Visible sensation characteristic based video watermark process

Abstract

The invention discloses a video watermark method based on vision characteristic, the method is based on discrete cosine transform technique, and firstly the video frame is discrete cosine transformed to pick up characteristics such as veins, brightness and edge of sub block; then picking up the movement characteristic of video frame to construct a mixed self adapting sub block characteristic adopting model; at last, according to dual requirements of vision sensitivity speciality and watermark robustness, constructing a characteristic Stat constringency model to generate self adapting video watermark method which is accordant with vision sensing model of human. The veins, brightness and edge of sub block and movement characteristic picked up in the invention expresses the vision characteristic, depend on dual requirements of vision sensitivity speciality and watermark robustness, the embedded energy of watermark is refined further, the relative watermark embedding course of video watermark and video vision characteristic is realized, problem of deficient robustness when video watermark technique is applied is resolved.

Description

technical field [0001] The invention relates to the technical field of multimedia digital watermarking, in particular to a video watermarking method based on visual features. Background technique [0002] MPEG is currently the mainstream format for video encoding. With the further popularization of the Internet and the advent of the 3G era, online video will be widely popular. Therefore, watermark protection for MPEG video files has wide application value. Video clips usually contain rich visual features. In order to realize the copyright protection of massive Internet-oriented data, the visual features of the video itself must be effectively utilized. Due to the huge amount of data, this requires that the watermarking algorithm should have certain statistical characteristics, so that it can be applied to most video clips. [0003] Most existing video watermarking schemes including MPEG adopt the idea of ​​extending watermark energy to all pixels in a frame. This type of ...

AI Technical Summary

Problems solved by technology

This type of scheme has the advantage of low computational complexity, but it is at the expense of local control over the embedding position and limiting the strength of watermark embedding. Essentially, this type of scheme does not depend on visual features and cannot be based on video visual features. Variations come from adapting to embedding watermarks of appropriate strength; another class of schemes proposes a selective distribution of watermark energy in space, but such schemes usually consider MPEG-2 coding structure more than visual characteristics

[0004] At present, the existing video watermarking algorithms still have certain deficiencies in the watermarking technology that relies on the consistency of video features and human visual perception systems, and there are even fewer video watermarking methods with statistical characteristics that can be widely applied on the Internet.

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