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.

Inactive Publication Date: 2012-10-03
南京汇川图像视觉技术有限公司
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Problems solved by technology

[0016] The problems to be solved by the present invention are: the time and space resolution of the existing rainfall measurement method is low, the existing raindrop detection method is susceptible to noise interference, and the real-time performance is insufficient, and the existing focusing and defocusing raindrop distinction method has relatively large errors

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  • Rainfall measurement method based on video images
  • Rainfall measurement method based on video images

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Embodiment Construction

[0085] The invention constructs the raindrop spectrum RSD through the method of video processing, and then utilizes the Gamma distribution model commonly used in meteorology to fit and deduce the rainfall. In addition, in order to accurately estimate the rainfall, it is necessary to distinguish focused and defocused raindrops. The present invention derives a criterion for distinguishing focused and defocused raindrops based on optical principles.

[0086] The flow of the rainfall measurement algorithm of the present invention is as follows: figure 1 shown, where F n-1 , F n , F n+1 For three consecutive frames of brightness images, the detailed implementation is as follows:

[0087] 1. Use three consecutive frames of images to detect raindrops in the current frame. The pixel brightness after being occluded by raindrops is often higher than the original background luminance, and the raindrops fall faster, so the same pixel position is rarely occluded by raindrops at the same ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/14
Inventor 董蓉李勃陈启美江登表廖娟阮雅端宋林川史德飞吴炜
Owner 南京汇川图像视觉技术有限公司
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