Method and arrangement for camera calibration
First Claim
Patent Images
1. An arrangement for calibrating a camera, comprising:
- a camera for recording a digital image, said camera including processing means for processing said digital image and calibrating said camera according to said processing, and;
a figure arranged to be recorded by said camera, said figure comprising a first portion having a continuous circular shape and a second portion with a plurality of circularly arranged spaced segments, said second portion is arranged around said first portion, said second portion arranged around said first portion.
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Abstract
An arrangement and method is set out which records a digitised image of a figure with the figure preferably comprising a black disk, which is surrounded by an arrangement of radial line segments. The method extracts edge points from the recorded image and performs a transform on the edge points to obtain a center of the figure. Then, a diameter of the disk is obtained to calculate the conversion factor, which represents the distance between the camera and the figure. The line segments may further comprise at least one bar code defining encoded information. The method provides a reliable calibration even under cluttered background conditions.
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25 Claims
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1. An arrangement for calibrating a camera, comprising:
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a camera for recording a digital image, said camera including processing means for processing said digital image and calibrating said camera according to said processing, and;
a figure arranged to be recorded by said camera, said figure comprising a first portion having a continuous circular shape and a second portion with a plurality of circularly arranged spaced segments, said second portion is arranged around said first portion, said second portion arranged around said first portion. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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2. The arrangement according to FIG. 1, wherein said processing means further comprises:
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means for performing an edge point transformation detection of said recorded image;
means for performing a Hough Transformation on said edge points;
means for obtaining a radius from said first portion; and
means for using said radius to provide a conversation factor representative of a distance between said camera and said figure.
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12. A method of calibrating a camera, comprising the steps of:
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digitally recording an image of a figure, said figure comprising a first portion having a continuous circular shape and a second portion having a plurality of circularly spaced segments;
extracting a set of edge points from said recorded image;
performing a transform on said edge points thereby obtaining an image center point; and
obtaining a diameter of said first portion to provide a conversion factor comprising a distance between said camera and said image.
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Specification