Method and system for camera autocalibration
First Claim
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1. A method for calibrating a projective camera, said method comprising:
- acquiring an observation set by detecting at least one object on a substantially flat ground plane within a field of view;
determining a noise function for the observation set based on a foot-to-head homography between a two-dimensional foot location and a corresponding two-dimensional head location the foot-to-head homography analyzed to determine a homology having an eigenvector, two unit eigenvalues, and a non-unit eigenvalue; and
performing a projective camera calibration using the determined noise function.
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Abstract
A method for calibrating a projective camera is provided. The method includes acquiring information by detecting at least one object on a substantially flat ground plane within a field of view. A projective camera calibration is performed. A measurement uncertainty is considered to yield a plurality of camera parameters from the projective camera calibration.
42 Citations
19 Claims
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1. A method for calibrating a projective camera, said method comprising:
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acquiring an observation set by detecting at least one object on a substantially flat ground plane within a field of view; determining a noise function for the observation set based on a foot-to-head homography between a two-dimensional foot location and a corresponding two-dimensional head location the foot-to-head homography analyzed to determine a homology having an eigenvector, two unit eigenvalues, and a non-unit eigenvalue; and performing a projective camera calibration using the determined noise function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for calibrating a projective camera, said method comprising:
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acquiring image data by detecting at least one object on a ground plane within a field of view; determining a foot-to-head homography using a vanishing point and a horizon plane; and performing a projective camera calibration using the determined foot-to-head homography, the foot-to-head homography analyzed to determine an estimated foot-to-head homology having an eigenvector, two unit eigenvalues, and a non-unit eigenvalue. - View Dependent Claims (15, 16, 17, 18)
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19. A surveillance system comprising:
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an object detector configured to process a video stream and report a rectangular foreground region; and a processor configured to; process the reported foreground region to extract a foot location estimate on a ground plane and a corresponding head location estimate, the extracted estimates based on a foot-to-head homology having an eigenvector, two unit eigenvalues, and a non-unit eigenvalue; perform a projective camera calibration based on at least one of the foot location estimate and the head location estimate; and output a plurality of camera parameters based on the projective camera calibration.
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Specification