Reversible information hiding method based on block prediction and difference value histogram translation

Abstract

The invention discloses a reversible information hiding method based on block prediction and difference value histogram translation. The invention belongs to the field of digital watermarking and information hiding. The reversible information hiding method comprises the following steps: firstly, dividing an image into 4 * 4 image blocks; then, conducting three neighborhood partitioning, wherein every four pixels form one group, selecting one pixel and three pixels on the periphery of the pixel, generating prediction values by using the three pixels on the periphery, comparing the prediction values with the selected pixels so as to generate difference values, enabling the difference values to be subjected to downward rounding, generating four difference values in one image block, and then generating a difference value histogram. According to the reversible information hiding method, the embedding capacity of the watermark is improved, and the algorithm steps are simplified on the premise of keeping the visual effect of the image, and the watermark can be embedded and extracted only by partitioning. According to the reversible information hiding method, reversible watermarking can beachieved, and watermarking invisibility is good, and the experiment is simple and easy to implement, and the PSNR of the image with the embedded watermarking is high, and the image visual effect is good, and the practical value is achieved.

Description

technical field [0001] The invention belongs to the field of digital watermarking and information hiding, in particular to a reversible information hiding method based on block prediction and difference histogram translation. Background technique [0002] With the improvement of people's security awareness and intellectual property awareness, people pay more and more attention to the security of their own information, and the use of digital watermarking technology is also increasing. Image digital watermarking technology can be divided into reversible and irreversible watermarking technology according to whether the embedded watermark image can be restored. In order to protect the integrity of images, reversible watermarking is used more and more. Reversible watermarking, also known as lossless watermarking, is a fragile digital watermarking. It can clearly reflect whether the signal has been tampered with, and can restore the original image losslessly after extracting the ...

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Problems solved by technology

[0003] The watermark embedding method of the document "NI Z, SHI Y Q, ANSARI N, et al. Reversible data hiding" (IEEE Transon Circuits and Systems for Video Technology-nology, 2006, 16: (3) 354-362.), the algorithm is easy to implement , the capacity of the embedding also mainly depends on the peak point, but when used in an image with balanced pixel values, the peak point is not prominent, so the effect of this algorithm is not good

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