DEVELOPMENT OF A SPECTRAL IMAGING SYSTEM BASED ON A LIQUID CRYSTAL TUNABLE FILTE
DEVELOPMENT OF A SPECTRAL IMAGING SYSTEM BASED ON A LIQUID CRYSTAL TUNABLE FILTE
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基于液晶可调谐滤波器的光谱成像系统的研制
DOI：
10.13031/2013.17324
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发表时间：
1998
影响因子：
1.5
通讯作者：
J. Grant
中科院分区：
文献类型：
--
作者：
M. Evans;C. Thai;J. Grant
本文提出了一种将液晶可调滤光片集成到单色视频中的方法
成像系统，并提供了一种在面对变化的情况下使系统响应跨波长均匀的方案
照度、滤镜透过率、相机镜头光圈设置和增益响应。这里开发的方案使用
滤镜衰减控制和摄像机增益控制，均可通过软件控制。这个系统是
应用于评价不同氮素处理(30-120ppm N)下菜豆植株的活力。
利用在695 nm和760 nm获取的植物图像，计算了
各植株冠层均表现出随施氮量增加而增加的趋势。
This article presents an approach to the integration of a liquid crystal tunable filter into a monochrome video
imaging system and provides a scheme for leveling the system response across wavelengths in the face of varying
illumination, filter transmittance, camera lens aperture settings, and gain response. The scheme developed here uses the
filter attenuation control and the camera gain control, both of which can be controlled via software. This system was
applied to the evaluation of vigor of bush bean plants grown under different nitrogen treatments (from 30 to 120 ppm N).
Using plant images captured at 695 nm and 760 nm, a Normalized Difference Vegetation Index (NDVI) was computed for
each plant canopy and showed a increasing trend with increasing nitrogen treatments.