wrap prepare_cv2_imshow in a function

bnpm/video.py

@@ -17,17 +17,25 @@
 ##  systems that do not support cv2.imshow like servers.
 ## Also be sure to import BNPM before importing most other
 ##  modules.
-try:
+def prepare_cv2_imshow():
+    """
+    This function is necessary because cv2.imshow() 
+     can crash the kernel if called after importing 
+     av and decord.
+    RH 2022
+    """
+    import numpy as np
+    import cv2
     test = np.zeros((1,300,400,3))
     for frame in test:
-        cv2.putText(frame, "Prepping CV2", (10,50), cv2.FONT_HERSHEY_SIMPLEX, 1, (255,255,255), 2)
-        cv2.putText(frame, "Calling this figure allows cv2.imshow ", (10,100), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255,255,255), 1)
-        cv2.putText(frame, "to run after importing av and decord", (10,120), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255,255,255), 1)
+        cv2.putText(frame, "WELCOME TO FACE RHYTHM!", (10,50), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (255,255,255), 2)
+        cv2.putText(frame, "Prepping CV2", (10,100), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (255,255,255), 2)
+        cv2.putText(frame, "Calling this figure allows cv2.imshow ", (10,150), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255,255,255), 1)
+        cv2.putText(frame, "to work without crashing if this function", (10,170), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255,255,255), 1)
+        cv2.putText(frame, "is called before importing av and decord", (10,190), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255,255,255), 1)
         cv2.imshow('startup', frame)
         cv2.waitKey(100)
     cv2.destroyWindow('startup')
-except:
-    pass
 ###############################################################################