PercentThresholdClassification Task

This task segments the an image into anomalous and non-anomalous regions. The threshold should be set low enough to minimize false positives without omitting real anomalies.

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)

; Run the anomaly detection task

AnomalyTask = ENVITask('RXAnomalyDetection')

AnomalyTask.INPUT_RASTER = Raster

AnomalyTask.Execute

; Get the collection of data objects currently available in the Data Manager

DataColl = e.Data

; Add the anomaly detection output to the Data Manager

DataColl.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(AnomalyTask.OUTPUT_RASTER)

; Get the thresholding task from the catalog of ENVITasks

PercentThresholdTask = ENVITask('PercentThresholdClassification')

; Define inputs

PercentThresholdTask.INPUT_RASTER = AnomalyTask.OUTPUT_RASTER

; Run the task

PercentThresholdTask.Execute

; Add the output to the Data Manager

DataColl.Add, PercentThresholdTask.OUTPUT_RASTER

; Display the result

Layer2 = View.CreateLayer(PercentThresholdTask.OUTPUT_RASTER)

; Flicker between the unthresholded anomaly detection image

; and the threshold image

Portal = View.CreatePortal()

Portal.Animate, 2.0, /FLICKER

Syntax

Result = ENVITask('PercentThresholdClassification')

Input properties (Set, Get): INPUT_RASTER, OUTPUT_RASTER_URI, THRESHOLD_PERCENT

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:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

INPUT_RASTER (required)

Specify a raster on which to segment the image into anomalous and non-anomalous regions.

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.

THRESHOLD_PERCENT (optional)

Specify the threshold percent to use. The default value is 0.050000000.

Version History

ENVI 5.2

Introduced

API Version

4.3