Convert str to numpy.ndarray

问题:

I'm creating a system to share video with opencv but I've got a problem. I've a server and a client but when I send informations to the server, the must be bytes. I send 2 things:

 ret, frame = cap.read() 

ret is a booland frame is the data video, a numpy.ndarray ret is not a problem but frame: I convert it in string and then in bytes:

frame = str(frame).encode() connexion_avec_serveur.send(frame) 

I'd like now to convert again frame in a numpy.ndarray.

回答1:

Your str(frame).encode() is wrong. If you print it to terminal, then you will find it is not the data of the frame.

An alternative method is to use tobytes() and frombuffer().

## read ret, frame = cap.read() sz = frame.shape  ## tobytes  frame_bytes = frame.tobytes() print(type(frame_bytes)) # <class 'bytes'>  ## frombuffer and reshape  frame_frombytes = np.frombuffer(frame_bytes, dtype=np.uint8).reshape(sz) print(type(frame_frombytes)) ## <class 'numpy.ndarray'>  ## test whether they equal or not  print(np.array_equal(frame, frame_frombytes)) 

文章来源: Convert str to numpy.ndarray