RST Invariant Image Watermarking Based on Invariant Contents

An image watermarking scheme resisting RST (rotation, scaling, translation) based on RST invariant square region is proposed in the paper. Two SIFT (scale-invariant feature transform) feature points are selected to determine the position, size, direction of the region. The watermark embedding and detection is completed in the square region with quantization, which could guarantee blind detection. A binary image is employed to be the watermark due to the improvement of watermark capacity. Experimental results show that the proposed scheme can effectively resistant geometrical attacks as well as common signal processing.