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A Blind Watermarking Method for Two-Color Image Based on Matrix Lu Decomposition

A dual-color image, blind watermark technology, applied in the field of information security, can solve problems such as cumbersome and inconvenient

Inactive Publication Date: 2017-11-10
LUDONG UNIVERSITY
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Problems solved by technology

However, this type of technology needs the help of the original host image or the original watermark image to detect or extract the watermark, which is somewhat cumbersome and inconvenient in real life

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  • A Blind Watermarking Method for Two-Color Image Based on Matrix Lu Decomposition
  • A Blind Watermarking Method for Two-Color Image Based on Matrix Lu Decomposition
  • A Blind Watermarking Method for Two-Color Image Based on Matrix Lu Decomposition

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Embodiment Construction

[0034] The purpose of the present invention is to provide a dual-color image blind watermarking method based on matrix LU decomposition, including a watermark embedding process and an extraction process, and the specific process of its watermark embedding is described as follows:

[0035] The first step: preprocessing of color digital watermark image: Watermark image of 24-bit original color image with size 32×32 W Divided into three two-dimensional watermark components through dimensionality reduction R , G , B ; Then, each two-dimensional watermark component is based on the private key KA c ( c =1,2,3) Arnold transform scrambling; then, each pixel value is converted into an 8-bit binary number, and all 8-bit binary arrays are combined into a binary sequence W c , c =1,2,3 represent red, green, and blue respectively; for example: 241, 198, and 201 can be converted into binary numbers as 11110001, 11000110, and 11001001 respectively, and the binary sequence of combinin...

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Abstract

The invention discloses a double-color image blind watermarking algorithm, which aims to change the current situation that the current digital watermarks are mostly binary or grayscale images, and meet the requirement of color digital images as copyright protection. The technical point is to decompose the 4×4 pixel block into matrix LU, and embed the color digital image watermark into the color host image by fine-tuning the size relationship between the elements in the second row and column of the lower triangular matrix and the elements in the third row and column At the same time, the extraction of the watermark does not require the help of the original watermark or the original host image, so as to achieve the purpose of blind extraction. The method is simple and fast, has high watermark invisibility and strong robustness, and is suitable for copyright protection of color 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] With the rapid development of Internet and multimedia technology, illegal copying of digital works, malicious tampering of copyright protection signs, etc. have become more and more serious problems to be solved urgently. Most of the current image digital watermarking algorithms use binary or grayscale images as digital watermarks, but few use color images as digital watermarks. One of the most important reasons is that when a color image is used as a digital watermark, the amount of information it contains is 3 times that of a grayscale image of the same size and 24 times that of a binary image, which increases the difficulty of watermark embedding. The digital watermarking technology of embedding grayscale images into value images cannot satisfy the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 苏庆堂王刚刘启明邓冠龙吕高焕
Owner LUDONG UNIVERSITY
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