nction [H,Ip] = imagesAlign( I, Iref, varargin ) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Fast and robust estimation of homography relating two images.

 The algorithm for image alignment is a simple but effective variant of
 the inverse compositional algorithm. For a thorough overview, see:
   &quot;Lucas-kanade 20 years on A unifying framework,&quot;
   S. Baker and I. M