Defect detection system for lumber

dc.contributor.assigneeVirginia Polytechnic & State Universityen
dc.contributor.assigneeThe United States of America as represented by the Secretary of the Airen
dc.contributor.inventorConners, Richard W.en
dc.contributor.inventorKline, David E.en
dc.contributor.inventorAraman, Phillip A.en
dc.contributor.inventorXiao, Xiang-Yuen
dc.contributor.inventorDrayer, Thomas Hudsonen
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:54:06Zen
dc.date.available2016-08-24T17:54:06Zen
dc.date.filed1996-08-16en
dc.date.issued1999-09-28en
dc.description.abstractA machine vision system that can address a number of board, lineal, cant, and flitch inspection problems by incorporating all the sensors needed to address the surface feature detection problem, the three-dimensional shape detection problem, and the internal feature detection problem. To detect surface features, two color cameras are employed, one for imaging each of the major faces of a board, lineal, cant, or fitch. To address the three-dimensional shape detection problem, a high speed laser profiling device is employed. An x-ray scanning system is employed to detect internal features. The system is able to process material in a species-independent manner by using a histogram-based segmentation procedure for analyzing both the camera imagery and the x-ray imagery; and can detect small defects by removing the effects of large features from the histograms once they have been detected. The system also utilizes redundant information from the set of multiple sensors to improve system accuracy. The volume of data that must be analyzed due the use of three sets of sensors is reduced by ordering the way the data is analyzed. The laser profile data is processed first, followed by the x-ray data and the color imagery. Finally, the system reduces the required volume of data by incorporating a crack/check preserving filter. This filter is implemented in special purpose hardware, and filters the color imagery as it is collected.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber8707982en
dc.identifier.patentnumber5960104en
dc.identifier.urihttp://hdl.handle.net/10919/72399en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/04/601/059/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcG01N21/8986en
dc.subject.cpcG01N33/46en
dc.subject.cpcG06K9/38en
dc.subject.cpcG06T7/001en
dc.subject.cpcG06T2207/30161en
dc.subject.uspc144/402en
dc.subject.uspcother382/141en
dc.subject.uspcother382/171en
dc.titleDefect detection system for lumberen
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen
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