Calibrate works?

lib/opencv_processing/examples/DilationAndErosion/DilationAndErosion.pde

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+import gab.opencv.*;
+
+PImage src, dilated, eroded, both;
+OpenCV opencv;
+
+void setup() {
+  src = loadImage("pen_sketch.jpg"); 
+  src.resize(src.width/2, 0);
+  size(src.width*2, src.height*2);
+
+  opencv = new OpenCV(this, src);
+
+  // Dilate and Erode both need a binary image
+  // So, we'll make it gray and threshold it.
+  opencv.gray();
+  opencv.threshold(100);
+  // We'll also invert so that erosion eats away the lines
+  // and dilation expands them (rather than vice-versa)
+  opencv.invert();
+   // save a snapshot to use in both operations
+  src = opencv.getSnapshot();
+
+  // erode and save snapshot for display
+  opencv.erode();
+  eroded = opencv.getSnapshot();
+
+  // reload un-eroded image and dilate it
+  opencv.loadImage(src);
+  opencv.dilate();
+  // save dilated version for display
+  dilated = opencv.getSnapshot();
+  // now erode on top of dilated version to close holes
+  opencv.erode();
+  both = opencv.getSnapshot();
+ 
+  noLoop();
+}
+
+void draw() {
+  image(src, 0, 0);
+  image(eroded, src.width, 0);
+  image(dilated, 0, src.height);  
+  image(both, src.width, src.height);  
+
+  fill(0, 255, 0);
+  text("original", 20, 20);
+  text("erode", src.width + 20, 20);
+  text("dilate", 20, src.height+20);
+  text("dilate then erode\n(close holes)", src.width+20, src.height+20);
+}
+