A study on intensity transformations to generate a high-quality decoding image in visual cryptography

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  • 画像割符における高品質復号画像生成のための輝度変換に関する考察
  • ガゾウ ワリフ ニ オケル コウヒンシツフクゴウ ガゾウ セイセイ ノ タメ ノ キド ヘンカン ニ カンスル コウサツ

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Visual cryptography is a technology that hides a secret image in other images and the hidden image can be decoded by the human visual system. A conventional method based on error diffusion method can product two high quality binary halftone images from two gray-scale images and we can decoded a gray-scale secret image by superposing these halftone images. In this paper, we consider about intensity transform to generate binary halftone image for high-quality decoding of a secret image in the conventional method. We added histogram equalization to conventional method and evaluated quality of images. As a result, we could decode the secret image more high-quality than conventional method.

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