Optics: image projectors – Distortion compensation
Reexamination Certificate
2005-08-23
2005-08-23
Dowling, William C. (Department: 2851)
Optics: image projectors
Distortion compensation
C353S070000, C348S807000
Reexamination Certificate
active
06932479
ABSTRACT:
To provide an image processing system and the like which can correct a distortion in a projected image automatically and adequately, a projector has an area sensor section which senses a sensing region onto which an image is projected and outputs sensing information; a storage section which stores angle correction data in which the ratio of average luminance values for a plurality of different regions in the projection area is associated with derivation coordinates for deriving coordinates of the projection area, and also stores coordinate data indicating the derivation coordinates for the projection area; luminance-distribution analyzing section which refers to the angle correction data based on the sensing information and depending on the luminance distribution in the projection area and corrects the derivation coordinates in the coordinate data, based on the angle correction data; and a distortion correction section which corrects the image signals so that the distortion in the projected image is corrected, based on the coordinate data.
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Rahul Sukthankar et al.; “Automatic Keystone Correction for Camera-Assisted Presentation Interfaces”; XP-001148734; Oct. 14, 2000; pp 607-614.
J. Goel et al.; 18.4: Correcting Distortions in Digital Displays and Projectors Using Real-Time Digital Image Warping; XP008014374; SID 99 DIGEST; May 18, 1999; pp 232-241.
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Kobayashi Masanobu
Wada Osamu
Dowling William C.
Oliff & Berridg,e PLC
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