ABSTRACT
This chapter discusses copyright protection tool for digital images through an image watermarking methodology. Watermark embedding or insertion is performed with a grayscale cover image and a binary watermark. The watermark insertion is performed in the spatial domain, so that the execution time and computational cost will be less and the hardware implementation becomes easier. The spectral residual-based approach is used in generating the saliency map. The purpose of watermark extracting is to recover the watermark from a watermarked image so that the originality can be evaluated by comparing it to the original mark. The spatial domain watermarking schemes mostly follow the least significant bit replacement technique to insert data into the cover image. The analogous matrices for the concerned images illustrate the purposes and outcomes of the steps followed in this watermark insertion procedure. The hiding capacity map of the watermarked image is used to obtain the number of watermark bits embedded into a particular cover image pixel.
