Fuzzy adaptive image watermarking algorithm

Digital watermarking technology has been proposed as an effective method to protect the copyright of multimedia data. An adaptive watermarking algorithm of image based on fuzzy set theory that in discrete cosine transform (DCT) domain is proposed. By exploiting the visual masking and texture characteristics of human visual system (HVS) and considering the properties of the original image, a two-dimension fuzzy controller is designed, whose inputs are parameters of gray and texture of the original image. The strength of embedded watermarks is decided by the rules of fuzzy controller. It ensures the strength of the watermark adapting to the image itself entirely. The experimental results show that the watermarks generated with the proposed algorithm are invisible and robust against noise such as Gaussian and salt-pepper noise.