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LineRemoveCommand Class

Summary
Removes horizontal and vertical lines in a 1-bit black and white image.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public class LineRemoveCommand : RasterCommand 
@interface LTLineRemoveCommand : LTRasterCommand 
public class LineRemoveCommand 
    extends RasterCommand 
public ref class LineRemoveCommand : public RasterCommand   
class LineRemoveCommand(RasterCommand): 
Remarks

This command is available in the Document/Medical Toolkits.

  • 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.

Line Remove Function - Before

Line Remove Function - Before

Line Remove Function - After

Line Remove Function - After

View additional platform support for this Line Remove function.

Example

Run the LineRemoveCommand on an image.

C#
Java
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
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:\LEADTOOLS23\Resources\Images"; 
} 
 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.core.*; 
 
 
public void lineRemoveCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.setThrowExceptionsOnInvalidImages(true); 
 
   RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "Clean.tif")); 
 
   // Prepare the command 
   LineRemoveCommand command = new LineRemoveCommand(); 
   command.addLineRemoveCommandListener(lineRemoveEvent_S1); 
   command.setType(LineRemoveCommandType.HORIZONTAL); 
   command.setFlags(LineRemoveCommandFlags.USE_GAP.getValue()); 
   command.setGapLength(2); 
   command.setMaximumLineWidth(5); 
   command.setMinimumLineLength(200); 
   command.setMaximumWallPercent(10); 
   command.setWall(7); 
 
   command.run(image); 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
 
   assertTrue(new File(combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")).exists()); 
   System.out.println("Command run and image saved to " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
} 
 
LineRemoveCommandListener lineRemoveEvent_S1 = new LineRemoveCommandListener() { 
   @Override 
   public void onLineRemoveEvent(LineRemoveCommandEvent e) { 
      System.out.println("Row Col " + "( " + e.getStartRow() + ", " + e.getStartColumn() + " )" + 
            "\n Length " + e.getLength()); 
      e.setStatus(RemoveStatus.REMOVE); 
   } 
}; 
Requirements

Target Platforms

Help Version 23.0.2024.3.3
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Leadtools.ImageProcessing.Core Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.