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InvertedTextCommand Class
See Also  Members   Example 
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.

Syntax

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

Example

Runs the InvertedTextCommand on an image.

Visual BasicCopy Code
Public WithEvents invertedTextCommand_S1 As InvertedTextCommand
Public Sub InvertedTextCommandExample()
   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
   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)

   RasterCodecs.Shutdown()
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
C#Copy Code
public void InvertedTextCommandExample() 
{ 
   // 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 
   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); 
 
   RasterCodecs.Shutdown(); 
} 
 
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; 
}

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: 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