计算机应用 ›› 2015, Vol. 35 ›› Issue (7): 1908-1914.DOI: 10.11772/j.issn.1001-9081.2015.07.1908

• 信息安全 • 上一篇    下一篇

结合均值调整整数变换的迭代自适应可逆图像水印算法

陈文鑫, 邵利平, 师军   

  1. 陕西师范大学 计算机科学学院, 西安 710119
  • 收稿日期:2015-02-11 修回日期:2015-04-09 出版日期:2015-07-10 发布日期:2015-07-17
  • 通讯作者: 邵利平(1978-),男,山东东明人,副教授,博士,CCF会员,主要研究方向:信息隐藏、图像分存、图像加密、图像伪装、稀疏表示,slpmaster@163.com
  • 作者简介:陈文鑫(1992-),男,江西丰城人,硕士研究生,CCF会员,主要研究方向:大容量可逆数字水印; 师军(1957-),男,河北保定人,副教授,主要研究方向:信息隐藏、智能信息处理。
  • 基金资助:

    国家自然科学基金资助项目(61100239);教育部高等学校博士学科点专项科研基金资助项目(20110202120002);陕西省科技新星计划资助项目(2011kjxx17);陕西省自然科学基金资助项目(2011JQ8009);中央高校基本科研业务费支持项目(GK201402036)。

Iterative adaptive reversible image watermarking algorithm combined with mean-adjustable integer transform

CHEN Wenxin, SHAO Liping, SHI Jun   

  1. School of Computer Science, Shaanxi Normal University, Xi'an Shaanxi 710119, China
  • Received:2015-02-11 Revised:2015-04-09 Online:2015-07-10 Published:2015-07-17

摘要:

现有的均值调整整数变换可逆水印算法的阈值需人工选择,位置图生成策略不完备可能导致压缩后位置图数据过大,对嵌入矢量强制划分可能导致容量足够却无法嵌入。针对以上问题,提出一种结合均值调整整数变换的迭代自适应可逆图像水印算法。首先,根据负载数据大小以及整数矢量对峰值信噪比(PSNR)的影响,采用迭代自适应算法选择调整平移量以达到水印嵌入容量和嵌入载体视觉质量的平衡;然后,结合邻近像素值相近原则给出了完备位置图生成策略以提高位置图压缩性能;最后,采用分层有序嵌入策略将负载数据依次嵌入到最低、次低和第3低有效位以避免容量足够却无法嵌入的情况。实验结果表明,与传统均值调整整数变换可逆水印算法相比,所提算法无需预先设定阈值,但依然能保持大的嵌入容量,嵌入水印后掩体视觉质量更优,位置图生成策略性能优于传统均值调整整数变换可逆水印算法生成策略且压缩后的位置图数据更小,从而间接提高了嵌入容量,在实验样例上相对于比较算法,PSNR平均提高14.4%。

关键词: 可逆整数变换, 均值调整整数变换, 峰值信噪比, 嵌入容量, 可逆水印

Abstract:

In the existing reversible watermarking algorithm based on mean-adjustable integer transform, there are following defects such as non-adaptive threshold selecting, incomplete location map building strategy which may lead to poor compression performance and compulsive partition strategy for embedded vectors which may lead to a failure embedding even if embedding capacity is enough. To address these problems, an iterative adaptive reversible image watermarking algorithm combined with mean-adjustable integer transform was proposed. Firstly, according to Peak Signal-to-Noise Ratio (PSNR) affected by the payload data size and integer vector, an iterative adaptive algorithm was used in selecting mean-adjustable offsets to balance the watermarking embedding capacity and the visual quality of embedded carrier; Secondly, based on the strategy that adjacent pixels have similar pixel values, a complete location map generating strategy was proposed to improve location map compression performance; Finally, to avoid failure embedding, the proposed reversible watermarking algorithm adopted hierarchical order embedding strategy to embed payload data in order from the first least significant bits to the third least significant bits. The experimental results show that the proposed algorithm has a big embedding capacity and does not need to preset threshold. Location map building strategy has a better performance in making location map data in smaller size and increasing the capacity indirectly compared with the reversible watermarking algorithm based on mean-adjustable integer transform, and the PSNR increases by 14.4% averagely in experimental sample.

Key words: reversible integer transform, mean-adjustable integer transform, Peak Signal-to-Noise Ratio (PSNR), embedding capacity, reversible watermarking

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