Multiple Watermarking Scheme for Image Authentication and Copyright Protection using Wavelet based Texture Properties and Visual Cryptography

Abstract

Advancement in communication medium is producing large volume of digital information which needs to be protected. Watermarking is a technique that is used to hide secret signal into digital signal in a manner that does not reduce overall quality of the original signal. In relation to digital image watermarking, another area that is drawing attention is the multiple watermarking, where more than one watermark is embedded into single multimedia object. M ultiple watermarks are normally proposed as a method to provide extra security to an image by embedding two or more secret messages into the cover image. In the present research work, the concept of multiple watermarking is used to hide both copyright and authentication information into a color image. For this purpose a wavelet transformation based on texture properties and secret sharing us ing visual cryptography is used. Experimental results indicate that the proposed watermarking scheme is highly robust and does not degrade the original signal.

Data Hiding In Contourlet Coefficients Based On Their Energy

“…provide comparison between original and hybrid cover lena image The original and retrieve secret massage also shown and Fig. (10). show energy level of lena image coefficient cover.…”

“…The original signal is called as "cover signal" or "host signal". The process of inserting the secret signal is called embedding and the image after embedding is called "watermarked image" [10].…”

Robust ROI Watermarking Scheme Based on Visual Cryptography: Application on Mammograms

“…In this way, our medical images may remain intact and protected from illegitimate changes at the same time. Traditional methods and VC-based watermarking methods embed the watermark pattern in both the spatial domain [9,10,13] and the transform domains [11,12,14].…”