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Synths focusing too much on clouds
I have photos of constructions projects I work on and they tend to be taken on cloudy days. I have noticed that my synths don't work because the clouds and sky primarily get synthed more than the foreground. Naturally, if I move around, the clouds won't move much in frame because of how far they are. So the result is that the sky is matching points rather than the ground. How can I avoid this on outdoor photos?
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Inappropriate?I've never heard of this before, can you share a link to your synths?
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Inappropriate?Ken I can verify this as well but I've deleted all but one such example (a subset of aerial photos within an attempted synth of a bunch of random shots of the basketball courts in my old neighborhood) and it is due to having far too few aerial photos to tie together. When I simply threw all of the aerial photos of the entire campus together those same photos locked onto ground features with none of the cloud problem. -
Inappropriate?Thanks for taking my question, Ken. The following is a bridge pier that we designed for a bridge under construction in Orlando. Several pictures were taken at varous angles and distances away from the pier. As you can see, the clouds line up flawlessly, but the foreground appears to jump around. In some photos, the camera locations were around 20 feet apart, yet there appears to be no movement in location while viewing in the program. Therefore, there is no real perception of depth in the synth. Is it possible that the clouds' displacement in the photos are too small relative to the pier, crane, etc., that the program does not identify any shift in camera origin in space?
http://photosynth.net/view.aspx?cid=e... -
Inappropriate?I'm afraid the the computer vision technology inside Photosynth isn't "intelligent" enough to distinguish between non-rigid structures like moving clouds (which shouldn't get matched) and rigid structures like the ground.
I would suggest either shooting your images with less sky showing, or editing your images and painting out the sky (a big blur brush or blue brush should probably do the trick).
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Inappropriate?Rick, based on David Gedye's explanation of how the order that images are given to Photosynth affects the final outcome, and your suggestion to shoot photos with less sky in them, would it be good logic to expect that if a good panorama and suitably incremental zoom shots of some distant details (all with a minimum of sky) are the first photos added to the synther, that they will create a solid enough framework and emphasis on terra firma details to get the shots with plenty of sky in them to focus on the ground?
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