title: Storing and verifying user signature
body: <p>I will be trying to recognize user signature, sever-side, written with a digital pen like this one. <a href="https://i.stack.imgur.com/FGm8N.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FGm8N.png" alt="enter image description here" /></a></p>
  <p>I have absolutely no experience working with a digital pad like this and the pads aren't cheap to just &quot;try buying and see&quot;. What would be a good approach to store and verify the user signature generated by a pad like this?</p>
  <ol>
  <li><p>I have found the question <a href="https://stackoverflow.com/questions/13109435/handwritten-signature-comparison">Handwritten signature comparison</a> but the answer provided seems to deal with recognizing handwritten letters, rather than working with a user signature.</p>
  </li>
  <li><p><a href="http://answers.opencv.org/question/28291/signature-verification/" rel="nofollow noreferrer">Signature Verification on OpenCV Forum</a> and <a href="https://stackoverflow.com/questions/26784752/hand-written-custom-shapes-recognition">hand-written custom shapes recognition</a> only suggest that this is a difficult task.</p>
  </li>
  </ol>
  <p>Is this an unusual task that i am trying to achieve and the pads like these are used only as a tool for storing the signature in a meaningful way in a database? If so, is it a standard to store the data as a bitmap or are signatures stored as a sequence of vectors?</p>
  <p>If someone has any experience working with pads like these, any help would be appreciated.</p>