KEYSTONE CORRECTION DERIVED FROM THE PARAMETERS OF PROJECTORS
First Claim
Patent Images
1. 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 β
v and a horizontal tilt angle β
h; and
a corrector to compute keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h, so that the image can be corrected internally to the projector.
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Accused Products
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.
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Citations
28 Claims
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1. A projector, comprising:
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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 β
v and a horizontal tilt angle β
h; anda corrector to compute keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h, so that the image can be corrected internally to the projector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A projector, comprising:
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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 β
v and a horizontal tilt angle β
h; andmeans for computing keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h, so that the image can be corrected internally to the projector. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for performing keystone correction in a projector, comprising:
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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 β
v;determining a horizontal tilt angle β
h;computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h, anddeforming an image using the keystone correction corner points so that the deformed image, when projected, appears undeformed. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. An article comprising a machine-accessible media having associated data, wherein the data, when accessed, results in a machine performing:
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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 β
v;determining a horizontal tilt angle β
h;computing keystone correction corner points using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h; anddeforming an image using the keystone correction corner points so that the deformed image, when projected, appears undeformed. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification