31 March 2000 Optical security system based on computer-generated hologram
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A new image encoding and identification scheme is proposed for security verification by using a CGH (computer generated hologram), a random phase mask, and a correlation technique. The encrypted image, which is attached to the security product, is made by multiplying PCGH (phase CGH) 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 a 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.
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Jong-Yun Kim, Jong-Yun Kim, Sang-Gug Park, Sang-Gug Park, Cheol Su Kim, Cheol Su Kim, Jeong-Woo Kim, Jeong-Woo Kim, Sung-Young Kim, Sung-Young Kim, Soo-Joong Kim, Soo-Joong Kim, "Optical security system based on computer-generated hologram", Proc. SPIE 4043, Optical Pattern Recognition XI, (31 March 2000); doi: 10.1117/12.381606; https://doi.org/10.1117/12.381606

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