基于动态块划分和预测误差对扩展的可逆信息隐藏
Reversible data hiding based on dynamic pixel block partition and pairwise prediction-error expansion
投稿时间:2017-10-12  修订日期:2017-10-12
DOI:
中文关键词: 可逆信息隐藏  动态块划分  预测误差对扩展  像素排序
英文关键词: Reversible data hiding  Pixel-value ordering  Pairwise prediction-error expansion  Dynamic block partition
基金项目:国家自然科学基金资助项目(60975021)
作者单位E-mail
熊志勇 中南民族大学 zhiyx@scuec.edu.cn 
李彪 中南民族大学 Bia_l@outlook.com 
王江晴 中南民族大学  
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中文摘要:
      为提高含密图像质量,提出一种基于动态像素块划分和预测误差对扩展的可逆信息隐藏算法。通过局部区域纹理复杂度计算对图像进行动态二次分块,运用像素排序算法计算预测误差并生成相应的预测误差对,最后通过预测误差对扩展嵌入秘密信息。动态像素块划分充分利用图像平滑区域进行信息嵌入提高算法整体性能,预测误差对扩展丢弃失真较大的像素对扩展方向进一步减小图像失真,实验结果表明,本文算法与近期同类算法相比性能更优。
英文摘要:
      Recently, various efficient reversible data-hiding schemes based on pixel value ordering have been proposed for embedding message into high-fidelity images. In these schemes, after dividing the cover image into equal-sized blocks, pixel-value-ordering technique is used to modify the maximum and minimum pixel values of each block for reversible data hiding. In order to improve the image quality, this paper proposes a reversible information hiding algorithm based on dynamic block partitioning and pairwise prediction-error expansion. Firstly, through the local region texture complexity calculation, the image is dynamically divided into two-sized blocks. Specifically flat image areas are preferentially divided into small blocks to retain high embedding capacity, whereas rough areas are divided into larger blocks to avoid decreasing peak signal-to-noise ratio. Then we discuss the PVO embedding in two-dimensional space and utilizes the prediction-error pair within a block for data embedding. The PVO embedding is extended into a 2D form by integrating the pairwise prediction-error expansion, and a new reversible 2D mapping which discards larger distortion spreading directions is proposed. Experimental results show that the proposed method outperforms the previous PVO-based method.
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