Convex Hull in CSharp: Difference between revisions
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== 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"> | |||
#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 | for (int i = 0; i < 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 | Image<Bgr, Byte> img = new Image<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 | Array.ConvertAll<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> | |||
== Result == | == Result == | ||
[[image:ConvexHullExample.png]] | [[image:ConvexHullExample.png]] | ||
Revision as of 03:31, 24 November 2010
System Requirement
| Component | Requirement | Detail |
|---|---|---|
| Emgu CV | Version 1.5 | |
| Operation System | Cross Platform |
Source Code
<source lang="csharp">
- 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));
}
- 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
