Projection image correction system and projection image correction method

摘要

A projection image correction system includes a section that detects intersection coordinates in a corrected sheet image, a section that calculates a first projective transformation matrix for transformation of the detected intersection coordinates into intersection coordinates stored in advance, a section that generates two spatial code images from the corrected positive and negative images of Gray code patterns, a section that acquires intersections of brightness profiles in the positive and negative images, a section that acquires coordinates of an intersection of boundary lines in the two spatial code images, a section that calculates a second projective transformation matrix by which transformation is performed so that the acquired intersection coordinates, transformed by the first projective transformation matrix, are distributed over the entire region, and a section that transforms, using the second projective transformation matrix, image data to be outputted to a projector.