Problem viewing images using opencv

[pnambiar]

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.

-P

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)
try:
  
  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'
cv2.waitKey(0)

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)

[pirobot]

Hi pnambiar. I don't have an R200 camera to test so I would suggest posting your question on http://answers.ros.org. Be sure to include the version of ROS and Ubuntu you are using.