded (S 106). [36] When the start code 202 and the end code 206 are detected, the location of the ES code 208 excluding the header 204 is disclosed. Therefore, the ES code 208 is extracted from the first video data, using the start code 202 and the end code 206 (S 108). [37] Next, the extracted code 208 is converted into the compressed video signal 304 (SIlO). The compressed video signal 304 preferably has the MPEG4. Specifically, when the ES code 208 has the MPEGl codec or the MPEG2 codec, the ES code 208 is converted into an 'avi' file or an 'asf file through code table mapping. When the ES code 208 has the H.263 codec, the ES code 208 is decoded to generate an image signal, and then, the image signal is encoded in the MPEG4 codec to generate the compressed video signal 304. [38] When the ES code 208 has the MPEG4 codec, it is possible to generate the compressed video signal 304 just by converting the start code 202. After generating the compressed video signal 304 in the MPEG4 codec, the second video data having a standard codec is made by combining the compressed video signal 304 with the standard header 302 (Sl 12). [39] FIG. 5 is a flowchart illustrating a method of producing second video data according to another embodiment of the present invention. The method of FIG. 5 is applicable to conversion of first video data having a modified MJPEG format that does not include start and end codes, particularly, when converting video data produced by a DVR manufactured in Taiwan or China. [40] When the first video data has a codec format that does not include the start code 202 and the end code 206, the header 204 is detected and converted into the standard header 302(S202). Next, the ES code 208 included in the codec format is decoded to generate an image signal(S204). [41] Next, the image signal is encoded in the MPEG4 codec to obtain the compressed video signal 304(S206). Then, as described with reference to FIG. 4, the standard header 302 and the compressed video signal 304 are combined to produce the second video data (S208). [42] As described above, according to the present invention, second video data that is produced by converting various video codec formats into the MPEG4 format and combining a standard header with a compressed video signal, is decoded using a dedicated viewer to be displayed as video. Accordingly, a user who uses a DVR is able to view the video on an output unit irrespective of the manufacturing company of the DVR. [43] While this invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Industrial Applicability [44] The present invention is applicable to a computer readable medium that stores a computer program that runs an apparatus and method for recording video data.

Claims

Claims [1] A method which produces video data in an integrated format by converting a format of first video data received from a digital video recorder, the method comprising: detecting a codec format which contains video information from the first video data, and a start code of the codec format; detecting a header of the codec format, and converting the header into a standard header; detecting an end code of the codec format; detecting and extracting an elementary stream code from the codec format; generating a compressed video signal by converting the format of the elementary stream code; and obtaining second video data by combining the standard header with the compressed video signal. [2] The method of claim 1, wherein the compressed video signal has an MPEG4 format. [3] The method of claim 2, wherein when the elementary stream code has an H.263 format, a compressed video signal is obtained by decoding the elementary stream code to generate an image signal and encoding the image signal in the MPEG4 format. [4] The method of claim 2, wherein when the elementary stream code has one of an MPEGl format and an MPEG2 format, a compressed video signal is obtained by converting the elementary stream code into the MPEG4 format through code table mapping. [5] The method of claim 2, wherein when the elementary stream code has an MPEG4 format, the start code is extracted from the elementary stream code and converted into a standard start code. [6] A method of producing video data in an integrated format by converting a format of first video data received from a digital video recorder, the method comprising: making a standard header; generating an image signal by decoding the first video data; generating a compressed video signal by encoding the image signal in an MPEG4 format; and obtaining second video data by combining the standard header with the compressed video signal. [7] The method of claim 6, wherein the first video data has a modified MJPEG format, and the compressed video signal has an MPEG4 format.