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Proceedings Paper

Optical plant sensor field-of-view determination
Author(s): Steven J. Merritt; George E. Meyer; C. Lesiak; Kenneth Von Bargen
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Paper Abstract

Optical plant sensors constructed from red and near-infrared (NIR) filtered photodetector pairs were used in conjunction with the normalized difference index (NDI) to detect plants. Plants must occupy a minimum of 8% of the photodetector pair field-of-view (FOV) to be detected. Thus, knowing the size and location of the FOV is crucial. Since the NDI requires red and NIR reflectance measurements from coincident areas, it is equally important to know the coincident area of a red-NIR detector pair and its location. Reflectance measurements taken every 1 cm from a 60 cm X 60 cm surface can be graphically viewed to determine the size and location of the FOV of a plant sensor. The surface has low reflectance and contains a 20 cm X 20 cm highly reflective checkerboard pattern in the center. From individual FOVs of red-NIR pairs, the coincident area can be found.

Paper Details

Date Published: 6 January 1995
PDF: 11 pages
Proc. SPIE 2345, Optics in Agriculture, Forestry, and Biological Processing, (6 January 1995); doi: 10.1117/12.198881
Show Author Affiliations
Steven J. Merritt, Univ. of Nebraska/Lincoln (United States)
George E. Meyer, Univ. of Nebraska/Lincoln (United States)
C. Lesiak, Univ. of Nebraska/Lincoln (United States)
Kenneth Von Bargen, Univ. of Nebraska/Lincoln (United States)


Published in SPIE Proceedings Vol. 2345:
Optics in Agriculture, Forestry, and Biological Processing
George E. Meyer; James A. DeShazer, Editor(s)

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