Public Function New( _
   ByVal fourierTransformInformation As FourierTransformInformation, _
   ByVal range As Rectangle, _
   ByVal flags As DiscreteFourierTransformCommandFlags _
)

Visual Basic (Usage)	Copy Code
Dim fourierTransformInformation As FourierTransformInformation Dim range As Rectangle Dim flags As DiscreteFourierTransformCommandFlags   Dim instance As DiscreteFourierTransformCommand(fourierTransformInformation, range, flags)

public DiscreteFourierTransformCommand( 
   FourierTransformInformation fourierTransformInformation,
   Rectangle range,
   DiscreteFourierTransformCommandFlags flags
)

public:
DiscreteFourierTransformCommand( 
   FourierTransformInformation^ fourierTransformInformation,
   Rectangle range,
   DiscreteFourierTransformCommandFlags flags
)

Parameters

fourierTransformInformation

FourierTransformInformation structure. The Data property of the FourierTransformInformation object is a two-dimensional array that holds the frequency components of the image. Its size must be the same as the image. This array is filled by the command when DiscreteFourierTransformCommandFlags.DiscreteFourierTransform has been set, and it must be sent to the command to construct the image from it when DiscreteFourierTransformCommandFlags.InverseDiscreteFourierTransform has been set.

range

Specifies the frequency range to be computed when DiscreteFourierTransformCommandFlags.InverseDiscreteFourierTransform flag is set. It specifies the frequency range that will be used in the image construction when DiscreteFourierTransformCommandFlags.InverseDiscreteFourierTransform is set. The left value refers to the minimum X harmonic, the right refers to the maximum X harmonic, the top refers to the minimum Y harmonic and the bottom refers to the maximum Y harmonic. The maximum X harmonic equals (Width -1) and the maximum Y harmonic equals (Height -1). The minimum X harmonic equals 0 and the minimum Y harmonic equals 0.

flags

Flags that indicate the transformation type, operation channel, frequency data type used to reconstruct the image, the clipping type, the used or computed frequencies range, the operation on the specified X harmonics range, and the operation on the specified Y harmonics range. You can use a bitwise OR (|) to specify one flag from each group.

Run the DiscreteFourierTransformCommand on an image.

Visual Basic

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Public Sub DiscreteFourierTransformConstructorExample()    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    Dim FTArray As FourierTransformInformation    FTArray = New FourierTransformInformation(leadImage)    Dim rcRange As System.Drawing.Rectangle    rcRange = New System.Drawing.Rectangle(0, 0, CType((leadImage.Width / 4), Integer), CType((leadImage.Height / 2), Integer))    Dim command As DiscreteFourierTransformCommand    command = New DiscreteFourierTransformCommand(FTArray, rcRange, DiscreteFourierTransformCommandFlags.DiscreteFourierTransform Or DiscreteFourierTransformCommandFlags.Gray Or DiscreteFourierTransformCommandFlags.Range Or DiscreteFourierTransformCommandFlags.InsideX Or DiscreteFourierTransformCommandFlags.OutsideY)    ' Apply DFT.    command.Run(leadImage)    RasterCodecs.Shutdown() End Sub

C#

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public void DiscreteFourierTransformConstructorExample()  {     // 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     FourierTransformInformation FTArray = new FourierTransformInformation(image);     Rectangle rcRange = new Rectangle(0, 0, image.Width / 4, image.Height / 2);       DiscreteFourierTransformCommand command = new DiscreteFourierTransformCommand(FTArray, rcRange , DiscreteFourierTransformCommandFlags.DiscreteFourierTransform | DiscreteFourierTransformCommandFlags.Gray | DiscreteFourierTransformCommandFlags.Range | DiscreteFourierTransformCommandFlags.InsideX | DiscreteFourierTransformCommandFlags.OutsideY);     // Apply DFT.     command.Run(image);       RasterCodecs.Shutdown();  }

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

Reference