CALIBRATION METHOD FOR IMAGE RENDERING DEVICE AND IMAGE RENDERING DEVICE

摘要

A calibration method for an image rendering device is provided which calibrates offset in the direction around an optical axis of an alignment camera and enables improvement of the accuracy of correction of image rendering offset relative to an image rendering medium. A calibration reference mark is photographed by an alignment camera and the amount of rotation of the alignment camera around its optical axis is calculated using coordinate data for the calibration reference mark in the camera field of view. Based on the calculated data, the readings taken by the alignment camera during alignment are corrected.