Color indices for weed identification under various soil, residue, and lighting conditions

D. M. Woebbecke, G. E. Meyer, K. Von Bargen, D. A. Mortensen

Research output: Contribution to journalArticlepeer-review

1107 Scopus citations


Color slide images of weeds among various soils and residues were digitized and analyzed for red, green, and blue (RGB) color content. Red, green, and blue chromatic coordinates (rgb) of plants were very different from those of background soils and residue. To distinguish living plant material from a nonplant background, several indices of chromatic coordinates were studied, tested, and were successful in identifying weeds. The indices included r-g, g-b, (g-b)||r-g|, and 2g-r-b. A modified hue was also used to distinguish weeds from non-plant surfaces. The modified hue, 2g-r-b index, and the green chromatic coordinate distinguished weeds from a nonplant background (0.05 level of significance) better than other indices. However, the modified hue was the most computationally intense. These indices worked well for both nonshaded and shaded sunlit conditions. These indices could be used for sensor design for detecting weeds for spot spraying control.

Original languageEnglish (US)
Pages (from-to)259-269
Number of pages11
JournalTransactions of the American Society of Agricultural Engineers
Issue number1
StatePublished - Jan 1995

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)


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