MinimumToZeroCommand Class

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.

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class MinimumToZeroCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class MinimumToZeroCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As MinimumToZeroCommand

public sealed class MinimumToZeroCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Core.MinimumToZeroCommand()

public ref class MinimumToZeroCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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 Leadtools.RasterImage.Signed property of the Leadtools.RasterImage.

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

In Silverlight and Windows Phone 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

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Public Sub MinimumToZeroCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = 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.
   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

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:\Users\Public\Documents\LEADTOOLS Images";
}

function MinimumToZeroCommandExample()
{
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\Image2.dcm";
   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);
      }
   });
}

[TestMethod]
public async Task MinimumToZeroCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Image2.dcm";
   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);

}

public void MinimumToZeroCommandExample(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();
}

Public Sub MinimumToZeroCommandExample(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: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

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