A simple image encoding method with data lossless information hiding

Authors:
Zhi-Hui Wang;Chin-Chen Chang;Ming-Chu Li;Tzu-Chuen Lu
Affiliations:
Dalian University of Technology, Liaoning, China;Feng Chia University, Taichung, Taiwan;Dalian University of Technology, Liaoning, China;Chaoyang University of Technology, Taichung, Taiwan
Venue:
Proceedings of the 4th International Conference on Uniquitous Information Management and Communication
Year:
2010

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Abstract

In this paper, we propose a simple reversible data hiding method in the spatial domain for block truncation coding (BTC) compressed grayscale images. The BTC method compresses a block of a grayscale image to a bitmap and a pair of quantization numbers. The proposed method first embeds secret bits into a block by changing the order of those two quantization numbers. The compression rate is not enlarged by this embedding scheme. To further improve the hiding capacity, the proposed method embeds the secret bits into the bitmap of the block by exploiting the correlation characteristic of neighboring blocks' bitmap in natural images. The experimental results show that the proposed method achieves very good hiding capacity at low compression rate.