l_mser</a></code> uses
matrix indices as image coordinates. Compared to the usual MATLAB
convention for images, this means that the <code/>x</code>
and <code/>y</code> axis are swapped (this has been done to make the
convention consistent with images with three or more dimensions). Thus
the frames computed by the program may need to be &quot;transposed&quot; as
in:</p>

<div class="highlight"><pre><span class="p">[</span><span class="n">r</span><span class="p">,</span><span class="n">f</span><span class="p"