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LineRemoveCommand Class
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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. Supported in Silverlight, Windows Phone 7

Object Model

LineRemoveCommand Class

Syntax

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

Example

Run the LineRemoveCommand on an image.

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

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

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

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

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

   }

   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;
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void LineRemoveCommandExample(RasterImage image, Stream outStream)
{
   // 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);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1);
   image.Dispose();
}

private void LineRemoveEvent_S1(object sender, LineRemoveCommandEventArgs e)
{
   Debug.WriteLine("Row Col "   + "( " + e.StartRow.ToString() + ", " + e.StartColumn + " )" +
      "\n Length " + e.Length.ToString());
   e.Status= RemoveStatus.Remove;
}
SilverlightVBCopy Code
Public Sub LineRemoveCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As LineRemoveCommand = New LineRemoveCommand()
   AddHandler command.LineRemove, AddressOf 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)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1)
   image.Dispose()
End Sub

Private Sub LineRemoveEvent_S1(ByVal sender As Object, ByVal e As LineRemoveCommandEventArgs)
   Debug.WriteLine("Row Col " & "( " & e.StartRow.ToString() & ", " & e.StartColumn & " )" & Constants.vbLf & " Length " & e.Length.ToString())
   e.Status= RemoveStatus.Remove
End Sub

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

See Also