Reversible robust watermarking method based on Zernike moment geometric attack resistance

Abstract

The invention discloses a reversible robust watermarking method based on Zernike moment geometric attack resistance. The method comprises the following steps: calculating a Zernike moment of an original image, carrying out watermark embedding by adopting a quantization watermark method, processing distortion information existing in a Zernike forward and reverse transformation process, and judgingwhether the image is attacked or not; when judging that the image is not attacked, extracting distortion information by adopting a reversible watermarking method, extracting a quantitative watermark by utilizing a Zernike moment of the image, and recovering the original image; and when it is judged that the image is attacked, calculating a Zernike moment of the attacked image with the watermark information, and performing quantitative watermark extraction to obtain the watermark information. According to the method, the problem that reversible robust watermarking cannot be achieved due to thefact that a large number of accumulative errors exist in the Zernike moment transformation process is solved, watermarking can be extracted and an original image can be recovered when the image is notattacked, watermarking can be effectively extracted when the image is attacked, and higher robustness is achieved for geometric attack and conventional signal processing.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a reversible robust watermarking method based on Zernike moments against geometric attacks. Background technique [0002] In recent years, by studying the correlation relationship between image pixels, it is found that there is redundancy. Using this redundancy, a reversible watermarking technology is proposed, which can accurately restore the original image after extracting the watermark. However, in practical applications In the scene, the transmitted image is often attacked (such as: noise, geometric attack, etc.), and the reversible watermarking technology cannot resist such attacks; [0003] On the other hand, the existing Zernike moment transformation technology has a large amount of accumulated errors in the implementation process, and there is distortion in the process of processing, so the reversible robust watermarking technology cannot be realized through ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects and deficiencies in the prior art, the present invention provides a reversible robust watermarking method based on Zernike moments against geometric attacks, by processing the quantization distortion, watermark distortion, overflow distortion and transformation distortion existing in the watermark embedding process , to solve the problem that there is a large amount of accumulated errors in the Zernike moment transformation process and cannot achieve reversible robust watermarking. It can extract the watermark and restore the image when it is not attacked, and can effectively extract the watermark when it is attacked. It can authenticate the integrity of digital media It has a significant effect and can effectively resist a variety of attacks, such as JPEG compression, stretching, rotation, Gaussian noise and salt and pepper noise, etc.

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