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DiscreteFourierTransformCommand Constructor(FourierTransformInformation,LeadRect,DiscreteFourierTransformCommandFlags)
See Also  Example
Leadtools.ImageProcessing.Core Namespace > DiscreteFourierTransformCommand Class > DiscreteFourierTransformCommand Constructor : DiscreteFourierTransformCommand Constructor(FourierTransformInformation,LeadRect,DiscreteFourierTransformCommandFlags)



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.
Initializes a new DiscreteFourierTransformCommand class object with explicit parameters.

Syntax

Visual Basic (Declaration) 
Public Function New( _
   ByVal fourierTransformInformation As FourierTransformInformation, _
   ByVal range As LeadRect, _
   ByVal flags As DiscreteFourierTransformCommandFlags _
)
Visual Basic (Usage)Copy Code
Dim fourierTransformInformation As FourierTransformInformation
Dim range As LeadRect
Dim flags As DiscreteFourierTransformCommandFlags
 
Dim instance As New DiscreteFourierTransformCommand(fourierTransformInformation, range, flags)
C++/CLI 
public:
DiscreteFourierTransformCommand( 
   FourierTransformInformation^ fourierTransformInformation,
   LeadRect 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.

Example

Run the DiscreteFourierTransformCommand on an image.

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

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim FTArray As FourierTransformInformation
   FTArray = New FourierTransformInformation(leadImage)
   Dim rcRange As LeadRect
   rcRange = New LeadRect(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)

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void DiscreteFourierTransformConstructorExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // Prepare the command
      FourierTransformInformation FTArray = new FourierTransformInformation(image);
      LeadRect rcRange = new LeadRect(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);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
SilverlightVBCopy Code

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also