Hi Bruno, at last I understand Panini -- thanks for that. I guess that in the same way that stereographic can be generalised to have the projection point anywhere within the sphere, Panini can be generalised to have a projection point anywhere within the cylinder -- I'll have a look at that next.
Best wishes, Peter. From: Bruno Postle <br...@postle.net> Subject: [hugin-ptx] Re: Generalised stereographic projections Date: Thu, 26 Feb 2009 20:51:53 +0000 > > On Wed 25-Feb-2009 at 14:53 +0000, Peter Gawthrop wrote: > > > > I have been playing with generalisations of the stereographic > > projection. Given a "view sphere" of a 360 panorama, the basic idea > > is the float around inside that sphere and then project on to either > > a plane or a cylinder. Conventional perspective comes from > > projecting from the centre of the sphere, and stereographic from the > > back, onto a plane. > > I never really got around to describing the panini projection, but > basically it is set out exactly the same as stereographic except > using an intermediate cylinder instead of a sphere. > > e.g. a stereographic image is what you would get by sitting at the > back row of a planetarium and photographing the ceiling with a > 'normal' camera. > > ..and a panini image is what you get if you photographed inside a > Victorian painted cylinder panorama, but stood as far from the > centre as possible with your back against the wall. This goes some > way towards explaining why these painted panoramas don't get any > better if you stand in the dead-centre (and an extreme example of > Zeeman's Paradox). > > > At the moment, it's a mathmap implementation. But I would like to > > think about putting it in hugin and/or panini. Note that, unlike the > > Panini projection, the aim is to distort - albeit in a meaningful way. > > I still can't get Tom's Panini to run (wrong version of QT on EL4, > grr), but as I understand this is more or less how it currently > works. > > -- > Bruno > > > > > ______________________________________________ > This email has been scanned by Netintelligence > http://www.netintelligence.com/email > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx -~----------~----~----~----~------~----~------~--~---
