Relationship Modulation Based Blind Stereoscopic Image Watermarking Algorithm for 3D Media

With the development of three dimensional media resources, the corresponding intellectual property protection problem also occurs. In this paper, a blind stereoscopic image watermarking algorithm based on the relationship modulation is proposed. Firstly, the original stereoscopic images are divided into non-overlapping blocks respectively, and the polarity of these blocks in left and right images are defined. Secondly, the watermark is embedded by modulating the relationship between watermark and the polarity of the divided blocks. When the binary watermark is "1", the polarity of the corresponding image block is changed in order to make that the polarity of left image block is the same as the right one. On the contrary, the polarity of left image block is set to be not the same as the right one. The binary watermark is extracted by judging polarity which is consistent or not from the watermarked images without the original images. The experimental results show that the proposed algorithm is robust against some general image processing operations.