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LineRemoveCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Core Namespace : LineRemoveCommand Class



Removes horizontal and vertical lines in a 1-bit black and white image. This command is available in the Document/Medical Toolkits.

Syntax

Visual Basic (Declaration) 
Public Class LineRemoveCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As LineRemoveCommand
C# 
public class LineRemoveCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class LineRemoveCommand : public RasterCommand, IRasterCommand 

Example

Run the LineRemoveCommand on an image.

Visual BasicCopy Code
Public WithEvents lineRemoveCommand_S1 As LineRemoveCommand
Public Sub LineRemoveCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Clean.tif")

   ' Prepare the command
   lineRemoveCommand_S1 = New LineRemoveCommand
   lineRemoveCommand_S1.Type = LineRemoveCommandType.Horizontal
   lineRemoveCommand_S1.Flags = LineRemoveCommandFlags.UseGap
   lineRemoveCommand_S1.GapLength = 2
   lineRemoveCommand_S1.MaximumLineWidth = 5
   lineRemoveCommand_S1.MinimumLineLength = 200
   lineRemoveCommand_S1.MaximumWallPercent = 10
   lineRemoveCommand_S1.Wall = 7
   lineRemoveCommand_S1.Run(leadImage)

   RasterCodecs.Shutdown()
End Sub

Private Sub LineRemoveCommand_LineRemove_S1(ByVal sender As Object, ByVal e As LineRemoveCommandEventArgs) Handles lineRemoveCommand_S1.LineRemove
   MessageBox.Show("Row Col " + "( " + e.StartRow.ToString() + ", " + e.StartColumn.ToString() + " )" + _
                Chr(13) + " Length " + e.Length.ToString())
   e.Status = RemoveStatus.Remove
End Sub
C#Copy Code
public void LineRemoveCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Clean.tif"); 
 
   // Prepare the command 
   LineRemoveCommand command = new LineRemoveCommand(); 
   command.LineRemove       += new EventHandler<LineRemoveCommandEventArgs>(LineRemoveEvent_S1); 
   command.Type  = LineRemoveCommandType.Horizontal; 
   command.Flags = LineRemoveCommandFlags.UseGap; 
   command.GapLength = 2; 
   command.MaximumLineWidth = 5; 
   command.MinimumLineLength = 200; 
   command.MaximumWallPercent = 10; 
   command.Wall        = 7; 
   command.Run(image); 
 
   RasterCodecs.Shutdown(); 
} 
 
private void LineRemoveEvent_S1(object sender, LineRemoveCommandEventArgs e) 
{ 
   MessageBox.Show("Row Col "   + "( " + e.StartRow.ToString() + ", " + e.StartColumn + " )" + 
      "\n Length " + e.Length.ToString()); 
   e.Status= RemoveStatus.Remove; 
}

Remarks

  • This command removes horizontal and vertical lines from scanned text documents. If the lines pass through text, the LineRemoveCommand properties/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 LineRemoveCommandEventArgs.
  • 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.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.LineRemoveCommand

Requirements

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

See Also