MEASUREMENT METHOD OF POSITION OR TILT OF PROJECTION SURFACE AGAINST PROJECTION OPTICAL SYSTEM, CORRECTION METHOD OF PROJECTION IMAGE USING THE MEASUREMENT METHOD, AND PROJECTOR FOR PERFORMING THE CORRECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide the technology for easily and precisely measuring an object to be projected by using projected light of a projection optical system.;SOLUTION: A projection optical system 150 of a projector 100 projects a pattern image MI for measurement which includes a measurement line LM1 onto a projection screen SC. An image pickup part 180 photographs a projected measurement projection image MIp. An image pickup measurement line detection part 121 detects from a photography image SI a picked up image measurement line LM1s corresponding to the measurement line LM1. A projection measurement line detection part 122 obtains a projection measurement line LM1p on the projection screen SC from a picked up image measurement line LM1 and determines a position and a tilt angle of the projection surface. The projection measurement line LM1p is obtained as an intersection of a virtual plane PA defined by a beam representing the measurement line LM1 and a virtual plane SA defined by a main point PP of an image pickup part 180 and an image pickup measurement line LM1s.;COPYRIGHT: (C)2010,JPO&INPIT