Patent ID: 9342899
Filing Date: 2016-05-17
CPC Classification: G06K,G06T,H04N

Claim Text:
1. A method for measuring microphysical characteristics of precipitation particles using particle image velocimetry comprising following steps: a. a CCD camera is placed facing towards the light source, which forms a three-dimensional sampling space; b. auto-correlation images of precipitation particles illuminated by pulse light source are recorded by CCD camera; c. horizontal and vertical dimensions of particles are inferred from the images based on the scaling relation between the images and the size; d. shape, axis ratio, as well as orientation of particles are calculated by the image processing algorithm; e. vertical and horizontal velocities of particles are calculated according to the particle displacement in double-exposure image and interval time; f. phases of precipitation particles are classified according to the shape of particles, and the relationship between the velocity and size of particles; wherein the defocused and noisy images are restored using the median filtering and point spread function, the shape, size, axis ratio, orientation of particles are calculated based on grayscale and contour of images, and the fall velocity of particles are calculated from auto-correlation images using the particle grayscale tracking method.