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A Low-Rate Video Approach to Hyperspectral Imaging of Dynamic Scenes

机译:低速视频方法对动态场景的高光谱成像

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The increased sensitivity of modern hyperspectral line-scanning systems has led to the development of imaging systems that can acquire each line of hyperspectral pixels at very high data rates (in the 200–400 Hz range). These data acquisition rates present an opportunity to acquire full hyperspectral scenes at rapid rates, enabling the use of traditional push-broom imaging systems as low-rate video hyperspectral imaging systems. This paper provides an overview of the design of an integrated system that produces low-rate video hyperspectral image sequences by merging a hyperspectral line scanner, operating in the visible and near infra-red, with a high-speed pan-tilt system and an integrated IMU-GPS that provides system pointing. The integrated unit is operated from atop a telescopic mast, which also allows imaging of the same surface area or objects from multiple view zenith directions, useful for bi-directional reflectance data acquisition and analysis. The telescopic mast platform also enables stereo hyperspectral image acquisition, and therefore, the ability to construct a digital elevation model of the surface. Imaging near the shoreline in a coastal setting, we provide an example of hyperspectral imagery time series acquired during a field experiment in July 2017 with our integrated system, which produced hyperspectral image sequences with 371 spectral bands, spatial dimensions of 1600 × 212, and 16 bits per pixel, every 0.67 s. A second example times series acquired during a rooftop experiment conducted on the Rochester Institute of Technology campus in August 2017 illustrates a second application, moving vehicle imaging, with 371 spectral bands, 16 bit dynamic range, and 1600 × 300 spatial dimensions every second.
机译:现代高光谱线扫描系统灵敏度的提高导致成像系统的发展,该系统可以以非常高的数据速率(在200–400 Hz范围内)采集高光谱像素的每一行。这些数据采集速率为以快速速率采集完整的高光谱场景提供了机会,从而使传统的推扫式扫帚成像系统可以用作低速率视频高光谱成像系统。本文提供了一个集成系统的设计概述,该系统通过将在可见光和近红外下运行的高光谱线扫描仪与高速云台系统和集成的高光谱线扫描仪合并,来生成低速率视频高光谱图像序列提供系统指向的I​​MU-GPS。集成单元从伸缩式桅杆顶部操作,它还允许从多个视图天顶方向成像相同的表面积或物体,这对于双向反射率数据采集和分析很有用。伸缩式桅杆平台还可以实现立体高光谱图像采集,因此可以构建表面的数字高程模型。我们在沿海环境中对海岸线附近的影像进行了成像,我们提供了一个使用我们的集成系统在2017年7月的野外实验期间获得的高光谱影像时间序列的示例,该系统产生了具有371个光谱带,1600×212和16的空间尺寸的高光谱影像序列每0.67 s每像素像素位数。 2017年8月在罗彻斯特理工大学校园进行的屋顶实验中获得的第二个示例时间序列说明了第二种应用,即移动车辆成像,具有371个光谱带,16位动态范围和每秒1600×300的空间尺寸。

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