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DeskewCommand Class

Rotates the specified image to straighten it.
public class DeskewCommand : RasterCommand 
Public Class DeskewCommand  
   Inherits RasterCommand 
@interface LTDeskewCommand : LTRasterCommand 
public class DeskewCommand extends RasterCommand 
public ref class DeskewCommand : public RasterCommand   

This command is typically used to automatically straighten scanned images, including bank checks. This command is available in the Document/Medical Toolkits.

This command contains a special algorithm for detecting the skewed checks. To use this, add the following flags to Flags property (DeskewCommandFlags.UseCheckDeskew | DeskewCommandFlags.UseLineDetectionCheckDeskew)

  • If the Flags property or the flags parameter of the Constructor contains DeskewCommandFlags.ReturnAngleOnly, the command will update the Angle property without rotating the image.
  • The calculated rotation is limited to 20 degrees in either direction. This command is intended for images, such as scanned documents, that are mainly horizontal lines of text. The results are less predictable with other types of images.
  • This command includes an option to skip deskewing if the angle is very small.
  • This command does not support 12 and 16-bit grayscale and 48 and 64-bit color images. If the image is 12 and 16-bit grayscale and 48 and 64-bit color, the command will not throw an exception.
  • This command supports signed/unsigned data images.
  • This command does not support 32-bit grayscale images.

For more information, refer to Introduction to Image Processing With LEADTOOLS and Deskewing.


Runs the DeskewCommand on an image and straightens it.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
public void DeskewCommandExample() 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Clean.tif")); 
   // Prepare the command 
   DeskewCommand command = new DeskewCommand(); 
   //Deskew the image. 
   command.Flags = DeskewCommandFlags.DeskewImage | DeskewCommandFlags.DoNotFillExposedArea; 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
Public Sub DeskewCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Clean.tif")) 
   ' Prepare the command 
   Dim command As DeskewCommand = New DeskewCommand 
   'Deskew the image. 
   command.Flags = DeskewCommandFlags.DeskewImage Or DeskewCommandFlags.DoNotFillExposedArea 
End Sub 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class 

Target Platforms

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Leadtools.ImageProcessing.Core Assembly