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Optical Encryption System using a Computer Generated Hologram

  • Kim, Jong-Yun (Dept. of Electronic Engineering Kyungpook National University) ;
  • Park, Se-Joon (Dept. of Electronic Engineering Kyungpook National University) ;
  • Kim, Soo-Joong (Dept. of Electronic Engineering Kyungpook National University) ;
  • Doh, Yang-Hoi (Dept. of Electronic & Information, Kumi college) ;
  • Kim, Cheol-Su (Dept. of Electronic Engineering, Cheju National University)
  • Received : 1999.08.25
  • Published : 2000.03.01

Abstract

A new image encoding and identification scheme is proposed for security verification by us-ing a CGH(computer generated hologram), random phase mask, and a correlation technique. The encrypted image, which is attached to the security product, is made by multiplying a QP- CGH(quadratic phase CGI) with a random phase function. The random phase function plays a key role when the encrypted image is decrypted. The encrypted image can be optically recovered by a 2-f imaging system and automatically verified for personal identification by a 4-f correlation system. Simulation results show the proposed method can be used for both the reconstruction of an original image and the recognition of an encrypted image.

Keywords

References

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Cited by

  1. Digital watermarking using binary phase hologram and optical interferometer vol.14, pp.4, 2003, https://doi.org/10.3807/KJOP.2003.14.4.377