Automatic interpretation of computed tomography (CT) images for hardwood log defect detection

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dc.contributor.authorLi, Peien
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:50:06Zen
dc.date.adate2008-11-18en
dc.date.available2014-03-14T21:50:06Zen
dc.date.issued1996-01-15en
dc.date.rdate2008-11-18en
dc.date.sdate2008-11-18en
dc.description.abstractThis thesis describes the design of an image interpretation system for the automatic detection of internal hardwood log defects. The goal of the research is that such a system should not only be able to identify and locate internal defects of hardwood logs using computed tomography (CT) imagery, but also should be able to accommodate more than one type of wood, and should show potential for real-time industrial implementation. This thesis describes a new image classification system that utilizes a feed forward artificial neural network as the image classifier. The classifier was trained with back-propagation, using training samples collected from two different types of hardwood logs, red oak and water oak. Pre-processing and post-processing are performed to increase the system classification performance, and to make the system be able to accommodate more than one wood type. It is shown in this thesis that such a neural-net based approach can yield a high classification accuracy, and it shows a high potential for parallelism. Several possible design alternatives and comparisons are also addressed in the thesis. The final image interpretation system has been successfully tested, exhibiting a classification accuracy of 95% with test images from four hardwood logs.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 88 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11182008-063222en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11182008-063222/en
dc.identifier.urihttp://hdl.handle.net/10919/45846en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.L5.pdfen
dc.relation.isformatofOCLC# 34619233en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecthardwood log defectsen
dc.subject.lccLD5655.V855 1996.L5en
dc.titleAutomatic interpretation of computed tomography (CT) images for hardwood log defect detectionen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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