Video reversible data hiding: An evolution to local distortion-tolerance framework

Recently, the rapid development of reversible data hiding (RDH) for video copyright protection has attracted more attentions of academic community. In this paper, a local distortion-tolerance video RDH method is proposed to achieve a compensatory embedding on multiple blocks for a higher embedding efficiency. Specifically, the effect of distortion drift is calibrated in a local region rather than in the single block, and the performance enhancement is obtained by the reduction of distortion drift over the region. The distortion-tolerance vector is used to rank the blocks in the local region and the blocks being independent of the adjacent regions will have higher chance to be embedded with secret bits. Then, the coefficients are modified in a pairwise manner. Since only one coefficient in a pair is used for embedding, the other one can be modified symmetrically for compensation. The experimental results validate the effectiveness of the proposed method to decrease the intra-frame distortion drift, increase the capacity and minimize the bit rate increase.