A Reversible Information Hiding Method Based on Block Prediction and Difference Histogram Translation

Abstract

The invention discloses a reversible information hiding method based on block prediction and difference histogram translation, which belongs to the field of digital watermarking and information hiding. The method of the invention first divides the image into 4*4 image blocks, and then performs three-neighborhood Blocking, every four pixels as a group, select a pixel and its surrounding three pixels, use the surrounding three pixels to generate a predicted value, use the predicted value to compare with the selected pixel, generate a difference, and the difference is carried down Rounding to an integer, four difference values ​​are generated in one image block, and then a difference value histogram is generated. The invention improves the embedding capacity of the watermark, simplifies the algorithm steps on the premise of maintaining the visual effect of the image, and only needs to be divided into blocks before embedding and extracting the watermark; the method can not only realize the reversible watermark, but also make the watermark invisible Better, the experiment is simple and easy, the PSNR of the image after embedding the watermark is high, the visual effect of the image is good, and it has practical value.

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 ...

AI Technical Summary

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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