METHOD OF CALIBRATING AN OPTICAL MEASURING DEVICE Russian patent published in 2020 - IPC G06T7/80 G01P5/20 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a method of calibrating an optical measuring device. Method of calibration involves additional steps: b) rectification of each image (I₁, I₂, I₃) of camera relative to one common reference plane in measuring volume (V) using a pre-calibrated display function for each of them, c) performing a two-dimensional correlation for at least one pair of rectified images (Ir₁, Ir₂, Ir₃) of cameras in order to create a corresponding number of correlation fields (C₁₂), wherein each correlation field (C₁₂) shows an elongated band of correlation maxima band, d) for each correlation field (C₁₂): d1) reducing the correlation maxima band to a representative line (g₁₂), d2) determination of the distance (d₁₂) from that representative line (g₁₂) to the origin of the correlation coordinate field (C₁₂) as a correction value, e) correcting display functions of those cameras (K1, K2, K3), in which rectified images (Ir₁, Ir₂, Ir₃) of cameras have been included in correlation at stage c, using certain correction values.

EFFECT: technical result consists in providing calibration method for high densities of particles in three-dimensional measuring volumes.

8 cl, 2 dwg