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Video fingerprint generation method and device

A video fingerprint and fingerprint technology, applied in the direction of analog security/charging system, etc., can solve the problem of inability to provide multimedia video fingerprints.

Active Publication Date: 2009-04-08
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that effective multimedia video fingerprints cannot be provided in the prior art, an embodiment of the present invention provides a method for generating video fingerprints, including:

Method used

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  • Video fingerprint generation method and device
  • Video fingerprint generation method and device

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Embodiment Construction

[0019] The first embodiment provided by the present invention is a method, and the method flow is as follows figure 1 shown, including:

[0020] Step 101: Extract DCT (Discrete Cosine Transform) coefficients of the I frame.

[0021] You can use the FFMpeg toolkit to decode the video data stream of the video file MPEG series or H.26X series to obtain a single video frame. The attributes of a single frame are divided into I frame, P frame, and B frame according to the encoding method, such as figure 2 shown. In FFMpeg, the video frame AVFrame structure has key_frame attribute and pict_type attribute, only need to use 1==AVFrame->key_frame && FF_I_TYPE==AVFrame->pict_type to extract I frame. Since the intra-frame coding of the I frame adopts DCT coding, DCT coefficients can be directly extracted in the compressed domain without decoding a single frame.

[0022] Step 102: Generate a corresponding DCT vector according to the DCT coefficients of the I frame.

[0023] The genera...

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Abstract

The invention discloses a method for generating a video fingerprint and a device thereof, and aims at solving the problem that an effective multimedia video fingerprint is unavailable in the prior art. The method comprises the following steps: a DCT coefficient of a frame I is extracted; a DCT data matrix is obtained according to the DCT coefficient of the frame I; and the video fingerprint is generated according to the DCT data matrix. The method can generate the video fingerprint.

Description

technical field [0001] The invention belongs to the field of multimedia applications, in particular to a method for generating video fingerprints. 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 and other works through the Internet unprecedentedly, bringing new opportunities for creators and publishers. But at the same time, it is easy for people to illegally copy and distribute products that exist in digital form. How to protect the copyright of digital products has become one of the core issues of copyright protection in the information age. [0003] One way to carry out copyright protection is to use digital fingerprint technology. Digital fingerprint technology takes the initiative to monitor digital content to protect copyright. First, generate digital fingerprints for sensitive digital content that needs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16
Inventor 尹浩陈文涛张焕强黄东李铮惠雯
Owner TSINGHUA UNIV