Algorithm for sub-pixel line width measurement based on the orthogonal Legendre moment

doi:10.16511/j.cnki.qhdxxb.2016.22.012

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Abstract Line width measurements are of great importance for detecting small objects. An algorithm is developed for sub-pixel line width measurements based on the orthogonal Legendre moment. The line width is converted into the sum of two different symmetrical line widths. The 0th, 2nd and 4th order orthogonal Legendre moments are used to develop expressions for the symmetrical line widths. Template coefficients of the moments are derived for analyzing digital images and the principle error is analyzed and corrected. Tests of the algorithm for measuring the line widths of standard particles in ampoules show that the algorithm is accurate and efficient.

Keywords line width measurement Legendre sub-pixel

ZTFLH:

TP391

Issue Date: 15 February 2016

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	WANG Boxiong
	YANG Chunyu
	LI Wei
	QIN Yao

Cite this article:

WANG Boxiong,YANG Chunyu,LI Wei, et al. Algorithm for sub-pixel line width measurement based on the orthogonal Legendre moment[J]. Journal of Tsinghua University(Science and Technology), 2016, 56(2): 218-222.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2016.22.012 OR http://jst.tsinghuajournals.com/EN/Y2016/V56/I2/218

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