Forum : Advice & Critiques

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Topic: stitching the end of the 360

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SDI (Over 1 year ago)
For some reason I can't get the end to stitch to the beginning good. I tried making the last frame overlap the first, leaving a gap, etc. Help!
Nathanael.Lawrence (Over 1 year ago)
Hi, SDI. Sorry to hear of your troubles.

I took a quick look at the two public panos posted on your profile and I see the gap in this one: 
http://iphotosynth.cloudapp.net/ViewHandler.aspx?cid=b471b7b3-c1bc-4ab4-90a7-f1ccbf38f820&m=false&i=0:0:0&c=0:0:0&z=445.047745278144&d=-1.21689759476032:1.30678801835276:1.23109350584565&p=0:0&t=False

...but this one seems to have succeeded in stitching a full 360°: 
http://iphotosynth.cloudapp.net/ViewHandler.aspx?cid=2e4ef1d6-1853-49cf-b480-2033ebad413d

I don't have experience with the mobile app, but one thing that is important for any panorama is that the camera's lens stay as close as possible to the same point in the air as it looks all around. This will make it much easier for any panoramic stitching software to line everything up. If this is something that you haven't tried yet, give it a shot and let us know how it goes.

More tips in this weblog entry: http://styleisviolence.com/photosynth-app/
SDI (Over 1 year ago)
thanks i'll try again.
you probably can't tell but where it stiched the end to the beginning it messes up the hallway.

great progam though, a lot of fun!
dhaines (Over 1 year ago)
I'm having the same problem, either it leaves a gap or it overlaps the ends.  see 
http://photosynth.net/view.aspx?cid=01d20a33-6ed9-48ce-81bd-59120f9376ac&m=false&i=0:0:0&c=0:0:0&z=504.691323217599&d=-1.55357162399228:-1.55357162399228:-0.942334113103773&p=0:0&t=False 
for an example of the overlap.  When I process just the error of the error, it works great.  But when I try to do the whole pano, it doesn't.  Any suggestions on trying the right photos?
dhaines (Over 1 year ago)
Just adding some info after some research and experiments.  

1)  Your best bet is to make the "stitch" on a background subject. Don't do your stitch on a foreground subject.  It's to easy to get the camera out of place and thus confuse the stitching.  On foreground subjects the camera placements matters more, hence rule #2.

2)  Rotate the camera, not you,  this in practice is really hard.  You should keep the lens (ideal the image chip in the camera) in the same location.   This isn't so important when your subject is far away, but for close objects, the focal point of the lens must remain and stationary as possible.  Bend your fingers and wrists, but not your arms or body.

3) Free software can only do so much!
Nathanael (Over 1 year ago)
Yep. This echoes the recent entry on the Photosynth blog very nicely: 
http://blogs.msdn.com/photosynth/archive/2011/05/30/introducing-the-quot-mastering-the-photosynth-app-quot-video-series.aspx

The limit with all panorama stitching software has been that it simply tries to line the different images up and blend the lighting, but if each photo was taken from slightly different points of view, then foreground objects simply do not line up the same in the different photos that the panorama stitching is trying to line up. This means that the panorama stitcher either locks on to the foreground or locks onto the background and (if you've moved your camera's sensor between shots) then whatever the stitching software gives up on lining up will come out wrong. You can look at this as either a limitation in panorama stitching software or you can accept it and learn to shoot panoramas correctly - keeping the camera's imaging mechanism stationary while rotating.
Nathanael (Over 1 year ago)
For overcoming this limitation (stationary camera) of all panorama software, try making photosynths, rather than panoramas. The Photosynth website does host both types of photography, but the only way to currently create photosynths is with the Windows app. 

You can use a Photoshop plugin or Microsoft Research's ICE panorama stitcher on Windows or the Photosynth mobile panorama app to upload panoramas, but only Windows has an app to make photosynths.

To make a good synth, instead of a panorama, it is actually very important to move the camera all around your subject. For lots more detail, try this discussion: http://bit.ly/sinkorsynth
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