Abstract
ABSTRACT Amicrocomputer-based image processing procedure was developed for evaluating the percent canopy cover of crops from overhead slide photographs. The procedure was designed to be non-destructive and use the entire image for calculating canopy cover. Statistical comparisons are provided between a visual inspection method, the computer procedure, and leaf area measurements with a leaf area meter. In comparison to leaf area measurements, the computer procedure produced acceptable canopy cover estimates, while the visual inspection procedure estimates were larger than the leaf area measurement results. Under actual field situations, the computer-based procedure also worked well, however, the computer method could process only 43 of the 50 slides in the sample. Although human error was reduced by the computer procedure, time requirements for processing were increased. The cost of the image processing system is a limiting factor for wide use of the technique unless the computer and camera system have additional applications.
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