Palm-sized and tough two-dimensional spectroscopic imager: the so-called hyperspectral camera for visible and mid-infrared light.  Proposal of plant-species identification regardless of zenith and azimuth angles based on only two types of basic spectroscopic data (near-surface and internal reflectance)

Hanyue Kang; Natsumi Kawashima; Sora Mizutani; Tomoya Kitazaki; Satoru Adachi; Jyunya Iwaki; Kotone Yokoyama; Ichiro Ishimaru

doi:10.1117/12.2525950

21 June 2019 Palm-sized and tough two-dimensional spectroscopic imager: the so-called hyperspectral camera for visible and mid-infrared light. Proposal of plant-species identification regardless of zenith and azimuth angles based on only two types of basic spectroscopic data (near-surface and internal reflectance)

Hanyue Kang, Natsumi Kawashima, Sora Mizutani, Tomoya Kitazaki, Satoru Adachi, Jyunya Iwaki, Kotone Yokoyama, Ichiro Ishimaru

Author Affiliations +

Proceedings Volume 11059, Multimodal Sensing: Technologies and Applications; 110590K (2019) https://doi.org/10.1117/12.2525950
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

High-frequency spectroscopic observation methods using small satellites and drones for monitoring of plankton in the ocean and vegetation activity have recently attracted considerable attention. However, in multi-directional spectroscopic imaging, the spectroscopic characteristics vary depending on the observation and illumination angles. Therefore, huge quantities of spectroscopic data were previously required for every conceivable combination of zenith and azimuth angles to identify plant species. The method proposed here can identify any plant species from near-surface and internal reflectance spectroscopic data, regardless of the zenith and azimuth angles. We assume that the observed spectral intensity can be calculated as a linear sum of the near-surface spectral reflectivity and the internal diffusion spectral reflectivity multiplied by the light-source spectral intensity and the reflection correction coefficients a and b. We acquire the near-surface and internal reflected light as basic spectroscopic data using the orthogonal polarized light illumination method. The coefficients a and b can be calculated from basic spectroscopic data. We obtain m-sets (a_i, b_i) (i =1-m) using combinations of the numbers of λ1…λn. If the reflection correction coefficient of the m-sets (a_i, b_i) is close to one, we identify the observed plant as a plant species contained in the basic data. If the two species are different, the m-sets (a_i, b_i) have uncorrelated values and the m-sets (a_i, b_i) reflection correction coefficient decreases towards zero. In this work, we performed feasibility demonstrations using two types of plant and successfully determined from the basic data that the observed plant is the correct plant species.

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Hanyue Kang, Natsumi Kawashima, Sora Mizutani, Tomoya Kitazaki, Satoru Adachi, Jyunya Iwaki, Kotone Yokoyama, and Ichiro Ishimaru "Palm-sized and tough two-dimensional spectroscopic imager: the so-called hyperspectral camera for visible and mid-infrared light. Proposal of plant-species identification regardless of zenith and azimuth angles based on only two types of basic spectroscopic data (near-surface and internal reflectance)", Proc. SPIE 11059, Multimodal Sensing: Technologies and Applications, 110590K (21 June 2019); https://doi.org/10.1117/12.2525950

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KEYWORDS

Spectroscopy

Reflectivity

Imaging spectroscopy

Reflection

Reflectance spectroscopy

Visible radiation

Imaging systems

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