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GWireCommand Class

Summary

Performs semi-automatic segmentation by creating minimal paths that follow the boundaries of the objects in the image.

Syntax

C#
VB
C++
public class GWireCommand : IDisposable 
Public Class GWireCommand  
   Implements System.IDisposable  
public ref class GWireCommand : public System.IDisposable   

Remarks
  • This command is useful when extracting objects from an image. It works by constructing a minimal path between two input points (the seed and the target points) that follows the edges of the image's objects.
  • The returned minimal paths can be used to create a region that covers the object of interest.
  • If the image contains a region the region is ignored. The GWireCommand works on the entire image.
  • This function 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 only available in the Document/Medical Imaging toolkits.)
  • This command does not support signed images.
Example

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void GWireCommandExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   //Load an image 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")); 
 
   GWireCommand command = new GWireCommand(image, 90); 
 
   List<LeadPoint> SeedPoints = new List<LeadPoint>(); 
 
   // Get the boundaries of the object 
   SeedPoints.Add(new LeadPoint(200, 163)); 
   SeedPoints.Add(new LeadPoint(245, 195)); 
   SeedPoints.Add(new LeadPoint(289, 163)); 
   SeedPoints.Add(new LeadPoint(282, 188)); 
   SeedPoints.Add(new LeadPoint(304, 314)); 
   SeedPoints.Add(new LeadPoint(247, 271)); 
   SeedPoints.Add(new LeadPoint(201, 315)); 
   SeedPoints.Add(new LeadPoint(228, 199)); 
   SeedPoints.Add(new LeadPoint(199, 175)); 
 
   int pointIdx = 0; 
   List<LeadPoint> AllPaths = new List<LeadPoint>(); 
 
   // Loop over the list of SeedPoints to get the minimum path between each set of two points. 
   // And add the minimum path between the two points to the AllPaths List. 
   for (int index = 0; index < 4; index++) 
   { 
      // Set the seed point. 
      command.SetSeedPoint(SeedPoints[pointIdx]); 
 
      pointIdx++; 
      // Get the minimum path from the seed point to the target point. 
      LeadPoint[] minPath = command.GetMinPath(SeedPoints[pointIdx]); 
 
      // Add the minimum path to the AllPaths list to be used later to create a region. 
      AllPaths.AddRange(minPath); 
   } 
 
   // Use the minimum path around the object and convert it to a region. 
   image.AddPolygonToRegion(null, AllPaths.ToArray(), LeadFillMode.Alternate, RasterRegionCombineMode.Set); 
} 
 
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 GWireCommandExample() 
   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 command As GWireCommand = New GWireCommand(image, 90) 
 
   Dim SeedPoints As List(Of LeadPoint) = New List(Of LeadPoint)() 
 
   ' Get the boundaries of the object 
   SeedPoints.Add(New LeadPoint(200, 163)) 
   SeedPoints.Add(New LeadPoint(245, 195)) 
   SeedPoints.Add(New LeadPoint(289, 163)) 
   SeedPoints.Add(New LeadPoint(282, 188)) 
   SeedPoints.Add(New LeadPoint(304, 314)) 
   SeedPoints.Add(New LeadPoint(247, 271)) 
   SeedPoints.Add(New LeadPoint(201, 315)) 
   SeedPoints.Add(New LeadPoint(228, 199)) 
   SeedPoints.Add(New LeadPoint(199, 175)) 
 
   Dim pointIdx As Integer = 0 
   Dim AllPaths As List(Of LeadPoint) = New List(Of LeadPoint)() 
 
   ' Loop over the list of SeedPoints to get the minimum path between each set of two points. 
   ' And add the minimum path between the two points to the AllPaths List. 
   For index As Integer = 0 To 3 
      ' Set the seed point. 
      command.SetSeedPoint(SeedPoints(pointIdx)) 
 
      pointIdx += 1 
      ' Get the minimum path from the seed point to the target point. 
      Dim minPath As LeadPoint() = command.GetMinPath(SeedPoints(pointIdx)) 
 
      ' Add the minimum path to the AllPaths list to be used later to create a region. 
      AllPaths.AddRange(minPath) 
   Next index 
 
   ' Use the minimum path around the object and convert it to a region. 
   image.AddPolygonToRegion(Nothing, AllPaths.ToArray(), LeadFillMode.Alternate, RasterRegionCombineMode.Set) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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Leadtools.ImageProcessing.Core Assembly