将str转换为numpy.ndarray [英] Convert str to numpy.ndarray

问题描述

我正在创建一个与opencv共享视频的系统，但是我遇到了问题. 我有一个服务器和一个客户端，但是当我向服务器发送信息时，必须为字节. 我发送了2件事:

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是一个booland框架，是数据视频，一个numpy.ndarray ret不是问题，而是框架: 我先将其转换为字符串，然后转换为字节:

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)

我现在想再次将一个帧转换为numpy.ndarray.

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

推荐答案

您的str(frame).encode()错误.如果将其打印到终端，则会发现它不是框架的数据.

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

另一种方法是使用tobytes()和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))

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