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