An image watermarking scheme based on FWHT-DCT

Digital image watermarking is frequently used for many purposes, such as image authentication, fingerprinting, copyright protection, and tamper proofing. Imperceptibility and robustness are the watermark requirements of good watermarks. In this paper, we propose the Fast Walsh Hadamard transform (FWHT) combined with the Discrete Cosine Transform (DCT) as a new image watermarking scheme. The FWHT reorders the high-to-low sequence components contained in the signal. This scheme produces high perceptual transparency of the embedded watermark. Experimental results show that the proposed scheme has good visual perception and is robust against attacks.