Method and device for camera calibration
First Claim
1. A method for camera calibration, the method comprising:
- detecting objects in a video sequence;
obtaining feature information from the detected objects;
extracting at least two groups of perspective horizontal parallel lines according to the obtained feature information;
estimating at least two horizontal vanishing points according to the at least two groups of perspective horizontal parallel lines;
defining a horizontal vanishing line by the at least two horizontal vanishing points; and
calculating calibration parameters of a camera according to the vanishing points and/or the vanishing line.
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Abstract
Techniques pertaining to methods and devices for calibrating camera parameters are disclosed. According to one aspect of the present invention, objects on an image are detected and features on the objects, such as the top of a person, are identified. Perspective parallel lines based on the object features are constructed and vanishing points from the converged perspective parallel lines are determined. A vanishing line is defined according to the vanishing points. The intrinsic parameters, such as focal length, and the extrinsic parameters, such as tilting and pan angles, of a camera are calibrated according to the vanishing points, the vanishing line and a reference object with known dimensions, or known camera angles, The calibrated camera parameters are used for accurate photogrammetric measurements and computer vision applications.
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Citations
14 Claims
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1. A method for camera calibration, the method comprising:
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detecting objects in a video sequence; obtaining feature information from the detected objects; extracting at least two groups of perspective horizontal parallel lines according to the obtained feature information; estimating at least two horizontal vanishing points according to the at least two groups of perspective horizontal parallel lines; defining a horizontal vanishing line by the at least two horizontal vanishing points; and calculating calibration parameters of a camera according to the vanishing points and/or the vanishing line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for camera calibration, the device comprising:
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an object detecting module configured for detecting objects from a video sequence captured by a camera; a feature-obtaining module configured for obtaining feature information of the detected objects; a parallel line extracting module configured for extracting at least two groups of perspective horizontal parallel lines according to the feature information of the detected objects; a vanishing point and vanishing line estimating module configured for estimating at lest two vanishing points according to the groups of perspective horizontal parallel lines, and defining a vanishing line by the two vanishing points; and a parameters calculating module configured for calculating calibration parameters of the camera according to the vanishing points and/or the vanishing line. - View Dependent Claims (11, 12, 13, 14)
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Specification