Projector with keystone distortion correction device and the trapezoid distortion correction apparatus of a projector

摘要

PPROBLEM TO BE SOLVED: To provide a projector having a trapezoidal distortion correcting device for calculating the inclination angle of a projector for correcting distortion of a video image by arithmetic operation using three-dimensional coordinates of a crossing point between the crossing line and the frame line of an image pickup range, on the basis of a picked-up image of the crossing line between a wall surface and a surface crossing the wall. PSOLUTION: Position information of the crossing point between at least two crossing lines 78, 79 in a horizontal direction between a wall surface 75 of a projection surface 70 and a ceiling 76 or a floor 77 crossing the wall surface and a frame line 82 of an image pickup screen of a solid-state image pickup element 53 is acquired as a three-dimensional coordinates where an image pickup lens optical axis is z-axis, a perpendicular direction is an y-axis and horizontal direction is an x-axis. By coordinates rotation operation by rotation around the y-axis and x-axis, the projection optical axis 27 of the projection device 20 of a projector 10 from a rotation angle around each of the axes for bringing the two crossing lines into a parallel state, and inclination angles are calculated in horizontal and vertical directions with the projection angel 70. PCOPYRIGHT: (C)2006,JPO&NCIPI