Efficient reversible data hiding for VQ-compressed images based on index mapping mechanism
Efficient reversible data hiding for VQ-compressed images based on index mapping mechanism
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DOI：
10.1016/j.sigpro.2013.03.036
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Chuan Qin;Chinchen Chang;Yen-Chang Chen
中科院分区：
文献类型：
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作者：
Chuan Qin;Chinchen Chang;Yen-Chang Chen
本文提出了一种基于索引映射机制的矢量量化压缩图像索引表可逆数据隐藏方案。在发送端，利用图像索引表中出现次数为零的矢量量化索引和出现次数最多的索引构造一系列索引映射。每个构造的映射中的索引对应于具有映射比特数的长度的全二进制表示。通过索引直方图的映射优化，可以得到最优的映射比特数向量，从而达到最大的隐藏容量。数据嵌入过程可以很容易地实现简单的索引替换根据当前隐藏的秘密比特的子集。在接收端重构相同的索引映射，保证了秘密数据提取的正确性和索引表的无损恢复。实验结果证明了该方案的有效性。
In this paper, we propose a novel reversible data-hiding scheme in the index tables of the vector quantization (VQ) compressed images based on index mapping mechanism. On the sender side, the VQ indices with zero occurrence numbers in a given index table of an image are utilized to construct a series of index mappings together with some indices with the largest occurrence numbers. The indices in each constructed mapping correspond to the full binary representations with the length of the mapping bit number. Through the mapping optimization by index histogram, the optimal vector of mapping bit numbers can be obtained, which leads to the highest hiding capacity. Data embedding procedure can be easily achieved by the simple index substitutions according the current subset of secret bits for hiding. The same index mappings reconstructed on the receiver side ensure the correctness of secret data extraction and the lossless recovery of index table. Experimental results demonstrate the effectiveness of the proposed scheme.