Share Email Print
cover

Proceedings Paper

Computer-generated hologram of asymmetry fractional Fourier transform
Author(s): Zhaoxuan Sheng; Hongxia Wang; Junfa He; Youjie Zhou; Jun Wang; Cairong Mao
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A new optical encryption technique based on computer-generated hologram (CGH) and fractional Fourier transform (FRT) is presented. And the algorithm of making asymmetry FRT CGH is provided in this paper. In this method, the fractional Fourier transform of the input image is performed by two one-dimensional FRT with different orders in the x and y directions in cascade. With Lohmann III detour phase encoding method and computer plotting program, the transformed image is encoded and fabricated into CGH on the computer. Then a piece of asymmetry fractional Fourier transform CGH (AFRTCGH) of original input image is obtained. In order to reconstruct the encoded image, a special fractional Fourier transform systems with two special cylinder lens’ are needed. Namely, only when the transform order in each direction is respectively matched with that of the asymmetry fractional Fourier transform CGH, can the encoded image be reconstructed exactly. Because of its particularity of image reconstruction, it is regarded as a new optical security system and can be used in anti-counterfeiting. When it is used to encrypt image or to anti-Counterfeit, anti-counterfeiting intensity can be improved greatly. So it has very high applying value.

Paper Details

Date Published: 7 February 2005
PDF: 5 pages
Proc. SPIE 5636, Holography, Diffractive Optics, and Applications II, (7 February 2005); doi: 10.1117/12.574531
Show Author Affiliations
Zhaoxuan Sheng, Xi'an Hongqing Institute of High Technology (China)
Hongxia Wang, Xi'an Hongqing Institute of High Technology (China)
Junfa He, Xi'an Hongqing Institute of High Technology (China)
Youjie Zhou, Xi'an Hongqing Institute of High Technology (China)
Jun Wang, Xi'an Hongqing Institute of High Technology (China)
Cairong Mao, Xi'an Hongqing Institute of High Technology (China)


Published in SPIE Proceedings Vol. 5636:
Holography, Diffractive Optics, and Applications II
Yunlong Sheng; Dahsiung Hsu; Chongxiu Yu; Byoungho Lee, Editor(s)

© SPIE. Terms of Use
Back to Top