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Digital-camera-based method for measuring atmospheric visibility and Angstrom index

A technology of atmospheric visibility and digital camera, which is applied in the measurement field of atmospheric visibility and Angstrom index, can solve the problems of large estimation error and difficult promotion of cost, and achieve the effect of small measurement error, low cost and high cost problem

Inactive Publication Date: 2018-01-09
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

The earliest and oldest method is through the observer's identification of a dark object on the horizon of the sky, but this estimation error is large
Nowadays, most of the visibility is obtained through the measurement of physical quantities and then converted into visibility. However, due to the high cost of this instrument, it is difficult to be popularized. There is an urgent need for low-cost visibility measurement methods.

Method used

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  • Digital-camera-based method for measuring atmospheric visibility and Angstrom index

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Embodiment Construction

[0022] The present invention is described in further detail now in conjunction with accompanying drawing.

[0023] Such as figure 1 The shown method for measuring atmospheric visibility and Angstrom index based on a digital camera specifically includes the following steps.

[0024] 1. Get pictures

[0025] Utilize a computer and an ordinary digital camera, plus a zoom lens as a tool for taking pictures. In addition, the terrain requirements for shooting are: at least two dark matter and background, such as trees and sky. The open-source software installed on the computer triggers the camera to collect pictures periodically, in which the picture requires a resolution of 3888×2592 pixels and is stored in the computer in JPEG format.

[0026] 2. Process pictures

[0027] Mainly process through Matlab to obtain the characteristic parameters required by the next algorithm: (1) use the software area segmentation function to segment the background from the picture, mainly use the...

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Abstract

The invention relates to a digital-camera-based method for measuring atmospheric visibility and an Angstrom index. A measuring device is formed by a common digital camera controlled by a computer; thecomputer calculates atmospheric visibility by obvious contrast between dark matters and a background in a shot photo based on the Lambert-Beer's law to calculate; and with two different methods, thevisibility is measured on normal and low-visibility conditions. Besides, extinction coefficients of different wavelengths are measured by using three kinds of color channels of the camera and an Angstrom index as an important parameter in atmospheric aerosol classification is obtained, wherein the Angstrom index is a most basic parameter representing the atmospheric optical property and is used for calculating the atmospheric aerosol content. Therefore, a problem of high cost of the visibility measuring instrument is solved; and the measuring method has the advantage of low cost.

Description

technical field [0001] The invention belongs to the technical field of atmospheric visibility measurement based on image processing, in particular to a method for measuring atmospheric visibility and Angstrom index based on a digital camera. Background technique [0002] Atmospheric visibility is a very important meteorological parameter, and its measurement method has many applications. For example, it is a very critical parameter for traffic, especially road and aviation. It is also of great value for the analysis of air pollution levels. In addition, it is also very important for the tourism industry, because visibility is the basic condition for the opening of scenic spots. [0003] It is well known that the visibility of the atmosphere is related to the extinction coefficient of the particles, which is a measure of the amount of scattering and absorption by suspended particles in the atmosphere. The relationship between this measure of visibility and the extinction c...

Claims

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Application Information

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IPC IPC(8): G06T7/11G06T7/194G06T7/12G01N21/17
Inventor 夏景明李冲周刚
Owner NANJING UNIV OF INFORMATION SCI & TECH
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