Image Watermarking Techniques in Spatial Domain: A Review

The rapid growth of digital multimedia technologies brings tremendous attention to the field of digital watermarking. The owner or the distributor of the digital images can insert unique watermark into copies for different customers or receivers, which will be helpful to identify the source of illegal copies. Watermarking embeds a secret message into a cover multimedia data. In media watermarking the secret is usually a copyright notice and the cover a digital image. In digital watermarking, robustness is still a challenging problem if different sets of attacks needed to be tolerated simultaneously. Many algorithms have been developed for check the robustness of images In this paper we are reviewing spatial watermarking technique for digital images like LSB technique, BLOCK based and Secure watermarking techniques.