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Method and device for detecting audio/video copy based on copy cells

A technology of copying unit and detection method, which is applied in the field of audio and video processing, can solve the problems that digital watermarks are not exclusive, digital watermarks are difficult to resist re-encoding attacks, and increase audio and video production processes, etc.

Inactive Publication Date: 2015-04-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The shortcoming of the detection method of a kind of audio and video copy in the above-mentioned prior art is: this method has considerable limitation: the first, digital watermark needs to be embedded when making audio and video, thereby increased the cost of audio and video production. Second, embedding watermarks will lead to a partial decline in the quality of audio and video; third, digital watermarks are difficult to resist re-encoding attacks, especially for encoding and compression; fourth, digital watermarks are not exclusive, that is: anyone can in Digital watermarks are embedded in audio and video, making it impossible to determine the copyright owner; fifth, digital watermarks cannot resist analog traps, that is, video recordings by camera or music re-recording by tape machines

Method used

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  • Method and device for detecting audio/video copy based on copy cells
  • Method and device for detecting audio/video copy based on copy cells
  • Method and device for detecting audio/video copy based on copy cells

Examples

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Embodiment 1

[0069] The embodiment of the present invention proposes a method for judging audio and video copy (or approximate copy) and infringement judgment based on the copy unit. It is CU (Copy Unit, copy unit), has a predefined time length (such as 3 seconds), contains a set number of frames, and judges two audio and video by the similarity of the copy unit rather than the similarity between two audio and video Whether the video constitutes a copy.

[0070] In law, usually only when the length of similar or identical content of two videos (or audios) exceeds a certain threshold (such as 3 seconds, 5 seconds, 10 seconds or 1 minute), it can be determined that the two videos (or audios) exist copy or near copy. This fact tells us that to judge whether there is a copy of two pieces of audio and video, we should not look at the similarity of the overall content of the two pieces of audio and video, or the similarity of a certain part of them, but should be based on the most similar copy ...

Embodiment 2

[0115] In this embodiment of the present invention, a video is taken as an example to describe the content of the invention. The formal description of the copy unit between query video q and reference video r is:

[0116] Suppose the query video q has a total of L q frame, respectively with Q 1 ,Q 2 ,...,Q Lq express. Suppose the reference video r has a total of L r frame, respectively with R 1 , R 2 ,...,R Lr express. Assume that the number of frames contained in the predefined copy unit is denoted as L (corresponding to the above-mentioned predefined copy unit length), and it is guaranteed that L≤L q ,L≤L r (if L is greater than L q or L r , it is considered that the sequence to be matched is too short, and no search is performed). Then a copy unit between q and r is defined as CU{i,j,L|q,r}, which means that two L Fragment pairs, specifically: {Q i ,Q i+1 ,...,Q i+L-1} and {R j , R j+1 ,...,R j+L-1}. By definition, for length L q A video of q and lengt...

Embodiment 3

[0152] This embodiment provides an audio and video copy detection device based on a copy unit, and its specific implementation structure is as follows: Figure 7 As shown, it can specifically include the following modules:

[0153] Key frame extraction module 71, is used to extract the key frame in inquiry audio-video and reference audio-video;

[0154] The most similar copy unit search module 72 is used to calculate the similarity between the key frame of the query audio and video and the key frame of the reference audio and video, and search the audio and video and the reference audio and video based on the similarity. the most similar copy unit in the video;

[0155] The copy determination module 73 is configured to determine whether there is a copy between the query audio and video and the reference audio and video according to the similarity between the query audio and video and the most similar copy unit in the reference audio and video.

[0156] Further, the key frame...

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Abstract

The invention provides a method and a device for detecting audio / video copy based on copy cells. The method mainly comprises the steps of extracting key frames in an inquiry audio / video and a reference audio / video, calculating the similarity between the key frame of the inquiry audio / video and the key frame of the reference audio / video, searching for the most similar copy cells in the inquiry audio / video and the reference audio / video based on the similarity, and judging whether copy is present in the inquiry audio / video and the reference audio / video based on the similarity of the most similar copy cells in the inquiry audio / video and the reference audio / video. The method for detecting audio / video copy based on the copy cells is capable of judging whether the inquiry audio / video is the copy of the given reference audio / video accurately and quickly and performing repeatability or infringement judgment on the inquiry audio / video on the basis. Besides, according to the method, the process of audio / video making does not need to be changed and the quality of the audio / video is not reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of audio and video processing, and in particular, to an audio and video copy detection method and device based on a copy unit. Background technique [0002] With the continuous development of social economy and cultural level, the scale of the global film and television industry is also expanding rapidly. On the one hand, the scale of the traditional film and television industry (such as film and television) still maintains a steady growth. For example, in 2011, the total box office of movies in Mainland China was 13.115 billion yuan, and by 2013, this value had reached 21.769 billion yuan. Yuan (28.8% average annual growth rate); on the other hand, the scale of the online film and television industry (such as: online video website, mobile video) has a greater growth than the traditional film and television industry, for example, in the first quarter of 2011 The scale of China's online...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/10G06F17/30
CPCG06F16/43G06F21/10
Inventor 田永鸿杨媛媛钱梦仁黄铁军
Owner PEKING UNIV
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