Sunshine duration measuring method based on sky visible-light images

A measurement method and visible light technology, which is applied in the field of meteorological detection, can solve problems such as not being widely used, and achieve the effect of avoiding system measurement errors, avoiding sun tracking devices, and improving work efficiency

Active Publication Date: 2012-10-10
CHINESE ACAD OF METEOROLOGICAL SCI
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  • Sunshine duration measuring method based on sky visible-light images
  • Sunshine duration measuring method based on sky visible-light images
  • Sunshine duration measuring method based on sky visible-light images

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Embodiment Construction

[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] In the basic idea of ​​the present invention, the core is the fitting relationship between the number of the sun and its surrounding high-brightness pixels in the visible light image of the sky and the direct radiation intensity of the sun. Therefore, the image acquisition step, high-brightness pixel counting steps as well as fitting steps.

[0060] Image Acquisition Steps

[0061] The image acquisition step is to acquire a visible light image of the sky at a predetermined time by using an image acquisition device. The visible light image of the sky includes an image of a desired predetermined area. Usually, the image of the predetermined area refers to the image within a predetermined range around the sun and its surroundings.

[0062] In one embodiment, the image acquisition device can be a full-view sky visible light im...

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Abstract

The invention discloses a sunshine duration measuring method based on sky visible-light images. The sunshine duration measuring method includes acquiring a series of sky visible-light images by image acquisition equipment at preset intervals; searching high-brightness pixels in a preset area of each sky visible-light image and counting the quantity of the high-brightness pixels; judging whether sunshine is shot in each sky visible-light image or not; determining that the sunshine is shot in a certain sky visible-light image when the quantity of the high-brightness pixels of the sky visible-light image is larger than or equal to a high-brightness pixel quantity threshold, and determining that the sunshine is not shot in the certain sky visible-light image when the quantity of the high-brightness pixels of the sky visible-light image is smaller than the high-brightness pixel quantity threshold; and computing sunshine duration according to the time interval and the quantity of the sky visible-light images shot with the sunshine. The relevance among the sky visible-light images and the direct solar irradiation intensity is built by means of fitting analysis, and accordingly the novel method for detecting or measuring the direct solar irradiation intensity in an image processing and analyzing mode is provided. The method provides a novel selectable scheme for measuring the sunshine duration.

Description

technical field [0001] The invention relates to the field of meteorological detection, in particular to a method for measuring sunshine hours based on sky visible light images. Background technique [0002] Solar radiation is an important factor affecting atmospheric circulation and climate change. Direct solar radiation is an important part of total solar radiation. From the perspective of observation or measurement, direct solar radiation usually includes radiation perpendicular to the sun's surface (viewing angle of about 0.5°) and scattered radiation from a narrow ring-shaped sky around the sun (circumsolar scattering). The measurement of direct solar radiation intensity or irradiance is of great value in meteorological detection, solar energy utilization and other fields related to solar radiation, so direct solar radiation intensity is routine monitoring data of meteorological departments. [0003] At present, the direct measurement of the intensity of direct solar r...

Claims

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Application Information

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IPC IPC(8): G01W1/12
Inventor 杨俊吕伟涛马颖姚雯
Owner CHINESE ACAD OF METEOROLOGICAL SCI
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