Improved reversible data hiding in encrypted images based on reserving room after encryption and pixel prediction

This paper proposes a new vacating room after encryption reversible data hiding scheme. Both joint and separate methods are presented. The most interesting features of the proposed scheme are the two staged embedding/decoding process and the group parity based data embedding for the separate method. Other new features are introduced as well. Compared with the state-of-the-art reserving room after encryption schemes, the proposed approach provides higher embedding bit-rates at lower distortion. Experimental results are provided.