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AutoCropCommand Class
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Leadtools.ImageProcessing.Core Namespace : AutoCropCommand Class



Trims the current image, removing blank space around the edges. Supported in Silverlight, Windows Phone 7

Object Model

AutoCropCommand Class

Syntax

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

Example

Run the AutoCropCommand on an image and then AutoCrops the image.

Visual BasicCopy Code
Public Sub AutoCropCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim command As AutoCropCommand = New AutoCropCommand()
   ' AutoCrop the image with 20 tolerance.
   command.Threshold = 20
   command.Run(image)

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 AutoCropCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // Prepare the command
      AutoCropCommand command   = new AutoCropCommand();
      //AutoCrop the image with 20 tolerance.
      command.Threshold         = 20;
      command.Run(image);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void AutoCropCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   AutoCropCommand command   = new AutoCropCommand();
   //AutoCrop the image with 20 tolerance.
   command.Threshold         = 20;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1);
   image.Dispose();
}
SilverlightVBCopy Code
Public Sub AutoCropCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As AutoCropCommand = New AutoCropCommand()
   'AutoCrop the image with 20 tolerance.
   command.Threshold = 20
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1)
   image.Dispose()
End Sub

Remarks

  • Generally, this command is used for automatically trimming blank space from the edges of scanned documents.
  • Nevertheless, because this command uses changes in intensity to detect blank space, it can trim edges of any color or intensity.
  • If a region is defined for the image, the region is also trimmed if necessary.
  • This command supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support signed data images.
  • This command does not support 32-bit grayscale images.
For more information, refer to Introduction to Image Processing With LEADTOOLS.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.AutoCropCommand

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