Abstract
Visual cryptography is a kind of cryptography that can be decoded directly by the human visual system when transparencies are stacked. Extended visual cryptography allows to print meaningful images on transparencies which can conceal the existence of “secret” in the transparencies. A lot of studies have tried to incorporate continous-tone images into extended visual cryptography. However, most of them suffer from deterioration of the resulting images. This paper proposes a new scheme for extended visual cryptography for continuous-tone images. It mainly consists of two techniques, namely parallel error diffusion and optimum tone mapping and can quickly encrypted images with no pixel expansion and high contrast. Some experimental results are shown to examine its effectiveness as well as limitation.
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References
Ateniese, G., Blundo, C., Santis, A.D., Stinson, D.R.: Visual cryptography for general access structure. Information and Computation 129, 86–106 (1996)
Ateniese, G., Blundo, C., Santis, A.D., Stinson, D.: Extended capabilities for visual cryptography. Theoretical Computer Science 250, 143–161 (2001)
Floyd, R., Steinberg, L.: An adaptive algorithm for spatial grayscale. Society for Information Display 17, 75–77 (1976)
Fu, M., Au, O.: A novel method to embed watermark in different halftone images: data hiding by conjugate error diffusion (dhced). In: Intl Conference on Acoustics, Speech, and Signal Processing, vol. III, pp. 529–532 (2003)
Jarvis, J., Judice, C., Ninke, W.: A survey of techniques for the display of continuous tone pictures on bilevel displays. Computer Graphics and Image Processing 5(1), 13–40 (1976)
Kang, H.: Digital Color Halftoning. SPIE Optical Engineering Press, IEEE Press (1999)
Myodo, E., Takagi, K., Miyaji, S., Takishima, Y.: Halftone visual cryptography embedding a natural grayscale image based on error diffusion technique. In: Intl Conference on Multimedia and Expo., pp. 2114–2117 (2007)
Myodo, E., Takagi, K., Yoneyama, A.: Deterministic tone mapping to gamut area of halftone visual cryptography. IEICE Trans. on Fundamentals J93-A(12), 805–820 (2010)
Nakajima, M., Yamaguchi, Y.: Extended visual cryptography for natural images. Journal of WSCG 10(2), 303–310 (2002)
Naor, M., Shamir, A.: Visual Cryptography. In: De Santis, A. (ed.) EUROCRYPT 1994. LNCS, vol. 950, pp. 1–12. Springer, Heidelberg (1995)
Ulichney, R.: Digital Halftoning. The MIT Press (1987)
Wang, Z., Arce, G.R., Crescenzo, G.D.: Halftone visual cryptography via error diffusion. IEEE Trans. on Information Forensics and Security 4(3), 383–396 (2009)
Wu, C., Thompson, G., Stanich, M.: Digital watermarking and steganography via overlays of halftone images. Electrical Engineering IBM Research Report RC23267 (W0407-013), IBM (2004)
Yang, C.N., Chen, T.S.: Extended visual secret sharing schemes: improving the shadow image quality. International Journal of Pattern Recognition and Artificial Intelligence 21, 879–898 (2007)
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Yamaguchi, Y. (2012). An Extended Visual Cryptography Scheme for Continuous-Tone Images. In: Shi, Y.Q., Kim, HJ., Perez-Gonzalez, F. (eds) Digital Forensics and Watermarking. IWDW 2011. Lecture Notes in Computer Science, vol 7128. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32205-1_19
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DOI: https://doi.org/10.1007/978-3-642-32205-1_19
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