Chau-Jern CHENG^*, Li-Chien LIN¹, Chien-Ming WANG¹ and Chiung-Liang CHEN¹

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R.O.C.
¹Department of Communications Engineering, Feng Chia University, Taichung, Taiwan, R.O.C.

(Received February 23, 2005; Accepted August 13, 2005)

This study describes optical encryption based on joint transform correlator architectures using a binary phase difference key mask, designed by discrete sinc function interpolation. The key mask has the required properties of space-limited and phase-mostly spectrum for accurate image recovery. Gray-level image encryption and decryption performance measures are discussed as well.

Key words: optical encryption, joint transform correlator, sinc interpolation

^*E-mail address: cjcheng@ntut.edu.tw