Rainfall measurement method based on video images

A measurement method and video image technology, applied in the field of video image processing and machine vision, can solve the problems of insufficient real-time performance, low temporal and spatial resolution, noise interference, etc.
CN102707340AInactive Publication Date: 2012-10-03南京汇川图像视觉技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
南京汇川图像视觉技术有限公司
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a rainfall measurement method based on video images. For rainfall videos acquired by a video camera, the logarithmic image processing (LIP) method is adopted to replace the brightness value with gray tone and build gray tone constraint conditions to extract candidate raindrops; the principal component analysis (PCA) method is utilized to build a probability density distribution function of the inclination directions of the candidate raindrops, the Mean-shift method is adopted to derive and solve the peak value of the distribution function, and the inclination directions of the candidate raindrops are constrained to remove interference; defocusing raindrops are removed through constrain on the included angle between color vectors of both the scene background and the raindrop foreground; the size of each focusing raindrop is demarcated and calculated by parameters of a camera, a raindrop spectrum is built and the rainfall is derived by utilizing a Gamma raindrop spectrum distribution model in a fitting manner. According to the invention, a traditional rainfall measurement method is broken through, and the video-based measurement method is innovatively provided; rainfall data acquired by adopting the video-based measurement method has very high time resolution and spatial resolution; and economization and rapidness are realized.
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Description

technical field

[0001] The invention belongs to the fields of machine vision and video image processing, in particular to a method for measuring rainfall based on video images, which is mainly used in automatic meteorological measurement and is a method for measuring rainfall based on video images. Background technique

[0002] Precipitation data are generally obtained through rain gauges or weather radars. Optical Rain Gauge [1] Sensing the degree of attenuation of the laser beam passing through the rain to measure the amount of rainfall; microwave rain gauge [2] Measure the Doppler shift caused by raindrops, and use the relationship between the ultimate velocity of raindrops and the size of raindrops to estimate rainfall; there is also a commonly used tipping bucket rain gauge [3] , when the amount of water in the tipping bucket reaches a certain amount, the tipping bucket will dump and send a pulse signal to record the rainfall. weather radar [4] To measure rainfall, ...

Claims

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