High capacity reversible data hiding in AMBTC-compressed images

This paper proposes a high capacity reversible data hiding scheme in images compressed by absolute moment block truncation coding (AMBTC). The quantization levels of compressed blocks are employed as cover media, and some extra confidential data are hidden in it based on a multilevel histogram shifting mechanism. The transmission system preserves the same complexity. Moreover, the reconstructed image quality is exactly the same as the original compressed version due to the reversibility. Extensive experimental results demonstrate the effectiveness of the proposed scheme.