FourierTransformInformation Class

The FourierTransformInformation class contains information about the complex 2D array that will hold the frequency components of the image.

Object Model

Syntax

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public class FourierTransformInformation : System.IDisposable

'Declaration
 
Public Class FourierTransformInformation 
   Implements System.IDisposable

'Usage
 
Dim instance As FourierTransformInformation

public sealed class FourierTransformInformation : IClosable //In WinRT the IDisposable interface is replaced by IClosable

function Leadtools.ImageProcessing.Core.FourierTransformInformation()

public ref class FourierTransformInformation : public System.IDisposable

Remarks

The Fourier Transform commands return an instance of FourierTransformInformation. This object holds all the frequency domain information (harmonics information). Each Data element holds the information about the harmonic frequency at its location. This information is an instance of the Complex structure, which contains the real and imaginary values of the harmonic.

To obtain the magnitude, take the square root of the sum of the squared real and imaginary values.

To calculate the phase, find the arctan of (imaginary/real).

To get/set the value of a harmonic at a specific location, use the GetDataOf / SetData methods. (0,0) is the first element.

The frequency harmonics are sorted as follows:


            LowX LowY---------HighXLowY----------LowXLowY
            |                     |                  |
            |                     |                  |
            |                     |                  |
            |                     |                  |
            |                     |                  |
            |                     |                  |
            LowXHighY---------HighXHighY---------LowXHighY
            |                     |                  |
            |                     |                  |
            |                     |                  |
            |                     |                  |
            |                     |                  |
            LowXLowY----------HighXLowY----------LowXLowY

This structure is used only by the Fourier Transform methods:

This command does not support 32-bit grayscale images.

Example

Refer to FastFourierTransformCommand .

Requirements

Target Platforms

Reference