cache image

src/Calibrator.java

@@ -26,7 +26,7 @@ class Calibrator {
         this.active = false;
     }
 
-    void toggle() { 
+    void toggle() {
         if (this.active) {
             this.deactivate();
         } else {

src/Camera.java

@@ -33,13 +33,14 @@ class Camera {
 
         if (newImageAvailable) {
             cam.read();
+            latestImage = cam;
         }
 
         return newImageAvailable;
     }
 
     PImage getImage() {
-        return cam;
+        return latestImage;
     }
 
 }