Patent ID: 8439505

Claim:
A method for calculating a position adjustment amount of projected image comprising: displaying a first test pattern including at least four first feature points on a projection plane using light modulated by a first light modulation device; obtaining first image data by imaging the first feature points displayed on the projection plane using an image capturing device; displaying a second test pattern including at least one second feature point on the projection plane using light modulated by a second light modulation device; obtaining second image data by imaging the second feature point displayed on the projection plane using the image capturing device; calculating correspondence relationships between positions corresponding to the first feature points in a first coordinate system defined in the first light modulation device and positions corresponding to the first feature points in an image-capturing coordinate system defined in the image capturing device, based on the first image data; calculating an adjustment amount according to a misalignment amount between a position corresponding to the second feature point in the first coordinate system and a position corresponding to the second feature point in a second coordinate system defined in the second light modulation device, based on the correspondence relationships and the second image data.