计算机工程 ›› 2011, Vol. 37 ›› Issue (18): 148-150.doi: 10.3969/j.issn.1000-3428.2011.18.049

• 安全技术 • 上一篇    下一篇

基于DCT域和纹理复杂度的图像水印算法

王 静,王 冰   

  1. (西北大学信息科学与技术学院,西安 710127)
  • 收稿日期:2011-04-12 出版日期:2011-09-20 发布日期:2011-09-20
  • 作者简介:王 静(1984-),女,硕士研究生,主研方向:图像处理,数字水印;王 冰,教授
  • 基金项目:
    陕西省科技攻关计划基金资助项目(200405-G25)

Image Watermark Algorithm Based on DCT Domain and Texture Complexity

WANG Jing , WANG Bing   

  1. (School of Information and Technology, Northwest University, Xi’an 710127, China)
  • Received:2011-04-12 Online:2011-09-20 Published:2011-09-20

摘要: 水印的鲁棒性受背景、纹理、边缘等条件影响较大。为此,提出基于离散余弦变换(DCT)域和纹理复杂度的图像水印算法。对水印信息进行预处理,计算每个图像块的方差并将其按大小排序,对各子块进行离散余弦变换,计算变换后每个图像块的方差并将其按大小排序,根据中频系数将经过方差值排序的水印图像块嵌入载体图像中。测试结果表明,该算法比原始基于DCT的水印算法具有更好的鲁棒性和图像可见性。

关键词: 离散余弦变换, 纹理复杂度, 水印图像, 鲁棒性

Abstract: The robustness of watermark is largely influenced by texture of image background, texture, edge and so on. This paper proposes an image watermark algorithm based on Discrete Cosine Transformation(DCT) domain and texture complexity, including preprocessing the watermark information, and calculating each image block’s variance and sort the value, then transferred by DCT. It also calculates each varied image block’s variance and sorts the value. It insets the watermark image block which goes through the variance yields sort into the carrier image. Experimental results show that the algorithm compared with the primitive DCT-based transformed watermark algorithm has great robustness and invisibility.

Key words: Discrete Cosine Transformation(DCT), texture complexity, watermark image, robustness

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