title: ImportError: No module named opencv after installing python-opencv
body: <p>I install opencv in python with running <code>$ sudo apt-get install python-opencv</code> and installed successfully. but when run this code</p>
  
  <pre><code>import opencv
  import opencv.highgui
  import time
  import commands
  
  def get_image():
      image = opencv.highgui.cvQueryFrame(camera)
      return opencv.adaptors.Ipl2PIL(image)
  
  camera = opencv.highgui.cvCreateCameraCapture(-1)
  
  while 1:
      image = get_image()
      image.thumbnail((32, 24, ))
      image = tuple(ord(i) for i in image.tostring())
      x = int((int((max(image) / 256.0) * 10) + 1) ** 0.5 / 3 * 10)
      cmd = ("sudo su -c 'echo " + str(x) +
          " &gt; /sys/devices/virtual/backlight/acpi_video0/brightness'")
      status, output = commands.getstatusoutput(cmd)
      assert status is 0
  </code></pre>
  
  <p>Got follow error</p>
  
  <pre><code>$ python bright.py 
  Traceback (most recent call last):
    File "bright.py", line 1, in &lt;module&gt;
      import opencv
  ImportError: No module named opencv
  </code></pre>
  
  <p>Could you please help me?</p>