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In university we have cameras over some parts of the professors table which are directly projected on the screen. Works great without the the drawbacks of an ov

In university we have cameras over some parts of the professors table which are directly projected on the screen. Works great without the the drawbacks of an overhead projector.

deleted 13y ago
[deleted]
Crito 13y ago
I think that is probably the solution. I've seen somewhat similar systems that tried to be more technically advanced than that, but they always made things worse. Just a straight-up camera-feed to the projector would work great though. The advantage of these over overhead projectors would still be pretty small though (really only the being blinded and replacement bulbs issue), so you would need to ensure that the system is rock-solid reliable. If not, then you've just made it worse by making it more advanced.
- Steuard 13y ago
  Document cameras like this work very nicely, but there is one small downside I've noticed: their framerate tends not to be very good. That's usually not a problem at all, but I have a couple of physics demos where I roll things around on an overhead projector, and the document camera often can't keep up with quick motion. Simple analog light and shadows obviously have no issues with that at all.
- OoTLink 13y ago
  overhead projectors are a bit dimmer and can't make nearly as big (or uniform) an image as the document cameras can.
sean-duffy 13y ago
Exactly this, in university one of my professors in first term rather than using slides, printed his slides onto paper and put them under one of these cameras, visualisers as they're called. I found it much more engaging since he could easily annotate things and just get a blank sheet of paper if anything needed further explanation.
zokier 13y ago
When I attended lectures with such cameras (which was some years ago) they were pretty horribad. Low contrast, low framerate, and motion blur everywhere. Probably had tons of latency too.

In university we have cameras over some parts of the professors table which are directly projected on the screen. Works great without the the drawbacks of an overhead projector.

deleted 13y ago

[deleted]

Crito 13y ago

I think that is probably the solution. I've seen somewhat similar systems that tried to be more technically advanced than that, but they always made things worse. Just a straight-up camera-feed to the projector would work great though. The advantage of these over overhead projectors would still be pretty small though (really only the being blinded and replacement bulbs issue), so you would need to ensure that the system is rock-solid reliable. If not, then you've just made it worse by making it more advanced.

Steuard 13y ago
Document cameras like this work very nicely, but there is one small downside I've noticed: their framerate tends not to be very good. That's usually not a problem at all, but I have a couple of physics demos where I roll things around on an overhead projector, and the document camera often can't keep up with quick motion. Simple analog light and shadows obviously have no issues with that at all.
OoTLink 13y ago
overhead projectors are a bit dimmer and can't make nearly as big (or uniform) an image as the document cameras can.

sean-duffy 13y ago

Exactly this, in university one of my professors in first term rather than using slides, printed his slides onto paper and put them under one of these cameras, visualisers as they're called. I found it much more engaging since he could easily annotate things and just get a blank sheet of paper if anything needed further explanation.

zokier 13y ago

When I attended lectures with such cameras (which was some years ago) they were pretty horribad. Low contrast, low framerate, and motion blur everywhere. Probably had tons of latency too.