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We propose a visual cryptography method based on error diffusion for generating share images of the same size as a given secret image. Two share images printed on separate transparencies are stacked t...o decrypt a secret image, where opaque and transparent pixels correspond to black (0) and white (1), respectively. An opaque pixel on the stacked image can be given by three combinations of pixel values in two share images: `00', `01' and `10'. This arbitrariness in opaque pixels in a secret image is effectively used in the proposed method. Experimental results show that the proposed method conceals a secret image in share images acceptably, and the quality of the reconstructed secret image given by stacking transparencies onto which the share images by the proposed method are printed is better than that of the conventional methods in terms of visual comparison and quantitative evaluation with the peak signal-to-noise ratio (PSNR).続きを見る
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