Comparison of some techniques for the subpixel location of discrete target images

Mark R. Shortis; Timothy A. Clarke; Tim Short

doi:10.1117/12.189136

6 October 1994 Comparison of some techniques for the subpixel location of discrete target images

Mark R. Shortis, Timothy A. Clarke, Tim Short

Proceedings Volume 2350, Videometrics III; (1994) https://doi.org/10.1117/12.189136
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

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.

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Mark R. Shortis, Timothy A. Clarke, and Tim Short "Comparison of some techniques for the subpixel location of discrete target images", Proc. SPIE 2350, Videometrics III, (6 October 1994); https://doi.org/10.1117/12.189136

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