IBM Visualization Data Explorer User's Reference

Morph

Category

Transformation

Function

Applies a binary morphological operator to a field.

Syntax

output = Morph(input, operation, mask);

Inputs

Name	Type	Default	Description
input	field	none	input data
operation	string	"erode"	the operation to be applied
mask	value or string	"box"	the mask element

Outputs

Name	Type	Description
output	field	morphologically transformed input

Functional Details

This module applies one of the following binary morphological operators to input data:

"close"    "dilate"    "erode"    "open"

The mask parameter (see below) is centered on each position in input in turn, and all positions corresponding to "1" in the mask are considered for operation (see below).

input	is the input data to be operated on.
operation	specifies one of the following: "dilate": The output corresponding to a given data value is true (1) if any data value in input corresponding to a "1" in mask is true. Otherwise, the output is false. "erode": The output corresponding to a given data value is true (1) if all the data values corresponding to a "1" in mask are true. Otherwise, the output is false. "close": is dilation followed by erosion. "open" is erosion followed by dilation. Note: Successive openings or closings have no additional effect.
mask	specifies one of the following: a Filter name (see Filter) an explicit matrix. The function of both is to identify potential operands for operation (see above). The dimensions must be odd, and the default is the 3 × 3 box filter of Filter.

The module supports all data types and, like Filter, requires regular connections (quads or cubes). It handles both position- and connection-dependent data.

If the data are vectors, each element of a vector is transformed independently. Because the module returns a 0/1 output, its output is always TYPE_UBYTE.

Note: Data along the boundary are replicated to fill the overlap region for the filter.

Components

Modifies the "data" component. All other components are propagated to the output.

Example Visual Program

UsingMorph.net

See Also

 Compute,  Filter

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