Show simple item record

dc.contributor.authorHavlicek, Joseph P.en_US
dc.date.accessioned2017-11-09T20:41:48Z
dc.date.available2017-11-09T20:41:48Z
dc.date.issued1988en_US
dc.identifier.urihttp://hdl.handle.net/10919/80083
dc.description.abstractDetection of point targets and blurred point targets in midwave infrared imagery is difficult because few assumptions can be made concerning the characteristics of the background. In this thesis, real time spatial prefiltering algorithms that facilitate the detection of such targets in an airborne threat warning system are investigated. The objective of prefiltering is to pass target signals unattenuated while rejecting background and noise. The use of unsharp masking with median filter masking operators is recommended. Experiments involving simulated imagery are described, and the performance of median filter unsharp masking is found to be superior to that of the Laplacian filter, the linear point detection filter, and unsharp masking with a mean filter mask. A primary difficulty in implementing real time median filters is the design of a mechanism for extracting local order statistics from the input. By performing a space-time transformation on a standard selection network, a practical sorting architecture for this purpose is developed. A complete hardware median filter unsharp masking design with a throughput of 25.6 million bits per second is presented and recommended for use in the airborne threat warning system.en
dc.format.extentx, 140 leavesen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherVirginia Polytechnic Institute and State Universityen_US
dc.relation.isformatofOCLC# 18706177
dc.rightsThe authors of the theses and dissertations are the copyright owners. Virginia Techs Digital Library and Archives has their permission to store and provide access to these works.en_US
dc.subject.lccLD5655.V855 1988.H384en_US
dc.subject.lcshImage processing -- Digital techniquesen_US
dc.subject.lcshDetectorsen_US
dc.subject.lcshTarget acquisitionen_US
dc.titleMedian filtering for target detection in an airborne threat warning systemen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical Engineeringen_US
dc.type.dcmitypeTexten_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record