ComputeModulusAndPhase - Compute Modulus And Phase¶

This application computes the modulus and the phase of a complex SAR image.

Detailed description¶

This application computes the modulus and the phase of a complex SAR image. The input should be a single band image with complex pixels.

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 ComputeModulusAndPhase .

[1]	Table: Parameters table for Compute Modulus And Phase.

Parameter Key	Parameter Name	Parameter Type
in	Input Image	Input image
modulus	Modulus	Output image
phase	Phase	Output image
ram	Available RAM (Mb)	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 image (complex single band).
Modulus: Modulus of the input image computes with the following formula: $\sqrt{real\*real + imag\*imag}$ where real and imag are respectively the real and the imaginary part of the input complex image. .
Phase: Phase of the input image computes with the following formula: $\tan^{-1}(\frac{imag}{real})$ where real and imag are respectively the real and the imaginary part of the input complex image.
Available RAM (Mb): Available memory for processing (in MB).
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_ComputeModulusAndPhase -in monobandComplexFloat.tif -modulus modulus.tif -phase phase.tif

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 ComputeModulusAndPhase application
ComputeModulusAndPhase = otbApplication.Registry.CreateApplication("ComputeModulusAndPhase")

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

ComputeModulusAndPhase.SetParameterString("modulus", "modulus.tif")

ComputeModulusAndPhase.SetParameterString("phase", "phase.tif")

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

Limitations¶

The application takes as input single band image with complex pixels.

Authors¶

This application has been written by Alexia Mondot (alexia.mondot@c-s.fr) and Mickael Savinaud (mickael.savinaud@c-s.fr).