Analysis of Robust Watermarking Technique Using Mid Band DCT Domain for Different Image Formats

Aliquot watermarking is the unique idea in aliquot media for copyright protection. Various watermarking algorithm has been developed in recent years, but cognitive content of the intent, as they serve, they demarcated from each other. This context presents a new proposal for hiding a logo-based watermark in color still image. This dodge is based on averaging of central frequency coefficients of block Discrete Cosine Transform (DCT) coefficients of an image. It is unique from earlier dodge based on middle frequency coefficient by mean of high redundancy, to nurture malicious attacks. Here we propose algorithm of aliquot watermarking technique based on DCT (Discrete Cosine Transformation) using mid band for robustness. Through adjusting the block DCT coefficient of the image the watermarks are adumbered. We have been using the DCT mid band co-efficient for different image formats and the analysis appeared that the JPG image format‟s PSNR value on an average was lowest in contrast with others. The propound dodge also describes the expedient results that the method has unassailable robust.