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	Improving ellipse fitting via multi-scale smoothing and key-point searching 期刊论文 OAI收割 PATTERN RECOGNITION, 2024, 卷号: 151, 页码: 15 作者: Chen, Xiao-Diao; Qian, Cheng; Zhao, Mingyang; Yong, Jun -Hai; Yan, Dong-Ming \| 收藏 \| 浏览/下载：44/0 \| 提交时间：2024/07/03 Ellipse fitting Least-squares RANSAC Multi-scale smoothing Key-point searching
	基于体外标志物的放疗患者位移监测方法期刊论文 OAI收割激光与光电子学进展, 2023, 卷号: 60 作者: 王妍璐; 何枫; 侯再红; 靖旭; 程乙轮 \| 收藏 \| 浏览/下载：15/0 \| 提交时间：2023/11/10 medical optics and biotechnology image processing displacement monitoring in vitro markers least squares ellipse fitting precise radiotherapy 医用光学与生物技术图像处理位移监测体外标志物最小二乘椭圆拟合精确放疗
	A sub-pixel extraction method for the center of the circular structure from spot array calibration target (EI CONFERENCE) 会议论文 OAI收割 2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China 作者: Liu Y.; Zhang T.; Yang H.; Gao X.; Liu Y. 收藏 \| 浏览/下载：75/0 \| 提交时间：2013/03/25 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. (2012) Trans Tech Publications Switzerland.