A Robust Video Watermarking Method Against Geometric Attacks Based on SIFT

Abstract

A robust video watermarking method based on SIFT against geometric attacks. The watermark embedding process is as follows: (1) Express the video frame image in Ycbcr color space, perform a layer of two-dimensional DWT transformation on the Y component of the image, and select the wavelet base is the haar wavelet, and obtain the low-frequency components after DWT transformation; (2) take n frames as a group, perform SIFT feature point extraction on the low-frequency components obtained after (1) in the first frame of each group, and record the obtained feature point positions; ( 3) Add a change amount determined by the watermark information to the pixel value at the feature point position; (4) Perform DWT inverse transformation to obtain the Y component after embedding the watermark, and then convert from Ycbcr space to RGB space to complete the watermark embedding . (1) and (2) of the watermark extraction process are the same as the embedding process, and then predict the pixel value at the feature point according to the surrounding pixels to obtain the predicted difference value, which is obtained by comparing the predicted difference value with the set threshold value Embedded watermark information. The invention improves the robustness of the video watermarking method to geometric attacks, and has small distortion and simple processing.

Description

technical field [0001] The invention relates to a robust video digital watermarking method, in particular to a robust video watermarking method against geometric attacks based on SIFT (Scale-invariant feature transform). Background technique [0002] As we all know, digital multimedia has replaced the traditional analog form. With the continuous development of Internet communication technology, digital multimedia can be copied and disseminated conveniently and quickly, and the piracy and copyright disputes caused by this have become increasingly serious social problems. According to an estimate by the Recording Industry Association of America, the annual economic loss caused by piracy in the world is as high as 5 billion US dollars, and the American Film Industry Association estimates that piracy reduces the annual income of the US film industry by 2.5 billion US dollars. [0003] The traditional means of copyright protection is password authentication technology. Cryptograp...

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Problems solved by technology

[0003] The traditional means of copyright protection is password authentication technology. Cryptography technology can ensure the information security of digital works during the transmission process from the sender to the recipient. replication of

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