Image Watermark Algorithm for Copyright Protection Based on Human Visual System

The growth of new image technologies has created a need for techniques that can be used for copyright protection of digital images, video and audio. One approach for copyright protection is to introduce an invisible signal, known as a digital watermark, into an image or video sequence. Wavelet-based watermark exploit the frequency and spatial of the transformed data in multiple resolutions to gain robustness. Although the human visual model offers imperceptibility in wavelet watermark, it suffers high computational cost. In this paper we present a new algorithm to reduce the computational time while preserving the performance of imperceptibility and robustness. Moreover, the watermark is encrypted by magic square algorithm in order to improve security.