A NEW ESTIMATION METHOD FOR UNCERTAINTY OF CIRCULAR MARK LOCATION OPERATOR
Yan Lili 1,2) ; Gao Jingxiang 1,2) ;and Sun Jiuyun 1,2)
1) Key Laboratory of Resources and Environment Information Engineering of Jiangsu Province, Xuzhou 2211162) School of Environment and Spatial Informatics,China University of Mining and Technology, Xuzhou 221116
Abstract A new center positioning algorithm of circular mark was put forward,which can fit the ellipse parameters by nonlinear least squares. It improved the ellipse edge detection method in the subpixel positioning algorithm. Moreover the estimating formula for mark location uncertainty was derived, and confidence interval in a certain confidence level was calculated by use of the Monte Carlo integration. An example certificates that the new location algorithm can achieve about 0.02 pixel positioning accuracy which rises nearly 10 times than that with the sub-pixel positioning operator when the photogrammetric scale is 1:75.
