InvertedTextCommand Class

Summary

Finds and modifies areas of inverted text in a 1-bit black and white image.

Syntax

Objective-C

C++

Java

public class InvertedTextCommand : RasterCommand

Public Class InvertedTextCommand  
   Inherits RasterCommand

@interface LTInvertedTextCommand : LTRasterCommand

public class InvertedTextCommand extends RasterCommand

public ref class InvertedTextCommand : public RasterCommand

Remarks

This command is available in the Document/Medical Toolkits.

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.

Example

Runs the InvertedTextCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
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:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
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:\LEADTOOLS21\Resources\Images" 
End Class