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.
public class MinimumToZeroCommand : RasterCommand
Public Class MinimumToZeroCommand
Inherits RasterCommand
@interface LTMinimumToZeroCommand : LTRasterCommand
public class MinimumToZeroCommand extends RasterCommand
public ref class MinimumToZeroCommand : public RasterCommand
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.
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.
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:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core
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#[Silverlight C# Example]
using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;
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();
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core
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
Leadtools.ImageProcessing.Core Namespace
Leadtools.ImageProcessing.ClearNegativePixelsCommand
ConvertSignedToUnsignedCommand Class
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