AVS video watermarking method based on gray theory and uniform spectrum theory

Abstract

The invention discloses an AVS video watermarking method based on gray theory and uniform spectrum theory, which mainly solves the problem that the prior video watermarking method is small in embedding capacity and poor in robustness. When a watermark is embedded in an AVS video in a coding process, firstly, an original-gray image watermark is extracted by utilizing gray prediction, compressed and embedded with information content and converted into a binary series; secondly, the correlation degree among host video blocks is calculated by utilizing gray correlation, and a block at minimum correlation degree is selected as a watermark embedding position, and an embedding region is subjected to uniform spectrum processing; and finally, the parity of a quantization coefficient after uniform spectrum processing is adjusted so as to embed the watermark. When the watermark is extracted, a watermark-extracting position is determined according to a key, and a binary watermark is extracted in a mode reciprocal with embedding and is recovered into a gray watermark. Based on AVS standard, the method has the advantages of large embedding capacity and strong robustness, and can be used for thecopyright protection of AVS digital multimedia products.

Description

technical field [0001] The invention belongs to the field of multimedia information processing, relates to a digital video watermarking method of the AVS (Audio and Video Coding Standard of China) national audio and video coding standard, and can be used for copyright protection of AVS digital multimedia products. Background technique [0002] As a copyright protection method for digital video data, video watermarking technology has important commercial value, and it is a hot and difficult point in the current research direction of watermarking technology. The scale of video data is huge, and video watermarking methods must meet the requirements of real-time performance and constant bit rate. Unlike image watermarking methods, there are also unique attacks against video sequences, and mature image watermarking methods cannot be directly transplanted. The existing literature on video watermarking includes: [0003] [1] Maneli Noorkami, Russell M. Mersereau, Compressed-Domain...

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Problems solved by technology

[0003] [1] Maneli Noorkami, Russell M. Mersereau, Compressed-Domain Video Watermarking for H.264, IEEE International Conference on Image Processing 2005, 2: 890-893. Utilizing the DC components of adjacent 4×4 blocks in a video I frame macroblock The difference between them is used as the key, and the quantization coefficient in the macroblock is randomly selected as the watermark embedding point. Only one bit of watermark is embedded in each macroblock. The capacity of the method is small, and the robustness needs to be improved.

[0004] [2] Huang Liang, Research on the MPEG-2 Video Watermarking Scheme Based on SpreadSpectrum Technology, IEEE International Conference on Computer Engineering and Technology, 2009, 2: 408-411. Spread spectrum processing for watermarking, in the DC of video chrominance block The watermark is embedded on the coefficient, and the embedding capacity is small, which cannot meet the development trend of using grayscale images and color images as watermarks

[0005] [3] Jianquan Xie, Chunhua Yang, Dazu Huang2, Duosi Xie, A Large Capacity BlindInformation Hiding Algorithm, Proceedings of the International Symposium on ElectronicCommerce and Security, 2008, 130: 934-937. Proposed uniform spectrum processing for the entire image Finally, the watermark is embedded on the DCT coefficients, which increases the embedding capacity and transparency of the watermark. However, the amount of video data is huge and the real-time requirements are strong. This method cannot be directly applied to video watermarking.

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