OtsuThresholdCommand Class

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Visual Basic
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Java
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public class OtsuThresholdCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration

Public Class OtsuThresholdCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage

Dim instance As OtsuThresholdCommand

public sealed class OtsuThresholdCommand : Leadtools.ImageProcessing.IRasterCommand

@interface LTOtsuThresholdCommand : LTRasterCommand

public class OtsuThresholdCommand extends RasterCommand

function Leadtools.ImageProcessing.Core.OtsuThresholdCommand()

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

This command works only with grayscale images. If the input image is colored it will be converted to a grayscale image.
Otsu clustering is performed by making each cluster as compact as possible so as to minimize overlap. If one adjusts a threshold one way, the spread of one cluster gets larger and the spread for the second cluster gets smaller. Different threshold values are tried until the one is found which produces the minimum combined spread.
Otsu thresholding is typically used as a way to binarize an image. It is best when used on an image that has a bimodal histogram (Clusters = 2).
This command supports 8, 16-bit grayscale images and 24, 32-bit colored images. Support for 16-bit grayscale is available in the Document/Medical Imaging toolkits.
This command supports signed/unsigned images.

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

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

   
Public Sub OtsuThresholdCommandExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   'Load an image
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg"))

   'Prepare the command
   Dim command As OtsuThresholdCommand = New OtsuThresholdCommand()

   'Apply 
   command.Clusters = 7
   command.Run(image)
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 OtsuThresholdCommandExample()
{
    RasterCodecs codecs = new RasterCodecs();
    codecs.ThrowExceptionsOnInvalidImages = true;
    //Load an image
    RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\NaturalFruits.jpg"));

    //Prepare the command
    OtsuThresholdCommand command = new OtsuThresholdCommand();

    //Apply 
    command.Clusters = 4;
    command.Run(image);
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

OtsuThresholdCommand Members
Leadtools.ImageProcessing.Core Namespace
KMeansCommand Class
LambdaConnectednessCommand Class
ShrinkWrapCommand Class
WatershedCommand Class
GWireCommand Class