Automatic thresholding for hemispherical canopy-photographs based on edge detection

Nobis M & Hunziker U
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Nobis, M., & Hunziker, U. (2005). Automatic thresholding for hemispherical canopy-photographs based on edge detection. Agricultural and Forest Meteorology, 128, 243-250. https://doi.org/10.1016/j.agrformet.2004.10.002