DCT Based Robust Image Watermarking Scheme using Adaptive Quantization Index Modulation and Genetic Algorithm

摘要

A novel, oblivious and robust image watermarking scheme based on Discrete Cosine Transform (DCT) of the host image and Adaptive Quantization Index Modulation (AQIM) is presented. DC coefficient of each DCT transformed block is selected for embedding the watermark. A new method called AQIM is proposed for embedding the binary watermark. Genetic Algorithm (GA) is used for optimizing the parameters of AQIM. Performance of the scheme is compared with the existing scheme. This algorithm is highly robust for different attacks on the watermarked image and superior in terms of Peak Signal to Noise Ratio (PSNR) and Normalized Cross correlation (NC).