ros通过opencv获取图像并在窗口显示

#!/usr/bin/env python
# coding:utf-8

import cv2
import rospy
from sensor_msgs.msg import Image
from cv_bridge import CvBridge, CvBridgeError



def callback(data):

    # Capture frame-by-frame
    cv_img = bridge.imgmsg_to_cv2(data, "bgr8")
    frame = cv_img
    cv2.imshow('Processed Image', frame)
    cv2.waitKey(1)


if __name__ == '__main__':
    rospy.init_node('img_process_node', anonymous=True)
    bridge = CvBridge()
    rospy.Subscriber('/hand_camera/image_raw', Image, callback)
    rospy.spin()