On 8/27/17, Evert Vorster <evors...@gmail.com> wrote: > Hi there. > > The program's name is nona, and it is distributed in source code form with > Hugin. > http://hugin.sourceforge.net/docs/manual/Nona.html > > The source code and descritpions is available here: > http://hugin.sourceforge.net/docs/html/index.html > > I hope it helps?
How is one supposed to use it to change vignetting? > > On 27 August 2017 at 13:35, Paul B Mahol <one...@gmail.com> wrote: > >> On 8/27/17, Evert Vorster <evors...@gmail.com> wrote: >> > Hi there. >> >> Hi, >> >> > >> > I have asked this question on the ffmpeg-users list, but it's been oddly >> > quiet on this front. >> > >> > I am trying to create a ffmpeg command line that re-maps and stitches >> > together footage from the Samsung Gear 360 camera. The basic methodoly >> can >> > be applied to any 360 view camera. The reason I am doing this is that >> > the >> > software that is available to do this is closed source and extremely >> > expensive. For a hobbiest, this is a bad situation. >> > >> > First thing I do, is to load a specially crafted series of frames in >> Hugin, >> > and perfectly map the lenses. >> > Then I make the remap files that the ffmpeg remap filter uses with nona >> -c. >> > I hand craft a alpha map to do the blending between the lenses, and the >> > results are really good. >> > >> > Unfortunately I have a real problem with vignetting. >> > The vignette filter in ffmpeg seems to have some room for improvement. >> > In Ffmpeg there is only one variable, and the x,y center. This allows >> > for >> > only one type of vignetting correction with the "backward" option set. >> > >> > In Hugin (and the panotools) the lens is described with 3 variables, and >> an >> > x,y center. This enables the vignetting strength to be described as a >> > custom curve. >> > >> > If you are curious about the project, this is the github page, with >> > examples. >> > https://github.com/evertvorster/dualfisheye2equirectangular_ffmpeg_remap >> > There are example .pto files, that when loaded in Hugin show the lens >> > chataristics of the Samsung Gear 360 lenses, and some sample footage to >> > test on. >> > >> > How difficult would it be to port the panotools' vignetting correcting >> > filter into ffmpeg? >> >> How it is actually named? >> _______________________________________________ >> ffmpeg-devel mailing list >> ffmpeg-devel@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> > > > > -- > Evert Vorster > Isometrix Acquistion Superchief > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
