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A Blind Watermarking Method for Two-Color Image Based on qr Decomposition and Compensation

A dual-color image, QR decomposition technology, applied in the field of information security, to achieve the effects of strong robustness, high watermark invisibility, and large capacity

Inactive Publication Date: 2016-08-17
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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  • A Blind Watermarking Method for Two-Color Image Based on qr Decomposition and Compensation
  • A Blind Watermarking Method for Two-Color Image Based on qr Decomposition and Compensation
  • A Blind Watermarking Method for Two-Color Image Based on qr Decomposition and Compensation

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Embodiment Construction

[0049] The first step: preprocessing of the color watermark image: a 24-bit original color watermark image W with a size of 32×32 is divided into three watermark components R, G, and B through dimensionality reduction, and each watermark component is based on The Arnold scrambling transformation of the key Ka; then, convert each pixel into 8 bits of binary information, and finally combine to form a watermark sequence W with a length of 24576;

[0050] 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;

[0051] 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;

[0052] Step 4: Perform QR decomposition on the selected pixel block to obtain its orthogonal matrix Q and upper triangular matrix R;

[0053] Assuming an orig...

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Abstract

The invention discloses a double-color image blind watermarking method based on QR decomposition and compensation, which aims to change the current situation that the current digital watermarks are mostly binary or grayscale images, and meet the needs of color digital images as digital watermarks. The technical point is to embed the color image watermark into the orthogonal matrix Q obtained by QR decomposition, and use its upper triangular matrix R to compensate for the visual distortion caused by embedding the watermark; at the same time, the original watermark or the original host image should not be used when extracting the watermark. With the help of , the purpose of blind detection is achieved. The method is simple and fast, and has high watermark invisibility, strong robustness and large capacity, and the invention is suitable for copyright protection of color digital images as digital watermarks.

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 Patents(China)
IPC IPC(8): G06T1/00
Inventor 苏庆堂赵云峰贾韶丽
Owner LUDONG UNIVERSITY
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