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Optical Engineering

Iteration-based direct ellipse-specific algebraic fitting method of incomplete spots for onsite three-dimensional measurement
Author(s): Zhenxing Wang; Zhuoqi Wu; Xijin Zhen; Rundang Yang; Juntong Xi
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Paper Abstract

The direct ellipse-specific algebraic fitting (DESAF) method proposed by Fitzgibbon is a classical method to fit an ellipse from discrete points. Generally, for a complete spot, an ellipse, which coincides well with the complete contour of the spot, can be fitted by DESAF. However, for an incomplete spot damaged by some noises such as nonuniform optical surfaces, depth steps, and occlusion, DESAF would fit an incorrect ellipse which could not accurately match the complete contour of the spot. We analyze this problem encountered in the onsite three-dimensional measurement of hull plates and propose a method to remove these outlier points from the contours of incomplete spots. The experiments of computer simulated data and real data demonstrate that the proposed method can dramatically remove the outlier points from the contour and improve the detection accuracy of the center of the incomplete spot.

Paper Details

Date Published: 28 January 2015
PDF: 10 pages
Opt. Eng. 54(1) 013109 doi: 10.1117/1.OE.54.1.013109
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Zhenxing Wang, Shanghai Jiao Tong Univ. (China)
Zhuoqi Wu, Shanghai Jiao Tong Univ. (China)
Xijin Zhen, Shanghai Shipbuilding Technology Research Institute (China)
Rundang Yang, Shanghai Shipbuilding Technology Research Institute (China)
Juntong Xi, Shanghai Jiao Tong Univ. (China)

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