A new technique for the optical encoding of images is presented. The method of generalized projections is used to design diffractive optical elements for the phase encryption of biometrics for security applications. The encryption algorithm converges rapidly, and the decryption is seen to be secure and tolerant to additive noise.
© 1996 Optical Society of America
E. G. Johnson and J. D. Brasher, "Phase encryption of biometrics in diffractive optical elements," Opt. Lett. 21, 1271-1273 (1996)