Forum : Photosynth Lounge

Photogrammetric, Oblique Image Stitching, Pets Dressed in Clothes Photos… this is a place to chat and share stories with your fellow Photosynthers. Not all topics have to be about photography, this is a place to relax and chat about whatever you fancy.


Topic: Combine existing photosynths?

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skywalker993 (Over 1 year ago)
I'm looking at the photosynth for the Keeper of the Plains statue in Wichita, KS, and I'm wondering if there's a way to connect some of the more distant as well as more close up images of the statue? I've seen it done with the Notre Dame Cathedral (where you can click on a smaller white square that represents a close-up photo) but photosynth didn't do it automatically for this statue. Can I combine them, or arrange them?
Nathanael (Over 1 year ago)
Here's the synth that Skywalker993 is talking about: 
http://photosynth.net/view.aspx?cid=c61ddabb-fb84-45f0-b940-4d6978decf34

As to your question, Skywalker, it's simply a matter of the computer vision's ability to recognize objects. If two shots are from too different an angle, Photosynth's algorithms simply can't make the jump. 

If you experience this with your own synths, you can simply go back out with your camera and take more pictures to show Photosynth how to get from one position to the next by taking photos walking from one spot to the next.

Another problem that Photosynth has is that it has a really hard time recognizing shots from the same angle if the subject takes up more than twice the percentage in one of the photos as it takes up in the next closest photo.

There's no way to manually combine two different synths as of yet. Neither is there a way to manually arrange different groups within a single synth that didn't automatically connect.
Nathanael (Over 1 year ago)
There are plans to have synths of the same location link together automatically, but I don't know whether that applies to putting the fractured pieces of a single synth back together or not.

If you switch to Grid Mode (use the second icon from the right and choose 'Images' - or alternately just press the tilde key after clicking the synth with your mouse - the tilde key looks like this [~] ) you can easily see which images Photosynth was able to link together by the groups that they appear in within Grid Mode.

The smallest images at the bottom of Grid mode are ones that didn't match any other images.

Looking at the % synthy score of a synth will give you a good idea of what percentage of the photos matched each other. For example, in a synth with more than 100 photos, one or two photos might not match but if all the others do, the synth will still receive a score of 100% synthy because each photo now counts for less than 1% of the total number of photos.
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