Filters the frequency harmonics data produced by a Fourier Transform method using a range rectangle.
public class FrequencyFilterCommand
Public Class FrequencyFilterCommand
public ref class FrequencyFilterCommand
For more information, refer to Removing Noise.
Run the FrequencyFilterCommand on an image.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
public void FrequencyFilterCommandExample()
{
// 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, Leadtools.RasterSizeFlags.Bicubic);
sizecommand.Run(image);
FourierTransformInformation FTArray = new FourierTransformInformation(image);
// Apply FFT.
FastFourierTransformCommand command = new FastFourierTransformCommand(FTArray, 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.InsideY);
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:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Public Sub FrequencyFilterCommandExample()
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 sizecommand As SizeCommand = New SizeCommand(256, 256, RasterSizeFlags.Bicubic)
sizecommand.Run(leadImage)
Dim FTArray As FourierTransformInformation = New FourierTransformInformation(leadImage)
' Apply FFT.
Dim command As FastFourierTransformCommand = New FastFourierTransformCommand(FTArray,
FastFourierTransformCommandFlags.FastFourierTransform Or
FastFourierTransformCommandFlags.Gray)
command.Run(leadImage)
Dim rcRect As LeadRect = New LeadRect(0, 0, leadImage.Width \ 2, leadImage.Height \ 2)
Dim FreqCommand As FrequencyFilterCommand = New FrequencyFilterCommand(FTArray, rcRect,
FrequencyFilterCommandFlags.InsideX Or
FrequencyFilterCommandFlags.OutsideY)
Dim InvCommand As FastFourierTransformCommand = 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:\Users\Public\Documents\LEADTOOLS Images"
End Class
FrequencyFilterCommand Members
Leadtools.ImageProcessing.Core Namespace
FastFourierTransformCommand Class
DiscreteFourierTransformCommand Class
FourierTransformDisplayCommand Class
Leadtools.ImageProcessing.Effects.AverageCommand
Leadtools.ImageProcessing.Effects.AddNoiseCommand
Leadtools.ImageProcessing.Color.IntensityDetectCommand
Leadtools.ImageProcessing.Effects.SpatialFilterCommand
Leadtools.ImageProcessing.Effects.BinaryFilterCommand
Leadtools.ImageProcessing.Color.ChangeHueSaturationIntensityCommand
Leadtools.ImageProcessing.Color.ColorThresholdCommand
Leadtools.ImageProcessing.Effects.DirectionEdgeStatisticalCommand
FrequencyFilterCommand Class
Leadtools.ImageProcessing.Effects.StatisticsInformationCommand
Leadtools.ImageProcessing.Effects.FeretsDiameterCommand
Leadtools.ImageProcessing.Effects.ObjectInformationCommand
Leadtools.ImageProcessing.Effects.RegionContourPointsCommand
Leadtools.ImageProcessing.Color.MathematicalFunctionCommand
Leadtools.ImageProcessing.SpecialEffects.RevEffectCommand
Leadtools.ImageProcessing.Color.SegmentCommand
SubtractBackgroundCommand Class
Leadtools.ImageProcessing.Effects.UserFilterCommand
Leadtools.ImageProcessing.SpecialEffects.FragmentCommand
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