| 摘要 |
<P>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. <P>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. <P>COPYRIGHT: (C)2010,JPO&INPIT |
