Full frequency domain sub-band digital watermarking embedding method based on wavelet decomposition

Abstract

The invention discloses a full frequency domain sub-band digital watermarking embedding method based on wavelet decomposition, comprising the steps of conducting first-level wavelet decomposition on a color host image Y component; conducting equal-area and not-overlapping partition on all the four frequency domain sub bands HH, HL, LH and LL, and selecting embedding blocks from the four frequency domains according to rules at random to form a full frequency domain embedding block array B; conducing LU decomposition on the embedding blocks and selecting diagonal matrix to conduct SVD decomposition; dividing gray-scale watermarking images into p*p blocks after scrambling in a equal-area and non-overlapping manner, and conducting SVD decomposition on each watermarking block; modifying the singular value of the carrier block and completing the circular embedding of watermarks. At the time of extracting watermarks, a complete watermark information can be obtained by selecting any continuous p*p embedding blocks in the embedding array. The full frequency domain sub-band digital watermarking embedding method based on wavelet decomposition is advantageous in that geometric attack like shearing, brightness adjusting, high pass filtering, lossless compression and zooming can be effectively defended; under the prerequisite that high-capacity embedding of watermarks is guaranteed, the relation between the invisibility and robustness can be balanced; the full frequency domain sub-band digital watermarking embedding method is suitable for the 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

Images