Multithreaded cv2.imshow() in Python does not work

Question

I have two cameras (using OpenNI, I have two streams per camera, handled by the same instance of the driver API) and would like to have two threads, each capturing data from

Answer 1

I solved the issue by using mutables, passing a dictionary cam_disp = {} to the thread and reading the value in the main thread. cv2.imshow() works best when kept in the main thread, so this worked perfectly. I am not sure if this is the "right" way to do this, so all suggestions are welcome.

Answer 2

Try moving cv2.namedWindow('RGB' + str(cam)) inside your thread target capture_and_save