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Early Growth Stage Corn Plant Population Measurement Using Neural Network Approach
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 8-14 in Proceedings of the World Congress of Computers in Agriculture and Natural Resources (13-15, March 2002, Iguacu Falls, Brazil) 701P0301.
Authors: D.S. Shrestha and B.L. Steward
Keywords: Plant population, machine vision, neural network, segmentation
A major cause of corn yield variation within a field is plant population variation. An early plant population sensing system has potential as a tool for evaluating spatially varying emergence patterns and planter performance. Machine vision technology for automatically sensing early growth stage corn plant density and spacing was devel-oped in this research. Correspondence between sequential field images taken from a digital video camera was determined using pattern matching of intensity images. A color segmentation algorithm was used to separate plants from background. A neural network (NN) approach was used to correlate the green region in RGB color space to different lighting conditions. Plants were singulated based on plant object shapes. The NN approach was effective in adjusting the segmentation decision surface based on general measures of lighting changes.