title: cv2 imwrite and german letters ("ä, ü, ö")
body: <p>I wrote a script to manipulate some pictures with <code>cv2</code> in python.<br>
  Now I need to save these files, but some of the filenames contain german letters  <code>("ä, ü, ö")</code>.<br>
  Unfortunately it seems the <code>cv2</code>function <code>imwrite()</code> can't handle this and writes the filenames as <strong>BÃ¶gen</strong> instead of <strong>Bögen</strong>.<br>
  I tried to convert the <code>pathname</code> to <code>UTF-8</code> and other encodings via</p>
  
  <pre><code>path.encode("utf-8")
  </code></pre>
  
  <p>but this just leads to a</p>
  
  <pre><code>"TypeError: bad argument type for built-in operation"
  </code></pre>
  
  <p>Has anyone any experience with problems like that?</p>