We technically investigate the robustness of an image encryption technique that uses a virtual phase image and a joint transform correlator (JTC) in the frequency domain. An encrypted image is obtained by the Fourier transform of the product of a virtual phase image, which camouflages the original image, and a random phase image. The resulting image is then decrypted by use of a decrypting key made from the proposed phase assignment rule in order to enhance the level of security. We demonstrate that the encrypted image generated by the proposed JTC-based decryption technique is robust to data loss and image shift.
© 2004 Optical Society of America
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(070.4560) Fourier optics and signal processing : Data processing by optical means
(100.1160) Image processing : Analog optical image processing
(100.3010) Image processing : Image reconstruction techniques
Dong-Hoan Seo, Chang-Mok Shin, and Soo-Joong Kim, "Shift-Tolerance Property of Fully Phase Encryption that Uses a Joint Transform Correlator," Appl. Opt. 43, 4011-4016 (2004)