K. J. Somaiya

Internet and social media have become an inseparable part of the human life which has led to extensive sharing of all kinds of digital information including but not limited to photos and videos. The risk of plagiarism and counterfeiting follows with the technology of information sharing. Digital watermarking deals in encrypting useful information within various forms of media for copyright protection and authentication. In this paper, an algorithm is used to embed a colored watermark image within colored cover image in a robust fashion. In the proposed technique, principal component analysis (PCA) is applied to get compressed watermark image. By using Bhattacharyya distance and kurtosis, the embedding and scaling factors are computed to create an adaptive digital watermarking mechanism. The embedding and extraction algorithms are developed by considering image segmentation in RGB space. Performance of the proposed method was tested using PSNR and NCC parameters on multiple cover and watermark images and also by considering common image processing attacks like salt and pepper, cropping, rotation.