An improved color image watermarking algorithm based on QR decomposition
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- 作者：Qingtang Su ; Gang Wang ; Xiaofeng Zhang ; Gaohuan Lv…
- 关键词：Color watermark image ; Matrix decomposition ; Orthogonal matrix ; Robustness
- 刊名：Multimedia Tools and Applications
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：76
- 期：1
- 页码：707-729
- 全文大小：
- 刊物类别：Computer Science
- 刊物主题：Multimedia Information Systems; Computer Communication Networks; Data Structures, Cryptology and Information Theory; Special Purpose and Application-Based Systems;
- 出版者：Springer US
- ISSN：1573-7721
- 卷排序：76
文摘
Most of the existing color image watermarking schemes use binary or grayscale image as watermark, and many of them belong to non-blind watermarking methods. In this paper, an improved color image watermarking algorithm based on QR decomposition is proposed to embed color watermark image into color host image. For embedding watermark, the 24-bits color host image is divided into non-overlapping 3 × 3 pixel blocks and each pixel block is decomposed by QR decomposition, and the 24-bits color watermark image is embedded into the color host image by modifying the relation between the second row first column coefficient and the third row first column coefficient of the orthogonal matrix Q. For extracting watermark, only the watermarked image is needed. Experimental results show that the proposed color image scheme not only has better watermark performance such as invisibility, robustness, security, capacity, and computation complexity, but also overcomes the false-positive detection problem.