METHOD OF CALIBRATING VIDEO SYSTEM FOR MONITORING OBJECTS ON FLAT AREA Russian patent published in 2017 - IPC H04N5/232 G06K9/66 H04N17/00 

FIELD: physics, measurement technology.

SUBSTANCE: invention relates to video measuring equipment for constructing fixed measuring video systems with event monitoring. Disclosed is a method of calibrating a video system for monitoring objects on a flat area, including: scanning reference objects in the object space with each camera, measuring the position of points of the image of an object for each reference object on scanned frames, determining internal parameters of the cameras, correcting nonlinear distortions in the image on frames of the cameras by applying corresponding internal parameters of the cameras, determining a matrix for converting images obtained by the cameras into object space. For the measured points of the image of the reference object, the method includes determining an approximation line, and for determining internal parameters of the cameras, minimising the overall absolute deviation of the position of measured points of the image of the reference object from the approximation line, determining the mutual position of elements of the area by processing the image thereof. Further, the method comprises determining a matrix for converting coordinates on the images, obtained by the cameras, into the object space by comparing positions of at least four points associated with elements of the area, and corresponding points on images obtained by each camera, after correcting nonlinear distortions present thereon.

EFFECT: creating a simple method of calibrating video systems with fixed focal distance and varifocal video systems with reconfiguration without preliminary arrangement and measurement of the mutual arrangement of calibration marks.

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