Night pure light extraction method

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

Active Publication Date: 2019-08-27
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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Embodiment Construction

[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 invention discloses a night pure light extraction method which solves the problem that in the prior art, the radiation brightness value of an artificial light area observed by a satellite is affected by the cloud clusters, moonlight and atmospheric aerosol. The method comprises the following steps of carrying out cloud removal processing on an acquired image; and extracting an image of which the lunar illumination score and the lunar zenith angle conform to a threshold standard from the image after cloud removal; extracting the pixel points corresponding to the pixels with the brightness greater than a third threshold value in the image; extracting the pixel points of which the number of pixels of which the brightness values are greater than a third threshold value is greater than a fourth threshold value; and sorting all pixels on the extracted pixel points according to the brightness, calculating the standard deviation of the part of pixels with the maximum brightness values according to the sorting of every three pixels, and taking the average value of the three values corresponding to the minimum standard deviation as the pure light value of the pixel points. According to the method, when the artificial light area is observed at night, the influence of the cloud cluster, moon light and atmospheric aerosol is removed, and the pure light information is obtained.

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 Applications(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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