Difference between revisions of "Convex Hull in CSharp"

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</div>
 
== System Requirement ==
 
== System Requirement ==
 
{| style="text-align:center" border="1px" cellpadding="10" cellspacing="0"
 
{| style="text-align:center" border="1px" cellpadding="10" cellspacing="0"
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== Source Code ==
 
== Source Code ==
<source lang="csharp">
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&lt;source lang="csharp">
 
#region Create some random points
 
#region Create some random points
 
Random r = new Random();
 
Random r = new Random();
 
PointF[] pts = new PointF[200];
 
PointF[] pts = new PointF[200];
for (int i = 0; i < pts.Length; i++)
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for (int i = 0; i &lt; pts.Length; i++)
 
{
 
{
 
   pts[i] = new PointF((float)(100 + r.NextDouble() * 400), (float)(100 + r.NextDouble() * 400));
 
   pts[i] = new PointF((float)(100 + r.NextDouble() * 400), (float)(100 + r.NextDouble() * 400));
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#endregion
 
#endregion
  
Image<Bgr, Byte> img = new Image<Bgr, byte>(600, 600, new Bgr(255.0, 255.0, 255.0));
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Image&lt;Bgr, Byte> img = new Image&lt;Bgr, byte>(600, 600, new Bgr(255.0, 255.0, 255.0));
 
//Draw the points  
 
//Draw the points  
 
foreach (PointF p in pts)
 
foreach (PointF p in pts)
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   watch.Stop();
 
   watch.Stop();
 
   img.DrawPolyline(
 
   img.DrawPolyline(
       Array.ConvertAll<PointF, Point>(hull, Point.Round),
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       Array.ConvertAll&lt;PointF, Point>(hull, Point.Round),
 
       true, new Bgr(255.0, 0.0, 0.0), 1);
 
       true, new Bgr(255.0, 0.0, 0.0), 1);
  
 
   ImageViewer.Show(img, String.Format("Convex Hull Computed in {0} milliseconds", watch.ElapsedMilliseconds));
 
   ImageViewer.Show(img, String.Format("Convex Hull Computed in {0} milliseconds", watch.ElapsedMilliseconds));
 
}
 
}
</source>
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&lt;/source>
  
 
== Result ==
 
== Result ==
 
[[image:ConvexHullExample.png]]
 
[[image:ConvexHullExample.png]]

Revision as of 03:31, 24 November 2010



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System Requirement

Component Requirement Detail
Emgu CV Version 1.5
Operation System Cross Platform

Source Code

<source lang="csharp">

  1. region Create some random points

Random r = new Random(); PointF[] pts = new PointF[200]; for (int i = 0; i < pts.Length; i++) {

  pts[i] = new PointF((float)(100 + r.NextDouble() * 400), (float)(100 + r.NextDouble() * 400));

}

  1. endregion

Image<Bgr, Byte> img = new Image<Bgr, byte>(600, 600, new Bgr(255.0, 255.0, 255.0)); //Draw the points foreach (PointF p in pts)

  img.Draw(new CircleF(p, 3), new Bgr(0.0, 0.0, 0.0), 1);

//Find and draw the convex hull using (MemStorage storage = new MemStorage()) {

  Stopwatch watch = Stopwatch.StartNew();
  PointF[] hull = PointCollection.ConvexHull(pts, storage, Emgu.CV.CvEnum.ORIENTATION.CV_CLOCKWISE).ToArray();
  watch.Stop();
  img.DrawPolyline(
      Array.ConvertAll<PointF, Point>(hull, Point.Round),
      true, new Bgr(255.0, 0.0, 0.0), 1);
  ImageViewer.Show(img, String.Format("Convex Hull Computed in {0} milliseconds", watch.ElapsedMilliseconds));

} </source>

Result

ConvexHullExample.png