Patent ID: 8237790
Filing Date: 2012-08-07
Classification: G01B

Abstract:
1. A computer-implemented method for positioning a portion of an object to be measured by an image measuring machine comprising a digital camera positioned adjacent to a charge coupled device (CCD) lens of the image measuring machine, the method comprising: setting positioning parameters corresponding to different positions of the digital camera on a Z-axis of a world coordinate system, wherein the positioning parameters are coefficients of conversion formulas between a plane of the CCD lens and a plane of the digital camera; receiving an image of the object captured by the digital camera; selecting corresponding positioning parameters according to a position of the digital camera on the Z-axis; selecting a point of the portion of the object in the image; calculating coordinates of the selected point in the plane of the CCD lens according to the selected positioning parameters and the conversion formulas between the plane of the CCD lens and the plane of the digital camera; and controlling the CCD lens of the image measuring machine to move to a position corresponding to the calculated coordinates so as to position the CCD lens on the portion of the object.