<< Chapter < Page
  Digital signal processing - dsp     Page 1 / 21
Chapter >> Page >
Examine the code for a Java class that can be used to perform forward and inverse 2D Fourier transforms on 3D surfaces in the space domain. Learn how the 2D Fourier transform behaves for a variety of different sample surfaces in the space domain.

Revised: Wed Oct 21 16:16:44 CDT 2015

This page is included in the following book: Digital Signal Processing - DSP

Table of contents

Preface

This is the second module in a two-part series. The first part published earlier was titled Java1490-2D Fourier Transforms using Java, Part 1 . In this module, I will teach you how to perform two-dimensional (2D) Fourier transforms using Java. Iwill

  • Explain the conceptual and computational aspects of 2D Fourier transforms
  • Explain the relationship between the space domain and the wavenumber domain
  • Provide sufficient background information that you will be able to appreciate the importance of the 2D Fourier transform
  • Provide Java software to perform 2D Fourier transforms
  • Provide Java software to test and exercise that capability

Two separate programs

I will present and explain two separate programs. One program consists of a single class named ImgMod30 . The purpose of this class is to satisfy the computational requirements for forward and inverse 2D Fouriertransforms. This class also provides a method for rearranging the spectral data into a more useful format for plotting. The second program named ImgMod31 will be used to test the 2D Fourier transform class, and also to illustrate the use of 2D Fourier transforms for some well known samplesurfaces.

A third class named ImgMod29 will be used to display various 3D surfaces resulting from the application of the 2D Fourier transform. Iexplained this class in an earlier module titled Plotting 3D Surfaces using Java .

Using the class named ImgMod30

The 2D Fourier transform class couldn't be easier to use. To perform a forward transform execute a statement similar to the following:

ImgMod30.xform2D(spatialData,realSpect, imagSpect,amplitudeSpect);

The first parameter in the above statement is a reference to an array object containing the data to be transformed. The other three parameters refer to arrayobjects that will be populated with the results of the transform.

To perform an inverse transform execute a statement similar to the following:

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Digital signal processing - dsp. OpenStax CNX. Jan 06, 2016 Download for free at https://legacy.cnx.org/content/col11642/1.38
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Digital signal processing - dsp' conversation and receive update notifications?

Ask