Compass

MLModule

genre	Kernel
status	stable
author	Regina Ochotzki
package	MeVisLab/Standard
dll	MLKernel
definition	MLKernel.def
see also	ExtendedConvolution, LoG, Convolution, TextureFilter, Roberts, KernelExample, Sigma
keywords	Compass, Kirsch, Prewitt, filter, Robinson, edge, detection

Purpose

The module Compass applies four different compass filters to an input image performing edge detection.

Usually all directions will be calculated and only the maximum of all results will be written to the output image.

Alternatively, only one of eight directions can be chosen only.

Windows

Default Panel

Input Fields

input0

name: input0, type: Image

Output Fields

output0

name: output0, type: Image

Parameter Fields

Field Index

Border Handling: Enum

Direction (direction): Enum

Direction (directionInt): Integer

Fill Value: Double

referenceExtentMode: Enum

Use: Enum

Visible Fields

Border Handling

name: borderHandling, type: Enum, default: PadSrcClamp, deprecated name: edgeMode

Defines the border handling mode.

See Border Handling in Kernel Operations for details.

Values:

Title	Name
No Pad	NoPad
Pad Src Fill	PadSrcFill
Pad Dst Fill	PadDstFill
Pad Dst Fill With Orig	PadDstFillWithOrig
Pad Src Undefined	PadSrcUndefined
Pad Dst Undefined	PadDstUndefined
Pad Src Clamp	PadSrcClamp

Fill Value

name: fillValue, type: Double, default: 0

Sets the fill value for certain Border Handling modes.

Use

name: compassFilterSelect, type: Enum, default: Prewitt

Defines the used compass filter.

Values:

Title	Name
Prewitt	Prewitt
Kirsch	Kirsch
Robinson 3 Level	Robinson_3_Level
Robinson 5 Level	Robinson_5_Level

Direction (direction)

name: direction, type: Enum, default: East

Defines the direction of the edges to be detected.

Values:

Title	Name
East	East
North East	NorthEast
North	North
North West	NorthWest
West	West
South West	SouthWest
South	South
South East	SouthEast
All Directions	All Directions

Direction (directionInt)

name: directionInt, type: Integer, default: 0, minimum: 0, maximum: 8

Sets the direction in which edges are to be detected as an integer number.

Hidden Fields

referenceExtentMode

name: referenceExtentMode, type: Enum, default: Overlap

Values:

Title	Name
Overlap	Overlap
Input0 Ext Without Fill	Input0_ExtWithoutFill
Input0 Ext With Fill	Input0_ExtWithFill
Max Extents Without Fill	MaxExtentsWithoutFill
Max Extents With Fill	MaxExtentsWithFill