3 ms·
> confidently assert 2020-12-21 15:12 over, say, 2020-12-22 15:15 via shadows Not at all. By visual inspection you can see whether it's the morning or the aft
by enriquto 6y ago
> confidently assert 2020-12-21 15:12 over, say, 2020-12-22 15:15 via shadows
Not at all. By visual inspection you can see whether it's the morning or the afternoon (if you know the orientation of the landmarks). I guess by image processing you could get a precision of +- 1h maybe?
- w_t_payne 6y agoHow precise is a sundial? How high is the resolution of the camera? I'd imagine that on a bright sunny day with a high resolution camera showing clean sharp shadows, it'd be possible to get a precision much better than +/-1h.
- enriquto 6y agoSure, I was thinking about a photo of human subjects in the foreground, with some distant buildings in the background. But if you photograph the shadow of the Eiffel tower on a clear sunny day you may be down to the precision of a couple of minutes.
- Ntrails 6y agoBut that's only if you can resolve the "which day" issue?
- enriquto 6y agoOh, yes, that seems a hard problem. But with sufficient effort (cloud patterns, parked cars, other people in the image) there is still a lot of information to extract. Especially if other people were taking exim-tagged photos in the same time and place and putting them on instagram.
- deleted 6y ago[deleted]