BorderRemoveCommand Class

Summary

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

Syntax

Objective-C

C++

Java

public class BorderRemoveCommand : RasterCommand

Public Class BorderRemoveCommand  
   Inherits RasterCommand

@interface LTBorderRemoveCommand : LTRasterCommand

public class BorderRemoveCommand extends RasterCommand

public ref class BorderRemoveCommand : public RasterCommand

Remarks

This command removes borders that commonly appear in scanned text documents. Any or all of the four borders can be detected and removed. The behavior of this command can be modified by using an Event Handler that handles the BorderRemoveCommandEventArgs.
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.

Example

Run the BorderRemoveCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
 
public void BorderRemoveCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Clean.tif")); 
 
   // Prepare the command 
   BorderRemoveCommand command = new BorderRemoveCommand(); 
   command.BorderRemove += new EventHandler<BorderRemoveCommandEventArgs>(command_BorderRemove_S1); 
   command.Border = BorderRemoveBorderFlags.All; 
   command.Flags = BorderRemoveCommandFlags.UseVariance; 
   command.Percent = 20; 
   command.Variance = 3; 
   command.WhiteNoiseLength = 9; 
 
   command.Run(image); 
 
} 
 
private void command_BorderRemove_S1(object sender, BorderRemoveCommandEventArgs e) 
{ 
   string Border; 
 
   switch (e.Border) 
   { 
      case BorderRemoveBorderFlags.Top: 
         Border = "Top"; 
         break; 
      case BorderRemoveBorderFlags.Left: 
         Border = "Left"; 
         break; 
      case BorderRemoveBorderFlags.Right: 
         Border = "Right"; 
         break; 
      case BorderRemoveBorderFlags.Bottom: 
         Border = "Bottom"; 
         break; 
      default: 
         Border = ""; 
         break; 
   } 
   MessageBox.Show("Bounds " + "( " + e.BoundingRectangle.Left + ", " + e.BoundingRectangle.Top + ") - " + "( " + e.BoundingRectangle.Right + ", " + e.BoundingRectangle.Bottom + ")" + "\n Border " + Border.ToString()); 
   e.Status = RemoveStatus.Remove; 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
 
Public WithEvents borderRemoveCommandCallback As BorderRemoveCommand 
Public Sub BorderRemoveCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Clean.tif")) 
 
   ' Prepare the command 
   borderRemoveCommandCallback = New BorderRemoveCommand 
   borderRemoveCommandCallback.Border = BorderRemoveBorderFlags.All 
   borderRemoveCommandCallback.Flags = BorderRemoveCommandFlags.UseVariance 
   borderRemoveCommandCallback.Percent = 20 
   borderRemoveCommandCallback.Variance = 3 
   borderRemoveCommandCallback.WhiteNoiseLength = 9 
 
   borderRemoveCommandCallback.Run(leadImage) 
 
End Sub 
 
Private Sub BorderRemoveCommand_BorderRemove_S1(ByVal sender As Object, ByVal e As BorderRemoveCommandEventArgs) Handles borderRemoveCommandCallback.BorderRemove 
   Dim Border As String 
 
   Select Case (e.Border) 
      Case BorderRemoveBorderFlags.Top 
         Border = "Top" 
 
      Case BorderRemoveBorderFlags.Left 
         Border = "Left" 
 
      Case BorderRemoveBorderFlags.Right 
         Border = "Right" 
 
      Case BorderRemoveBorderFlags.Bottom 
         Border = "Bottom" 
 
      Case Else 
         Border = "" 
   End Select 
   MessageBox.Show("Bounds ( " + Convert.ToString(e.BoundingRectangle.Left) + ", " + 
                   Convert.ToString(e.BoundingRectangle.Top) + ") - " + "( " + 
                   Convert.ToString(e.BoundingRectangle.Right) + ", " + 
                   Convert.ToString(e.BoundingRectangle.Bottom) + ")" + Chr(13) + 
                   " Border " + Border.ToString()) 
   e.Status = RemoveStatus.Remove 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class