A Sub-Pixel Extraction Method for the Center of the Circular Structure from Spot Array Calibration Target

Yang Chuan Liu; Xin Gao; Chuan Xu; Wei Wei Fu; Yun Teng; Hong Cheng Yang; Tao Zhang

doi:10.4028/www.scientific.net/AMM.236-237.1090

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 236-237A Sub-Pixel Extraction Method for the Center of...

A Sub-Pixel Extraction Method for the Center of the Circular Structure from Spot Array Calibration Target

Abstract:

The imaging measurement system must be calibrated before application. In calibration procedure, sub-pixel center extraction is the crucial step for the final accuracy. In this paper, a new sub-pixel extraction method is proposed. Edge detection at pixel level is obtained using LOG operator, then sub-pixel edge detection is realized using the Facet model. Finally, the least squares ellipse fitting is operated on the sub-pixel edge to determine the sub-pixel center. Experiment on a series of simulated images indicates that this algorithm is able to realize the center location accuracy of 0.01-0.02 pixel, and meets the requirement of sub-pixel level.

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Periodical:

Applied Mechanics and Materials (Volumes 236-237)

Pages:

1090-1094

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.236-237.1090

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Online since:

November 2012

Authors:

Yang Chuan Liu, Xin Gao, Chuan Xu, Wei Wei Fu, Yun Teng, Hong Cheng Yang, Tao Zhang

Keywords:

Calibration Target, Ellipse Fitting, Facet Model, Log, Spot Array, Sub-Pixel Center

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