A Secret Information Hiding Scheme Based on Switching Tree Coding
Vector quantization (VQ) is an efficient lossy image compression approach based on the principle of block coding. In a VQ system, a host image is transformed into a series of indices. In order to improve the compression rate, switchingtree coding (STC) was designed to encode the output codevector indices. In this paper, we propose a novel lossless hiding scheme. When this scheme is used, information is hidden in STC compressed codes to broaden the efficiency of the compressed codes. According to the experimental results, we find that information can be efficiently hidden in the indices without the content being modified. After decoding, the hidden information and the indices can be obtained. Only a small number of extra bits are needed to record the hidden information.
Keywordsdata compression information hiding vector quantization switching-tree coding
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