VIDEO CAMERA PERSPECTIVE CALCULATION
First Claim
1. A video camera perspective calculator comprising:
- a calibration object detector arranged to detect a calibration object in video data representing a scene observed by a video camera, and arranged to gather object data for the detected calibration object at a multiplicity of positions; and
an automatic plane calculator, in communication with the calibration object detector, arranged to calculate the perspective of the camera based on gathered object data from the calibration object detector for at least one calibration object at a multiplicity of positions.
1 Assignment
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Accused Products
Abstract
A method and system are provided for automatic calibration of a video camera by providing automatic perspective calculation. A calibration object detector is arranged to detect a calibration object in video data representing a scene observed by a video camera, and arranged to gather object data for the detected calibration object at a multiplicity of positions, such as three or more positions. The calibration object detector can include an automatic moving object detector and/or a static object detector. An automatic plane calculator is in communication with the calibration object detector and arranged to calculate the perspective of the camera based on gathered object data for at least one calibration object at a multiplicity of positions. The automation provided can enhance the operation of video analytics systems and reduce errors that can be introduced when an unskilled operator manually enters parameters on which the perspective is estimated.
19 Citations
13 Claims
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1. A video camera perspective calculator comprising:
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a calibration object detector arranged to detect a calibration object in video data representing a scene observed by a video camera, and arranged to gather object data for the detected calibration object at a multiplicity of positions; and an automatic plane calculator, in communication with the calibration object detector, arranged to calculate the perspective of the camera based on gathered object data from the calibration object detector for at least one calibration object at a multiplicity of positions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A video camera calibration kit comprising:
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a calibration object including two areas having contrasting visual appearance and easily distinguishable from a surrounding scene; a calibration object detector arranged to detect the calibration object in video data representing a scene observed by a video camera and to gather position data for the detected calibration object at a multiplicity of positions, the calibration object detector including a memory storing a known size and shape of the calibration object; and an automatic plane calculator, in communication with the calibration object detector, arranged to calculate the perspective of the camera based on gathered object data from the calibration object detector for at least one calibration object at a multiplicity of positions. - View Dependent Claims (9, 10)
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11. A method of providing one or more calibration tools for calculating a perspective of a video camera, comprising:
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providing an automatic calibration tool arranged to automatically calibrate the camera by calculating a perspective based on observed objects moving within the camera'"'"'s field of view; providing a semi-automatic calibration tool to be used in conjunction with a calibration object to calibrate the camera by calculating the perspective based on automatic detection of the calibration object at a multiplicity of positions in the camera'"'"'s field of view; and providing a manual calibration tool to receive camera calibration parameters manually entered by a user and to calculate the perspective based on the manually entered parameters. - View Dependent Claims (12, 13)
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Specification