Calibration system for image capture apparatus and method thereof
First Claim
1. A calibration system to be used in an image capture apparatus, comprising:
- a calibration appliance with a plurality of mark points, said plurality of mark points being on the same plane, said plurality of mark points forming a line segment with a known length;
a feature extraction unit extracting at least three image feature points corresponding to said plurality of mark points from at least one image captured by said image capture apparatus, said image having said plurality of mark points; and
a processor calculating the inclination angle of said image capture apparatus and the height between said image capture apparatus and said plane based on said at least three image feature points and said known lengths;
wherein said plurality of mark points corresponding to said image feature points forms a corner with a known angle, two corners with unknown but equal angles, or two line segments with unknown but equal lengths.
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Accused Products
Abstract
A calibration system and a method to be used in an image capture apparatus are disclosed. The calibration system includes a calibration appliance, a feature extraction unit and a processor. The calibration appliance has a plurality of mark points. The plurality of mark points is on the same plane to form a line segment with a known length. The image capture apparatus captures an image. Then based on the captured image, the feature extraction unit extracts at least three image feature points corresponding to the mark points. The processor calculates the inclination angle of the image capture apparatus, and the height between the image capture apparatus and the plane. Besides a line segment with a known length, the mark points corresponding to the image feature points may form a corner with a known angle, two corners with unknown but equal angles, or two line segments with unknown but equal lengths. Convenience for the calibration system is therefore improved.
23 Citations
27 Claims
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1. A calibration system to be used in an image capture apparatus, comprising:
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a calibration appliance with a plurality of mark points, said plurality of mark points being on the same plane, said plurality of mark points forming a line segment with a known length;
a feature extraction unit extracting at least three image feature points corresponding to said plurality of mark points from at least one image captured by said image capture apparatus, said image having said plurality of mark points; and
a processor calculating the inclination angle of said image capture apparatus and the height between said image capture apparatus and said plane based on said at least three image feature points and said known lengths;
wherein said plurality of mark points corresponding to said image feature points forms a corner with a known angle, two corners with unknown but equal angles, or two line segments with unknown but equal lengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A calibration system to be used in a plurality of image capture apparatuses, comprising:
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a calibration appliance with a plurality of mark points, said plurality of mark points being on the same plane, and said plurality of mark points forming a line segment with a known length;
a feature extraction unit extracting at least three image feature points corresponding to said plurality of mark points from at least one image captured by said image capture apparatus, said image having said plurality of mark points;
a first arithmetic unit calculating the inclination angle of said image capture apparatus and the height between said image capture apparatus and said plane based on said at least three image feature points and said known length; and
a second arithmetic unit determining two mark points commonly captured by each pair of said image capture apparatuses, and calculating the rotation angle and the position translation between said plurality of image capture apparatuses based on said image feature points corresponding to said mark points, said inclination angles and said heights of said plurality of image capture apparatuses;
wherein said plurality of mark points corresponding to said image feature points forms a corner with a known angle, two comers with unknown but equal angle or two line segments with unknown but equal length. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A calibration method to be used in a plurality of image capture apparatuses, comprising:
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(a) disposing a calibration appliance with a plurality of mark points, said plurality of mark points being on the same plane, and said plurality of mark points forming a line segment with a known length, and a corner with a known angle, two corners with unknown but equal angles or two line segments with unknown but equal lengths;
(b) capturing at least one image having said plurality of mark points by an image capture apparatus, said an image capture apparatus not being calibrated. (c) extracting at least three image feature points corresponding to said plurality of mark points from said at least one image;
(d) calculating the inclination angle of said image capture apparatus, and the height between said image capture apparatus and said plane based on said at least three image feature points and said known length;
(e) repeating steps (b), (c) and (d) to calculate said inclination angles and said heights of said plurality of image capture apparatuses;
(f) determining two mark points commonly captured by each pair of said image capture apparatuses, and calculating the rotation angle and the position translation between said plurality of image capture apparatuses based on said image feature points corresponding to said mark points, said inclination angles and said heights of said plurality of image capture apparatuses. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification