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  >  Docs Center  >  ENVI API  >  Processing  >  ENVILaplacianFilterTask

ENVILaplacianFilterTask

ENVILaplacianFilterTask

This task performs Laplacian filtering.

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)
 
; Process a spatial subset
Subset = ENVISubsetRaster(Raster, Sub_Rect=[600,200,799,399])
 
; Get the task from the catalog of ENVITasks
Task = ENVITask('LaplacianFilter')
 
; Define inputs
Task.INPUT_RASTER = Subset
Task.KERNEL_SIZE = [3,5]
 
; Define outputs
Task.OUTPUT_RASTER_URI = e.GetTemporaryFilename()
 
; Run the task
Task.Execute
 
; Get the collection of data objects currently available in the Data Manager
DataColl = e.Data
 
; Add the output to the Data Manager
DataColl.Add, Task.Output_Raster
 
; Display the result
View1 = e.GetView()
Layer1 = View1.CreateLayer(Task.Output_Raster)

Syntax


Result = ENVITask('LaplacianFilter')

Input properties (Set, Get): ADD_BACK, INPUT_RASTER, KERNEL_SIZE, OUTPUT_RASTER_URI

Output properties (Get only): OUTPUT_RASTER

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

Methods


This task inherits the following methods from ENVITask:

AddParameter

Execute

Parameter

ParameterNames

RemoveParameter

Properties


This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

COMMUTE_ON_SUBSET

DESCRIPTION

DISPLAY_NAME

NAME

REVISION

TAGS

This task also contains the following properties:

ADD_BACK (optional)

Specify a filter add-back percentage value between 0.0 and 1.0. A value of 1.0 is equal to 100%.

INPUT_RASTER (required)

Specify a raster on which to perform Laplacian filtering.

KERNEL_SIZE (optional)

Specify a two-element array [n,m] as the kernel size, where n is the number of columns and m is the number of rows. The default kernel size is [3,3].

OUTPUT_RASTER

This is a reference to the output raster of filetype ENVI.

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 property, or set it to an exclamation symbol (!), a temporary file will be created.

Version History


ENVI 5.3

Introduced

API Version


3.2

See Also


ENVITask, ENVITask::Parameter, ENVIDirectionalFilterTask, ENVIDirectionalKernelTask, ENVIGaussianLowPassKernelTask, ENVIGaussianLowPassFilterTask, ENVIHighPassFilterTask, ENVIHighPassKernelTask, ENVILaplacianKernelTask, ENVILowPassFilterTask, ENVILowPassKernelTask, ENVIMedianFilterTask, ENVIRasterConvolutionTask, ENVISobelFilterTask, ENVIRobertsFilterTask



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