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Proceedings Paper

Comparison of some techniques for the subpixel location of discrete target images
Author(s): Mark R. Shortis; Timothy A. Clarke; Tim Short
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Paper Abstract

Signalizing points of interest on the object to be measured is a reliable and common method of achieving optimum target location accuracy for many high precision measurement tasks. In photogrammetric metrology, images of the targets originate from photographs and CCD cameras. Regardless of whether the photographs are scanned or the digital images are captured directly, the overall accuracy of the technique is partly dependent on the precise and accurate location of the target images. However, it is often not clear which technique to choose for a particular task, or what are the significant sources of error. The research described in this paper describes aspects of target recognition, thresholding, and location. The results of a series of simulation experiments are used to analyze the performance of subpixel target location techniques such as: centroiding; Gaussian shape fitting; and ellipse fitting, under varying conditions.

Paper Details

Date Published: 6 October 1994
PDF: 12 pages
Proc. SPIE 2350, Videometrics III, (6 October 1994); doi: 10.1117/12.189136
Show Author Affiliations
Mark R. Shortis, Univ. of Melbourne (Australia)
Timothy A. Clarke, City Univ. London (United Kingdom)
Tim Short, City Univ. London (United Kingdom)

Published in SPIE Proceedings Vol. 2350:
Videometrics III
Sabry F. El-Hakim, Editor(s)

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