AutoCropCommand Class

Summary

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

Syntax

Objective-C

C++/CLI

Java

Python

public class AutoCropCommand : RasterCommand

@interface LTAutoCropCommand : LTRasterCommand

public class AutoCropCommand 
    extends RasterCommand

public ref class AutoCropCommand : public RasterCommand

class AutoCropCommand(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.

Auto Crop Function - Before

Auto Crop Function - After

View additional platform support for this Auto Crop function.

Example

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

Java

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:\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.AutoCropCommand; 
 
 
public void autoCropCommandExample() { 
 
    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 
    AutoCropCommand command = new AutoCropCommand(); 
 
    // AutoCrop the image with 20 tolerance 
    command.setThreshold(20); 
 
    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")); 
}