Watermark embedding and image self-recovery method based on reference matrix and LSB replacement

Abstract

The invention discloses a watermark embedding and image self-recovery method based on a reference matrix and LSB (least significant bit) replacement, which belongs to the technical field of digital watermarking, and comprises the following steps of: acquiring an original image in real time, and dividing the image into subblocks with the size of 4 * 2 or 2 * 4 by adopting a block division method; generating a recovery bit, a flag bit and an authentication bit of the watermark; embedding the watermark into the original image based on the reference matrix and the LSB replacement; extracting the watermark based on the reference matrix and the LSB, and recalculating a recovery bit and an authentication bit; tampering detection is divided into two stages, the first stage is based on the extracted authentication bit and the recalculated authentication bit through comparison, and the second stage is based on the extracted recovery bit and the recalculated recovery bit through comparison; and recovering the tampered sub-block by using the recovery bit, and finally obtaining a recovered image. The reference matrix comprises a first reference matrix and a second reference matrix. According to the invention, the balance among the visual quality of the watermark image, the performance of tampering detection and the visual quality of the recovered image is realized.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking, in particular to a watermark embedding and image self-recovery method based on reference matrix and LSB replacement. Background technique [0002] Today, more and more important work is done on the Internet. The integrity and security of data transmission is particularly important. Images, as a kind of data, are vulnerable to malicious or accidental attacks during transmission, such as cutting, copy-pasting, compression, etc. Therefore, watermarking technology is used for copyright protection. With the deepening of image research by researchers, some other applications of watermarking have gradually emerged, such as bill anti-counterfeiting, prevention of illegal theft, tampering detection and positioning, and flexible restoration of images. [0003] In most of the existing algorithms, the more watermark information is embedded, the more accurate the detection and location of the ...

AI Technical Summary

Problems solved by technology

On the other hand, as the watermark embedding capacity increases, the imperceptibility of the watermark becomes worse, and many existing self-healing schemes cannot achieve the compromise between watermark embedding capacity and watermark image quality

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