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InvertedTextCommand Class
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Leadtools.ImageProcessing.Core Namespace : InvertedTextCommand Class



Finds and modifies areas of inverted text 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

InvertedTextCommand Class

Syntax

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

Example

Runs the InvertedTextCommand on an image.

Visual BasicCopy Code
Public WithEvents invertedTextCommand_S1 As InvertedTextCommand
Public Sub InvertedTextCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

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

   ' Prepare the command
   invertedTextCommand_S1 = New InvertedTextCommand
   invertedTextCommand_S1.Flags = InvertedTextCommandFlags.UseDpi
   invertedTextCommand_S1.MaximumBlackPercent = 95
   invertedTextCommand_S1.MinimumBlackPercent = 70
   invertedTextCommand_S1.MinimumInvertHeight = 500
   invertedTextCommand_S1.MinimumInvertWidth = 5000

   invertedTextCommand_S1.Run(leadImage)

End Sub

Private Sub InvertedTextCommand_InvertedText_S1(ByVal sender As Object, ByVal e As InvertedTextCommandEventArgs) Handles invertedTextCommand_S1.InvertedText
   MessageBox.Show("Size " + "( " + e.BoundingRectangle.Left.ToString() + ", " + e.BoundingRectangle.Top.ToString() + ") - " + "( " + e.BoundingRectangle.Right.ToString() + ", " + e.BoundingRectangle.Bottom.ToString() + ")" + _
            Chr(13) + " Black Count " + e.BlackCount.ToString() + _
            Chr(13) + " White Count " + e.WhiteCount.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 InvertedTextCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

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

      // Prepare the command
      InvertedTextCommand command = new InvertedTextCommand();
      command.InvertedText  += new EventHandler<InvertedTextCommandEventArgs>(InvertedTextEvent_S1);
      command.Flags         = InvertedTextCommandFlags.UseDpi;
      command.MaximumBlackPercent = 95;
      command.MinimumBlackPercent = 70;
      command.MinimumInvertHeight = 500;
      command.MinimumInvertWidth  = 5000;

      command.Run(image);

   }

   private void InvertedTextEvent_S1(object sender, InvertedTextCommandEventArgs e)
   {

      MessageBox.Show("Size "           + "( " + e.BoundingRectangle.Left + ", " + e.BoundingRectangle.Top + ") - " + "( " + e.BoundingRectangle.Right + ", " + e.BoundingRectangle.Bottom + ")" +
         "\n Black Count " + e.BlackCount.ToString() + 
         "\n White Count " + e.WhiteCount.ToString());
      e.Status = RemoveStatus.Remove;
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void InvertedTextCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   InvertedTextCommand command = new InvertedTextCommand();
   command.InvertedText  += new EventHandler<InvertedTextCommandEventArgs>(InvertedTextEvent_S1);
   command.Flags         = InvertedTextCommandFlags.UseDpi;
   command.MaximumBlackPercent = 95;
   command.MinimumBlackPercent = 70;
   command.MinimumInvertHeight = 500;
   command.MinimumInvertWidth  = 5000;
   command.Run(image);

   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1);
   image.Dispose();
}

private void InvertedTextEvent_S1(object sender, InvertedTextCommandEventArgs e)
{

   Debug.WriteLine("Size "           + "( " + e.BoundingRectangle.Left + ", " + e.BoundingRectangle.Top + ") - " + "( " + e.BoundingRectangle.Right + ", " + e.BoundingRectangle.Bottom + ")" +
      "\n Black Count " + e.BlackCount.ToString() + 
      "\n White Count " + e.WhiteCount.ToString());
   e.Status = RemoveStatus.Remove;
}
SilverlightVBCopy Code
Public Sub InvertedTextCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As InvertedTextCommand = New InvertedTextCommand()
   AddHandler command.InvertedText, AddressOf InvertedTextEvent_S1
   command.Flags = InvertedTextCommandFlags.UseDpi
   command.MaximumBlackPercent = 95
   command.MinimumBlackPercent = 70
   command.MinimumInvertHeight = 500
   command.MinimumInvertWidth = 5000
   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 InvertedTextEvent_S1(ByVal sender As Object, ByVal e As InvertedTextCommandEventArgs)

   Debug.WriteLine("Size " & "( " & e.BoundingRectangle.Left & ", " & e.BoundingRectangle.Top & ") - " & "( " & e.BoundingRectangle.Right & ", " & e.BoundingRectangle.Bottom & ")" & Constants.vbLf & " Black Count " & e.BlackCount.ToString() & Constants.vbLf & " White Count " & e.WhiteCount.ToString())
   e.Status = RemoveStatus.Remove
End Sub

Remarks

  • This command finds and modifies areas of inverted text that are common in scanned text documents. Below is an example of inverted text:


    Modifying the area of inverted text yields the following:


  • The behavior of this command can be modified by using an Event Handler that handles the InvertedTextCommandEventArgs.
  • 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 method. 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.InvertedTextCommand

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