title: Detection of sharpness of a photo
body: <p>I'm looking for a framework helps detecting the sharpness of a photo. I have read <a href="https://stackoverflow.com/questions/7765810/is-there-a-way-to-detect-if-an-image-is-blurry">this post</a> which points to the methodology of doing so. But I'd rather work with a library than getting my hands dirty.</p>
  
  <p>In the documentation of Core Image Apple says:</p>
  
  <blockquote>
    <p>Core Image can analyze the quality of an image and provide a set of filters with optimal settings for adjusting such things as hue, contrast, and tone color, and for correcting for flash artifacts such as red eye. It does all this with one method call on your part.</p>
  </blockquote>
  
  <p>How can I do the 'analyze image quality' part? I'd love to see some example code. </p>