Ladar image recognition using synthetically derived discrete phase-amplitude filters in an optical correlator

David Calloway; Dennis H. Goldstein

doi:10.1117/12.458403

6 March 2002 Ladar image recognition using synthetically derived discrete phase-amplitude filters in an optical correlator

David Calloway, Dennis H. Goldstein

Author Affiliations +

Proceedings Volume 4734, Optical Pattern Recognition XIII; (2002) https://doi.org/10.1117/12.458403
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Correlation filters using computer-generated laser radar imagery have been constructed. This paper describes how the filters were constructed and reports correlating result with the synthetic imagery used in the training set, with real ladar imagery of equivalent targets, and with real ladar imagery of false targets. A comprehensive set of images was collected on the Eglin Test Range using a direct-detect scanning ladar mounted on a 100-meter tower. Various targets were placed on a large turntable and ladar range and intensity data were collected at various aspect and depression angles. The Irma scene generation software package was then used to generate synthetic ladar imagery for these targets at a similar set of range, aspect, and depression angles. Several different techniques were used to generate the filters and to process the imagery used in this research. This paper describes one of the most successful techniques. The paper provides details on the iterative approach used to generate composite filters, describes how they were applied, and compares the results produced from synthetic and real target imagery. This experiment was considered a success since the synthetically derived filters were capable of recognizing images of real targets while rejecting false targets.

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David Calloway and Dennis H. Goldstein "Ladar image recognition using synthetically derived discrete phase-amplitude filters in an optical correlator", Proc. SPIE 4734, Optical Pattern Recognition XIII, (6 March 2002); https://doi.org/10.1117/12.458403

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KEYWORDS

Image filtering

LIDAR

Signal to noise ratio

Filtering (signal processing)

Composites

Optical filters

Target recognition

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