Please use this identifier to cite or link to this item: https://doi.org/10.1117/1.1487853
Title: Shadow moiré topography using a flatbed scanner
Authors: Ng, T.W. 
Tajuddin, A.
Keywords: Fringe analysis
Moiré
Scanners
Issue Date: Aug-2002
Source: Ng, T.W., Tajuddin, A. (2002-08). Shadow moiré topography using a flatbed scanner. Optical Engineering 41 (8) : 1908-1911. ScholarBank@NUS Repository. https://doi.org/10.1117/1.1487853
Abstract: Flatbed scanners are high-quality digital image recording devices that are cost-effective and widely available. In this work we demonstrate their ability to register shadow moiré fringes for topographic analysis. The fringe image obtained in color had bluish and greenish regions that correspond, respectively, to the bright and dark fringes associated with the technique. The diffraction characteristic of light passing through gratings provided a ready explanation of this behavior. The gray-scale fringe image, obtained via direct conversion of the color pattern, had rather poor contrast. Processing this gray-scale image produced only marginal improvements in contrast. The approach of separating the color image into its blue and green components, followed by gray-scale conversion, subtraction, and other processing operations, generated images with significantly higher contrast. © 2002 Society of Photo-Optical Instrumentation Engineers.
Source Title: Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/67799
ISSN: 00913286
DOI: 10.1117/1.1487853
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