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We propose a new display system technology that can hide secret information behind a displayed image, while simultaneously satisfying both high invisibility and readability requirements. The hidden information is a kind of binary image including characters, and various kinds of patterns, i.e., quadratic residue (QR) codes. This technique uses a temporally bright modulated invisible pattern in a moving...
This paper develops a color image recovery system from a color-embedded gray image. A reversible color-to-gray algorithm is an effective technique from several viewpoints such as running cost, data quantity, and security in practical applications. Most of the conventional algorithms work only on electronic gray images in the closed computer world, and do not work on real-world materials through the...
Digital watermarks provide the capability to insert additional information onto various media, such as still images, movies and audio, by utilizing features of the content. Several methods for printed documents have already been proposed using features of the text or images. In order to overcome the disadvantages of existing methods, we have proposed a new information hiding scheme for printed documents;...
Digital watermarks provide the capability to add extra information to various media, such as still images, movies and audio, by utilizing features of its content. Several methods for printed document have already been proposed using features of the text or images. In this paper we treat the paper media itself as content and propose a new information hiding methodology which utilizes the fiber pattern...
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