STEGANOGRAPHIC APPROACH FOR HIDING IMAGE IN DCT DOMAIN

Abstract

Since all the multimedia products are released via internet so it’s an urgent need today to protect the data from malicious attacks. This lead to the research in the area of Digital watermarking which intends to protect the copyright information of the intellectuals. In this paper a DCT based watermarking scheme is proposed which provides higher resistance to image processing attacks such as JPEG compression, noise, rotation, translation etc.In this approach, the watermark is embedded in the mid frequency band of the DCT blocks carrying low frequency components and the high frequency sub band components remain unused. Watermark is inserted by adjusting the DCT coefficients of the image and by using the private key. Watermark can then be extracted using the same private key without resorting to the original image. Performance analysis shows that the watermark is robust.