测绘科学技术学报2012，Vol.29Issue(2)：122-126,5.DOI:10.3969/j.issn.1673-6338.2012.02.011
星点中心高精度质心定位算法
High-Accuracy Centroid Algorithm of Star Points
摘要
Abstract
Centroid algorithm is common used in star point centers calculation. An in-depth study was made to improve the accuracy of the centroid algorithm. The universal model of centroid algorithm was proposed based on 3 different formulae of centroid algorithm. And two parameters in this model the threshold T and the exponent of gray-weighted k could greatly influence the accuracy of centroid algorithm. The relationship between the accuracy of centroid algorithm and the parameters T and k was analyzed with both simulated and actual star images, and the same conclusions were obtained. When T and k increasing from 0, the centroid error went down in first and then up. With T and k being background gray and 2. 0 respectively, the minimum centroid error was obtained. T cannot be set too big to reserve enough information, but the same high-accuracy purpose could be reached through increasing k . The accuracy could increase more than 25 % using the appropriate T and k .关键词
星点中心/质心法/统一模型/阈值/灰度加权Key words
star point centers/ centroid algorithm/ universal model/ threshold/ gray-weighted分类
天文与地球科学引用本文复制引用
原玉磊,郑勇,杜兰..星点中心高精度质心定位算法[J].测绘科学技术学报,2012,29(2):122-126,5.基金项目
国家自然科学基金项目(10878025). （10878025）
