A full frequency domain subband digital watermark embedding method based on wavelet decomposition

Abstract

A full-frequency domain sub-band digital watermark embedding method based on wavelet decomposition. This method decomposes the Y component of the color carrier image with a first-level wavelet; take all four frequency domain sub-bands HH, HL, LH and LL for equal-area non-overlapping Blocking, randomly select embedded blocks in the four frequency domain sub-bands according to the rules to form the full frequency domain embedded block array B; all embedded blocks are decomposed by LU, and the diagonal matrix SVD is selected for decomposition; after the gray watermark image is scrambled, the equal area is non-overlapping It is divided into p×p blocks, and each watermark block is decomposed by SVD; the singular value of the carrier block is modified to complete the cyclic embedding of the watermark. When watermark is extracted, as long as any continuous p×p embedding blocks in the embedding array are selected, the complete watermark information can be extracted. The method of the invention can effectively resist geometric attacks such as shearing, brightness adjustment, high-pass filtering, lossless compression, scaling and the like. The present invention balances the relationship between invisibility and robustness on the premise of ensuring large-capacity watermark embedding. The invention 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 method for embedding digital watermarks in full frequency domain subbands based on wavelet decomposition. Background technique [0002] Digitization and networking have become two obvious characteristics of today's social development: the use and distribution of digital media information (such as digital images, digital audio, digital video, etc.) has exploded in the past 10 years. While people can obtain digital information and online services conveniently and quickly through the Internet, many methods and means that damage the interests of copyright owners such as stealing, tampering, and piracy have also become easier. It is against this background that digital watermarking, as an effective means of intellectual property protection and digital multimedia information anti-counterfeiting, emerges and develops. Digital watermarking is to add the watermark informatio...

AI Technical Summary

Problems solved by technology

However, the existing color image digital watermarking algorithms about wavelet decomposition generally perform DWT decomposition in a certain color space, and embed all or part of the watermark into the intermediate frequency, high frequency or low frequency subbands of the wavelet. These algorithms generally have watermarks The characteristics of small embedding amount and concentrated embedding points weaken the ability to resist geometric attacks such as shearing, and some large-capacity watermarking single-frequency domain sub-band embeddings are too large and easily affect the robustness and invisibility of the carrier image gender balance

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