VertexComponentAnalysis - Vertex Component Analysis¶

Given a set of mixed spectral vectors, estimatereference substances also known as endmembers using the VertexComponent Analysis algorithm.

Detailed description¶

Apply the Vertex Component Analysis [1] toan hyperspectral image to extract endmembers. Given a set of mixedspectral vectors (multispectral or hyperspectral), the applicationestimates the spectral signature of reference substances also knownas endmembers.

Parameters¶

This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is VertexComponentAnalysis .

[1]	Table: Parameters table for Vertex Component Analysis.

Parameter Key	Parameter Name	Parameter Type
in	Input Image	Input image
ne	Number of endmembers	Int
outendm	Output Endmembers	Output image
rand	set user defined seed	Int
inxml	Load otb application from xml file	XML input parameters file
outxml	Save otb application to xml file	XML output parameters file

Input Image: Input hyperspectral data cube.
Number of endmembers: The number of endmembers to extract from the hyperspectral image.
Output Endmembers: Endmembers, stored in aone-line multi-spectral image.Each pixel corresponds to oneendmembers and each band values corresponds to the spectralsignature of the corresponding endmember.
set user defined seed: Set specific seed. with integer value.
Load otb application from xml file: Load otb application from xml file.
Save otb application to xml file: Save otb application to xml file.

Example¶

To run this example in command-line, use the following:

otbcli_VertexComponentAnalysis -in cupriteSubHsi.tif -ne 5 -outendm VertexComponentAnalysis.tif double

To run this example from Python, use the following code snippet:

#!/usr/bin/python

# Import the otb applications package
import otbApplication

# The following line creates an instance of the VertexComponentAnalysis application
VertexComponentAnalysis = otbApplication.Registry.CreateApplication("VertexComponentAnalysis")

# The following lines set all the application parameters:
VertexComponentAnalysis.SetParameterString("in", "cupriteSubHsi.tif")

VertexComponentAnalysis.SetParameterInt("ne", 5)

VertexComponentAnalysis.SetParameterString("outendm", "VertexComponentAnalysis.tif")
VertexComponentAnalysis.SetParameterOutputImagePixelType("outendm", 7)

# The following line execute the application
VertexComponentAnalysis.ExecuteAndWriteOutput()

Limitations¶

None

Authors¶

This application has been written by OTB-Team.