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With the purpose of improving the visual quality of an original block truncation coding (BTC) compressed image, an optimal modified BTC scheme (OMBTC) is proposed. The binary search tree (BST) technique is utilized to determine the optimal quantization of each image block. The proposed scheme is compared with several existing modification BTC schemes, the experimental results demonstrate that the...
A novel, reversible, data hiding method is presented in this paper. the proposed method focuses on hiding secret data in block truncation coding (BTC) compressed images. Conventionally, each block of an image compressed by BTC is encoded by two representative gray levels and a bitmap. the secret data can be embedded according to the order of each pair of gray levels. Moreover, we generated the histogram...
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