Sun illumination compensation value calculation method

A technology of illumination compensation and calculation method, applied in the field of image processing, can solve problems such as remote sensing image processing and application difficulties, and achieve the effect of easy engineering implementation, low computational complexity, and simple algorithm

Active Publication Date: 2020-07-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

In addition, because the earth itself is circular, even at the same time, the light intensity at different longitudes and latitudes is different, which leads to differences in the brightness of images taken by geostationary o

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  • Sun illumination compensation value calculation method

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Embodiment Construction

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] An embodiment of the present invention proposes a solar illumination compensation value method for an optical remote sensing image of a geostationary orbit satellite. Position elevation, calculate the solar declination angle, solar hour angle, solar altitude angle, solar radiation intensity, atmospheric optical quality, direct radiation atmospheric transparency coefficient, direct radiation intensity, scattered radiation atmospheric transparency coefficient, scattered radiation intensity, solar total The irradiance intensity can realize the calculation of the solar illumination compensation value for the optical remote sensing images of the geostationary orbit satellites taken at different dates, different times and different places. ...

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Abstract

The invention discloses a sun illumination compensation value calculation method. The method comprises the following steps: obtaining the size, geographic longitude interval, geographic latitude interval, shooting date, shooting moment and shooting position elevation of an optical remote sensing image of a geostationary orbit satellite; calculating the direct radiation intensity and the scatteredradiation intensity of the shooting position of the geostationary orbit satellite optical remote sensing image according to the remote sensing image size, the geographic longitude interval, the geographic latitude interval, the shooting date, the shooting moment and the shooting position elevation; calculating the total solar radiation intensity of the optical remote sensing image of the geostationary orbit satellite according to the direct radiation intensity and the scattered radiation intensity; aiming at the geostationary orbit satellite optical remote sensing images corresponding to different shooting dates, different shooting time and different shooting positions, calculating the difference value between the corresponding solar total irradiation intensities to obtain the solar illumination compensation value between the pixels of each geostationary orbit satellite optical remote sensing image. The method is low in calculation complexity, high in operation speed and easy for engineering realization.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method for calculating solar illumination compensation values. Background technique [0002] The orbital period of the geostationary optical remote sensing satellite is the same as the rotation period of the earth. It remains relatively stationary with the earth, and has a large imaging width. The advantages of good timeliness and so on. However, due to the Earth's rotation and orbit around the sun, the light intensity at the same location on Earth varies from day to day. In addition, because the earth itself is round, the light intensity of different longitudes and latitudes is different even at the same time, which leads to the brightness of the images taken by the geostationary optical remote sensing satellites on different dates, times and places. The difference is very large, which causes great difficulties in the subsequent processing and application of remote sensing im...

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Application Information

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IPC IPC(8): G01N21/17G06F30/20
CPCG01N21/17G01N2021/1765G01N2021/1793G01N2021/1795
Inventor 吕鹏胡玉新雷斌李倩倩侯仰拴
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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