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A Robust Color Image Watermarking Method Based on Combination Domain

A color image, combined domain technology, applied in the field of information security

Inactive Publication Date: 2018-10-12
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the transform domain and the space domain have different advantages, they are widely used in digital watermarking; however, most of the existing digital watermarking methods are implemented in a single transform domain or space domain, without combining the advantages of both. Combined

Method used

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  • A Robust Color Image Watermarking Method Based on Combination Domain
  • A Robust Color Image Watermarking Method Based on Combination Domain
  • A Robust Color Image Watermarking Method Based on Combination Domain

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Embodiment Construction

[0050] The purpose of the present invention is to provide a method for robust color image watermarking based on combined domains, including specific watermark preprocessing, watermark embedding and watermark extraction processes, and its watermark preprocessing process is described as follows:

[0051] The first step: the original watermark with a size of 32×32 W Split into 4 embedded sub-watermarks of size 32×8 , in ;

[0052] Step 2: Embed each sub-watermark key-based K p Pseudo-random scrambling of the hash to improve the security of the watermark;

[0053] The specific process of watermark embedding is described as follows:

[0054] Step 1: Obtain a host image with a size of 512×512 I blue component of B , and put the blue component based on the key Key1 B Split into non-overlapping image blocks of size 128×128 ,in, ;

[0055] Step 2: Divide each image into blocks Divide into non-overlapping pixel sub-blocks of size 8×8 ,in i , j Respectively repres...

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Abstract

The invention discloses a color image watermarking algorithm with good robustness. The color image watermarking algorithm combines the advantages of a spatial-domain watermarking method and a frequency domain watermarking method, aims to improve the instantaneity and the robustness of a digital watermarking method, and satisfies a requirement of color digital image copyright protection. The color image watermarking algorithm is characterized by blocking the blue component of a color host image; acquiring the DC coefficient and the modified value thereof of each 8*8 pixel child block in each block in the spatial domain according to a DC coefficient forming principle in the DCT domain; and then modifying the DC coefficient in the DCT domain to embed a watermark by directly modifying the size of a pixel in the spatial domain; repeating 4 times to embed the child watermarks into the image blocks on the basis of the original watermark blocks; not requiring the original watermark or the original host image in watermark extraction; determining optimum extracted child watermarks by using a majority principle; and combining the child watermarks to form a complete extracted watermark. The color image watermarking algorithm is simple and convenient, good in robustness, and suitable for copyright protection of the color image used as the host image.

Description

technical field [0001] The invention belongs to the technical field of information security, and uses a fast and robust digital watermarking method to protect the copyright of digital images. Background technique [0002] With the rapid development of Internet and multimedia technology, the illegal copying of digital works and malicious tampering of copyright have become more and more serious problems to be solved urgently. The digital watermarking technology used for digital copyright protection has attracted more and more attention. According to the different embedding position of digital watermark, it can be divided into transform domain digital watermark and space domain digital watermark. Transform domain digital watermarking generally transforms the image into the transform domain and embeds the watermark by modifying its transform coefficients. Its main advantage is that it has strong robustness; while spatial domain digital watermarking usually embeds watermarks into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/005
Inventor 苏庆堂王环英巩艳华薛梅王兆粼张岐同
Owner LUDONG UNIVERSITY
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