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Extracting the centroid of the light spot by two-dimensional sigmoid fitting
Hui Zhang1,2,3; Guoping Li1,2; Yong Zhang1,2; Shouwei Hu1,2
2018-10
Source PublicationOptical Engineering
Volume57Issue:10Pages:104113(1-7)
Abstract
Precise and stable centroid estimation is crucial for many tasks that require locating a light spot.We present an algorithm for fitting a deformed sigmoid function (two-dimensional sigmoid function) to the edge shape and profiled intensity of a light spot. The information of the spot (such as the center position,the size, and the tilt,) can be obtained by this fitting.
The robustness of our proposal against noise, contrast,aspect ratio, and tilt is assessed compared with the adaptive circle–ellipse fitting and the centroid weighted Kalman filter algorithm, and the performance is validated experimentally.
We show that our proposed algorithm provides better results than these algorithms, especially with regards to noise immunity. It is an effective and precise algorithm for estimating the centroid location of a light spot and can be used in a wide variety of optical sensing applications. 
KeywordCentroid Estimation Subpixel Edge Detection Intensity Profile Fitting Optical Sensing
Subject Area天文技术与方法
Language英语
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/1546
Collection中国科学院南京天文光学技术研究所_期刊论文
望远镜新技术研究室_期刊论文
Affiliation1.南京天文光学技术研究所
2.天文光学技术重点实验室
3.中国科学院大学
Recommended Citation
GB/T 7714
Hui Zhang,Guoping Li,Yong Zhang,et al. Extracting the centroid of the light spot by two-dimensional sigmoid fitting[J]. Optical Engineering,2018,57(10):104113(1-7).
APA Hui Zhang,Guoping Li,Yong Zhang,&Shouwei Hu.(2018).Extracting the centroid of the light spot by two-dimensional sigmoid fitting.Optical Engineering,57(10),104113(1-7).
MLA Hui Zhang,et al."Extracting the centroid of the light spot by two-dimensional sigmoid fitting".Optical Engineering 57.10(2018):104113(1-7).
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