convex hull implementation for Contour

Author: atduskgreg

src/gab/opencv/Contour.java

@@ -7,7 +7,8 @@
 import org.opencv.core.MatOfPoint2f;
 import org.opencv.imgproc.Imgproc;
 import org.opencv.core.Rect;
-
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfInt;
 import org.opencv.core.Point;
 
 import java.awt.Rectangle;
@@ -17,29 +18,29 @@ public class Contour {
 	private ArrayList<PVector> points;
 	private Point[] inputPoints;
 	private double polygonApproximationFactor;
-	PApplet parent;
-	Rectangle boundingBox;
+	private PApplet parent;
+	private Rectangle boundingBox;
+	public MatOfPoint pointMat;
 
 	public Contour(PApplet parent, MatOfPoint mat){
 		polygonApproximationFactor = mat.size().height * 0.01;
 		this.parent = parent;
+		this.pointMat = mat;
 
 		Rect r = Imgproc.boundingRect(mat);
 		boundingBox = new Rectangle(r.x, r.y, r.width, r.height);
-		
 	    loadPoints(mat.toArray());
 	}
 
 	public Contour(PApplet parent, MatOfPoint2f mat){
 		polygonApproximationFactor = mat.size().height * 0.01;
 		this.parent = parent;
+		this.pointMat = new MatOfPoint(mat.toArray());
 
 		Rect r = Imgproc.minAreaRect(mat).boundingRect();
 		boundingBox = new Rectangle(r.x, r.y, r.width, r.height);
-
 		loadPoints(mat.toArray());	    
 	}
-
 
 	public void loadPoints(Point[] pts){
 	    points = new ArrayList<PVector>();
@@ -68,6 +69,25 @@ public Contour getPolygonApproximation(){
 		return new Contour(parent, approx);
 	}
 
+	public Contour getConvexHull(){
+		
+		  MatOfInt hull = new MatOfInt();
+		  MatOfPoint points = new MatOfPoint(pointMat);
+		  
+		  
+		  Imgproc.convexHull(points, hull);
+		  Point[] hp = new Point[hull.height()];
+		  
+		  for(int i = 0; i < hull.height(); i++){
+			  int index = (int)hull.get(i,0)[0];
+			  hp[i] = new Point(pointMat.get(index,0));
+		  }
+		  MatOfPoint hullPoints = new MatOfPoint();
+		  hullPoints.fromArray(hp);
+
+		  return new Contour(parent, hullPoints);
+	}
+	
 	public void draw(){
 		parent.beginShape();
 		for (PVector p : points) {

src/gab/opencv/OpenCV.java

@@ -109,7 +109,7 @@ public class OpenCV {
 
 	private boolean nativeLoaded;
 
-	CascadeClassifier classifier;
+	public CascadeClassifier classifier;
 	BackgroundSubtractorMOG backgroundSubtractor;
 
 	public final static String VERSION = "##library.prettyVersion##";
@@ -477,7 +477,7 @@ public PVector min(){
 		return OpenCV.pointToPVector(r.minLoc);
 	}
 
-	private static PVector pointToPVector(Point p){
+	public static PVector pointToPVector(Point p){
 		return new PVector((float)p.x, (float)p.y);
 	}