Comparison of Crop-cover Measuring Systems

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Abstract
Two image processing methods, linear discrimination and textural difference, were evaluated using slides taken of 23 soils and 5 soil-surface cover treatments. Percent cover results from each image processing method are compared with those measured manually. Tests were purposely aimed at conditions that tend to be difficult to evaluate with machine vision because of limited visible contrast. These two image processing methods were found to provide reasonable cover estimates under conditions having bright green cover. Linear discrimination produced better estimates than did textural difference in situations with obvious color difference. Textural difference performed better when color difference was not apparent such as brown residue with a brown soil background.

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