title: how can i save my result of image using mask_rcnn
body: <p>I want to save only one part of the image that I used the mask_rcnn 
  For example, I want to extract only class of bag from test.jpg and get an image with only that bag by using python image crop, but the code is too complicated to know.</p>
  
  <pre><code># Load a random image from the images folder
  file_names = next(os.walk(IMAGE_DIR))[2]
  image = skimage.io.imread(os.path.join(IMAGE_DIR, "test2.jpg"))
  
  # Run detection
  results = model.detect([image], verbose=1)
  
  # Visualize results
  r = results[0]
  visualize.display_instances(image, r['rois'], r['masks'], r['class_ids'], 
                              class_names, r['scores'])
  </code></pre>
  
  <p>Print out and save an image with only a bag in the file named test.jpg. by using python crop</p>