Patent ID: 8711213

Claim:
A correction information calculating device that calculates correction information representing a correspondence relationship between positions of pixels in an image projected onto projection areas of a projection surface from projectors each including an image forming element and positions of pixels in the image forming element, the correction information calculating device comprising: a correspondence information determining unit that: acquires correspondence information representing the correspondence relationship between identification patterns on the projection surface, and the projectors projecting the identification patterns by comparing relative positions of identification diagrams in an array of a plurality of the identification patterns inside a photographed image, the photographed image acquired by photographing a plurality of the identification diagrams arranged on the projection surface when the identification patterns, including the identification diagrams, are projected from a plurality of the projectors and a disposition information representing a correspondence relationship between relative positions of the projection areas in an array of a plurality of the projection areas according to the plurality of the projectors and the projectors projecting an image onto the projection areas; and a correction information calculating unit including first and second pattern detecting units which is different from first pattern detecting unit, wherein the first pattern detecting unit establishes a correspondence between a first projected pattern and a first projector based on a first diagram, and the second pattern detecting unit determines the positions of a plurality of characteristic points in a second diagram different from the first diagram projected by the projector determined by the first pattern detecting unit, the correction information calculating unit: calculates the correction information by associating and comparing, based on the correspondence information, the positions of the plurality of characteristic points defined in original data of characteristic point patterns, including the plurality of the characteristic points, the original data being supplied to the projectors, and the positions of the plurality of characteristic points inside the photographed image acquired by photographing the characteristic point patterns being projected based on the original data, wherein the characteristic point patterns projected from the plurality of the projectors are photographed at the same time.