Agriculture Reference
In-Depth Information
Fig. 4.6
(
a
) Image-acquisition concept using tower-based multispectral camera. (
b
) Field plots
distribution and tower location at the energy farm, University of Illinois at Urbana-Champaign campus
camera was available in two spectral confi gurations: RGB for high-quality color
imaging and color-infrared for multispectral applications. The camera had three
CCD channels with center wavelengths of 500, 650, and 800 nm, respectively, and
bandwidth of approximately 100 nm for each. A serial interface provided external
control of gain and exposure time for each independent channel via a standard RS
232 port. The gain settings controlled the amount of the output signal amplifi cation
for each individual channel in the camera. The gain of the camera ranged from
0 to 36 dB corresponding to 95-1,023 in 16-bit digital number representation,
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