Securing display of grayscale and multicolored images by use of visual cryptography

Hirotsugu Yamamoto; Yoshio Hayasaki; Nobuo Nishida

doi:10.1117/12.528495

22 June 2004 Securing display of grayscale and multicolored images by use of visual cryptography

Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 5306, Security, Steganography, and Watermarking of Multimedia Contents VI; (2004) https://doi.org/10.1117/12.528495
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

Security has become an important issue as information technology has become increasingly pervasive in our everyday lives. Security risks arise with a display that shows decrypted information. In this paper, we propose a secure information display technique using visual cryptography. Its decryption requires no special computing devices and is implemented using only human vision: the proposed display appears as a random pattern to anyone who looks at it unless the person views the displayed image through a decoding mask. We have constructed code sets to represent grayscale and multicolored images. Each pixel in a secret image is expanded to a group of subpixels. The displayed image consists of black and white subpixels to encrypt a grayscale image. To encrypt a multicolor image, black, red, green, and blue subpixels compose the displayed image. The decoding mask consists of transparent and opaque subpixels. Every pixel is encrypted using a pair that is chosen at random. We have demonstrated the proposed secure display with an LCD panel and a transparency on which a decoding mask was printed. The secret image was visible for a viewer within the viewing zone, although viewers outside the viewing zone perceived it as a random dot pattern.

Citation Download Citation

Hirotsugu Yamamoto, Yoshio Hayasaki, and Nobuo Nishida "Securing display of grayscale and multicolored images by use of visual cryptography", Proc. SPIE 5306, Security, Steganography, and Watermarking of Multimedia Contents VI, (22 June 2004); https://doi.org/10.1117/12.528495

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