Calibrate works?

lib/opencv_processing/examples/HoughLineDetection/HoughLineDetection.pde

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+import gab.opencv.*;
+
+OpenCV opencv;
+ArrayList<Line> lines;
+
+void setup() {
+  PImage src = loadImage("film_scan.jpg");
+  src.resize(0, 800);
+  size(src.width, src.height);
+
+  opencv = new OpenCV(this, src);
+  opencv.findCannyEdges(20, 75);
+
+  // Find lines with Hough line detection
+  // Arguments are: threshold, minLengthLength, maxLineGap
+  lines = opencv.findLines(100, 30, 20);
+}
+
+void draw() {
+  image(opencv.getOutput(), 0, 0);
+  strokeWeight(3);
+  
+  for (Line line : lines) {
+    // lines include angle in radians, measured in double precision
+    // so we can select out vertical and horizontal lines
+    // They also include "start" and "end" PVectors with the position
+    if (line.angle >= radians(0) && line.angle < radians(1)) {
+      stroke(0, 255, 0);
+      line(line.start.x, line.start.y, line.end.x, line.end.y);
+    }
+
+    if (line.angle > radians(89) && line.angle < radians(91)) {
+      stroke(255, 0, 0);
+      line(line.start.x, line.start.y, line.end.x, line.end.y);
+    }
+  }
+}
+