Module: Open_Close

Description:

Performs a morphological opening or closing, which is an erosion followed by a dilation, or vice-versa respectively.
The value N is a number of passes as in the Dilate_Erode module. It performs N erosions/dilations with one of the basic structuring elements (the 6-, 18-, or 26-adjacency relation), followed by N dilations/erosions with the same structuring element.

Typical application of the opening and closing operators, on salt and pepper noise. First: original image. Second: the opening, you can say, "flattens out" lower plains. Third: the closing "fills up" ditches.

Connections:

data

[required]
The input image, of type HxUniformScalarField3.

Ports:

Which

Specifies the opening or closing operator.

Connectivity

Choice of the adjacency relation.

Illustration of the different connectivities. (a): 6-, (b): 18-, and (c): 26-connectivity (in case you didn't figure it out, n-connectivity means n pixels in the neighbourhood).

Passes

Specifies the number of consecutive erosions/dilations.

Compute

Push the button to compute.

Commands:

Additional options can be accessed when typing in the console Open COMMAND_NAME. Typing the command again usually reverts back to original settings.

`verbose`

Displays timing information after the computation. Retype to hide info.

`create`

Runs the computation. Returns the name of the output, so it can be used in a script, such as set RESULT [Open create].