Optical Spatial Filter Development.
Final technical rept. Sep 90-Dec 94,
NORTH TEXAS STATE UNIV DENTON DEPT OF MATHEMATICS
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The objective of this program was the design of optical spatial filters. Among the topics discussed in this report are the proper role of correlation in target recognition and discrimination noise considerations for the objective function used in designing spatial filters correct computer modeling of the correlation process a completely new approach to the design of general spatial filters as a constrained optimization question in all free parameters all amplitudes and phases the design of spatial filters whose entries are either zero or a continuous phase as an optimization question the optimal discretization of spatial filters whose entries are either zero or a continuous phase the need and sufficiency for spatial filters whose entries are either zero or an nth root of unity the problems of targetbackground contrast and target translation invariance with respect to background intensity phase- encoding of imagery and its advantages zero-mean intensity phase-encoding of imagery and its advantages in solving the background problems and a new edge enhancement binarization procedure based on phase-encoding and local Wigner transforms. A secondary purpose of this document is to be a user guide to the software created during this effort for the design of spatial filters. A goal of this effort nas been a drastic refinement, extension, and extrapolation of spatial filter design codes in the parallel programming language occam 2 for use in inexpensive transputer based parallel processing systems. Spatial filter design on an occam 2transputer based system is now approximately 250 times faster than on a FORTRANVax system.
- Optical Detection and Detectors