pt: set correct focal length from camera fovopentrack-2.3-rc6

Issue: #96

Having user-supplied camera fov, we can prevent yaw and pitch occuring
by itself when moving horizontally and vertically.

Note PointExtractor::extract_points(Mat& frame) should enable same value
for fx and fy:

			c[0] =  (mx/m - W/2)/W;
			c[1] = -(my/m - H/2)/W;

1 files changed, 3 insertions, 0 deletions

diff --git a/ftnoir_tracker_pt/ftnoir_tracker_pt.h b/ftnoir_tracker_pt/ftnoir_tracker_pt.h
index 2f922e17..3dd15618 100644
--- a/ftnoir_tracker_pt/ftnoir_tracker_pt.h
+++ b/ftnoir_tracker_pt/ftnoir_tracker_pt.h
@@ -57,6 +57,9 @@ private:
     };
     void set_command(Command command);
     void reset_command(Command command);
+    
+    float get_focal_length();
+    
     volatile int commands;
 
     CVCamera       camera;