Method and Apparatus for Calibration of Multiple Projector Systems
First Claim
1. A method for estimating a location of a photodetector in a projector based two dimensional coordinate system, the projector projecting a two dimensional array of pixels and the photodetector comprising a sensing area, the method comprising:
- projecting a plurality of projection regions from the projector, and taking a photodetector measurement for each projection region, wherein the projected area of each projection region on the photodetector is less than the sensing area of the photodetector; and
estimating the location of the photodetector in the projector based two dimensional coordinate system using a weighted mean of the locations of the projection regions, wherein the location of each projection region in the projector based two dimensional coordinate system is weighted by the photodetector measurement for the respective projection region.
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Abstract
Disclosed is a method for improving the calibration of multiple projector systems in Spatial Augmented Reality systems where multiple projectors are used to project images directly onto objects of interest. The methods and system described herein improve the calibration of multiple projector systems in order to improve the alignment and clarity of projected images by reducing ghosting that can occur with poorly aligned projectors. The system uses a planar photodiode and the projector is used to project a plurality of projection regions, such as scan lines, across the planar photodetector and calculating the position based on weighting measurements by the measured light intensity and projected images in SAR.
29 Citations
35 Claims
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1. A method for estimating a location of a photodetector in a projector based two dimensional coordinate system, the projector projecting a two dimensional array of pixels and the photodetector comprising a sensing area, the method comprising:
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projecting a plurality of projection regions from the projector, and taking a photodetector measurement for each projection region, wherein the projected area of each projection region on the photodetector is less than the sensing area of the photodetector; and estimating the location of the photodetector in the projector based two dimensional coordinate system using a weighted mean of the locations of the projection regions, wherein the location of each projection region in the projector based two dimensional coordinate system is weighted by the photodetector measurement for the respective projection region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A non transitory processor readable medium comprising instructions for causing at least one processor to perform a method for estimating a location of a photodetector in a projector based two dimensional coordinate system, the projector projecting a two dimensional array of pixels and the photodetector comprising a sensing area, the method comprising:
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projecting a plurality of projection regions from the projector, and taking a photodetector measurement for each projection region, wherein the projected area of each projection region on the photodetector is less than the sensing area of the photodetector; and estimating the location of the photodetector in the projector based two dimensional coordinate system using a weighted mean of the locations of the projection regions, wherein the location of each projection region in the projector based two dimensional coordinate system is weighted by the photodetector measurement for the respective projection region. - View Dependent Claims (21)
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22. A photodetector for use in a calibrating a multiple projector system, comprising:
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a housing; a light sensor comprising a sensing area; a signal processing module for generating a measurement from the light sensor; a power supply module; and a communications module. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A system for estimating a location of a photodetector in a projector based two dimensional coordinate system, the system comprising:
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a projector wherein the projector projects a two dimensional array of pixels; at least one photodetector comprising a sensing area; and a computing apparatus comprising at least one processor and a memory, the memory comprising instructions to perform a method for estimating a location of each of the at least one photodetector in a projector based two dimensional coordinate system, the method comprising; projecting a plurality of projection regions from the projector, and taking a photodetector measurement for each projection region, wherein the projected area of each projection region on the photodetector is less than the sensing area of the photodetector; and estimating the location of the photodetector in the projector based two dimensional coordinate system using a weighted mean of the locations of the projection regions, wherein the location of each projection region in the projector based two dimensional coordinate system is weighted by the photodetector measurement for the respective projection region. - View Dependent Claims (34, 35)
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Specification