Enhanced Watermarking Technique for Color Images using Visual Cryptography
Enas F. Al rawashdeh, Rawan Zaghloul · 2010
In this paper we consider a watermarking technique based on visual cryptography that offers enhancing the security issues in previous works. The proposed method is applied over color images, where the RGB image is converted to the HSV color scheme. The embedding process depends on the saturation plane (S) on which we apply logical X-OR, most significant, and parity operations; to generate the actual plane in which we want to embed our watermark -upon the rules of visual cryptography (as invented by Noar and Shamir, 1995). Finally the generated master share is registered in the third party. In the extraction process, applying the same method over the watermarked image will generate the master share again; combine it with that of the third party to generate the embedded watermark. Different attack scenarios are taken into consideration such as filtering, additive noise, compression, rotation, flipping, cropping, and distortion.