Patent ID: 8272747
Filing Date: 2012-09-25
Classification: G03B,H04N

Abstract:
1. A distortion detecting system detecting distortion of a projected image which is projected onto a projected surface by a projector, comprising: a photodetecting apparatus having a photodetector which includes a plurality of pixels two-dimensionally arranged on a photosensitive surface, and an imaging optical system which forms the projected image on the photosensitive surface, said photodetecting apparatus making the imaging optical system form a projected image of a reference brightness image, that is projected onto the projected surface by said projector, onto the photosensitive surface, said photodetecting apparatus further having a first signal processing section forming and outputting a first light intensity profile data that indicates a one-dimensional distribution of incident light intensity in a first direction on the projected image, and a second signal processing section forming and outputting a second light intensity profile data that indicates a one-dimensional distribution of incident light intensity in a second direction different from the first direction on the image; and an analyzing apparatus detecting distortion of the projected image by analyzing both of the first light intensity profile data in the first direction and the second light intensity profile data in the second direction that are extracted from the projected image, wherein the reference brightness image has three or more light regions in a dark region, all of the light regions being on the same straight line and aligned intervals between the adjacent light regions become equal, and wherein said analyzing apparatus detects, as first result, intervals between light intensity peaks in the first light intensity profile data, detects, as a second result, intervals between light intensity peaks in the second light intensity profile data, and detects the distortion of the projected image by comparing only the first and second results detected.