that you’re able to zoom in and see 4000-6000 year old tooling marks just enhances the experience immeasurably. Photosynth is also quite useful as an online Powerpoint Presentation, but with zoom as demonstrated here:
The fact that you can see the rock art in different lighting conditions on the same synth is fantastic too (oblique lighting is best).
I could go on about potential for heritage, but I best stop now
Hello K, firstly apologies to Artnowex for cluttering up his comments page & then to you all for waffling on a bit:
I’m not quite sure what you mean by coverage, but if your talking about coverage with photography, then you’re not going to improve on the PS Photography Guide. Even though our project http://archaeologydataservice.ac.uk/era/
has pushed the boundaries for recording rock art using photogrammetry, the photography element is still fairly complex - having to think about each shot as a pair, optimal ratios between subject, and movement between base imagery + calibration etc it can be bloody awkward… On Photosynth = take you camera, take a shot, move slightly….wonderful. Admittedly, you’re not going to achieve the millimetre and sub-millimetre accuracies of photogrammetry and laser-scanning, but Photosynth certainly fulfils so many other needs, some of which you’ve stated. One of the biggest advantages is – surprise - the zooming capabilities, the fact t
PGRic that sounds really interesting. I'd seen a couple of your synths but hadn't read your profile. Maybe you can give us all some tips on how to get great coverage. Have you found Photosynth to be useful in recording rock art? I think it would shine at capturing the surroundings so you could see everything from the field level to the macro shots of the rock itself.
Photosynth does compute the actual camera position so in theory we could glean the shooting distance from data we already have. We're not doing that now though so I guess it doesn't answer your question.
K, it looks ammonite-ish.
It would be interesting to know about focal distance given the numbers of photographs & point cloud density. For the past few years I've been involved in a volunteer project that helped develop close range photogrammetric techniques for recording prehistoric rock art. We could regularly turn out accuracies of 2mm surfaces with little data noise (1 – 1.5 metre focal distance), but a few volunteers pushed the camera calibration by getting really close (25cm) & as a result 0.5mm mesh were achieved. Worth a few tests me thinks...off I trot to find the camera :)
Good question PGRic - what's the scale of this item? and what is it?
by the way, if you rotate the images before synthing they'll look better in 2D mode.