WatershedCommand Class

Summary

Separates the image into different segments using the Watershed algorithm.

Syntax

Objective-C

C++

Java

public class WatershedCommand : RasterCommand

Public Class WatershedCommand  
   Inherits RasterCommand

@interface LTWatershedCommand : LTRasterCommand

public class WatershedCommand extends RasterCommand

public ref class WatershedCommand : public RasterCommand

Remarks

Each segment's pixels has the same color. The Watershed algorithm treats an image as if it were a topographic surface. The dark areas are basins. The light areas are the ridges around the basins.
The user is responsible for determining the number of output segments and the location of each segment in the input array.
This command supports 8, 16-bit grayscale and colored images and 24, 32-bit colored images.
This command does not support 32-bit grayscale images.
This command supports signed/unsigned images.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void WatershedCommandExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   //Load an image 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")); 
 
   LeadPoint[][] pointsArray = new LeadPoint[4][]; 
 
   for (int idx = 0; idx < 4; idx++) 
      pointsArray[idx] = new LeadPoint[2]; 
 
   // Set starting point and end point for each segment path. 
   pointsArray[0][0] = new LeadPoint(35, 100); 
   pointsArray[0][1] = new LeadPoint(35, 200); 
 
   pointsArray[1][0] = new LeadPoint(180, 115); 
   pointsArray[1][1] = new LeadPoint(300, 115); 
 
   pointsArray[2][0] = new LeadPoint(235, 220); 
   pointsArray[2][1] = new LeadPoint(260, 220); 
 
   pointsArray[3][0] = new LeadPoint(180, 330); 
   pointsArray[3][1] = new LeadPoint(350, 330); 
 
   //Prepare the command 
   WatershedCommand command = new WatershedCommand(pointsArray); 
 
   //Apply  
   command.Run(image); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub WatershedCommandExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   'Load an image 
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")) 
 
   Dim pointsArray As LeadPoint()() = New LeadPoint(3)() {} 
 
   For idx As Integer = 0 To 3 
      pointsArray(idx) = New LeadPoint(1) {} 
   Next idx 
 
   ' Set starting point and end point for each segment path. 
   pointsArray(0)(0) = New LeadPoint(35, 100) 
   pointsArray(0)(1) = New LeadPoint(35, 200) 
 
   pointsArray(1)(0) = New LeadPoint(180, 115) 
   pointsArray(1)(1) = New LeadPoint(300, 115) 
 
   pointsArray(2)(0) = New LeadPoint(235, 220) 
   pointsArray(2)(1) = New LeadPoint(260, 220) 
 
   pointsArray(3)(0) = New LeadPoint(180, 330) 
   pointsArray(3)(1) = New LeadPoint(350, 330) 
 
   'Prepare the command 
   Dim command As WatershedCommand = New WatershedCommand(pointsArray) 
 
   'Apply  
   command.Run(image) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class