| http://www.w3.org/ns/prov#value | - tion from a camera located in the front of the projector. [0008] However, such a technique of correcting the keystone distortion based on the screen as disclosed in the Japanese Patent Laid-Open No. 2000-241874 can only correct the distortion in an image projected within the range of the screen, but cannot correct the image distortion if an image is projected onto a region other than the screen, s
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