LineRemoveCommand Class

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

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class LineRemoveCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class LineRemoveCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As LineRemoveCommand

public sealed class LineRemoveCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Core.LineRemoveCommand()

public ref class LineRemoveCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

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

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";
}

function LineRemoveCommandExample() {
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\clean.tif";
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      // Prepare the command
      with (Leadtools.ImageProcessing.Core) {
         var command = new LineRemoveCommand();
         command.addEventListener("lineremove", 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);
      }
   });
}

function LineRemoveEvent_S1(e) {
   console.error("Row Col " + "( " + e.startRow.toString() + ", " + e.startColumn + " )" +
      "\n Length " + e.length.toString());
   e.status = Leadtools.ImageProcessing.Core.RemoveStatus.remove;
}

[TestMethod]
public async Task LineRemoveCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Clean.tif";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Prepare the command
   LineRemoveCommand command = new LineRemoveCommand();
   command.LineRemove       += new EventHandler<LineRemoveCommandEventArgs>(LineRemoveEvent_S1);
   command.Type  = LineRemoveCommandType.Horizontal;
   command.Flags = LineRemoveCommandFlags.UseGap | LineRemoveCommandFlags.CallBackRegion;
   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)
{
   Debug.WriteLine("Row Col "   + "( " + e.StartRow.ToString() + ", " + e.StartColumn + " )" +
      "\n Length " + e.Length.ToString());
   e.Status= RemoveStatus.Remove;
}

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;
}

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

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

LineRemoveCommand Members
Leadtools.ImageProcessing.Core Namespace
Cleaning Up 1-Bit Images
SmoothCommand Class
BorderRemoveCommand Class
InvertedTextCommand Class
InvertedPageCommand Class
DotRemoveCommand Class
HolePunchRemoveCommand Class
HighQualityRotateCommand Class
MinimumCommand Class
MaximumCommand Class
Leadtools.ImageProcessing.Effects.RegionHolesRemovalCommand