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US 7,581,839 B1Granted
Keystone correction derived from the parameters of projectors
AssigneePixelworks, Inc.
InventorsZhongde Wang, Tianbing Brian Teng
Life of this patent
Estimating the term…
Abstract
A projector determines horizontal and vertical tilt angles. Using the tilt angles and the inherent properties of the projector, keystone correction corner points for the image can be computed. The keystone correction corner points can be used to perform keystone correction on the image.
Claims28
A projector, comprising:
- an image projector to project an image, the image projector operative to be rotated through a vertical plane by a vertical tilt angle βv, through a horizontal plane by horizontal tilt angle βh, and to rotate the horizontal plane by vertical tilt angle βv;
- a set of inherent parameters including a horizontal resolution Wn0, a vertical resolution Hn0, a depth d, and a vertical offset db;
- a receiver to receive the vertical tilt angle βv and the horizontal tilt angle βh;
- and
- a corrector to compute keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh.
2 more elements
A projector, comprising:
- means for projecting an image, including means for rotating through a vertical plane by a vertical tilt angle βv and through a horizontal plane by a horizontal tilt angle βh and means for rotating the horizontal plane by vertical tilt angle βv;
- means for determining a set of inherent parameters including a horizontal resolution Wn0, a vertical resolution Hn0, a depth d, and a vertical offset db;
- means for receiving the vertical tilt angle βv and the horizontal tilt angle βh;
- and
- means for computing keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh.
2 more elements
A method for performing keystone correction in a projector, comprising:
- determining a set of inherent parameters for the projector, the set of inherent parameters including a horizontal resolution Wn0, a vertical resolution Hn0, a depth d, and a vertical offset db;
- determining a vertical tilt angle βv;
- determining a horizontal tilt angle βh;
- rotating the projector through a vertical plane by vertical tilt angle βv and through a horizontal plane by horizontal tilt angle βh;
- rotating the horizontal plane through the vertical plane by vertical tilt angle βv;
- and
- computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh.
4 more elements
An article comprising a machine-accessible media having associated data, wherein the data, when accessed, results in a machine performing:
- determining a set of inherent parameters for the projector, the set of inherent parameters including a horizontal resolution Wn0, a vertical resolution Hn0, a depth d, and a vertical offset db;
- determining a vertical tilt angle βv;
- determining a horizontal tilt angle βh;
- rotating the projector through a vertical plane by vertical tilt angle βv and through a horizontal plane by horizontal tilt angle βh;
- rotating the horizontal plane through the vertical plane by vertical tilt angle βv;
- and
- computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh.
4 more elements
Dependencies are inferred from the claim text.