New crop/weed/soil discrimination uses only one wavelength to reproduce the near-infrared signature

Federico Hahn

doi:10.1117/12.256083

4 November 1996 New crop/weed/soil discrimination uses only one wavelength to reproduce the near-infrared signature

Federico Hahn

Proceedings Volume 2818, Multispectral Imaging for Terrestrial Applications; (1996) https://doi.org/10.1117/12.256083
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Plant species discrimination by optical reflectance requires us to analyze reflectance spectral differences between two sampled broad band signatures making use of the discriminative integration index, DII. Crop/weed discrimination analyses of these indexes using a crop threshold introduces the discrimination efficiency of the entire vegetation population consisting of crop and weeds. Best discriminative efficiencies are spectral dependant and results for leek, cabbage, turnip and potato crops having competence with ten different weed species are presented. With the reflectance of an unique wavelength found iteratively, it was possible to reproduce the NIR spectrum of the crop or weed. This reflectance was multiplied by the crop reference spectrum, producing a pattern similar to the real crop signature and for the four crops tested the control wavelength corresponded to the one having the peak reflectance at the red region. This algorithm is the heart of a new model used to distinguish crops from weeds and the results achieved per group are presented.

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Federico Hahn "New crop/weed/soil discrimination uses only one wavelength to reproduce the near-infrared signature", Proc. SPIE 2818, Multispectral Imaging for Terrestrial Applications, (4 November 1996); https://doi.org/10.1117/12.256083

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KEYWORDS

Reflectivity

Infrared signatures

Near infrared

Tolerancing

Absorption

Adaptive optics

Chromium

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