Blind digital watermarking algorithm based on DCT domain and fractal images

Abstract

Multimedia distribution across public network and internet is growing fast. With diverse evolution in technology of distribution and storage, various factors are challenging multimedia and internet technologies. Digital watermarking solves the problems of several threats and protects the digital data from being compromised or altered. It also provides copyright protection to avoid illegal modification of digital data. In this paper we have proposed a blind digital watermarking algorithm based on fractal images on Discrete Cosine Transform (DCT) domain. The fractal code is converted to its respected binary images and used as a watermark image. The cover image is decomposed to its respective grayscale equivalents of RGB components. The fractal codes as watermark binary images are embedded into grayscale equivalent of RGB components of cover image. The embedding is done in mid frequency to secure the codes from several attacks. The robustness and imperceptibility of the algorithm is shown in results and analysis.