[IPOL discuss] Lost sigma parameter in NL-means demo

[Miguel Colom]

Hi all,
I've noticed that the sigma parameter is lost (reset to 10) when the user
clicks in the image to select the first corner of the subimage, in the
NL-means demo.

This can be avoided with a slight modification of the code in params.html:

<%
selected = {2:'', 5:'', 10:'', 15:'', 20:'', 25:'', 30:'', 35:'', 40:''}
try:
   sigmaSel = int(sigma)
except TypeError:
   sigmaSel = 10
selected[int(sigmaSel)] = 'selected'
%>