GrayscaleMorphologicalFilter Task

This task performs grayscale morphological filtering on an ENVIRaster.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('qb_boulder_msi', Subdir=['data'], $

  Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('GrayscaleMorphologicalFilter')

; Define inputs

Task.INPUT_RASTER = Raster

Task.METHOD = 'Erode'

; Run the task

Task.Execute

; Get the data collection

DataColl = e.Data

; Add the output to the data collection

DataColl.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(Task.OUTPUT_RASTER)

Syntax

Result = ENVITask('GrayscaleMorphologicalFilter')

Input parameters (Set, Get): INPUT_RASTER, ITERATIONS, KERNEL, METHOD, OUTPUT_RASTER_URI

Output parameters (Get only): OUTPUT_RASTER

Parameters marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Parameters marked as "Get" are those whose values you can retrieve but not set.

Input Parameters

INPUT_RASTER (required)

Specify a raster on which to perform morphological filtering.

ITERATIONS (optional)

Specify the number of iterations used to perform the morphological operation. The default value is 1.

KERNEL (required)

Specify a structuring element for the morphological process. Each finite element in the array is either subtracted from (in erosion) or added to (in dilation) the associated pixels. NaN or Infinite values imply pixels that are not included in the computation. If no KERNEL is specified, a 3 x 3 array will be used with a value of 0 for all of the array elements, indicating that all pixels will be used without addition or subtraction.

METHOD (required)

Specify a string indicating the filter method. The choices are:

Erode
Dilate
Open
Close

OUTPUT_RASTER_URI (optional)

Specify a string with the fully qualified filename and path of the associated OUTPUT_RASTER.

If you do not specify this parameter, or set it to an exclamation symbol (!), ENVI creates a temporary file.
If you set it to the hash symbol (#), ENVI creates a file in the temporary directory, but this file will not be deleted when ENVI closes.