A method and system for measuring rainfall based on an all-sky imager

Abstract

The invention discloses a rainfall measurement method and system based on an all-sky imager. The method includes: acquiring real-time cloud image video data collected by an all-sky imager; converting cloud image video data in a current preset time period into multiple single frames Image data, and convert each single-frame image data into a grayscale image; subtract two adjacent grayscale images to obtain multiple difference images; if the change of each difference image within the current preset time period If the value is greater than the preset threshold, the pixel area of ​​the raindrop is determined according to the difference images in the current preset time period, and the pixel area of ​​the raindrop is the area occupied by the raindrop in the image; according to the pixel area of ​​the raindrop and the relationship between the pixel area of ​​the raindrop and the volume of the preset raindrop , to determine the rainfall for the current preset time period. The invention collects real-time cloud image video data through an all-sky imager, converts the cloud image video data into a grayscale image, determines the rainfall in the current preset time period, and improves the accuracy of light rain and drizzle measurement.

Description

technical field [0001] The invention relates to the technical field of video data processing, in particular to a rainfall measurement method and system based on an all-sky imager. Background technique [0002] Rainfall information is usually obtained by ground rain gauges, ground radar estimation, and satellite remote sensing inversion. Tipping bucket rain gauge for measurement. Its working principle is: rainwater enters the water receiver from the uppermost water receiving port, falls into the water receiving funnel, and flows into the tipping bucket through the funnel mouth. When the accumulated water reaches a certain height (such as 0.01 mm), the tipping bucket loses its balance and overturns. And every time the bucket is dumped, the switch is turned on, and a pulse signal is sent to the collector, and the collector records the rainfall, so that the rainfall process can be measured. However, when there is light rain or drizzle, since the amount of rain falling into the...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a rainfall measurement method and system based on an all-sky imager, which solves the problem that the precise measurement of rainfall in light rain or drizzle cannot be realized in the prior art

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