1 May 2007 Further improvement of edge location accuracy of charge-coupled-device laser autocollimators using orthogonal Fourier-Mellin moments
Author Affiliations +
Optical Engineering, 46(5), 057007 (2007). doi:10.1117/1.2735287
Abstract
In order to further improve edge location accuracies of charge-coupled-device laser autocollimators, we use rotation invariance and lower radial orders of orthogonal Fourier-Mellin moments to efficiently extract the characteristics of edges, set the edges in the vertical direction, and establish the expressions used for edge location. We accomplish this by analyzing the interrelationship of orthogonal Fourier-Mellin moments. We compensate errors caused by the differences between the masks selected (by correcting the locations in proportion to the dimensions of the masks selected) and by the differences between actual and ideal edge patterns (by correcting the bias errors in proportion to the distance from the center of the sampling area to the edge). Experimental results show that an edge location accuracy of 0.06 pixel can be achieved for straight lines, 0.08 pixel for curves, and ±0.12 pixel for an actual circular target acquired by a charge-coupled-device laser autocollimator. It is therefore concluded that the proposed method can be used as an efficient approach to achieve the higher edge location accuracies specified for such optoelectronic image measurements instruments as a charge-coupled-device laser autocollimator.
Jiubin Tan, Lei Ao, Ji-wen Cui, Wen-jing Kang, "Further improvement of edge location accuracy of charge-coupled-device laser autocollimators using orthogonal Fourier-Mellin moments," Optical Engineering 46(5), 057007 (1 May 2007). http://dx.doi.org/10.1117/1.2735287
JOURNAL ARTICLE
12 PAGES


SHARE
KEYWORDS
Charge-coupled devices

Autocollimators

Optical engineering

Target acquisition

CCD image sensors

Digital filtering

Electronic filtering

RELATED CONTENT

Human Factors And Automobile Instrument Panel Display Design
Proceedings of SPIE (October 24 1988)
Automatic measurement of blade profile
Proceedings of SPIE (May 29 2002)
An APS-based autonomous star tracker
Proceedings of SPIE (January 20 2005)
Calibration of CCD-based redox imaging for biological tissues
Proceedings of SPIE (February 27 2009)

Back to Top