Watermark embedding and extracting scheme for standard test image in spatial domain

Digital watermarking has gained a lot of importance for digital media recently. It deals with hiding secret bits of information with a digital content as a cover. This is very useful for many applications like copyright control, authenticity of documents, captioning, broadcast monitoring etc. Various techniques for watermarking have been proposed in the recent past. In the first part of this paper we introduce an overview to digital watermarking: The general framework, its embedding process and extraction process of watermarking scheme. In the second part we introduce an overview of watermarking in spatial domain. We define LSB invisible watermarking scheme for embedding and extraction of watermark in standard test image. We add the noise in watermarked image and calculate the value of MSE and PSNR at different levels. At the receiver end we extract the watermark from the watermarked image. Finally we introduce human visual system.