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FourierTransformInformation Class
Summary
The FourierTransformInformation class contains information about the complex 2D array that will hold the frequency components of the image.
Syntax
public class FourierTransformInformation : System.IDisposablePublic Class FourierTransformInformationImplements System.IDisposable
public sealed class FourierTransformInformation : IClosable@interface LTFourierTransformInformation : NSObjectpublic class FourierTransformInformationfunction Leadtools.ImageProcessing.Core.FourierTransformInformation()public ref class FourierTransformInformation : public System.IDisposableRemarks
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:
- DiscreteFourierTransformCommand
- FastFourierTransformCommand
- FourierTransformDisplayCommand
- FrequencyFilterCommand
- FrequencyFilterMaskCommand
This command does not support 32-bit grayscale images.
Example
Refer to FastFourierTransformCommand .
Requirements
See Also
Reference
FourierTransformInformation Members
Leadtools.ImageProcessing.Core Namespace
DiscreteFourierTransformCommand Class
FastFourierTransformCommandFlags Enumeration
Leadtools.ImageProcessing.Effects.AverageCommand
Leadtools.ImageProcessing.Effects.AddNoiseCommand
Leadtools.ImageProcessing.Color.IntensityDetectCommand
Leadtools.ImageProcessing.Effects.SpatialFilterCommand
Leadtools.ImageProcessing.Effects.BinaryFilterCommand
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
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© 1991-2017 LEAD Technologies, Inc. All Rights Reserved.
