AutoCropCommand Class

Summary

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

Syntax

Objective-C

C++

Java

public class AutoCropCommand : RasterCommand

Public Class AutoCropCommand  
   Inherits RasterCommand

@interface LTAutoCropCommand : LTRasterCommand

public class AutoCropCommand extends RasterCommand

public ref class AutoCropCommand : public RasterCommand

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.

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 
 
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

c#[Silverlight C# Example] 
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(); 
} 
vb[Silverlight VB Example] 
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