Added some code.

dodgeballtracker/logic.py

@@ -63,6 +63,31 @@ def crazy_experiment(frame):
     cv2.polylines(frame, pts, True, (0, 255, 255), 8)
 
 
+def get_court_perspective_transform():
+    """
+    """
+    empirical_top_left = np.float32([416, 175])
+    empirical_top_right = np.float32([905, 173])
+    empirical_bottom_left = np.float32([51, 702])
+    empirical_bottom_right = np.float32([1188, 695])
+
+    court_top_left = np.float32([0, 0])
+    court_top_right = np.float32([9, 0])
+    court_bottom_left = np.float32([0, 18])
+    court_bottom_right = np.float32([9, 18])
+
+    empirical_source = np.float32([empirical_top_left,
+                                  empirical_top_right,
+                                  empirical_bottom_left,
+                                  empirical_bottom_right])
+    pixel_per_meter = 50
+    empirical_target = np.float32([court_top_left,
+                                  court_top_right,
+                                  court_bottom_left,
+                                  court_bottom_right]) * pixel_per_meter
+    return cv2.getPerspectiveTransform(empirical_source, empirical_target)
+
+
 def main(input_filename: Path, output_filename: Path, detected_box_objects):
     # define some constants
     detected_box_objects = sorted(detected_box_objects, reverse=True)