Abstract: Due to rapid growth in use of networked multimedia system has created need for copyright protection of digital media like image, video, audio. The watermarking techniques used to solve the problem of protecting digital media. Till date various schemes of digital watermarking have been proposed. This paper present comparative analysis of watermark embedded in the host image by discrete cosine transform (DCT) and by discrete wavelet transforms (DWT) using MATLAB. Experimental results confirm that the watermarking in DWT domain provides good image quality than the DCT domain.

Keywords: Digital watermarking, DCT, DWT, MATLAB.