The official 0.4 release!

Also, added an unwrapped Hough lines example in prep for wrapping it.

Author: atduskgreg

examples/HoughLineDetection/HoughLineDetection.pde

@@ -0,0 +1,63 @@
+import gab.opencv.*;
+import org.opencv.imgproc.Imgproc;
+import org.opencv.core.Mat;
+import java.awt.geom.Line2D;
+
+OpenCV opencv;
+
+ArrayList<Line2D> lines;
+
+void setup() {
+  PImage src = loadImage("film_scan.jpg");
+  src.resize(0, 800);
+  size(src.width, src.height, P2D);
+
+  opencv = new OpenCV(this, src);
+  opencv.findSobelEdges(1, 0);
+  opencv.threshold(20);
+
+  lines = findLines(opencv.getGray(), 200, 120, 5);
+  
+  for(Line2D l : lines){
+    println(Math.toDegrees(angleOf(l)));
+  }
+  
+  noLoop();
+}
+
+double angleOf(Line2D l){
+   Line2D vertical = new Line2D.Double(0,0, 0,1);
+   
+   return angleBetween(l, vertical);
+}
+
+double angleBetween(Line2D line1, Line2D line2) {
+  double angle1 = Math.atan2(line1.getY1() - line1.getY2(), 
+  line1.getX1() - line1.getX2());
+  double angle2 = Math.atan2(line2.getY1() - line2.getY2(), 
+  line2.getX1() - line2.getX2());
+  return angle1-angle2;
+}
+
+ArrayList<Line2D> findLines(Mat m, int threshold, double minLength, double maxGap) {
+  ArrayList<Line2D> result = new ArrayList<Line2D>();
+
+  Mat lineMat = new Mat();
+  Imgproc.HoughLinesP(m, lineMat, 1, PI/180.0, threshold, minLength, maxGap);
+  for (int i = 0; i < lineMat.width(); i++) {
+    double[] coords = lineMat.get(0, i);
+    result.add(new Line2D.Double(coords[0], coords[1], coords[2], coords[3]));
+  }
+
+  return result;
+}
+
+void draw() {
+  image(opencv.getOutput(), 0, 0);
+  stroke(0, 255, 0);
+  strokeWeight(2);
+  for (Line2D line : lines) {
+    line((float)line.getX1(), (float)line.getY1(), (float)line.getX2(), (float)line.getY2());
+  }
+}
+

examples/HoughLineDetection/film_scan.jpg

@@ -154,7 +154,7 @@ library.version=5
 
 # The version as the user will see it. 
 
-library.prettyVersion=0.4-beta1
+library.prettyVersion=0.4
 
 
 library.copyright=(c) 2013