An Airborne Area Array Staring Hyperspectral Image Illumination Correction Method

Abstract

The invention relates to an airborne area array staring type hyperspectral image illumination correction method, including 1) using an ASD and a cosine probe to observe the downlink irradiance at the imaging moment of an airborne area array staring type hyperspectral imager to obtain the downlink irradiance 2) Calculate the minimum distance between each spectral curve to be detected and the downward irradiance spectral curve at the previous moment, that is, the illuminance difference; if the illuminance difference is greater than the preset threshold, mark the corresponding spectral curve to be detected The time is the time to be corrected; 3) Carry out radiometric calibration on the original airborne area array staring hyperspectral image to obtain the apparent radiance L(μ v ); 4) through time matching, locate the wave band that needs to be corrected; integrate the downlink irradiance spectrum curve at the moment to be corrected equivalently to this wave band, and calculate the correction coefficient of this wave band; 5) use the correction coefficient to correct the wave band Apparent radiance L(μ v ) for correction to obtain the corrected band; 6) merge the corrected band with the uncorrected band to obtain the corrected image.

Description

technical field [0001] The invention relates to the field of hyperspectral data pre-correction in quantitative remote sensing, in particular to an airborne area array staring type hyperspectral image illumination correction method. Background technique [0002] The imaging methods of hyperspectral imagers can generally be divided into three types: swing-broom, push-broom, and staring. Among them, the area-array staring hyperspectral imager can achieve three-dimensional imaging in a single exposure without mechanical movement and is subject to Platform stability is less affected. During the staring imaging of the area-array staring hyperspectral imager, the influence of solar illumination and atmospheric spatiotemporal changes cannot be ignored. The staring imaging process takes several seconds to complete multiple exposures in different bands to obtain the final hyperspectral data cube. During this period, because the airborne remote sensing platform is located below the cl...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the data preprocessing method existing in the prior art ignores the change of illumination in the time period of airborne remote sensing acquisition, and the remote sensing image collected by default has better illumination consistency, which brings great harm to the quality of hyperspectral data. solves the problem of large uncertainty, and provides an airborne area array staring hyperspectral image illumination correction method

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