Patent ID: 7252386
Filing Date: 2007-08-07
Classification: H04N

Abstract:
1. A method of projecting an image with an image projector configured to project an image in response to an input image onto a virtual projection surface positioned in a predetermined positional relationship, the method comprising: an image capturing step of capturing an output image projected on an actual projection surface; an imaging information generating step of outputting imaging information that includes brightness information having a correlation to a brightness, according to the captured image; and a distortion correcting step of correcting a distortion of the output image in relation to the input image according to the imaging information, the distortion being caused by a slope between the virtual projection surface and the actual projection surface, wherein the distortion correcting step comprises: a correction image providing step of providing the image projector with a correction image for using in compensation of the distortion of output image; and an image processing step of determining a peak position movement amount that is a movement amount of a peak position from a peak position of the brightness of the virtual projection surface to a peak position of the brightness for the actual projection surface according to the imaging information, and also distorting in advance the input image so as to compensate for the distortion of the output image according to the determined peak position movement amount, wherein the correction image is configured such that an angle change amount of the peak position according to the peak position movement amount, seen from the image projector is closer to the angle of the slope than an all white pattern image.