Optical EngineeringPosition-invariant two-dimensional image correlation using a one-dimensional space integrating optical processor: application to security verification
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We describe a 1-D space integrating optical processor that can perform position-invariant 2-D image correlation by 1-D scanning the input image 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 reference function is a position-invariant filter that is designed using distortion-invariant pattern recognition techniques to provide tolerance 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 recognition are described.