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US 9,794,537 B2Granted
Image processing method and image projection device
AssigneeSony Corporation
InventorsNaoki Kobayashi, Yohsuke Kaji, Naomasa Takahashi, Takashi Norizuki
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Abstract
There is provided an image processing method including detecting a distorted image before correction projected on a screen by a projection-type image display device, searching for a same shape as an input image having a maximum area inside the distorted image, and correcting the input image in a manner that the distorted image becomes the searched-for shape having the maximum area.
Claims12
An image processing method, comprising:
- detecting a distorted image before correction projected on a screen by a projection-type image display device;
- detecting a position and a size of a distorted quadrangle projected on the screen;
- searching for a same shape as an input image having a maximum area inside the distorted image;
- searching for a rectangle having the maximum area with a same aspect ratio as the input image inside the distorted quadrangle;
- searching for a center position from which a minimum value of a distance, in a direction of a diagonal line to a side of the distorted quadrangle, is maximum;
- determining a maximum rectangle with the same aspect ratio inscribed in the distorted quadrangle with the center position, as the rectangle having the maximum area;
- and
- correcting the input image in a manner that the distorted image becomes the searched-for shape having the maximum area.
5 more elements
An image projection device, comprising:
- a projection unit configured to project an input image;
- a detection unit configured to:
- detect a distorted image before correction projected on a screen by a projection-type image display device, and
- detect a position and a size of a distorted quadrangle projected on the screen;
- a search unit configured to search for a same shape as the input image having a maximum area inside the distorted image;
- a boundary condition calculation unit configured to calculate boundary conditions regarding four sides of the distorted quadrangle;
- a solution candidate calculation unit configured to calculate, for each of the four sides of the distorted quadrangle, a solution candidate satisfying the boundary conditions of all sides other than a focused side;
- an optimum solution selection unit configured to select an optimum solution among solution candidates calculated for the four sides of the distorted quadrangle;
- and
- a correction unit configured to correct the input image in a manner that the distorted image becomes the searched-for shape having the maximum area.
7 more elements
Dependencies are inferred from the claim text.