FastFourierTransformCommand Constructor()

Summary

Initializes a new FastFourierTransformCommand class object with default parameters.

Syntax

C++

Java

public FastFourierTransformCommand()

Public Function New()

public FastFourierTransformCommand()

public: 
FastFourierTransformCommand();

Example

Run the FastFourierTransformCommand on an image to apply a FFT transformation.

using Leadtools; 
using Leadtools.ImageProcessing; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void FastFourierTransformConstructorExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\FourierTransform.jpg")); 
 
   // Prepare the command 
   // Resize the image to make sure the image's dimensions are power of two. 
   SizeCommand sizeCommand = new SizeCommand(256, 256, RasterSizeFlags.Bicubic); 
   sizeCommand.Run(image); 
 
   FourierTransformInformation ftArray = new FourierTransformInformation(image); 
   Complex[] data = ftArray.Data; 
   int width = ftArray.Width; 
   int height = ftArray.Height; 
 
   // Apply FFT. 
   FastFourierTransformCommand command = new FastFourierTransformCommand(); 
   command.FourierTransformInformation = ftArray; 
   command.Flags = FastFourierTransformCommandFlags.FastFourierTransform | FastFourierTransformCommandFlags.Gray; 
   command.Run(image); 
 
   LeadRect rcRect = new LeadRect(0, 0, image.Width / 2, image.Height / 2); 
   FrequencyFilterCommand freqCommand = new FrequencyFilterCommand(ftArray, rcRect, FrequencyFilterCommandFlags.InsideX | FrequencyFilterCommandFlags.OutsideY); 
 
   FastFourierTransformCommand invCommand = new FastFourierTransformCommand(ftArray, FastFourierTransformCommandFlags.InverseFastFourierTransform | FastFourierTransformCommandFlags.Gray | FastFourierTransformCommandFlags.Scale | 
         FastFourierTransformCommandFlags.Both); 
   invCommand.Run(image); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.ImageProcessing 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub FastFourierTransformConstructorExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\\FourierTransform.jpg")) 
 
   ' Prepare the command 
   ' Resize the image to make sure the image's dimensions are power of two. 
   Dim sizeCmd As SizeCommand = New SizeCommand(256, 256, RasterSizeFlags.Bicubic) 
   sizeCmd.Run(leadImage) 
 
   Dim ftArray As FourierTransformInformation 
   ftArray = New FourierTransformInformation(leadImage) 
 
   Dim data() As Complex 
   data = ftArray.Data 
   Dim width As Integer = ftArray.Width 
   Dim height As Integer = ftArray.Height 
 
   ' Apply FFT. 
   Dim command As FastFourierTransformCommand 
   command = New FastFourierTransformCommand 
   command.FourierTransformInformation = ftArray 
   command.Flags = FastFourierTransformCommandFlags.FastFourierTransform Or FastFourierTransformCommandFlags.Gray 
   command.Run(leadImage) 
 
   Dim rcRect As LeadRect 
   rcRect = New LeadRect(0, 0, CType((leadImage.Width / 2), Integer), CType((leadImage.Height / 2), Integer)) 
   Dim freqCommand As FrequencyFilterCommand 
   freqCommand = New FrequencyFilterCommand(ftArray, rcRect, FrequencyFilterCommandFlags.InsideX Or FrequencyFilterCommandFlags.OutsideY) 
 
   Dim invCommand As FastFourierTransformCommand 
   invCommand = New FastFourierTransformCommand(ftArray, 
                                                FastFourierTransformCommandFlags.InverseFastFourierTransform Or 
                                                FastFourierTransformCommandFlags.Gray Or 
                                                FastFourierTransformCommandFlags.Scale Or 
                                                FastFourierTransformCommandFlags.Both) 
   invCommand.Run(leadImage) 
 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

FastFourierTransformCommand Class

FastFourierTransformCommand Members

Overload List

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Help Version 21.0.2021.7.2

Leadtools.ImageProcessing.Core Assembly

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Leadtools.ImageProcessing.Core Namespace

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