通过大气观察几何形状对视觉的影响

Pei-hsiu Suen, G. Healey, D. Slater
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引用次数: 6

摘要

通过短波红外(VNIR/SWIR)成像光谱仪,增大机载可见/近红外的离最低点视角,会导致大气向上透射率的降低和视线散射路径辐射的增加。这些效应结合起来降低了被测信号中不同材料之间的光谱对比度。我们分析了视角对237种材料在多种条件下的可分辨性的影响。材料可判别性使用统计算法量化,该算法采用子空间模型来表示材料随条件变化的光谱集。我们表明,在一系列条件下,即使在大的非最低点视角下,可靠的材料判别也是可能的。我们使用模拟森林高光谱图像说明了不同视角下材料识别的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The impact of viewing geometry on vision through the atmosphere
An increase in the off-nadir viewing angle for an airborne visible/near-infrared through short-wave infrared (VNIR/SWIR) imaging spectrometer leads to a decrease in upward atmospheric transmittance and an increase in line-of-sight scattered path radiance. These effects combine to reduce the spectral contrast between different materials in the sensed signal. We analyze the impact of viewing angle on material discriminability for 237 materials over a wide range of conditions. Material discriminability is quantified using a statistical algorithm that employs a subspace model to represent the set of spectra for a material as conditions vary. We show that reliable material discrimination is possible over a range of conditions even for large off-nadir viewing angles. We illustrate the performance of material identification over different viewing angles using simulated forest hyperspectral images.
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