Method and device for video-based rainfall monitoring

Abstract

The present invention discloses a method and a device for video-based rainfall monitoring, and relates to the field of hydrological monitoring. The method includes the following steps: inspecting a rainfall measurement location, configuring rainfall measurement infrastructure, and collecting rainfall videos to gather basic parameters and depth-of-field information; separating backgrounds and raindrops frame by frame from the rainfall videos and performing noise reduction, thereby obtaining a frame-by-frame binary raindrop pattern image; performing morphological analysis on the frame-by-frame binary raindrop pattern image, and calculating a distance from each raindrop to a camera based on a lens equation; filtering out raindrops beyond the depth of field using the distance of each raindrop to the camera, calculating an actual diameter of the raindrops within the depth of field, and fitting a raindrop size distribution function; and calculating a rainfall amount using the raindrop size distribution function. The present invention can adapt to various scene changes, has high calculation efficiency, can monitor rainfall in real-time, and provides high spatiotemporal resolution.