Dual-color image blind watermarking method based on QR decomposition and compensation

A dual-color image, QR decomposition technology, applied in the field of information security

Inactive Publication Date: 2014-03-05
LUDONG UNIVERSITY
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Problems solved by technology

Regrettably, because the copyright protection information contained in color digital images is very large, the non-blind watermarking method can be used to embed or extract the watermark more conveniently. Many existing color image digital watermarking methods study non-blind watermarking. Therefore, How to change the status quo and realize the blind extraction of color watermarked images is one of the difficulties in the current image digital watermarking technology

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  • Dual-color image blind watermarking method based on QR decomposition and compensation
  • Dual-color image blind watermarking method based on QR decomposition and compensation
  • Dual-color image blind watermarking method based on QR decomposition and compensation

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Embodiment Construction

[0054] Step 1: Preprocessing of the color watermark image: Divide a 24-bit original color watermark image W with a size of 32×32 into three watermark components R, G, and B through dimensionality reduction, and divide each watermark component based on The Arnold scrambling transformation of the key Ka; then, each pixel is converted into binary information of 8 bits, and finally combined to form a watermark sequence with a length of 24576 W ;

[0055] Step 2: Block processing of the color host image: in the RGB color space, divide the 512×512 host image H into three layers of R, G, and B images, and divide each layer of images into non-overlapping 4×4 pixels piece;

[0056] The third step: use the MD5 function based on the key Kh to pseudo-randomly select 24576 pixel blocks as the embedding position of the watermark;

[0057] Step 4: Perform QR decomposition on the selected pixel block to obtain its orthogonal matrix Q and upper triangular matrix R;

[0058] Assuming an orig...

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Abstract

The invention discloses a dual-color image blind watermarking method based on QR decomposition and compensation, which aims to change the current situation that the current digital watermarking is mostly a binary or grayscale image and meet the requirement that a color digital image serves as digital watermarking. According to the technical key point, color image watermarking is embedded into an orthogonal matrix Q obtained by QR decomposition; visual distortion caused by watermarking embedding is compensated by utilizing a triangular matrix R; and assistance of the original watermarking or the original host image is not needed during watermarking extraction, so that blind detection is realized. The method is simple and quick, has the advantages of high watermarking invisibility, strong robustness and high capacity, and is applicable to copyright protection of the color digital image serving as the digital watermarking.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to the copyright protection of large-capacity color digital images as digital watermarks. Background technique [0002] Most of the image digital watermarking methods today use binary or grayscale images as digital watermarks, and relatively few use color digital images as digital watermarks. The main reason is that when color digital images are used as watermarks, the amount of information contained in them is the same. The size of the grayscale image is 3 times that of the binary image, which is 24 times that of the binary image, so it increases the difficulty of watermark embedding; at the same time, the existing digital watermarking method for embedding binary images into grayscale images cannot meet the needs of color digital watermarking. Image-based copyright protection, so how to use color digital images as digital watermarks has become one of the problems to be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 苏庆堂赵云峰贾韶丽
Owner LUDONG UNIVERSITY
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