Method and system for generating and detecting digital watermark in video

Abstract

The invention discloses a method and a system for generating and detecting a digital watermark in a video. The method comprises steps of generating the video including the digital watermark and detecting the digital watermark in the video, wherein the step of generating the video including the digital watermark comprises the following sub-steps: generating a pseudorandom sequence according to a watermark embedding key; generating a zero matrix, carrying out zigzag sorting on the zero matrix, and replacing continuous partial elements in the sorting result with elements in the pseudorandom sequence; and obtaining a new matrix according to the replaced sorting result, and carrying out an inverse discrete cosine transformation on the new matrix to generate a digital watermark matrix; and the step of detecting the digital watermark comprises the following sub-steps: determining a distortion intensity coefficient of video barrel distortion; carrying out a pillow-like transformation on the video according to the coefficient, obtaining a sequence according to the transformed video; and judging whether the digital watermark is embedded or not according to the correlation of the sequence and the pseudorandom sequence generated according to the watermark embedding key. According to the method and the system, whether the digital watermark is embedded into the video or not can also be detected even if the video is subjected to barrel distortion.

Description

technical field [0001] The invention relates to the technical field of digital video, in particular to a method and system for generating and detecting a digital watermark in a video. Background technique [0002] Along with the rapid development of information technologies such as digital media and the Internet and the rapid popularization of cheap computing terminals, various network multimedia information services have also achieved considerable development. While these advanced information technologies bring convenience to the general public, they also provide convenience to pirates, thereby threatening the legitimate rights and interests of copyright owners. For example, anyone can easily obtain other people's original works through the Internet without distortion, especially digitized images, music, videos, etc., and can freely copy, modify, produce and reproduce the original works without the author's consent. Transmission, etc. These illegal acts have seriously viol...

AI Technical Summary

Problems solved by technology

It can be seen that the video files played in the head-mounted virtual reality glasses are subjected to barrel transformation, which is a new type of attack on the watermark contained in the original video. The distortion of the picture will lead to the failure of the original watermark system, making the watermark extractor It is impossible to detect whether a digital watermark containing copyright information is embedded in the video from the attacked video file

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