Stereo Image Watermarking Method for Authentication with Self-Recovery Capability

To address issues of content authenticity verification and integrity protection, a stereo image watermarking method based disparity is proposed. Firstly, the stereo image blocks are classified into eight types according to the smoothness of it, and the alterable-length recovery bits are generated. The recovery bits include foremost bits, detail bits, type bits and disparity bits. Foremost bits are embedded twice for improving quality of recovery. Moreover, disparity is embedded as well for recovery further. At the receiver side, recovery bits extracted from watermarked stereo image not only localize tampered regions, but also recover them. The visual quality of the watermarked stereo image is imperceptible due to the low embedding volume. Experimental results show that the proposed method can detect tamper precisely and provide high restoration quality.