计算机应用 ›› 2010, Vol. 30 ›› Issue (9): 2408-2412.

• 信息安全 • 上一篇    下一篇

基于三分量预测误差差值扩展的可逆数据隐藏

熊志勇,王江晴   

  1. 中南民族大学计算机科学学院
  • 收稿日期:2010-03-24 修回日期:2010-05-18 发布日期:2010-09-03 出版日期:2010-09-01
  • 通讯作者: 熊志勇
  • 基金资助:
    基于数据驱动的故障诊断方法及其应用研究

Reversible data hiding based on prediction error difference expansion of ternary components

XIONG Zhi-yong,WANG Jiang-qing   

  • Received:2010-03-24 Revised:2010-05-18 Online:2010-09-03 Published:2010-09-01
  • Contact: XIONG Zhi-yong

摘要: 针对传统差值扩展存在过分修改像素值、须嵌入定位图等缺陷,提出了一种新的彩色图像可逆数据隐藏算法。首先利用色彩分量之间的相关性减小差值,并根据扩展方向和差值的符号,用较小的差值扩展量修改部分色彩分量的像素值,扩展方向由可能产生上溢和下溢的像素数量决定;其次采用单向像素值调整的方法避免像素值溢出,并用少量的调整信息代替定位图,嵌入容量大幅提高;最后改进差值直方图平移技术控制嵌入容量和图像失真。提取端根据临界像素值的顺序定位调整的像素位置,用调整信息恢复调整的像素值,在提取信息的同时可无损地恢复原始图像。实验结果表明,所提出的算法在大幅提高嵌入容量的同时,仍能保持较高的图像质量。

关键词: 可逆数据隐藏, 三分量, 差值扩展, 预测误差差值扩展, 溢出定位图

Abstract: To avoid the drawback of Difference Expansion (DE) algorithm which must embed a location map and the quality decline of stego-images from excessive modulation to pixels, a reversible data hiding algorithm for color images was proposed. The algorithm made use of correlation of color components to decrease difference and use smaller expansion to change the pixels value of some components. The expansion direction was determined by the quantity of overflow and underflow pixels. The embedding scheme adopted the adjusting method of single direction pixels value to prevent overflow or underflow, and embedded a few adjusting value instead of location map, so the embedding capacity was increased; finally, improved the difference histogram shifting technique to control the capacity and distortion. According to the sequence of critical value, the adjusted pixels value could be restored. The experimental results show the embedding capacity and the quality of stego-image are significantly improved in comparison with other new or classical algorithms.

Key words: reversible data hiding, ternary components, Difference Expansion (DE), prediction error difference expansion, overflow location map

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