METHOD OF NON-CONTACT MEASUREMENT OF ANGULAR OBJECT ORIENTATION Russian patent published in 2018 - IPC G01B11/26 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement technology and can be used to determine an angular position of mobile objects in radar measurements. Method is proposed for a non-contact measurement of an object's angular orientation, in which the object is displaced by a video camera and then a video signal is transmitted via a communication channel to a computer. Moreover, a calibration step is introduced into the algorithm for obtaining calibration coefficients used to correct optical distortions in the lenses of a long-focus camera lens, two quadrocentric marks that are in the field of view of the video camera are placed on the longitudinal axis of the object and the video frames received on the computer are processed in order to correct the optical distortions imposed by the long-focus camera lens. Also, the coordinates of the centers of the quadrocentric marks on each video frame are determined on the basis of data on the previous positions of the centers of the quadrocentric marks by calculating the optical flow by the pyramidal Lucas-Canada algorithm and refinement of the obtained coordinates with a sub-pixel accuracy by the Shi-Tomazi angle search algorithm and the positions and directions of the angular orientation vector of the object are calculated based on the position and orientation data of the video camera and the location of the centers of quadrocentric marks on each frame.

EFFECT: obtaining an angular position of an object, suspended at altitude of 30 meters with accuracy of 8 arc minutes.

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