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FastFourierTransformCommand Constructor()
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Leadtools.ImageProcessing.Core Namespace > FastFourierTransformCommand Class > FastFourierTransformCommand Constructor : FastFourierTransformCommand Constructor()



Initializes a new FastFourierTransformCommand class object with default parameters.

Syntax

Visual Basic (Declaration) 
Public Function New()
Visual Basic (Usage)Copy Code
Dim instance As FastFourierTransformCommand()
C# 
public FastFourierTransformCommand()
C++/CLI 
public:
FastFourierTransformCommand();

Example

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

Visual BasicCopy Code
Public Sub FastFourierTransformConstructorExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.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 Rectangle
   rcRect = New Rectangle(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)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void FastFourierTransformConstructorExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.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); 
 
   Rectangle rcRect = new Rectangle(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); 
 
   RasterCodecs.Shutdown(); 
}

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also