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Video-frequency identifying method based on small wave conversion and mixed watermark

An authentication method, wavelet transform technology, applied to TV, color TV, color TV parts, etc., can solve the problem of immature video authentication method

Inactive Publication Date: 2009-11-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing video authentication methods are not mature, especially the lack of methods that can effectively combine inter-frame authentication and intra-frame authentication

Method used

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  • Video-frequency identifying method based on small wave conversion and mixed watermark
  • Video-frequency identifying method based on small wave conversion and mixed watermark
  • Video-frequency identifying method based on small wave conversion and mixed watermark

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Embodiment Construction

[0045] The present invention adopts the hybrid watermarking method, and embeds the position information of the representative video frame image on the time axis and the feature information of the representative frame image content as a watermark in the video frame image. When the video is subjected to normal signal processing, it is considered The video is credible, and when the video is maliciously tampered with, not only can it be judged that the video is not credible, but also the location of the tampering can be located.

[0046] A practical example of the video authentication method of the present invention is introduced below.

[0047] Now describe the process of completing watermark embedding and detection with the method of the present invention. Experimental results with salesman, pairs, Stockholm Pan and mobile test sequences (size 352x288) are given here. There are four aspects: invisibility; precise location of malicious tampering; robustness of inter-frame authen...

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Abstract

A digital video authentication method based on wavelet transform and hybrid watermark. The invention embeds watermarks with different functions in different ways in different sub-bands of wavelet transform, and effectively combines inter-frame authentication and intra-frame authentication. First, the identification video The position information of the frame in the video sequence is embedded in a wavelet transform subband of the original video frame in the form of a robust watermark. During authentication, the watermark is extracted to obtain the position information of the frame. By judging whether there is abnormal position information, the video is authenticated in the time axis. Then extract the semi-fragile feature of each frame image as a watermark, and embed it in the two subbands of the wavelet transform in a robust and semi-fragile manner, which are used to judge whether the frame image is credible and in the authentication process respectively. The frame image is located for malicious tampering when it is untrustworthy. The method of the invention can correctly judge whether the processing of the video is malicious tampering or normal video processing, and can accurately locate the tampering positions between frames and within frames.

Description

technical field [0001] The invention is a video authentication method based on wavelet transform and mixed watermark technology, which can correctly judge whether the video processing is malicious tampering or normal video processing, and can accurately locate the tampered position, and belongs to the field of multimedia signal processing. Background technique [0002] In the past ten years, digital multimedia has gradually penetrated into people's daily life. Among various multimedia information, digital video occupies a very important position. However, with the development of multimedia processing technology, it is very easy to edit and modify videos, and it is difficult to distinguish the authenticity from the fake with the naked eye. When the video content involves political, military, court evidence, and other information, its credibility (such as whether surveillance video, TV broadcast programs, etc. have been modified) must be confirmed. Therefore, video authentic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/913G06T1/00
Inventor 刘红梅黄继武朱凌
Owner SUN YAT SEN UNIV
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