 the program may need to be "transposed" as
in:</p>

<precode type='matlab'>
[r,f] = vl_mser(I) ;
f = vl_ertr(f) ;
</precode>

<p>On the other hand, the region seeds <code>r</code> are already in
row major format, which is the standard MATLAB format for pixel
indices.</p>

<p>Instead of transposing the frames, one can start by transposing
the image. In this case, the frames <code>f</code> have the standard
image convention, but the region seeds are in column-major format and
may need to be "transposed" as i