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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.

Syntax

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

Example

Visual BasicCopy Code
ImageProcessing.Core.MinimumToZeroCommand
   Public Sub MinimumToZeroCommandExample()
      RasterCodecs.Startup()
      Dim codecs As New RasterCodecs()
      codecs.ThrowExceptionsOnInvalidImages = True

      Dim leadImage As RasterImage = codecs.Load("C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\IMAGE2.dic")

      ' 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)

      RasterCodecs.Shutdown()
   End Sub
C#Copy Code
ImageProcessing.Core.MinimumToZeroCommand 
      public void MinimumToZeroCommandExample() 
      { 
         // Load an image 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
         codecs.ThrowExceptionsOnInvalidImages = true; 
 
         RasterImage image = codecs.Load(@"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\IMAGE2.dic"); 
 
         // 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); 
 
         RasterCodecs.Shutdown(); 
      }

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.

Inheritance Hierarchy

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

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also