A Rotation Resistant Image Watermarking Algorithm via Circle

A rotation resistant image watermarking algorithm is proposed to solve digital image watermarking extracting difficultly when rotating with any angle. The algorithm firstly deal watermarking with binary serialization, and then divide the source image into several circle area with the center point of the image, segment the circle area according to length of the binary watermarking sequences with certain rules, the binary watermarking sequences embedded in segmentation of circle with modulus algorithm. When watermarking is extracted, do the corresponding inverse operation of embedded, firstly extracting the binary watermarking sequences from every segmentation of circle, then combined it into binary watermarking, recover the embedded watermarking image. Experimental results show that the algorithm has a good resistance to against rotation and compression attacks.