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Problem viewing images using python-opencv

I have trouble viewing color images from R200 realsense camera using the python-opencv interface. The window is blank when I run this script. When I comment out'cv2.namedWindow("Image window", 1)', it shows the first image.


import roslib import sys import rospy import cv2 from std_msgs.msg import String from geometry_msgs.msg import Twist from sensor_msgs.msg import Image from rospy.numpy_msg import numpy_msg

from rospy_tutorials.msg import Floats

from cv_bridge import CvBridge, CvBridgeError import numpy as np import math; import cv2;

import matplotlib.pyplot as plt;

import sys;

import caffe;

import socket;

from sklearn import datasets;

import subprocess;

import message_filters from rospy.numpy_msg import numpy_msg import time


import os.path

class image_converter:

Initializing variables, publishers and subscribers

def __init__(self): print 'show window' cv2.namedWindow("Image window", 1)

print 'start bridge and subscribe'

self.bridge = CvBridge()

self.image_sub = rospy.Subscriber("/camera/rgb/image_color", Image, self.callback)

# The main callback that processes the color and depth data.
def callback(self,color):

start = time.time()
# acquiring color and depth data (from ROS-python tutorial)

  frame = self.bridge.imgmsg_to_cv2(color, "bgr8")
except CvBridgeError, e:
  print e

frame = np.array(frame, dtype=np.uint8)

cv2.imshow("Image window", frame)
print 'test'

def main(args): ic = image_converter() rospy.init_node('image_converter', anonymous=True) try: rospy.spin() except KeyboardInterrupt: print "Shutting down" cv2.destroyAllWindows()

if __name__ == '__main__': main(sys.argv)