did some cropping

src/papillon.cpp

@@ -65,7 +65,10 @@ class Traite_image {
 
 			Mat next_stab;
 			stabiliseImg(prev, next, next_stab);
-			searchForMovement(prev, next_stab, output);
+            Rect myROI(next_stab.size().width/4, next_stab.size().height/4, next_stab.size().width/2, next_stab.size().height/2);
+            Mat next_stab_cropped = next_stab(myROI);
+            Mat prev_cropped = prev(myROI);
+			searchForMovement(prev_cropped, next_stab_cropped, output);
 
 
 			pub.publish(cv_bridge::CvImage(msg->header, "rgb8", output).toImageMsg());