Forum : Mobile Photosynth

Share tips for making and sharing amazing panoramas from your phone.


Topic: Black areas on top and bottom on exported JPG's

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C360 (Over 1 year ago)
When I export my panorama's made on my iPhone to JPG's the program ads black, skewed, lines on top and bottom. When viewing these images with another viewer interactively again this results in small black hearts in the zenith an nadir!
Nathanael (Over 1 year ago)
C360, this sounds like the two panorama viewers are just using different projection methods. 

I assume that you are saying that you have shot full spherical panoramas with the app with no empty space when viewed in Photosynth's viewers? 

Do you have a link to a full resolution copy of one of your flattened out mobile panos? I'd like to feed it to this HDView Preview page to see whether HDView reprojects it correctly.
http://research.microsoft.com/en-us/um/redmond/groups/ivm/hdview/preview/default.html
C360 (Over 1 year ago)
Hi Nathanael,

Thanks for your reply, I did'n get a notification though hence my late reaction.

You can see the exported (equirectangular) image here.

http://c360.nl/loose/Zwaentjeshof_2_okt_2011.JPG

It comes straight out the PhotoSynth app. You can clearly see the black areas on the top and bottom. They display as little hearts when viewed through any panoramic projection. It is clearly not an issue of the viewers because any image exported by PhotoSynth  on my iPhone shows the black lines.

No big issue, just a little strange, perhaps a 'loving' developer put in the hearts!
Nathanael (Over 1 year ago)
Heheh. ツ I wasn't contradicting that the output image had empty space outside the stitch. I just thought that perhaps if the flattened version was ever even intended for reprojection (which I suspect it wasn't) perhaps the corners were meant to overlap each other a bit. More likely is that the flattened version of the pano is simply meant to be viewed as flat and as such takes a bit of liberty with the lens distortion to give the most acceptable flat image.

Is it possible for you to also upload that panorama to your Photosynth account? I'd like to see what the cube map version of the pano looks like in Photosnth's own web viewer.

If you don't get an answer here, you could try running your question past the ICE team at Microsoft Research, since I believe they were behind the stitching engine of the mobile pano app. Here's their forums: http://social.microsoft.com/forums/en-US/ice/threads and their Twitter account: http://twitter.com/microsoftice
C360 (Over 1 year ago)
Hi Nathanael,

Thanks for the quick reply!

I just uploaded it from the app, as you can see there is nothing to be seen on top and bottom, no black hearts at least ;-)

I don't think is is a choice to lessen the distortion as it really doesn't do much difference on the top or bottom parts of an equi.

I'll post in the ICE team site as well, thanks for the suggenstion.

Henri
C360 (Over 1 year ago)
Hmmm, Sliverlight just asked me to be updated (MaxOSX) and I dutyfully complied. Now I cannot view the photosynths anymore, I just get a still where I can zoom in-out with the scroll wheel but I'm unable to drag/look around!

Sjeez!
Nathanael (Over 1 year ago)
Could you please visit http://microsoft.com/getsilverlight/ and tell me what version of Silverlight you currently have installed? 

I'd like to try to duplicate the error you're having on my iMac. Also, I'm still running Snow Leopard. Are you on Lion?
SignalToNoise (Over 1 year ago)
Hi,
I am Denis, developer on the mobile Photosynth app.
Full shot spherical flat projection have indeed a few missing black pixels near the poles. That's due to our projection method with OpenGL. I did not anticipate that those flat panos could be loaded other viewers. Photosynth's immersive version is fine.
I am working on an update that will fix the issue.
Thanks,

Denis
C360 (Over 1 year ago)
Hi Nathanael,

Installed version: Silverlight 4 (4.0.51204.0)
Current version: Silverlight 4 (4.0.60531.0)

I'll upgrade again and see what happens, I'm using Snow Leopard 10.6.8 

Thanks for looking into this Denis!! I'm indeed using the Equi's in viewers like PangeaVR Pro and iPano. maybe there could be an export option from Photosynth app directly to those viewers' directory, just a thought!
C360 (Over 1 year ago)
Hmmm, I just noticed the lack of control only happens when the Synth is displayed on my externally connected monitor (a 20" Dell), op my 15" MacBook screen it functions normally!
C360 (Over 1 year ago)
By the way, nice 'meeting' you Denis, and thank you for a great app. Gives me the opportunity to shoot pano's everywhere even when I'm not carrying my pro-gear!

I would really like direct embedding in Facebook instead of sharing a link ;-)

Feel free to have a look at C360.NL

Henri
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