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FourierTransformDisplayCommand Constructor(FourierTransformInformation,FourierTransformDisplayCommandFlags)

Summary

Initializes a new FourierTransformDisplayCommand class object with explicit parameters.

Syntax

C#
VB
Objective-C
WinRT C#
C++
- (instancetype)initWithInformation:(null_unspecified LTFourierTransformInformation *)information 
                              flags:(LTFourierTransformDisplayCommandFlags)flags 
             
function FourierTransformDisplayCommand(  
   fourierTransformInformation , 
   flags  
) 

Parameters

fourierTransformInformation
FourierTransformInformation structure. The Data property of the FourierTransformInformation object is a two-dimensional array that will hold the frequency components of the image. Its dimensions must be the same as the image dimensions.

flags
Flags that indicate the data to be shown and the plotting scale. You can use a bit-wise OR ( ¦ ) to specify one flag from each group.

Example

Runs the FourierTransformDisplayCommand on an image, applies the Discrete Fourier Transform command to it, and displays the data.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void FourierTransformDisplayConstructorExample() 
{ 
   // 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 
   FourierTransformInformation ftArray = new FourierTransformInformation(image); 
   LeadRect rcRange = new LeadRect(0, 0, image.Width - 1, image.Height - 1); 
   DiscreteFourierTransformCommand dftCommand = new DiscreteFourierTransformCommand(); 
 
   dftCommand.FourierTransformInformation = ftArray; 
   dftCommand.Range = rcRange; 
   dftCommand.Flags = DiscreteFourierTransformCommandFlags.DiscreteFourierTransform | 
      DiscreteFourierTransformCommandFlags.Gray | 
      DiscreteFourierTransformCommandFlags.Range | 
      DiscreteFourierTransformCommandFlags.InsideX | 
      DiscreteFourierTransformCommandFlags.InsideY; 
   // apply DFT 
   dftCommand.Run(image); 
 
   FourierTransformDisplayCommand command = new FourierTransformDisplayCommand(ftArray, FourierTransformDisplayCommandFlags.Log | FourierTransformDisplayCommandFlags.Magnitude); 
   //plot frequency magnitude. 
   command.Run(image); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
      Leadtools.Examples.Support.SetLicense() 
 
Public Sub FourierTransformDisplayConstructorExample() 
   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 
   Dim ftArray As FourierTransformInformation 
   ftArray = New FourierTransformInformation(leadImage) 
   Dim rcRange As LeadRect 
   rcRange = New LeadRect(0, 0, leadImage.Width - 1, leadImage.Height - 1) 
   Dim dftCommand As DiscreteFourierTransformCommand 
   dftCommand = New DiscreteFourierTransformCommand 
   dftCommand.FourierTransformInformation = ftArray 
   dftCommand.Range = rcRange 
   dftCommand.Flags = DiscreteFourierTransformCommandFlags.DiscreteFourierTransform Or 
      DiscreteFourierTransformCommandFlags.Gray Or 
      DiscreteFourierTransformCommandFlags.Range Or 
      DiscreteFourierTransformCommandFlags.InsideX Or 
      DiscreteFourierTransformCommandFlags.InsideY 
   ' apply DFT 
   dftCommand.Run(leadImage) 
 
   Dim command As FourierTransformDisplayCommand 
   command = New FourierTransformDisplayCommand(ftArray, FourierTransformDisplayCommandFlags.Log Or FourierTransformDisplayCommandFlags.Magnitude) 
   'plot frequency magnitude. 
   command.Run(leadImage) 
 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.ImageProcessing.Core Assembly