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Optical Engineering

Precise center location for light spot contour images of light emitting diode control points in light-pen vision coordinate measurement
Author(s): Tingfa Xu; Peng Zhao
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Paper Abstract

In a light-pen single-camera three-dimensional (3-D) coordinate vision measurement system, a key step is the fast and precise center location for the light spot contour images of the LED control points obtained by the charge-coupled device (CCD)camera. A novel center location scheme for the light spot contour images is proposed in this key step. This scheme uses a geodesic active contour model to obtain every light spot's contour edge simultaneously. Then the center coordinate of every light spot is measured using a subpixel scheme. Compared to the common scheme using the edge detection and the contour tracking, this scheme is highly precise and fast for the center location of every light spot in a CCD image.

Paper Details

Date Published: 1 December 2008
PDF: 9 pages
Opt. Eng. 47(12) 123602 doi: 10.1117/1.3041745
Published in: Optical Engineering Volume 47, Issue 12
Show Author Affiliations
Tingfa Xu, Beijing Institute of Technology (China)
Peng Zhao, Beijing Institute of Technology (China)

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