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Quickly generating method of user copy based on video GOP (Group of Picture)

A user and video technology, applied in the direction of digital video signal modification, TV, instrument, etc., can solve the problems of unavailable practical application, long generation time, etc., and achieve good versatility and practicability

Inactive Publication Date: 2011-02-16
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

For ordinary movie works, using traditional digital watermarking technology, the time to generate a user copy embedded with unique fingerprint information for each user is often equivalent to the time of one video encoding, which cannot be practically applied due to the long generation time

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  • Quickly generating method of user copy based on video GOP (Group of Picture)
  • Quickly generating method of user copy based on video GOP (Group of Picture)

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Embodiment Construction

[0030] Below first the theoretical basis of the present invention is described:

[0031] 1. Video coding structure

[0032] The raw video stream is composed of frames of images. The existing video compression coding technology divides the video into multiple picture groups. Each picture group contains an I frame, multiple P frames and B frames, such as arranged in IBBPIBBPIBBPI... style, this continuous picture group is GOP (GROUP OF PICTURE), which is used for accessing compressed video streams The most basic unit, its sequence will be repeated until the end of the image. I is an intra-coded frame, P is a forward-prediction frame, and B is a bidirectional interpolation frame. Simply put, the I frame is a complete picture, while the P frame and B frame record changes relative to the I frame. Without I-frames, P-frames and B-frames cannot be decoded. The GOP composition structure of the video compression code stream is as follows: figure 2 shown.

[0033] 2. Concatenate...

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Abstract

The invention relates to the technical field of digital content safety protection, in particular to a quickly generating method of a user copy based on a video GOP (Group of Picture), which is based on a cascade fingerprint code technology. The user-copy generating process comprises the following steps of: generating female copy video source files according to an internal code sequence of a fingerprint code; according to an external code of a user, sequentially extracting corresponding image block groups from the corresponding female copy video source files; and generating an only user copy by combining and splitting the GOP image block groups. The invention reduces time for generating a user video copy to time for copying a video resource from time for coding a video resource, can quickly generate large numbers of video copies in short time and is suitable for a real-time on-line publication system of audio-video works which face to large-scale users. The provided algorithm of the invention has good universality and good practicability and can be suitable for common video coding standards, such as H.264, MPEG(Motion Picture Experts Group)-2, MPEG-4, AVS (Advanced Visual System), and the like.

Description

technical field [0001] The invention relates to the technical field of digital content security protection, in particular to a method for quickly generating user copies based on video GOP. Background technique [0002] In recent years, the rapid development of information technology and the wide application of e-commerce based on it have expanded the scope of dissemination of various texts, pictures, videos and other works through the Internet unprecedentedly, bringing new opportunities for creators and publishers. But at the same time, it is also easy for people to illegally copy and distribute products that exist in digital form. At present, digital fingerprint technology has been extensively studied by scholars at home and abroad. This technology embeds unique fingerprint information in each copy of a protected work, making each copy slightly different from other copies, ensuring that each copy of the user Copy Get the only copy. When the publisher discovers an illegal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/24H04N7/26G06F21/62H04N19/467
Inventor 任延珍胡瑞敏夏阳黄轩
Owner WUHAN UNIV
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