GEOMETRIC CALIBRATION APPARATUS FOR CORRECTING IMAGE DISTORTIONS ON CURVED SCREEN, AND CALIBRATION CONTROL SYSTEM AND METHOD USING THE SAME
First Claim
1. A geometric calibration apparatus for correcting distortion of images projected from a plurality of projectors to a curved screen in a rear projection type multi-projection display, the apparatus comprising:
- a high resolution camera photographing unit images provided from the plurality of projectors to a hemispherical screen;
a pan-and-tilt controller controlling the high resolution camera such that the unit images are photographed in a preset order; and
a geometric calibration software execution PC including a calibration control software for measuring the degree of image distortion between the unit images provided from the plurality of projectors to the hemispherical screen to correct the image distortion.
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Accused Products
Abstract
Provided are a geometric calibration apparatus for correcting image distortions of a curved screen, and a calibration control system and method using the same. In the calibration control system for correcting the image distortions of the curved screen, a high resolution camera including a pan-and-tilt controller is installed at a center portion of a front direction of a hemispherical screen in order to well correct the distortion of the images projected from multi-projectors to a hemispherical screen. The calibration control system compares a partially photographed image with a reference image to generate a new coordinate map. Therefore, an offset between unit images projected on the hemispherical screen is removed to efficiently display an extra large image.
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Citations
19 Claims
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1. A geometric calibration apparatus for correcting distortion of images projected from a plurality of projectors to a curved screen in a rear projection type multi-projection display, the apparatus comprising:
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a high resolution camera photographing unit images provided from the plurality of projectors to a hemispherical screen; a pan-and-tilt controller controlling the high resolution camera such that the unit images are photographed in a preset order; and a geometric calibration software execution PC including a calibration control software for measuring the degree of image distortion between the unit images provided from the plurality of projectors to the hemispherical screen to correct the image distortion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19)
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10. A calibration control system comprising:
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a plurality of projector units including a pair of image control PCs transmitting unit images and a pair of projectors providing the unit images; a hemispherical screen displaying the unit images provided from the plurality of projector units; and a geometric calibration apparatus correcting image distortions of a curved screen to generate a new coordinate map based on a photographing result of an image projected on the hemispherical screen. - View Dependent Claims (11, 12, 13, 14)
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15. A calibration control method using a geometric calibration apparatus for correcting distortion of images projected from projectors in a multi-projection display having a rear projection type hemispherical screen, the calibration control method comprising:
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setting a right upper surface of a front surface of the hemispherical screen as a reference screen, and an image projected on the reference screen as a reference image; determining a calibration order of remaining images except the reference image; partially photographing the remaining images using a high resolution camera in pre-determined order; comparing the partially photographed images with the previously stored reference image to measure the degree of image distortion and calculate a calibration value based on the measured degree of the image distortion; applying the calculated calibration value and recalculating coordinate maps of the partially photographed images to generate a new coordinate map; and changing positions of the projectors using the new coordinate map to correct the image distortion. - View Dependent Claims (16, 17)
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Specification