Question

我试图从io.BytesIO（）结构加载带有OPENCV的图像。最初，代码使用PIL加载图像，如下所示：

image_stream = io.BytesIO()
image_stream.write(connection.read(image_len))
image_stream.seek(0)
image = Image.open(image_stream)
print('Image is %dx%d' % image.size)

我尝试用这样的OPENCV打开：

image_stream = io.BytesIO()
image_stream.write(connection.read(image_len))
image_stream.seek(0)
img = cv2.imread(image_stream,0)
cv2.imshow('image',img)

但似乎imread并不处理BytesIO（）。我收到错误。

我使用OPENCV 3.3和Python 2.7。拜托，有人可以帮助我吗？

Answer 1

Henrique的试试这个：

import numpy as np
import cv2 as cv

image_stream = io.BytesIO()
image_stream.write(connection.read(image_len))
image_stream.seek(0)
file_bytes = np.asarray(bytearray(img_stream.read()), dtype=np.uint8)
img = cv.imdecode(file_bytes, cv.IMREAD_COLOR)

Answer 2

arrybn给出的答案对我有用。只需在cv2.imshow之后添加cv2.waitkey（1）。这是代码：

服务器端：

import io
import socket
import struct
import cv2
import numpy as np

server_socket = socket.socket()
server_socket.bind(('0.0.0.0', 8000))
server_socket.listen(0)

connection = server_socket.accept()[0].makefile('rb')
cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
try:
    while True:
        image_len = struct.unpack('<L', connection.read(struct.calcsize('<L')))[0]
        if not image_len:
            break
        image_stream = io.BytesIO()
        image_stream.write(connection.read(image_len))
        image_stream.seek(0)
        file_bytes = np.asarray(bytearray(image_stream.read()), dtype=np.uint8)
        img = cv2.imdecode(file_bytes, cv2.IMREAD_COLOR)
        cv2.imshow("Image", img)
        cv2.waitKey(1)
finally:
    connection.close()
    server_socket.close()

基于示例Capturing to a network stream

使用opencv加载BytesIO映像

2 个答案: