Browsing by Author "Cho, Chia-Hung"

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Projection moire profilometry with high-dynamic range image
(2012-02-01)
Chou, Sen-Yih
;
Cho, Chia-Hung
;
Du, Ming-Jhe
;
Chi, Sien
;
光電工程學系
As a type of optical measuring apparatus, the charge-coupled diode (CCD) camera provides the capability of increasing the speed of measurement by inspecting an area with only one shot. However, the CCD camera's high-variation range of reflectivity presents an exceptional challenge for the optical measurement established on the surface. We present a method that could enable one to acquire an image with a high-dynamic range in one shot without any reduction in spatial resolution. Because of the sufficient signal-to-noise ratio, the method presented could perform the robustness of the phase-retrieving algorithm, and the surface topography could be measured more accurately. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.2.021112]