Reversible Data Hiding in Encrypted AMBTC Compressed Images

摘要

Signal processing in encrypted domain has attracted high attention during the needs of content security and privacy protection. Reversible data hiding in encrypted images (RDH-EI) also becomes a hot topic. However, most of the published techniques are designed for uncompressed images rather than JPEG-, VQ- and BTC-compressed images. In this paper, for the first time, a RDH-EI method for AMBTC images is proposed. In this method, the higher mean and lower mean of a triple in AMBTC compressed image is encrypted by using stream cipher with the same random bits. Therefore, the spatial correlation of a nature image is preserved and redundant space can be exploited by using the histogram of prediction error. Experimental results demonstrate that the proposed method can embed considerable bits while leave little distortion.