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Extended Visual Cryptography for Color Images and its PSNR Analysis
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 67 - Number 17 |
| Year of Publication: 2013 |
| Authors: L M Varalakshmi, Prithy R, Radhika Parameswari |
10.5120/11487-7189
|
L M Varalakshmi, Prithy R, Radhika Parameswari . Extended Visual Cryptography for Color Images and its PSNR Analysis. International Journal of Computer Applications. 67, 17 ( April 2013), 17-22. DOI=10.5120/11487-7189
Abstract
Visual cryptography (VC) is a cryptographic technique which allows visual information (pictures, text, etc. ) to be encrypted in such a way that decryption becomes a mechanical operation that does not require a computer. Color visual cryptography encrypts a color secret message into n color halftone image shares. Some methods for color visual cryptography are not satisfactory in terms of producing either meaningless shares or meaningful shares with low visual quality, leading to suspicion of encryption. In order to reduce the size and the distortion of decrypted image we propose the visual cryptography for color image using visual information pixel (VIP) synchronization and floyd error diffusion dithering technique. This technique improves the quality of decrypted image compared to other dithering techniques. Comparisons with previous approaches show the superior performance of the new method.
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