i.zc
i.zc - Zero-crossing "edge detection" raster function for image processing.
Imagery (i.*)
ParameterRaster|input|Name of input raster map|False
ParameterNumber|width|x-y extent of the Gaussian filter|1|None|9
ParameterNumber|threshold|Sensitivity of Gaussian filter|0|None|10.0
ParameterNumber|orientations|Number of azimuth directions categorized|0|None|1
OutputRaster|output|Zero crossing raster map

