I think that if you uses the subsampling option you can perform consecutive registrations of increasing accuracy with a smaller metric windows. in this way, you can maybe obtain similar results reducing the time.
Best regards Carlos El miércoles, 26 de noviembre de 2014 17:44:04 UTC+1, alobo escribió: > > After having used otbcli_FineRegistration quite a lot, > I have come to the conclusion that the Metric window defined by Metric > Radius X and > Metric Radius Y must be quite large, otherwise the calculated offset > values are prone > to be too local (it is easy to find sporious high correlations at > positions that are not geometrically correct if the window is over a > homogeneous area) and unrealistically variable. > > The problem is that the program is very slow for large Metric windows. > Neverthless, there is no reason why the metric window should be > positioned at every pixel. > FineRegistration could have "jumpX", jumpY" arguments so that the > metric is calculated > every jumpX and jumpY pixels, which would speed up computation a lot. > For example > > -erx 5 -ery 5 -mrx 121 -mry 121 -jumpx 31 -jumpy 31 > would be enough > The final > X and Y offset "images" would then be just interpolated. It is more > important a large mrx and mry > than having the values calculated at every pixel. > > This should not be hard to implement for someone knowing well the > code. I would be willing to intensively test the new implementation. > > Agus > -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
