| 摘要 |
An agricultural implement (a spray device) differentiates living plants (G(s), CP, PS) growing in a field from background materials (DL, AI, AT GV, DM, C) by detecting a change in slope of a reflectance characteristic (d[log{ref%}]/d[nm]) of objects in a field of view. By using a change in slope of the reflectance characteristic, a small percentage of living plant material in the field of view can be detected and the agricultural implement need not be calibrated to a particular background material. In some embodiments, if the change in slope is determined to exceed a predetermined threshold amount, then it is determined that a weed likely exists in the field of view and a solenoid-operated spray valve is opened at the appropriate time to spray the entire area (including the weed) that was in the field of view with herbicide.
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