java websocket传json,使用WebSocket将图像作为字节发送JSON

I want to send and receive image from cv2.Videocapture using WebSocket.

It could get json, but it couldn't decoded.

We need result that can be opened using cv2.imshow().

Somebody help me...

This is Client

ret, image_np = cap.read()

IMAGE_SHAPE = image_np.shape

encoded_image = base64.b64encode(image_np)

print(type(encoded_image))

payload = {

'from': 'rasp',

'image': str(encoded_image),

'shape': IMAGE_SHAPE,

}

data = json.dumps(payload)

try:

# Send encoded image data.

await websocket.send(data)

# receive server message

received_data = await websocket.recv()

print('< {}'.format(received_data))

# image = base64.b64decode(received_data)

# np_image = np.fromstring(image, dtype=np.uint8)

# source = np_image.reshape(IMAGE_SHAPE)

return websocket

except Exception:

print('WebSocket send or receive error.')

exit(1)

This is Server

async def server_on(websocket, path):

payload = {

'from': 'image-server',

# 'result': {

# # Default is null.

# 'isPerson': ,

# 'centerPoint': ,

# },

}

data = json.dumps(payload)

try:

payload = await websocket.recv()

receive_data = json.loads(payload)

# At this line doesnt work...

decoded_image = base64.b64decode(receive_data['image'])

image_np = np.fromstring(decoded_image, dtype=np.uint8)

source = image_np.reshape(receive_data['shape'])

await websocket.send(data)

except Exception:

websocket.close()

return

解决方案

In your Client I would say that you have an extra operation not needed.

Based on your latest comment, you might not need to use: str(encoded_image).

You could try to use: base64.encodestring(image_np) that will send you back a string container.

ret, image_np = cap.read()

IMAGE_SHAPE = image_np.shape

encoded_image = base64.encodestring(image_np)

print(type(encoded_image))

payload = {

'from': 'rasp',

'image': encoded_image.decode('utf-8'),

'shape': IMAGE_SHAPE,

}