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MinimumToZeroCommand Class
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Leadtools.ImageProcessing.Core Namespace : 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. Supported in Silverlight, Windows Phone 7

Object Model

MinimumToZeroCommand Class

Syntax

Visual Basic (Declaration) 
Public Class MinimumToZeroCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As MinimumToZeroCommand
C# 
public class MinimumToZeroCommand : Leadtools.ImageProcessing.RasterCommand, IRasterCommand 
C++/CLI 
public ref class MinimumToZeroCommand : public Leadtools.ImageProcessing.RasterCommand, IRasterCommand 

Example

This command will apply Leadtools.ImageProcessing.Core.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.

Visual BasicCopy Code
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
C#Copy Code
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";
}
SilverlightCSharpCopy Code
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();
}
SilverlightVBCopy Code
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

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.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.MinimumToZeroCommand

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also