title: How to train/use the HOGDescriptor class in OpenCV
body: <p>I have been looking into training/using OpenCV to attempt to detect human figures. I want to try training a HOG for my specific purposes and not use the provided getDefaultPeopleDetector function. I have been unable to find any usable documentation on the HOGDescriptor class.</p>
  
  <p>How do I train my own classifier for my own purposes?</p>