Compass

MLModule

genre	Kernel
author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLKernel
definition	MLKernel.def
see also	ExtendedConvolution, Convolution, TextureFilter, Roberts, KernelExample, Sigma
keywords	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