Method and device for camera calibration
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United States of America Patent
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Oct 28, 2014
Grant Date -
Nov 25, 2010
app pub date -
May 21, 2010
filing date -
May 21, 2009
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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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