Anti-recompression video watermarking method for controlling bit rate increase

Abstract

The invention discloses an anti-recompression video watermarking method for controlling bit rate increase. The method comprises the following steps: carrying out partial entropy decoding on an original HEVC video to obtain a QDST coefficient of each pixel point in each coding unit in each P frame; calculating the texture complexity of each 4 * 4 block according to the number of non-zero coefficients in the QDST coefficients of all pixel points in each 4 * 4 block in each P frame and the information entropy of each 4 * 4 block; selecting a stable 4 * 4 block as a watermark carrier according to the texture complexity of all 4 * 4 blocks in the original HEVC video; modulating the symbols of the QDST coefficient of the first pixel point and the QDST coefficient of the second pixel point in each watermark carrier by using a modification rule to realize watermark embedding; meanwhile, the position index of watermark embedding is used as auxiliary information to be transmitted to a decoding end and used in the watermark extraction process; the method has the advantages that the bit rate of the video is not increased after the watermark is embedded into the video, and the method has good robustness of resisting the recompression attack.

Description

technical field [0001] The present invention relates to a video watermarking method, in particular to an anti-recompression video watermarking method for controlling bit rate increase. Background technique [0002] With the rapid development of digital technology and network technology, multimedia digital works in the form of images, audios, and videos have been released on the Internet, and their copyright protection and information integrity assurance have become important issues that need to be solved urgently. When multimedia data is transmitted over an unsecured network, the multimedia data must be protected from intrusion through the network and use by unauthorized third parties. As an important branch in the research field of information watermarking technology, digital watermarking technology is an effective method to realize copyright protection and information integrity assurance of multimedia digital works, and it is also a research hotspot in the current informat...

AI Technical Summary

Problems solved by technology

However, the existing watermarking schemes in the compressed domain are vulnerable to recompression attacks when the quantization parameter QP is changed, and cannot guarantee the copyright of the video file.

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