title: how to show the image after I use Image.fromarry() on the pyqt4
body: <p>I use cv2 and pil module to edit a image</p>
  
  <pre><code>image =  cv2.medianBlur(img_gray, 7)
  image = Image.fromarray(image)
  </code></pre>
  
  <p>how can I show the image on the pyqt4?</p>