Keystone correction derived from the parameters of projectors
First Claim
Patent Images
1. 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 β
v, through a horizontal plane by horizontal tilt angle β
h, and to rotate the horizontal plane by vertical tilt angle β
v;
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 β
v and the 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.
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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, the image projector operative to be rotated through a vertical plane by a vertical tilt angle β
v, through a horizontal plane by horizontal tilt angle β
h, and to rotate the horizontal plane by vertical tilt angle β
v;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 β
v and the 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. - 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, including means for rotating through a vertical plane by a vertical tilt angle β
v and through a horizontal plane by a horizontal tilt angle β
h and means for rotating the horizontal plane by vertical tilt angle β
v;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 β
v and the 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. - 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;rotating the projector through a vertical plane by vertical tilt angle β
v and through a horizontal plane by horizontal tilt angle β
h;rotating the horizontal plane through the vertical plane by vertical tilt angle β
v; andcomputing keystone correction corner points using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h. - 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;rotating the projector through a vertical plane by vertical tilt angle β
v and through a horizontal plane by horizontal tilt angle β
h;rotating the horizontal plane through the vertical plane by vertical tilt angle β
v; andcomputing keystone correction corner points using the set of inherent parameters, the vertical tilt angle β
v, and the horizontal tilt angle β
h. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification