B. Javidi et J. Wang, POSITION-INVARIANT 2-DIMENSIONAL IMAGE CORRELATION USING A ONE-DIMENSIONAL SPACE INTEGRATING OPTICAL PROCESSOR - APPLICATION TO SECURITY VERIFICATION, Optical engineering, 35(9), 1996, pp. 2479-2486
We describe a 1-D space integrating optical processor that can perform
position-invariant 2-D image correlation by 1-D scanning the input im
age over a 2-D reference image along a coordinate axis, which we shall
refer to as the x axis in a Cartesian coordination system. The 2-D re
ference function is a position-invariant filter that is designed using
distortion-invariant pattern recognition techniques to provide tolera
nce to misalignments along the y axis between the input image and the
reference function during the 1-D spatial correlation. Applications of
this system to phase-encoded image recognition and fingerprint recogn
ition are described. (C) 1996 Society of Photo-Optical Instrumentation
Engineers.