LEADTOOLS Image Processing (Leadtools.ImageProcessing.Core assembly)
LEAD Technologies, Inc

FourierTransformInformation Class






Members 
The FourierTransformInformation class contains information about the complex 2D array that will hold the frequency components of the image. .NET support WinRT support
Object Model
FourierTransformInformation ClassComplex Structure
Syntax
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: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

FourierTransformInformation Members
Leadtools.ImageProcessing.Core Namespace
Removing Noise
DiscreteFourierTransformCommand Class
FrequencyFilterCommand Class
Leadtools.ImageProcessing.Effects.AverageCommand
MedianCommand Class
Leadtools.ImageProcessing.Effects.AddNoiseCommand
Leadtools.ImageProcessing.Color.IntensityDetectCommand
Leadtools.ImageProcessing.Effects.SpatialFilterCommand
Leadtools.ImageProcessing.Effects.BinaryFilterCommand
MaximumCommand Class
MinimumCommand Class
Leadtools.ImageProcessing.Color.ChangeHueSaturationIntensityCommand
Leadtools.ImageProcessing.Color.ColorThresholdCommand
Leadtools.ImageProcessing.Effects.DirectionEdgeStatisticalCommand
FastFourierTransformCommand Class
FourierTransformDisplayCommand Class
Leadtools.ImageProcessing.Effects.StatisticsInformationCommand
Leadtools.ImageProcessing.Effects.FeretsDiameterCommand
Leadtools.ImageProcessing.Effects.ObjectInformationCommand
Leadtools.ImageProcessing.Effects.RegionContourPointsCommand
Leadtools.ImageProcessing.Color.MathematicalFunctionCommand
Leadtools.ImageProcessing.SpecialEffects.RevEffectCommand
Leadtools.ImageProcessing.Color.SegmentCommand
SubtractBackgroundCommand Class
Leadtools.ImageProcessing.Effects.UserFilterCommand
Leadtools.ImageProcessing.SpecialEffects.FragmentCommand
Leadtools.ImageProcessing.Effects.HighPassCommand
Leadtools.ImageProcessing.Effects.UnsharpMaskCommand

 

 


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