Calibrate works?

lib/opencv_processing/examples/RegionOfInterest/RegionOfInterest.pde

@@ -0,0 +1,36 @@
+import gab.opencv.*;
+
+PImage src;
+OpenCV opencv;
+
+int roiWidth = 150;
+int roiHeight = 150;
+
+boolean useROI = true;
+
+void setup() {
+  src = loadImage("test.jpg");
+  opencv = new OpenCV(this, src);
+  size(opencv.width, opencv.height);
+}
+
+void draw() {
+  opencv.loadImage(src);
+
+  if (useROI) {
+    opencv.setROI(mouseX, mouseY, roiWidth, roiHeight);
+  }
+
+  opencv.findCannyEdges(20,75);
+  image(opencv.getOutput(), 0, 0);
+}
+
+// toggle ROI on and off
+void keyPressed() {
+  useROI = !useROI;
+
+  if (!useROI) {
+    opencv.releaseROI();
+  }
+}
+