﻿ 微分算子和直线拟合在十字丝中心定位中的应用

# 微分算子和直线拟合在十字丝中心定位中的应用Application of Differential Operator and Linear Fitting in Crosshair Center Pinpoint

Abstract: In order to satisfy the requirement of crosshair center pinpoint for lens decentration measurement, a crosshair center pinpoint method based on differential operator and linear fitting is proposed. First, the edges of crosshair in both X and Y directions can be obtained by using differential operator to compute the difference in both X and Y directions. Then, two linear equations in both X and Y directions are fitted with orthogonal least square method using the edges obtained. Finally, the intersection point of the two linear equations is used as the crosshair center. Experimental results indicate that the precision of the crosshair center pinpoint is less than one pixel in the images grabbed by the CCD whose resoluntion is 1292 × 964 pixel and pixel size is 3.75 μm × 3.75 μm and the precision of pinpoint is less than 2 μm in lens decentration measurement. It can satisfy the system requirements of non-contact, online, real time, higher precision and rapid speed, as well as strong anti-jamming and stabilization.

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