diff --git a/etrack/__init__.py b/etrack/__init__.py
index 486c4ba..f7a4541 100644
--- a/etrack/__init__.py
+++ b/etrack/__init__.py
@@ -1,2 +1,2 @@
 from .image_marker import ImageMarker, MarkerTask
-from .tracking_result import TrackingResult
\ No newline at end of file
+from .tracking_result import TrackingResult, coordinate_transformation
\ No newline at end of file
diff --git a/etrack/image_marker.py b/etrack/image_marker.py
index 8ad7bad..49bc894 100644
--- a/etrack/image_marker.py
+++ b/etrack/image_marker.py
@@ -17,7 +17,7 @@ class ImageMarker:
         self._fig.canvas.mpl_connect('button_press_event', self._on_click_event)
         self._fig.canvas.mpl_connect('close_event', self._fig_close_event)
         self._fig.canvas.mpl_connect('key_press_event', self._key_press_event)
-    
+
     def mark_movie(self, filename, frame_number=0):
         if not os.path.exists(filename):
             raise IOError("file %s does not exist!" % filename)
@@ -30,6 +30,7 @@ class ImageMarker:
             print("Reading frame: %i" % frame_counter, end="\r")
             success, frame = video.read()
             frame_counter += 1
+
         if success:
            self._fig.gca().imshow(frame)
         else:
diff --git a/etrack/tracking_result.py b/etrack/tracking_result.py
index 2e7d3e2..1d3bee9 100644
--- a/etrack/tracking_result.py
+++ b/etrack/tracking_result.py
@@ -14,6 +14,10 @@ y_factor = 0.81/height  # Einheit m/px
 center = (np.round(x_0 + width/2), np.round(y_0 + height/2))
 center_meter = ((center[0] - x_0) * x_factor, (center[1] - y_0) * y_factor)
 """
+def coordinate_transformation(position,x_0, y_0, x_factor, y_factor):
+        x = (position[0] - x_0) * x_factor
+        y = (position[1] - y_0) * y_factor
+        return (x, y) #in m 
 
 class TrackingResult(object):