H264 video watermarking method based on regional DCT (discrete cosine transform) coefficients

Abstract

The invention discloses an H264 video watermarking method based on regional DCT (discrete cosine transform) coefficients, and belongs to the technical field of multimedia information security. The method includes dividing video frame I into regions, calculating energy of each region, selecting proper video regional DCT coefficients to embed watermarks and embedding the watermarks into a plurality of macro blocks dispersedly; and robustness of the watermarks is improved. Dynamic quantifying step sizes are adopted for updating the video regional DCT coefficients, and imperceptibility of the watermarks is improved. Watermark embedding is performed with video coding compression, and affections of the watermark embedding on video code rate are reduced.

Description

technical field [0001] The invention relates to a video watermarking method, in particular to an H264 video watermarking method based on area DCT coefficients, and belongs to the technical field of multimedia information security. Background technique [0002] With the popularization of digital devices, people began to record and make videos by themselves, and some users even sent them online to share with others through social platforms such as Weibo. The Internet itself is a community, and content + community is the future development trend of the video industry. On the one hand, video sharing has played an important role in the promotion of works; on the other hand, video sharing is also a breeding ground for piracy, which greatly infringes on the interests of relevant copyright owners. Take YouTube as an example. Since its establishment, the website has been involved in video infringement lawsuits many times. In March 2007, Viacom sued YouTube on the grounds that its v...

AI Technical Summary

Problems solved by technology

To apply video watermarking technology to the copyright protection of social network videos, watermark embedding needs to consider the following practical issues: 1. Since the video watermark embedding operation has a certain computational complexity, and the number of videos uploaded by the website every day, if If the cost of embedding watermarks is too high, it will be difficult for the website to directly provide fast watermark embedding services for video producers out of interest

4. There are a large number of users watching videos on mobile phones on social networking sites, and most mobile phones currently use hardware to implement video decoding. The increase in the bit rate will cause the hardware buffer to overflow, and even cause the audio and video to be out of sync.

However, the watermarking method proposed by them actually applies the idea of ​​image watermarking directly to the video, and does not take into account the characteristics of the video itself.

In addition, modifying the full-frame DCT coefficients of the video frame also makes the energy of the video frame change greatly, which is likely to cause distortion of some details, and the imperceptibility of the watermark is poor.

[0007] To sum up, the existing video watermarking methods can only partially meet the needs of social networking sites for video watermarking, and cannot be directly applied to social networking sites for copyright protection of videos.

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