of Pharmaceutical , Biological and Chemical Sciences Review on Image Watermarking

With the rapid development of information technology, multimedia data are transmitted through digital media. Always the transmission media is not secure. Hence there is a need to protect the information during transmission. To transmit the image information in a secured way, digital image watermarking is one of the best data hiding technique. In image watermarking technique there is a chance to destroy the information intentionally or uinintentionally by the attacker. This will affect the robustness of the entire image watermarking system. In this paper recent image watermarking works are reviewed for different attacks based on image quality, size, reterived data, etc . In this paper, the different category of image watermarking attacks are analyzed based on attacker knowledge. This paper categorizes the image watermarking attacks into blind and non-blind image watermarking attacks. Then image watermarking techniques are analysed for various attacks using different quality measures. Also, this paper specifies the four different benchmark tools such as Stirmark, Optimark, Checkmark and Certimark to evaluate the image watermarking system. The image watermarking attacks are measured with the help of various performance measures.