Digital image watermark method based on visual attention mechanism

Abstract

The invention discloses a digital image watermark method based on a visual attention mechanism. The digital image watermark method comprises the following steps of: firstly partitioning an image remarkable area by a visual attention mechanism module, obtaining a high-frequency area relative to the remarkable area by wavelet transform, continuously carrying out watermark embedding on dithering quantification modulation of coefficients of the high-frequency area, and dynamically regulating quantified step length depending on a JND (just noticeable difference) visual module in a quantification modulation process. Through the digital image watermark method based on the visual attention mechanism, disclosed by the invention, the step length is dynamically quantified and the watermark is embedded by combining the characteristics of human vision; when the robustness of the watermark is stabilized, the imperceptibility of the watermark is greatly balanced; and simultaneously, the influence of an image background area subjected to operations, such as filtering, noise pollution and the like, in the correctness of a watermark extracting result is further reduced to a certain extent by the introduction of a vision attention mechanism module; and the robustness of watermark detection is further improved.

Description

technical field [0001] The invention relates to a digital image watermarking method based on a visual attention mechanism, so as to carry out copyright protection and authentication on digital images, and belongs to the technical field of information hiding. Background technique [0002] With the rapid development of data storage and Internet network technology, traditional multimedia information, such as digital images, audio, video, etc., are developing in the direction of digitalization, and have been widely used and disseminated. However, at the same time, the increasingly rampant illegal piracy and malicious tampering have caused huge property losses and intellectual property disputes to the society. As an effective supplement to cryptography and digital signature, digital watermark technology is used for copyright protection of digital products. It has become a research hotspot in recent years. The digital image watermark authentication process in the existing technolo...

AI Technical Summary

Problems solved by technology

At the same time, it is also considered that for an image, there are often many background parts, especially for images with a simple background. Most of the existing watermarking algorithms perform watermark embedding on the entire image to easily reduce the quality of the image, and filtering, Operations such as noise pollution, the interference to the background part will greatly affect the correctness of the watermark extraction results

Furthermore, in the face of an image, people are often only interested in a part of the region, but this region (that is, the salient region) carries the most important part of the entire image information. If the image is processed, the region's The quality drops, and the picture loses its viewing value

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