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Spatial domain adaptive color image blind watermarking method based on Slant transform

A color image, self-adaptive technology, applied in the direction of image data processing, image data processing, instruments, etc., can solve the problems of carrier image increase, color watermarking method real-time and security difficult to guarantee, etc.

Active Publication Date: 2020-11-03
上海瑞盛联信息科技有限公司
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Problems solved by technology

[0002] With the rapid development of network technology, color digital images are more and more popular because of their beauty and large capacity. At the same time, illegal infringements such as plagiarism, fabrication and plagiarism are also emerging. The rapid development has greatly increased the possibility of the carrier image being attacked by conventional attacks and geometric attacks, and the robustness of the color watermarking algorithm is facing severe challenges; at the same time, the progress of computer technology and mathematical theory has made the large-capacity color watermarking method real-time and safe. sex is difficult to guarantee

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  • Spatial domain adaptive color image blind watermarking method based on Slant transform
  • Spatial domain adaptive color image blind watermarking method based on Slant transform
  • Spatial domain adaptive color image blind watermarking method based on Slant transform

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Embodiment Construction

[0068]The object of the present invention is to provide a kind of spatial adaptive color image blind watermarking method based on Slant transform, it is characterized in that realize through 4 processes, specifically comprise pretreatment process, watermark embedding process, image correction process and watermark extraction process:

[0069] Process 1: Preprocessing process, the specific steps are described as follows:

[0070] Step 1: Preprocessing of the color carrier image: for a 3D color carrier image with a size of 512×512×3 H Perform dimensionality reduction processing to obtain three two-dimensional layered carrier images of red, green, and blue H p , and divide the pixels in each layer into 2×2 non-overlapping pixel blocks, p =1, 2, 3 represent the red, green and blue layers respectively;

[0071] Step 2: Preprocessing of color watermark images: for 3D color watermark images with a size of 32×32×3 W For dimensionality reduction processing, three two-dimensional la...

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Abstract

The invention discloses a spatial domain adaptive color image blind watermarking method based on Slant transform by combining a Slant transform theory and an integer pairing theory. Firstly, the maximum energy coefficient of a coefficient matrix obtained after Slant transformation is directly solved in an airspace according to watermark capacity, a self-adaptive watermark coding mode and Slant transformation characteristics, the coefficient is quantized to complete embedding of the color watermark, and the method has good concealment and large watermark capacity; Secondly, the step length canbe adaptively quantified according to the size of the image, the geometric attributes of the attacked image can also be utilized to correct the images of various attacks, and the robustness of geometric attack resistance is high. A plurality of integer keys can be encrypted into a large integer and steganographically written into the file structure of the image, so that the security is relativelyhigh. The invention is suitable for occasions of efficient color digital image copyright protection with high safety, good concealment, strong robustness and large watermark capacity.

Description

technical field [0001] The invention belongs to the field of network space security and relates to the copyright protection of color digital images as watermarks. Background technique [0002] With the rapid development of network technology, color digital images are more and more popular because of their beauty and large capacity. At the same time, illegal infringements such as plagiarism, fabrication and plagiarism are also emerging. The rapid development has greatly increased the possibility of the carrier image being attacked by conventional attacks and geometric attacks, and the robustness of the color watermarking algorithm is facing severe challenges; at the same time, the progress of computer technology and mathematical theory has made the large-capacity color watermarking method real-time and safe. Sex is hard to guarantee. Therefore, how to design an efficient color image digital watermarking algorithm with high security, good concealment, strong robustness, and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0028
Inventor 苏庆堂刘得成王环英袁子涵张雪婷陈思宇孙叶函
Owner 上海瑞盛联信息科技有限公司
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