Contrast enhancement in probabilistic visual cryptography schemes: a pixel count based approach
by T.E. Jisha; Thomas Monoth
International Journal of Information and Computer Security (IJICS), Vol. 25, No. 3/4, 2024

Abstract: The concerns with pixel expansion are eliminated by the introduction of size-invariant visual cryptography techniques. In the field of visual cryptography, the contrast of the decrypted image continues to be a hurdle. The two existing schemes in visual cryptography are the perfect reconstruction of black pixels and the perfect reconstruction of white pixels. In the current study, we introduce a size-invariant probabilistic technique, where the contrast of the deciphered image depends on the chosen scheme. Which scheme is employed depends on the total amount of black and white pixels in the covert image. Here, we have described the development and effectiveness of non-expanded probabilistic visual cryptography schemes with the perfect reconstruction of both black and white pixels that were based on several research studies. These schemes include (2, 2), (2, n), (n, n) and (k, n). We analysed the data using tables and charts to demonstrate the effectiveness of the suggested model, and we discovered that the projected models enhanced the contrast.

Online publication date: Tue, 14-Jan-2025

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