Abstract
A machine vision measurement model of line structured-light was established.Based on the improved camera calibration method,an accurate calibration method of structured-light plane was proposed.According to the distribution of the structured-light′s energy along the normal direction of the light′s plane,Gauss fitting method was used to extract the sub-pixel coordinates of the light stripe′s center point on the image.In the calibration,the local world coordinate system was established on the surface of the free-moving planar target.Then,the local world coordinates of the stripe′s center point,which were obtained by the parameters of the camera calibration,were translated into the camera coordinate system.Using the obtained calibration points on the light plane,the plane of the structured-light was estimated in the camera coordinate system.The factors that would affect the precision of the measurement model were fully considered in this method,which could achieve a large number of calibration points.From the measurement of standard gauge block and shaft diameter,this method has high precision in practice.
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