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Color Image Blind Watermarking Method Based on Ternary Code

A color image and ternary technology, applied in the field of information security, can solve the problems of reducing the invisibility of watermarks, embedding and extracting difficulties, etc.

Inactive Publication Date: 2017-10-27
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] With the improvement of people's awareness of copyright protection, the signs used for copyright protection are changing from traditional pseudo-random sequences, binary images, and grayscale images to meaningful color images; however, most of the watermarking methods that have been proposed so far are aimed at For grayscale images, the research on digital watermarking methods for color images is less, mainly because grayscale images are easier to process than color images, and grayscale images only contain luminance information without chrominance information, embedding watermarks in them will not Generate new color components; when embedding a color image digital watermark with a large amount of information, it will be more difficult to encode, embed and extract the watermark, which reduces the invisibility of the watermark

Method used

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  • Color Image Blind Watermarking Method Based on Ternary Code
  • Color Image Blind Watermarking Method Based on Ternary Code
  • Color Image Blind Watermarking Method Based on Ternary Code

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Embodiment Construction

[0035] The purpose of the present invention is to provide a color image blind watermark method with ternary representation of copyright information, including watermark embedding process and extraction process, and describe its watermark embedding process as follows by example:

[0036] Step 1: Digitally watermark the 32×32 24-bit 3D color image through dimensionality reduction W It is divided into three two-dimensional layered watermark images of red, green, and blue; in order to improve the security of the watermark, the layered watermark image is based on Ka Arnold transform, and each pixel expressed in decimal is represented by 6-digit ternary numbers, and combined in turn to form a hierarchical watermark sequenceW i , i =1, 2, 3 represent the red, green, and blue layers respectively. For example, the pixel values ​​188, 63, and 9 can be converted into ternary numbers 020222, 002100, and 000100 respectively;

[0037] Step 2: 24-bit original host image of 512×512 H Split...

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Abstract

The invention discloses a color image blind-watermarking method. A color image for copyright protection is subjected to ternary coding and serves as a digital watermark to be embedded into a color parasite image. The embedded color image watermark has good invisibility and meets the requirement for copyright protection based on color image identification. According to the method, each 4*4 pixel block is subjected to QR decomposition, and the watermark is embedded by modifying the value of the element in the first column and the second row and the value of the element in the first column and the third row in an orthogonal matrix Q of the image; after the image containing the watermark is attacked, the embedded watermark is extracted according to the relation between the modified elements in the orthogonal matrix Q of the image, and the purpose of blind detection is achieved. The color image blind-watermarking method has good watermarking algorithm performance and is suitable for copyright protection with the color digital image as the digital watermark.

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] With the improvement of people's awareness of copyright protection, the signs used for copyright protection are changing from traditional pseudo-random sequences, binary images, and grayscale images to meaningful color images; however, most of the watermarking methods that have been proposed so far are aimed at For grayscale images, the research on digital watermarking methods for color images is less, mainly because grayscale images are easier to process than color images, and grayscale images only contain luminance information without chrominance information, embedding watermarks in them will not Generate new color components; and when embedding a color image digital watermark with a large amount of information, there will be greater difficulty in wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 苏庆堂曲文强李涛巩艳华薛梅
Owner LUDONG UNIVERSITY
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