Image difference quantization watermark embedding method and extraction method, equipment and storage medium

Abstract

The invention discloses an image difference quantization watermark embedding method and extraction method, equipment and a computer readable storage medium, the method utilizes the stability of difference values among certain coefficients in a DCT transform domain to design a difference quantization scheme, and can effectively overcome the defect that the quantization method is difficult to resistscaling attack; the relationship between the quantization threshold and the peak signal-to-noise ratio is theoretically derived; by utilizing the relational expression, the quantization threshold canbe adaptively adjusted according to different carrier images, so that each image can obtain a specified peak signal-to-noise ratio before and after watermark embedding, the robustness of the watermark method is maximized, and meanwhile, the invisibility of the watermark in each image can be ensured. The method provided by the invention is efficient in execution, not only can overcome the defect that a quantization method is difficult to resist scaling attacks, but also can show very good robustness for various common attacks, and can enable all watermarks embedded in an image to obtain good invisibility.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image difference quantized watermark embedding method, extraction method, device and storage medium. Background technique [0002] With the development of Internet multimedia technology, people can easily use digital devices to produce, process and store media information such as text, images, voice and video, and make the release and transmission of information "digital" and "networked". Compared with analog technology, digital multimedia technology has brought innumerable advantages, but it also leads to the security problems of digital information transmission and the copyright protection problems of digital products. Digital copyright protection technology is an important part of my country's informatization construction. In the "National "Eleventh Five-Year" Cultural Development Plan", "digital copyright protection technology" is listed as the focus of sc...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above technical problems, that is, in order to solve the problem that the quantization method is difficult to resist scaling attacks and the use of a fixed quantization threshold cannot take into account the robustness and invisibility, the present invention proposes an image difference quantization watermark embedding method, extraction method, Equipment and storage media

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