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AutoCropCommand Class

Summary

Trims the current image, removing blank space around the edges.

Syntax

C#
VB
Java
Objective-C
WinRT C#
C++
public class AutoCropCommand : RasterCommand 
@interface LTAutoCropCommand : LTRasterCommand 
public class AutoCropCommand extends RasterCommand 
function Leadtools.ImageProcessing.Core.AutoCropCommand() 

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 supports unsigned data images, but not signed ones.
  • This command does not support 32-bit grayscale images.

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

Example

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

C#
VB
Silverlight C#
Silverlight VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void AutoCropCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "clean.tif")); 
 
   // 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"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
      Leadtools.Examples.Support.SetLicense() 
 
Public Sub AutoCropCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "clean.tif")) 
 
   ' 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 
using Leadtools; 
using Leadtools.Examples; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
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(); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
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 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.ImageProcessing.Core Assembly