DMK23UX174 OR DMK23UX236?

[gkrywusha]

Hi all,

I've read quite a bit here on the DMK23UX174 and it does seem like a nice camera. However, for a limited budget, well, it's expensive. Then I looked at the Growshapes page on the new David 4 Cam...

http://www.growshapes.com/store/p58/Upg ... amera.html

Going by these specs, the camera is almost an exact copy (in specs) as the DMKUX236. Yes, originally the comments were always that Global Shutters were better than Rolling. But the David 4 Cam is a Rolling Shutter.

The reason I ask is the DMKUX236 is less than half the cost of the DMKUX174. If this camera is extremely close to the David 4 Cam, this is financially doable.

Any thoughts on this?

Greg K.

[micr0]

Every now and then I used to get a scan that had weird distortion in it and I thought at the time it was because I was using a camera with a rolling shutter. Since I got the 174 I haven't seen the problem. I never proved it empirically though so it may have been something else entirely. Perhaps David has added code to the new software that compensated for this phenomenon? It may also not be such an issue with the faster frame rate? I bought my camera from AV supply and they have a 30 day return policy. So you could get the 236 and try it, and if it didn't work to your liking, you could exchange it toward the 174. FWIW after tweaking the frame rates on the projector side, I'm able to get a complete scan of 22 patterns in just about 2 seconds

[gkrywusha]

Thanks for the response!

I too buy from AVSupply (although OEM cameras is showing $10 less on the 236). I'm using the 021 right now and it works quite well. I run a Pi turntable taking 12 scans on full rotation and take about 6 seconds for a single "quality" scan.

I'm thinking of giving the 236 a try. I probably have to look into a replacement lens too. Hopefully we can find something comparable close as well.

Greg

[Curiousjeff]

Hi Micr0,

I am trying to get a scan in seconds like you, but I really don't know how you do it.

The best I could get was 6 seconds (patterns only) with 22 patterns un FullHD at 60 fps.

Could you give some more details how you get this speed ?

I have been asked to make a presentation in front of Doctors. I will need to scan parts of people and thus speed is important to avoid movement.

Thanks,
Jeff

[gkrywusha]

Hey there,

Maybe you misunderstood my response. I'm testing David 5 with my 021. Even with manual turning at Horizontal turns (31 patterns), it takes around 5 secs. at only 30fps due to my secondary system not having 3.0 ports. Still, with David's new technology, I find I can drop from 30 degree scans to 60 degree scans with better quality and alignment. This means, roughly as it's manual, scanning takes 30-40 secs. for 360 degrees in total due to my manual dexterity getting in the way.

After that David takes (with Free alignment using surface texture) a few minutes to fully align. This is now automated to go through coarse and fine alignment. I can't even tell you how much time this has save me.

I can only see further quality by adding a second camera to add a different scanning angle for those spots that normally need multi scans later.

[Curiousjeff]

I was refering to Micr0 message above (that's why I wrote "Hi Micr0 )

Micr0 wrote:

"FWIW after tweaking the frame rates on the projector side, I'm able to get a complete scan of 22 patterns in just about 2 seconds"

I can "only" get 5 seconds.