Erosion / Dilatation

 

In this mode you can apply some mathematical morphology operators on the TAG images.

 

Some 2D versions of these operations (erosion, dilatation...) could already be found in other modes (Morpho and Edit), but I tought it would be practical to make them also available independently and also in 3D.

 

These operations can be applied on all the selected images in 2D using a 2D kernel, or in 3D on the selected 3D groups using a 3D kernel.

 

You can also specify the reach of the operations.  An erosion operation with a reach of "3" is equivalent to doing 3 erosion operation with a reach of 1.  But an open operation with a reach of "3" is not the same as 3 open operations with a reach of "1".

 

An example of application would be: If you segmented the liver with the AI 3D, and want to compute statistics on the voxels of this liver, you may want to do a 3D erosion of a few pixels to discard voxels on the border of the organ.  This will ensure that all counted voxels are entirely inside the liver.

 

Technical Note:

 

For more information on the Mathematical Morphology operators (erosion, dilatation, opening, closing), please refer to the article: A New Set of Fast Algorithms for Mathematical Morphology I and II, Andre Bleau, Jacques De Guise, and A.-Robert LeBlanc. CVGIP: Image Understanding, Vol. 56, No. 2, September 1992, pp. 178-229.

 

 

 

 

Original Image

Reach = 1

Reach = 2

Reach = 3

Erosion 2D

Dilatation 2D

Open 2D

Close 2D

 

 

 

From the Graphic Interface

 

 

 

2D / 3D

The operations can act on the selected images individually with a 2D kernel, or on the selected 3D groups with a 3D kernel.

 

Operator reach

Specify the reach (in pixels) of the operations.

 

Erosion

Shrink the TAG image in all directions.

 

Dilatation

Expand the TAG image in all directions.

 

Open

This operation is useful for reducing noise in the image. Any small region whose radius is smaller than "reach" will be erased

 

Close

This operation is useful for eliminating small holes in the image. Any regions whose radius is smaller than "reach" will be filled.

 

 

From the Display Area

          

There is no display area interaction specific to this mode.

 

 

From the Keyboard

 

There is no keyboard interface specific to this mode.

 

 

From the Command Line

 

There are no command lines specific to this mode.