Halftone Visual Cryptography with Pixel Expansion through Error Diffusion
نویسندگان
چکیده
Extended Visual Cryptography (EVC) concept provides meaningful shares instead of non meaningful shares. In this paper we proposed an algorithm based on EVC which enhances the contrast of the recovered secret image. Here the size of image visible on shares is taken to be three times as that of secret image, both the images are assumed in grey level. In the proposed algorithm secret image and the visible image are first converted to halftone image using Halftone error diffusion method. Recovered image from the shares generated by is found to be of better quality. Standard parameters like Negative Rate Matrix, Recall, Precision, F-Measure, Balanced classification rate (BCR), Balanced error rate (BER) of visual cryptography are used to compare the quality of recovered image by our proposed scheme with other state of art EVC approaches.
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