Spatial Filters for Optical Correlation
Abstract
A set of images comprising an aximuthal training set of M-48, tank images was used as the basis of simulation studies to assess the performance of improved metric sort ternary phase-amplitude filters using gray scale inputs. Results compared favorably with those obtained with other filter formulations. Binary versions of these images were used as the basis for a study of image binarization effects on optical correlation performance. The study indicated excellent correlation performance with binarized inputs and references. A set of T-72 tank images, including an azimuthal training set and input scenes with clutter, was the basis for a simulation study comparing correlation performance of smart TPAFs with gray scale and binary input scenes. The correlation results with binary images were at least equal in quality to those using gray scale inputs. 128xl28 correlation filters were generated on a zero-filled 256x256- pixel array. These filters were correlated with l28xl28-pixel input scenes (imbedded in a zero-filled 256x256 array for digital simulations). Methods for implementing these filters in a correlator with 128xl28-pixel SLM's at both input and filter planes were investigated by both simulation and experimentation. The two methods provided acceptable results.... Laser radar, Near-infrared, Optical pattern recognition, Phase-only filters.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1993
- Accession Number
- ADA267199
Entities
People
- David L. Flannery
Organizations
- University of Dayton