Accession Number : ADA321132

Title :   Region-Of-Interest Correlation Filters.

Descriptive Note : Final rept.,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Flannery, David L.

PDF Url : ADA321132

Report Date : DEC 1996

Pagination or Media Count : 35

Abstract : This effort investigated Region-of-Interest (ROI) filter formulations for Binary Phase-Only Filter (BPOF) implementation in coherent optical correlator systems. A Region-of-Interest may be broadly defined as a localized region in a sensor pattern (an image) that has a high probability of containing a pattern (a target image) of interest for an application such as automatic target recognition (ATR). Such filters are useful in the early stages of an ATR process because they can limit the total area of an input image that is processed, thus reducing the required processor throughput (and size, weight, and power consumption). Few if any formal procedures for designing ROI correlation filters have existed prior to this effort, while formulations for more specific filters matched to a narrow range of targets and target aspects are relatively numerous. The work reported here developed and applied concepts of normalized BPOF distance, cluster analysis, and the least aggregate square error (LASE) correlation filter formulation to yield a successful ROI filter formulation procedure, called the cluster-based ROI BPOF. The formulation was implemented in software suitable for use on desktop computers, and the validity of the resulting ROT filters was demonstrated on a realistic test problem.

Descriptors :   *OPTICAL CORRELATORS, *OPTICAL FILTERS, ALGORITHMS, SOFTWARE ENGINEERING, IMAGE PROCESSING, TARGET RECOGNITION, OPTICAL IMAGES, COHERENT OPTICAL RADIATION, LEAST SQUARES METHOD, OPTICAL DETECTORS, OPTICAL PROCESSING.

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE