MinimumToZeroCommand Class

Summary

Converts grayscale signed image to an unsigned one by shifting all the negative value of the image data, so the minimum negative value will be zero.

Syntax

Objective-C

C++/CLI

Java

Python

public class MinimumToZeroCommand : RasterCommand

@interface LTMinimumToZeroCommand : LTRasterCommand

public class MinimumToZeroCommand 
    extends RasterCommand

public ref class MinimumToZeroCommand : public RasterCommand

class MinimumToZeroCommand(RasterCommand):

Remarks

This command is similar to ConvertSignedToUnsignedCommand. This command automatically determines the value to be shift in order to convert the image to unsigned image. This command is used usually before the command ZeroToNegativeCommand. This command updates the Signed property of the RasterImage. This command also updates the MinValue and MaxValue properties of the RasterImage. This command does not support 8-bit images. 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 signed data images. This command does not support 32-bit grayscale images.

Example

This command will apply MultiscaleEnhancementCommand on a signed image, but since the MultiscaleEnhancementCommand does not support signed images, we will convert the image to an unsigned image, apply the effect, and then convert it back to a signed image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void MinimumToZeroCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE2.dcm")); 
 
   // Prepare the command 
   // Convert the image to unsigned image by shifting the negative values to become positive. 
   MinimumToZeroCommand MinToZCommand = new MinimumToZeroCommand(); 
   MinToZCommand.Run(image); 
 
   // Apply multiscale enhancement 
   MultiscaleEnhancementCommand MultiScaleCommand = new MultiscaleEnhancementCommand(2000, 4, -1, 0, 0, MultiscaleEnhancementCommandType.Gaussian, MultiscaleEnhancementCommandFlags.EdgeEnhancement); 
 
   // Convert the image back to signed by shifting the same amount in the negative side. 
   ZeroToNegativeCommand command = new ZeroToNegativeCommand(); 
   command.MinimumInput = -32767; 
   command.MaximumInput = 32766; 
   command.MinimumOutput = 0; 
   command.MaximumOutput = 65535; 
   command.ShiftAmount = MinToZCommand.ShiftAmount; 
   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.RasterImage; 
import leadtools.RasterImageFormat; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.core.*; 
 
 
public void minimumToZeroCommandExample() { 
   // load an image 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.setThrowExceptionsOnInvalidImages(true); 
 
   RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "\\DICOM\\image2.dcm")); 
 
   // Prepare the command 
   // Convert the image to unsigned image by shifting the negative values to become 
   // positive. 
   MinimumToZeroCommand minToZCommand = new MinimumToZeroCommand(); 
   minToZCommand.run(image); 
 
   // Apply multiscale enhancement 
   MultiscaleEnhancementCommand multiScaleCommand = new MultiscaleEnhancementCommand(2000, 4, -1, 0, 0, 
         MultiscaleEnhancementCommandType.GAUSSIAN, MultiscaleEnhancementCommandFlags.EDGE_ENHANCEMENT.getValue()); 
 
   // Convert the image back to signed by shifting the same amount in the negative 
   // side. 
   ZeroToNegativeCommand command = new ZeroToNegativeCommand(); 
   command.setMinimumInput(-32767); 
   command.setMaximumInput(32766); 
   command.setMinimumOutput(0); 
   command.setMaximumOutput(65535); 
   command.setShiftAmount(minToZCommand.getShiftAmount()); 
   command.run(image); 
 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "image2_result.dcm"), RasterImageFormat.DICOM_COLOR, 24); 
   assertTrue(new File(combine(LEAD_VARS_IMAGES_DIR, "image2_result.dcm")).exists()); 
   System.out.println("File Exists"); 
}