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RakeRemoveCommand Class

Summary

Removes isolated Data Rakes in 1-bit black and white images.

Remarks
  • Removes data entry rakes from scanned text documents. If the lines pass through text, the RakeRemoveCommand properties and Constructor parameters can be configured to remove or preserve the text. The behavior of this command can be further modified by using an Event Handler that handles the RakeRemoveCommandEventArgs.
  • This command works only on 1-bit black and white images.
  • If a region is selected, only the selected region will be changed by this command. If no region is selected, the whole image will be processed.
  • This command does not support signed data images.
  • This command does not support 32-bit grayscale images.

For more information, refer to Cleaning Up 1-Bit Images.

Example

Runs the RakeRemoveCommand on an image.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void RakeRemoveCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"Forms\Forms to be Recognized\OCR\FCC-107_OCR_Filled.tif")); 
 
   // Prepare the command 
   RakeRemoveCommand command = new RakeRemoveCommand(); 
   command.RakeRemove += new EventHandler<RakeRemoveCommandEventArgs>(RakeRemoveEvent_S1); 
   command.MinLength = 50; 
   command.MinWallHeight = 10; 
   command.MaxWidth = 3; 
   command.MaxWallPercent = 25; 
   command.MaxSideteethLength = 60; 
   command.MaxMidteethLength = 50; 
   command.Gaps = 1; 
   command.Variance = 1; 
   command.TeethSpacing = 5; 
   command.AutoFilter = false; 
 
   command.Run(image); 
 
} 
 
private void RakeRemoveEvent_S1(object sender, RakeRemoveCommandEventArgs e) 
{ 
   MessageBox.Show("Rake length is " + "( " + e.Length.ToString() + " )"); 
   e.Status = RemoveStatus.Remove; 
} 
 
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 WithEvents rakeRemoveCommand_S1 As RakeRemoveCommand 
Public Sub RakeRemoveCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Forms\\Forms to be Recognized\\OCR\\FCC-107_OCR_Filled.tif")) 
 
   ' Prepare the command 
   rakeRemoveCommand_S1 = New RakeRemoveCommand 
 
   rakeRemoveCommand_S1.MinLength = 50 
   rakeRemoveCommand_S1.MinWallHeight = 10 
   rakeRemoveCommand_S1.MaxWidth = 3 
   rakeRemoveCommand_S1.MaxWallPercent = 25 
   rakeRemoveCommand_S1.MaxSideteethLength = 60 
   rakeRemoveCommand_S1.MaxMidteethLength = 50 
   rakeRemoveCommand_S1.Gaps = 1 
   rakeRemoveCommand_S1.Variance = 1 
   rakeRemoveCommand_S1.TeethSpacing = 5 
   rakeRemoveCommand_S1.AutoFilter = False 
   rakeRemoveCommand_S1.Run(leadImage) 
 
 
End Sub 
 
Private Sub RakeRemoveCommand_RakeRemove_S1(ByVal sender As Object, ByVal e As RakeRemoveCommandEventArgs) Handles rakeRemoveCommand_S1.RakeRemove 
   MessageBox.Show("Rake length is " + "( " + e.Length.ToString() + " )") 
   e.Status = RemoveStatus.Remove 
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