Display method and apparatus having distortion correction
AssigneeCanon Kabushiki Kaisha
InventorsShinichi Sunakawa, Kazutoshi Shimada, Eisaku Tatsumi, Shigeki Mori, Kazuhiro Matsubayashi, Takashi Harada, Katsuhiko Nagasaki, Ryoji Fukuda
Life of this patent
Estimating the term…
Abstract
A display method and apparatus for displaying information by projecting a light onto an external projection plane is capable of detecting a deviation amount of a displayed image projected on the projection plane with respect to the display apparatus. Output image data is changed based on the detected deviation amount to offset a distortion of the displayed image, which is displayed using the changed output image data.
Claims8
A display apparatus for displaying information by projecting a light onto an external projection plane, comprising:
- projection means for projecting a quadrangular image on the projection plane;
- angle detecting means for detecting four angles of the quadrangular image;
- recognizing means for recognizing the image projected on the projection plane;
- deviation detecting means for detecting a deviation amount of the image on a basis of the four angles detected by said angle detecting means;
- changing means for changing output image data so as to offset a distortion of the displayed image on the basis of the deviation amount detected by said detecting means;
- and
- display control means for controlling said projection means to display the image by using the image data changed by said changing means, wherein
- said projection means and said detecting means are arranged in a single body.
A display apparatus for displaying information by projecting a light onto an external projection plane, comprising:
- obtaining means for repeating processes such that a quadrangular image displayed on the projection plane is fetched, four angles of the quadrangular image are detected, the projected image is recognized, its distortion is detected based on the four angles detected, image data is corrected so as to eliminate the distortion, and the image is displayed on the projection plane, thereby obtaining a proper correction amount to eliminate the distortion;
- changing means for changing output image data on the basis of the correction amount obtained by said obtaining means;
- and
- display means for displaying the image onto the projection plane by using the output image data changed by said changing means.
A display method of displaying information by projecting a light onto an external projection plane, comprising the steps of:
- projecting a quadrangular image on the projection plane via a projector;
- detecting four angles of the quadrangular image;
- recognizing the image projected on the projection plane;
- detecting a deviation amount of the image on a basis of the four angles detected;
- changing output image data on the basis of a deviation amount detected in said detecting step;
- and
- controlling the image projection to display the image by using the image data changed in said changing step.
A display method of displaying information by projecting a light onto an external projection plane, comprising the steps of:
- repeating processes such that a quadrangular image displayed on the projection plane is fetched, four angles of the quadrangular image are detected, recognizing the projected image, detecting distortion based on the four angles detected, correcting image data so as to eliminate the distortion, and displaying the image on the projection plane, thereby obtaining a proper correction amount to eliminate the distortion;
- changing output image data on the basis of the correction amount obtained in the obtaining step;
- and
- displaying the image onto the projection plane by using the output image data changed in the changing step.
Dependencies are inferred from the claim text.