Remapping from fisheye to rectilinear projection doesn't work 1:1, see
http://wiki.panotools.org/Projection#Rectilinear_projection
You can load your fisheye image into hugin, set the output projection to
rectilinear and crop the area your interested in. An interesting
projection for you to try might be Panini or General Panini (see the
description in the same article).
Cheers,
Carl
ps.
http://hugin.sourceforge.net/tutorials/ is working for me. Did you try
searching the internet for "hugin tutorial"?
William Zhang wrote on 13.07.15 07:50: