SAGA 9.4.2 | Tool Library Documentation

Wombling (Edge Detection)


Description

Continuous Wombling for edge detection. Uses magnitude of gradient to detect edges between adjacent cells. Edge segments connect such edges, when the difference of their gradient directions is below given threshold.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputFeaturegrid, inputFEATURE--
OutputEdge Pointsshapes, output, optionalEDGE_POINTS--
Edge Segmentsshapes, output, optionalEDGE_LINES--
Gradientsgrid list, output, optionalGRADIENTS--
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Minimum Magnitudefloating point numberTMAGNITUDEMinimum magnitude as percentile.Minimum: 0.000000 Maximum: 100.000000 Default: 90.000000
Maximum Anglefloating point numberTDIRECTIONMaximum angular difference as degree between adjacent segment points.Minimum: 0.000000 Maximum: 180.000000 Default: 30.000000
Minimum Neighboursinteger numberTNEIGHBOURMinimum number of neighbouring potential edge cells with similar direction.Minimum: 0 Default: 1
AlignmentchoiceALIGNMENT-Available Choices: [0] between cells [1] on cell Default: 1
Edge ConnectivitychoiceNEIGHBOUR-Available Choices: [0] Rooke's case [1] Queen's case Default: 1
Output of GradientsbooleanGRADIENTS_OUT-Default: 0

Command Line


Usage: saga_cmd grid_filter 16 [-TMAGNITUDE ] [-TDIRECTION ] [-TNEIGHBOUR ] [-ALIGNMENT ] [-NEIGHBOUR ] [-FEATURE ] [-EDGE_POINTS ] [-EDGE_LINES ] [-GRADIENTS_OUT ] [-GRADIENTS ]
  -TMAGNITUDE:	Minimum Magnitude
	floating point number
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 90.000000
  -TDIRECTION:	Maximum Angle
	floating point number
	Minimum: 0.000000
	Maximum: 180.000000
	Default: 30.000000
  -TNEIGHBOUR:   	Minimum Neighbours
	integer number
	Minimum: 0
	Default: 1
  -ALIGNMENT:    	Alignment
	choice
	Available Choices:
	[0] between cells
	[1] on cell
	Default: 1
  -NEIGHBOUR:    	Edge Connectivity
	choice
	Available Choices:
	[0] Rooke's case
	[1] Queen's case
	Default: 1
  -FEATURE:      	Feature
	grid, input
  -EDGE_POINTS:  	Edge Points
	shapes, output, optional
  -EDGE_LINES:   	Edge Segments
	shapes, output, optional
  -GRADIENTS_OUT:	Output of Gradients
	boolean
	Default: 0
  -GRADIENTS:    	Gradients
	grid list, output, optional