Color image digital watermarking method based on compressed sensing and NSCT

Abstract

The invention discloses a color image digital watermarking method based on compressed sensing and NSCT. According to the method, color carrier images R, G and B are decomposed, all three color components are partitioned in an equal-area non-overlapping mode, and m partitions are randomly selected from all partitions to form an embedded array Q1. NSCT decomposition is carried out on all embedded blocks in Q1, a low-frequency component LU of the embedded blocks is taken for decomposition, and SVD decomposition is carried out on a diagonal matrix to extract singular values; a watermark image is equally divided into m / 2 blocks, and the measurement value of each block is extracted by the same compressed sampling operator. The measurement value of the jth watermark is embedded into the singularvalues of the jth block and the 2jth block in the array Q1 respectively, and watermark information is extracted only by selecting the embedded blocks according to the rule when the watermark is embedded. According to the method, the data redundancy is reduced through block compressed sensing of the watermark image, high-capacity watermark embedding is ensured, and meanwhile, the security of the watermark is improved through compressed sensing. The method can effectively resist geometric attacks such as shearing, scaling, JPEG compression, high-pass filtering and salt and pepper noise, and is suitable for copyright protection of color digital images.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a color image digital watermarking method based on compressed sensing and NSCT. Background technique [0002] The digitization of information is an important feature of the development of today's society, with the explosive growth of digital information (images, audio, video, digital publishing, etc.). It is becoming more and more convenient for people to obtain digital information through the Internet, and the cost of piracy is also getting lower and lower. As an effective means of intellectual property protection and digital multimedia information anti-counterfeiting, digital watermarking was born to protect the rights and interests of original creators and copyright buyers. [0003] Due to the large amount of information contained in color images, it has gradually become a hot spot in watermarking research in recent years. However, the existing color image digital...

AI Technical Summary

Problems solved by technology

On the one hand, the present invention solves the problem of too concentrated watermark embedding, on the other hand, it reduces the redundancy of watermark information through compressed sensing, increases the amount of information embedded in watermark, and compressive sensing further increases the security of watermark information ( Both the compressed sensing observation matrix seed and block size can be used as the key, as the prior condition for watermark extraction)

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