Patent ID: 8203604

Claim:
A calibration plate configured for revising an image capture apparatus of a vision measuring system that comprises a worktable configured for supporting the calibration plate, the calibration plate comprising: a quadrate portion; a zero marker on the quadrate portion, wherein the zero marker is an origin of a mechanism coordinate system, the mechanism coordinate system is a coordinate system of the worktable of the vision measuring system; and a plurality of calibration areas arranged on the quadrate portion, and each calibration area comprising a plurality of regions having the same shape and a plurality of reference points; wherein the plurality of calibration areas correspond to different magnification multipliers of the image capture apparatus; an image capture apparatus is controlled to focus on a calibration area of the calibration areas corresponding to a magnification multiplier to obtain an image of the calibration area, a center of the image of the calibration area is an origin of an image coordinate system, the image coordinate system is a coordinate system of the image of the calibration area corresponding to the magnification multiplier, a calibration parameter corresponding to the magnification multiplier is obtained according to the coordinates of the plurality of reference points in the image coordinate system and the mechanism coordinate system.