METHOD FOR MEASURING MOVEMENT SPEED OF EXTENDED OBJECTS Russian patent published in 2021 - IPC G01P3/36 

FIELD: non-contact meters of motion parameters.

SUBSTANCE: invention relates to non-contact meters of motion parameters of extended objects. The claimed method of measuring the speed of movement of an extended object is based on projecting its image on the screen of the radiation receiver and converting the image elements into electrical signals. On the current frame, a rectangular area is selected, for which a histogram is calculated, which is obtained by summing the brightness levels of the pixels of each column with a width of one pixel. In addition, a preliminary stage is introduced, in which the most informative rectangular area is selected from several areas of the image on the current frame. For each rectangular area, a histogram of brightness levels is calculated and the variance of the histogram is determined. In the current frame, the area of the image with the highest variance of the brightness level histogram is used for subsequent analysis.. On the next frame, a strip is selected, the upper and lower borders of which correspond to the selected rectangular area of the current frame with the same coordinates of the upper and lower borders. A histogram is also calculated for the selected strip. Next, an array of similar areas is formed, for which the histogram of the rectangular area of the current frame is compared with the histograms of similar rectangular areas that are equivalent in size to the selected rectangular area. The offset of the image of an extended object during the frame sequence period is used to calculate the speed.

EFFECT: increase in the accuracy of measuring the movement speed of an extended object in the presence of external interference (rain, hail, snow, snowstorm) and a reduced information content of the analyzed area of the image of an extended object due to the image monotony.

1 cl, 31 dwg