A Wavelet-Based Image Watermarking Scheme for Stereoscopic Video Frames

In this paper, we propose a digital watermarking method for stereoscopic video frames. A stereoscopic video frame is stored as two images and combined by software while displayed. These two stored images are with high similarity. On the other hand, a pirate can only clip half of a frame to remove watermarks. In the circumstances, it should be taken into consideration to resist collusion attacks and clip attacks while developing a watermarking scheme for stereoscopic videos. Thus, the proposed watermarking method embed two watermarks into the two images of a stereoscopic video frame, respectively. To resist collusion attacks, the proposed scheme identify similar portions of the two images containing in a stereoscopic video frame. Then, identical modification will be applied on the same positions of the similar portions. As shown in experimental results, test images with watermarks embedded are still have high quality. Although two watermarks may overlap with each other after the proposed scheme, they still have high embedding effectiveness. Moreover, watermark embedding method adopted in the proposed watermarking scheme has been well-studied. It has been indicated that the embedded watermarks are still detectable after common image processing operations. Thus, the proposed scheme is suitable for copyright protection of stereoscopic videos.