Image Correction and In Situ Spectral Calibration for Low-Cost, Smartphone Hyperspectral Imaging
Image Correction and In Situ Spectral Calibration for Low-Cost, Smartphone Hyperspectral Imaging
复制标题
DOI：
10.3390/rs14051152
复制
发表时间：
2022-03-01
期刊：
影响因子：
5
通讯作者：
Willmott, Jon R.
中科院分区：
文献类型：
--
作者：
Davies, Matthew;Stuart, Mary B.;Willmott, Jon R.
低成本高光谱成像仪器便携性的发展转化为农业和环境监测应用的重大利益。这些进步可以通过消除对复杂的后处理和校准的需要来进一步解释。我们提出了一种方法，大大提高便携式高光谱成像的效用。由“操作员抖动”引入图像的垂直和水平空间失真通过具有两个空间参考的场景内参考卡来校正。进行了与光源无关的原位光谱校准。这是通过将场景中红-绿-蓝目标的地面真实光谱反射率与高光谱数据的未校准输出进行比较来实现的。最后，由于照明的非平坦光谱输出而引入到高光谱图像中的偏差被去除。这使得真正的手持式低成本高光谱成像仪的低技能操作，用于农业，环境监测或其他可见光高光谱成像应用。
Developments in the portability of low-cost hyperspectral imaging instruments translate to significant benefits to agricultural industries and environmental monitoring applications. These advances can be further explicated by removing the need for complex post-processing and calibration. We propose a method for substantially increasing the utility of portable hyperspectral imaging. Vertical and horizontal spatial distortions introduced into images by 'operator shake' are corrected by an in-scene reference card with two spatial references. In situ light-source-independent spectral calibration is performed. This is achieved by a comparison of the ground-truth spectral reflectance of an in-scene red-green-blue target to the uncalibrated output of the hyperspectral data. Finally, bias introduced into the hyperspectral images due to the non-flat spectral output of the illumination is removed. This allows for low-skilled operation of a truly handheld, low-cost hyperspectral imager for agriculture, environmental monitoring, or other visible hyperspectral imaging applications.