ForwardMNFTransform Task

This task performs a minimum noise fraction (MNF) transform to determine the inherent dimensionality of image data, to segregate noise in the data, and to reduce the computational requirements for subsequent processing.

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('ForwardMNFTransform')

; Define inputs

Task.INPUT_RASTER = Raster

; Run the task

Task.Execute

; Add the output to the Data Manager

e.Data.Add, Task.OUTPUT_RASTER

Syntax

Result = ENVITask('ForwardMNFTransform')

Input parameters (Set, Get): DIFF_SUBRECT, INPUT_NOISE_FILE, INPUT_RASTER, OUT_NBANDS, OUTPUT_NOISE_FILE, OUTPUT_RASTER_URI, OUTPUT_STATS_FILE

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

DIFF_SUBRECT (optional)

Specify a four-element array expressing the spatial subset on which to calculate shift difference. This is then used to determine noise statistics that are applied to the entire image. The array is of the form: [columnMin, rowMin, columnMax, rowMax].

INPUT_NOISE_FILE (optional)

Specify an input .sta file from previous a Forward MNF to use in this MNF transform.

INPUT_RASTER (required)

Specify a raster on which to perform a MNF transform.

OUT_NBANDS (optional)

Provide the desired number of output bands. If left blank, all bands will be used.

OUTPUT_NOISE_FILE (optional)

Specify a string with a fully qualified filename and path of the associated OUTPUT_NOISE_FILE. This file is then used on future Forward MNF Transforms to correlate data. If you do not specify this parameter, or set it to an exclamation symbol (!), a temporary file will be created.

OUTPUT_STATS_FILE (optional)

Specify a string with a fully qualified filename and path of the associated OUTPUT_STATS_FILE. This file is then used on future Inverse MNF Transforms. If you do not specify this parameter, or set it to an exclamation symbol (!), a temporary file will be created.

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.