Sangeeta D. Jadhav, Army Institute of Technology, India

An attempt is made to implement a digital color image-adaptive watermarking scheme in spatial domain and hybrid domain i.e host image in wavelet domain and watermark in spatial domain. Blind Source Separation (BSS) is used to extract the watermark The novelty of the presented scheme lies in determining the mixing matrix for BSS model using BFGS (Broyden–Fletcher–Goldfarb–Shanno) optimization technique. This method is based on the smooth and textured portions of the image. Texture analysis is carried based on energy content of the image (using GLCM) which makes the method image adaptive to embed color watermark. The performance evaluation is carried for hybrid domain of various color spaces like YIQ, HSI and YCbCr and the feasibility of optimization algorithm for finding mixing matrix is also checked for these color spaces. Three ICA (Independent Component Analysis)/BSS algorithms are used in extraction procedure ,through which the watermark can be retrieved efficiently . An effort is taken to find out the best suited color space to embed the watermark which satisfies the condition of imperceptibility and robustness against various attacks.

ICA,GLCM,BSS,BFGS