Browsing by Author "Chang, Yuan-Shuo"

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A novel internal thread defect auto-inspection system
(2010-03-01)
Perng, Der-Baau
;
Chen, Ssu-Han
;
Chang, Yuan-Shuo
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
This paper describes a novel optical thread plug gauge (OTPG) for internal thread inspection using machine vision. The OTPG is composed of a rigid industrial endoscope, a charge-coupled device camera, and a two degree-of-freedom motion control unit. A sequence of partial wall images of an internal thread are retrieved and reconstructed into a 2D unwrapped image. Then, a digital image processing and classification procedure is used to normalize, segment, and determine the quality of the internal thread. The proposed OTPG provides an orientation-free and convenient method for detecting defects such as scratches, collapses, and flaws in an internal thread.