title: Chinese encoding in python OpenCV(cv2) putText method
body: <p>For some reason, I need to put Chinese text in an cropped image. I have used the method "putText" in cv2 to achieve the goal.</p>
  
  <p>Here is the code I use:</p>
  
  <pre><code>cv2.putText(crop_img, u'中文字串'.encode('utf-8'), (200, 200), cv2.FONT_HERSHEY_PLAIN, 3.0, textColor, thickness=4)
  </code></pre>
  
  <p>However, all the characters shown in the image became "?". How do I solve the problem? Does cv2 support Chinese encoding?</p>