Thanks for sharing your final recipe! About manual CPs, you probably already do them well, but a good tip is to put them away from each other not letting any big part of the joining parts without any. As I said, I sometimes do only 3 between each pair and they are put one at the top, one at the middle and the last at the bottom of the image, whenever this is possible.
Cheers, Carlos E G Carvalho (Cartola) http://cartola.org/360 2012/1/30 torger <[email protected]> > I appriciate the helpfullness, but unfortunately I cannot share the > images since the originals are not mine. > > However, I worked this evening with this on a few images and tested > several methods and have great help of your input. I get good results > now (often subpixel fits), and consistent enough. > > The interesting fact is that setting a 1 - 2 degrees FOV is required > for the best results. I've tried to let Hugin optimize it by itself > but it rarely goes down to those low values, even when starting with > the calculated 5.42 degrees. The fit often gets kind of ok with that > 5.42 starting point, but not as good as it can get. I suspect that > this is a special case occuring for this type of repro setup when > there are just minor but still some yaw/pitch errors. Almost perfect > perpendicular, but not 100% as a flatbed scanner, and not as large as > hand held mosaics of walls. Seems to fall outside normal optimization > space. > > I've also tested auto control points, and it works kind of ok, but > there's always some outliers so I think I continue do them manually, > having relatively few points and well-defined places gives me a better > overview of stitching result I think, but I guess it is a matter of > taste. > > I normally don't pre-correct lens distortion, since Hugin indeed does > better fitting result if it can correct barrel etc itself, but in this > special case the optimizer easily goes haywire so having close to > perfect rectilinear input seems to work better. I've also tried to pre- > correct roll, but it is not really worth it, that correction works > well. > > This is the hugin workflow that gives me consistent results so far for > this application: > > * Create new project > * Open the 16 bit tiff images (usually four) > * Don't use the field of view from EXIF, instead pre-set to 1 degree. > * Make control points to connect all images > * Make horizontal (and possibly also vertical) guides on all images > * You should have included film edge on all your frames and that is > what you use as guide > * Now the exciting part - the optimizer tab > * First correct X and Y for all but one > * Then add roll to all and optimize again > * Theoretically this would yield perfect result already here, > but as > said the repro setup is rarely that perfect > * Then add Z for all but one and yaw and pitch for all, and > optimize > again > * Then open up GL preview, goto move/drag and select drag > mode "mosaic", and then drag the image into the center of the > view, > close and optimize again > * Typically the optimizer has put the image far from center, > and > moving it back into the middle again and reoptimizing can > give > better result. > * You can try to add lens view as a final parameter but that > usually > does not improve things. > * Open up GL preview > * Choose rectilinear projection > * Mosaic-drag so the center is in the center of the image > * Fit/autocrop the view > * Stitch to 16 bit tiff output, for further processing in your > favourite raw converter or photo editor > > On Jan 30, 7:08 pm, "Carlos Eduardo G. Carvalho (Cartola)" > <[email protected]> wrote: > > Well, I did mosaic maybe only a couple of times, but I didn't remember > > having difficulties. I wouldn't do lens correction before hugin and I > > wouldn't think of doing so much precise controls. Maybe with macro they > are > > more important, but I really don't know. Manual CP are surely not a > > problem, just make sure you use at least 3 between each pair. Many times > I > > use only 3 (but to do spheric panoramas). Can't you give us an example > > image set? Could be reduced size jpg preferably without any previous > > processing, like that lens correction you mentioned. > > > > Is FoV so much important? Many times I just put a reasonable value and > let > > the optimizer correct this. More important is to guarantee that it won't > > think it is a 360ยบ panorama, so I would think any kick to guarantee that > > the total FoV is not going to get to 360 would be a good start, but > again, > > "guessing" here looks to me like a little loose of time if compared to > see > > your images to address the real problem. > > > > Cheers, > > > > Carlos E G Carvalho (Cartola)http://cartola.org/360 > > > > 2012/1/30 torger <[email protected]> > > > > > > > > > > > > > > > > > Sorry for spamming... just came to think about FoV. Macro lenses are a > > > bit special, fov doesn't match focal length at near limit. My 150mm > > > macro lens from the focal length says "13.69 degrees fov". But at 1:1 > > > distance is 380mm so the fov would then be 2 * arctan(36/2 / 380) = > > > 5.42 degrees, that is about the same as a 380mm lens. Anyway, I'll do > > > some more experiments and report about the results. > > > > > -- > > > 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 [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > >http://groups.google.com/group/hugin-ptx > > -- > 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 [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/hugin-ptx > -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. 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