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Proceedings Paper

Vision methods for inspection of greenhouse poinsettia plants
Author(s): George E. Meyer; W. W. Troyer; Jay B. Fitzgerald
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Paper Abstract

Various vision methods for inspecting the growth and quality of poinsettia plants are discussed in this paper . The visible and near-infrared vision approaches are based on previous spectral reflectance measurements . Low (0 ppm) nitrogen plants grown in a greenhouse showed an increase in red (0. 7 - 0. 75 rim) and a decrease in near-infrared ( 0 . 8 - 1 . 1 im) reflectance over high ( 256 ppm) nitrogen levels . Growth chamber plants showed similar reflectance in the red but different NIR reflectance than with greenhouse plants . NIR reflectance was affected by vegetative density and not by leaf nitrogen content. Thermal imaging techniques (12 - 14 im) improve canopy temperature measurements . The usefulness of image methods depends on reflectivity analog-digital sensitivity and background lighting quality. An electronic plant doctor based on a database of images would be a useful tool for the grower to perform visual diagnostics. 1.

Paper Details

Date Published: 1 February 1991
PDF: 7 pages
Proc. SPIE 1379, Optics in Agriculture, (1 February 1991); doi: 10.1117/12.25079
Show Author Affiliations
George E. Meyer, Univ. of Nebraska/Lincoln (United States)
W. W. Troyer, Univ. of Nebraska/Lincoln (United States)
Jay B. Fitzgerald, Univ. of Nebraska/Lincoln (United States)

Published in SPIE Proceedings Vol. 1379:
Optics in Agriculture
James A. DeShazer; George E. Meyer, Editor(s)

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