CRISM高光谱图像的光谱微笑校正

2009 First Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing Pub Date : 2009-10-16 DOI:10.1109/WHISPERS.2009.5288992

X. Ceamanos, S. Douté

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引用次数: 8

摘要

紧凑型火星侦察成像光谱仪(CRISM)受到推扫式传感器常见的一种现象的影响:“光谱微笑”。因此，中心波长和光谱分辨率都依赖于跨轨道位置，从而产生水平空间调制。采用两步校正方法对CRISM光谱微笑进行校正。首先，数据被重新采样到所谓的“最佳点”波长。其次，通过模拟光谱锐化提高分辨率，克服了检测元件的光谱响应宽度不均匀的问题。实验结果表明，微笑能量的减少效果显著。

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Spectral smile correction in CRISM hyperspectral images

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is affected by an artifact common to pushbroom sensors: “spectral smile”. As a consequence, both central wavelength and spectral resolution become dependent on the across-track position thus giving rise to a horizontal spatial modulation. The correction of CRISM spectral smile is addressed using a two-step correction. First, data is re-sampled to the so-called “sweet spot” wavelengths. Secondly, the non-uniform spectral response width of the detection elements is overcome by mimicking an increase of resolution thanks to a spectral sharpening. Experiments show remarkable results regarding the decrease of smile energy.

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2009 First Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing

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