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:
This task also contains the following properties:
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
4.2