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LEADTOOLS Image Processing (Leadtools.ImageProcessing.Core assembly)
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ZeroToNegativeCommand Class








Members 
Leadtools.ImageProcessing.Core Namespace : ZeroToNegativeCommand Class
Converts a grayscale unsigned image to a signed image by shifting the image data to the negative side by the amount specified by the user.
Object Model
Syntax
'Declaration
 

Public Class ZeroToNegativeCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand 
'Usage
 

Dim instance As ZeroToNegativeCommand
public sealed class ZeroToNegativeCommand : Leadtools.ImageProcessing.IRasterCommand  
@interface LTZeroToNegativeCommand : LTRasterCommand
public class ZeroToNegativeCommand extends RasterCommand
function Leadtools.ImageProcessing.Core.ZeroToNegativeCommand()
Remarks
This command is similar to ConvertUnsignedToSignedCommand. However, MinimumToZeroCommand updates ShiftAmount with the value by which the intensity values were shifted. The updated ShiftAmount value can be passed to ZeroToNegativeCommand to convert the image back to signed (i.e. after using image processing command that works in unsigned 12-16 bit grayscale image).
MinimumToZeroCommand and ZeroToNegativeCommand are most often used in concert with one or more image processing or analysis commands. MinimumToZeroCommand converts signed data to unsigned data, in preparation for image processing or analysis commands that work on unsigned image data. After the image processing or analysis is performed, ZeroToNegativeCommand can be used to converts the unsigned data back to signed data.

This command is used usually after the command MinimumToZeroCommand.

This command updates the Signed property of the RasterImage.

This command also updates the MinValue and MaxValue properties of the RasterImage.

This command supports signed data images and 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. However, this command does not support 8-bit images.

This command does not support 32-bit grayscale images.

In Silverlight versions of LEADTOOLS, this image processing command will fail if the image data for the RasterImage object is stored internally using a Silverlight WriteableBitmap object. For more information, refer to Image Processing Command Limitations in Silverlight.

Example

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

Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

   
Public Sub ZeroToNegativeCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\Beauty16.jpg"))

   ' Prepare the command
   ' Convert the image to unsigned image by shifting the negative values to become positive.
   Dim MinToZCommand As MinimumToZeroCommand = New MinimumToZeroCommand
   MinToZCommand.Run(leadImage)

   ' Apply multiscale enhancement
   Dim MultiScaleCommand As MultiscaleEnhancementCommand = 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.
   Dim command As ZeroToNegativeCommand = New ZeroToNegativeCommand
   command.MinimumInput = -32767
   command.MaximumInput = 32766
   command.MinimumOutput = 0
   command.MaximumOutput = 65535
   command.ShiftAmount = MinToZCommand.ShiftAmount
   command.Run(leadImage)

End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public void ZeroToNegativeCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Beauty16.jpg"));

   // 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:\Users\Public\Documents\LEADTOOLS Images";
}
function ZeroToNegativeCommandExample()
{
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\Beauty16.jpg";
   var processedImage;
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      // Prepare the command
      with (Leadtools.ImageProcessing.Core) {
         // Convert the image to unsigned image by shifting the negative values to become positive.
         var MinToZCommand = new MinimumToZeroCommand();
         MinToZCommand.run(image); 
         
         // Apply multiscale enhancement
         var 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.
         var command = new ZeroToNegativeCommand();
         command.minimumInput  = -32767;
         command.maximumInput  = 32766;
         command.minimumOutput = 0;
         command.maximumOutput = 65535;
         command.shiftAmount   = MinToZCommand.shiftAmount;
         command.run(image);
      }
   });
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public async Task ZeroToNegativeCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Beauty16.jpg";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // 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);

}
using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

public void ZeroToNegativeCommandExample(RasterImage image, Stream outStream)
{
   // 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);

   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.DicomGray, image.BitsPerPixel);
   image.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

Public Sub ZeroToNegativeCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   ' Convert the image to unsigned image by shifting the negative values to become positive.
   Dim MinToZCommand As MinimumToZeroCommand = New MinimumToZeroCommand()
   MinToZCommand.Run(image)
   ' Apply multiscale enhancement
   Dim MultiScaleCommand As MultiscaleEnhancementCommand = _
      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.
   Dim command As ZeroToNegativeCommand = New ZeroToNegativeCommand()
   command.MinimumInput = -32767
   command.MaximumInput = 32766
   command.MinimumOutput = 0
   command.MaximumOutput = 65535
   command.ShiftAmount = MinToZCommand.ShiftAmount
   command.Run(image)

   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.DicomGray, image.BitsPerPixel)
   image.Dispose()
End Sub
Requirements

Target Platforms

See Also

Reference

ZeroToNegativeCommand Members
Leadtools.ImageProcessing.Core Namespace
Leadtools.ImageProcessing.ClearNegativePixelsCommand
ConvertUnsignedToSignedCommand Class
ConvertSignedToUnsignedCommand Class
MinimumToZeroCommand Class

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