A method for extracting pure light at night

An extraction method and lighting technology, applied in the field of remote sensing, can solve problems such as the influence of radiance values

Active Publication Date: 2021-07-06
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0003] This application proposes a method for extracting pure light at night, which solves the problem that the radiance value of artificial light areas observed by satellites in the prior art is affected by clouds, moonlight and atmospheric aerosols

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  • A method for extracting pure light at night
  • A method for extracting pure light at night
  • A method for extracting pure light at night

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[0026] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0027] The technical solutions provided by various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0028] figure 1 Flowchart of the method for night-time pure light extraction.

[0029] The embodiment of the present application provides a method for extracting pure light at ni...

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Abstract

The present application discloses a method for extracting pure light at night, which solves the problem in the prior art that the radiance value of artificial light areas observed by satellites is affected by clouds, moonlight and atmospheric aerosols. The method includes the following steps: performing cloud removal processing on the collected images. Extract the images whose moonlight fraction and lunar zenith angle meet the threshold standard in the images after cloud removal. Extract the pixel points corresponding to the pixels whose brightness is greater than the third threshold in the image. Extracting pixel points in which the number of pixels whose luminance value is greater than the third threshold is greater than the fourth threshold. Sort all the pixels on the extracted pixel points according to the brightness, and calculate the standard deviation for every three pixels of the pixels with the largest brightness value, and take the average value of the three values ​​corresponding to the minimum standard deviation as the pixel The pure light value of the point. The method of this application observes artificial light areas at night, removes the influence of clouds, moonlight and atmospheric aerosols, and obtains pure light information.

Description

technical field [0001] This application relates to the field of remote sensing, in particular to a method for extracting pure light at night. Background technique [0002] In recent years, the development of satellite technology has made it possible to observe low-light images at night. VIIRS is a sensor mounted on the S-NPP satellite. Its unique DNB (Day / Night Band) has a wide band response range (0.5-0.9 μm), the sensitivity of the instrument and the radiation resolution are high, and it can be used for global low-light detection at night. However, due to the influence of clouds, moonlight and atmospheric aerosols, it is difficult to obtain pure light information, especially the influence of atmospheric aerosols . Observational radiance values ​​can be obtained from the VIIRS DBN data. These observed bright areas are light areas. Due to the presence of aerosols and clouds, the contrast between the light area and the nearby background value is reduced (that is, the contras...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/136G06K9/00
CPCG06T7/136G06T2207/10032G06T2207/30181G06V20/13
Inventor 杨富坤余超陈良富陶金花王子峰张莹范萌顾坚斌
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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