Reversible watermarking method and device based on human vision system

Abstract

The embodiment of the invention discloses a reversible watermarking method and device based on a human vision system. The method comprises the following steps: dividing an original image into a texture complex block, a common block and a smooth block according to a preset first threshold value, a second threshold value greater than the first threshold value and the local complexity of each matrixblock of the original image; calculating the prediction error of the maximum pixel value, the second maximum pixel value, the minimum pixel value and the second minimum pixel value of each common block and each smooth block by adopting a pixel value prediction error method for calculating the prediction error of the second maximum pixel value based on the relative position relation of the maximumpixel value and the second maximum pixel value; embedding watermark information into each common block by adopting an ipvo watermark embedding method according to the calculated prediction error; andembedding watermark information into each smooth block by adopting a corresponding relation between a preset prediction error value and an embedded watermark pixel value to obtain a watermark embeddedimage. According to the method and the device, prediction is more accurate, and reversible watermark processing of embedding distortion introduced by gray level translation can be effectively reduced.

Description

technical field [0001] The embodiments of the present invention relate to the field of multimedia signal processing, in particular to a method and device for reversible watermarking based on the human visual system. Background technique [0002] With the enhancement of anti-counterfeiting and copyright awareness, information hiding technology has been developed rapidly. As an effective method to protect information security, realize anti-counterfeiting traceability, and copyright protection, digital watermarking technology is more and more widely used. [0003] Digital watermarking technology is to embed some identification information (that is, digital watermark) directly into digital carriers (including multimedia, documents, images, software, etc.) or indirectly represent (modify the structure of a specific area), without affecting the use value of the original carrier. It is also not easy to be detected and modified again. But it can be identified and identified by the ...

AI Technical Summary

Problems solved by technology

[0006] However, because only the neighborhood pixels are not enough to accurately reflect the real local environment of the matrix block, the method of using the neighborhood pixels of the matrix block to evaluate the neighborhood complexity of the matrix block cannot be accurate and accurate. Efficient implementation of reversible processing of watermarks

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