METHOD FOR MEASURING EXTERNAL SHAPE OF RECTANGULAR PLATE-LIKE OBJECT, AND METHOD FOR CALIBRATING RELATIVE POSITION OF IMAGE-CAPTURING MEANS

摘要

Provided is a method for measuring the external shape of a rectangular plate-like object being conveyed by use of a shape measurement device which is provided with four image-capturing means previously arranged corresponding to the four corners of the rectangular plate-like object and a storage means for storing the relative coordinates of the respective four image-capturing means.  The method is provided with a step of determining whether or not the rectangular plate-like object has reached a measurement section, a step of causing the four image-capturing means to capture the images including the corner portions at the respective four corners of the rectangular plate-like object having reached the measurement section, a step of computing corner post coordinates which are coordinate values from image original point of the four corners of the rectangular plate-like object on the basis of the captured images, and a step of computing the lengths of the four sides and the squareness of the four corners of the rectangular plate-like objects on the basis of the computed corner post coordinates and the relative coordinates stored in the storage means.