Back to results
US 2009/0268104 A1Published application
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;
- 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 a vertical tilt angle βv and a 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, so that the image can be corrected internally to the projector.
2 more elements
A projector, comprising:
- means for projecting an image;
- 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 a vertical tilt angle βv and a 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, so that the image can be corrected internally to the projector.
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;
- computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh, and
- deforming an image using the keystone correction corner points so that the deformed image, when projected, appears undeformed.
2 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;
- computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh;
- and
- deforming an image using the keystone correction corner points so that the deformed image, when projected, appears undeformed.
3 more elements
Dependencies are inferred from the claim text.