Digital image watermarking method based on visual perception characteristics

Abstract

A digital image watermarking method based on visual perception characteristics provided by the invention relates to the technical field of information hiding and digital watermarking in multimedia information security, and mainly comprises the following five steps: preprocessing a digital image watermark; extracting an important region; creating a visual perceptual model; embedding the digital image watermark; and detecting the digital image watermark. A specific flow comprises the following steps: firstly, mapping a carrier image into a geometrical invariant space by using an image normalization method based on moment, and determining the important region in the normalized image by combining an invariant centroid theory; and then, establishing the visual perceptual model according to the visual perception characteristics; and finally, combining the visual perceptual model, and using a special adaptive quantization modulation policy to adaptively embed a 256-bit readable watermark in a DFT (discrete Fourier transformation) area of the important region. An original carrier is unnecessary for extracting out the watermark, so that blind detection is realized well. The method is not only good in transparency, but also has better robustness.

Description

technical field [0001] The digital image watermarking method based on visual perception characteristics of the present invention relates to the technical field of information hiding and digital watermarking in multimedia information security, and specifically relates to a digital image watermarking method based on human visual perception. Background technique [0002] At present, digital watermarking (Digital Watermarking), as an effective supplementary method to traditional encryption methods, is a new technology that can protect copyright and authentication source and integrity in an open network environment. a hotspot of research. The so-called digital image watermark is to hide a mark (watermark) with a specific meaning in a digital image product by means of data embedding, so as to prove the creator's ownership of his work and serve as a basis for identification and prosecution of illegal infringement. Through the detection and analysis of the watermark to ensure the i...

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Problems solved by technology

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to study and design a novel digital image watermarking method based on visual perception characteristics, so as to solve the research that the existing digital image watermarking technology will focus on robustness, and to Algorithms that balance the robustness and imperceptibility of digital watermarking are rarely studied

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