4K projector and suitable cameras for it

Write here about construction, ideas, equipment, tips n tricks etc. related to structured light scanning
Post Reply
Proforg
Posts: 4
Joined: 15 Apr 2021, 17:24

4K projector and suitable cameras for it

Post by Proforg »

Hi, I'm considering the first SLS setup for scanning fingernails (150x200x20 mm zone) with high precision
I've found quite attractive offer from TI (4K projector for $1K) https://www.ti.com/tool/DLPDLCR471TPEVM
And thinking about suitable cameras for such kind of setup. Do you have any considerations?
The goal is to get 0.01mm accuracy for scanning, but I understand that it could require quite a lot of work and software development
NARMELLA

Re: 4K projector and suitable cameras for it

Post by NARMELLA »

Proforg wrote: 14 May 2021, 13:06 Hi, I'm considering the first SLS setup for scanning fingernails (150x200x20 mm zone) with high precision
I've found quite attractive offer from TI (4K projector for $1K) https://www.ti.com/tool/DLPDLCR471TPEVM
And thinking about suitable cameras for such kind of setup. Do you have any considerations?
The goal is to get 0.01mm accuracy for scanning, but I understand that it could require quite a lot of work and software development
.
For what you expect , It depends on whether the timing of a shot is important to you or not.

If NOT ; dslr cameras are good. ( canon , nikon ...) And of course you will not need a special software and its development.

Approximate time for one shot : 20 s.
MIN hardware req for processing :
Os : win10 64bit
Cpu : core i7
Ram : 64gb

Graphic card : nvidia quadro

And to achieve the accuracy you want : a good calibration pannel and a good calibration.

And finally the big challenge is the light reflection and controlling by using the color of light and special lenses.

Good luck

Narmella
Proforg
Posts: 4
Joined: 15 Apr 2021, 17:24

Re: 4K projector and suitable cameras for it

Post by Proforg »

I'm trying to choose between Daheng IMX183 (20mp, 19fps, 1", mono) and IMX226 (12mp, 32fps, 1/1.7", mono) cameras. DSLR+lens for the same resolution looks like not the best option for the same price (with low distortion lens)
I fully understand that the processing will require the bunch of resources, so the system requirements are ok
Thank you for your effort
mading
Posts: 262
Joined: 31 Jan 2017, 13:09

Re: 4K projector and suitable cameras for it

Post by mading »

Accuracy is related to resolution, which depends on tb dimension of the field of view, the camera and projector resolution, errors etc..
If your field of view is 10 mm, an HD camera divide it roughly in 2000. So your resolution is 0.005 mm. But that's not accuracy.
Thanks for the projector link.
As far as I know, please consider that this projector is a 1920x1080 micro mirror device that is rated as 4k with a trick I can't explain since I do not understand.

Which software are you going to use? Hp3d?
HP 3D scan, LG PF50, LG PF1500 David Calibration panels, Melamine panels, DIY rotary table. RangeVision DIY: 2x DahengMer630, 2X12 and 2X16 mm 5Mp ZK lenses, RV turntable
mading
Posts: 262
Joined: 31 Jan 2017, 13:09

Re: 4K projector and suitable cameras for it

Post by mading »

https://www.ti.com/product/DLP471TP

See the specs.
What I find interesting is the high frame rate at 1920x1080 (240hz).
That would be nice if you can sinc with global shutter cameras at 120 Hz with a software such as flexscan.

I don't think it's a 4k monochrome projector, but it's a full HD good one.
HP 3D scan, LG PF50, LG PF1500 David Calibration panels, Melamine panels, DIY rotary table. RangeVision DIY: 2x DahengMer630, 2X12 and 2X16 mm 5Mp ZK lenses, RV turntable
Proforg
Posts: 4
Joined: 15 Apr 2021, 17:24

Re: 4K projector and suitable cameras for it

Post by Proforg »

According to the specs it can go up to 60Hz at 4K. I can hardly see any evidence that 4K is not the native resolution
I'm not sure about the software now, but will definitely try well-known packages
mading
Posts: 262
Joined: 31 Jan 2017, 13:09

Re: 4K projector and suitable cameras for it

Post by mading »

Proforg wrote: 14 May 2021, 20:44 According to the specs it can go up to 60Hz at 4K. I can hardly see any evidence that 4K is not the native resolution
I'm not sure about the software now, but will definitely try well-known packages
I would take a look at it:
https://www.projectorjunkies.com/4k-dlp ... planation/


As I read in the article, true 0.66" dmd with resolution 2716X1528 are available:
https://www.ti.com/product/DLP660TE

but it's not the dmd used by the example you mentioned in this post.

Edit: I found an evaluation board, still a bit expensive..
https://www.keynotephotonics.com/produc ... nt-system/
HP 3D scan, LG PF50, LG PF1500 David Calibration panels, Melamine panels, DIY rotary table. RangeVision DIY: 2x DahengMer630, 2X12 and 2X16 mm 5Mp ZK lenses, RV turntable
Proforg
Posts: 4
Joined: 15 Apr 2021, 17:24

Re: 4K projector and suitable cameras for it

Post by Proforg »

Thanks a lot. Now it looks like a waste of money.
LG now looks much better.
User avatar
Micr0
Posts: 516
Joined: 15 Nov 2016, 15:20
Location: New York City

Re: 4K projector and suitable cameras for it

Post by Micr0 »

mading wrote: 14 May 2021, 18:43 Accuracy is related to resolution, which depends on tb dimension of the field of view, the camera and projector resolution, errors etc..
If your field of view is 10 mm, an HD camera divide it roughly in 2000. So your resolution is 0.005 mm. But that's not accuracy.
Thanks for the projector link.
As far as I know, please consider that this projector is a 1920x1080 micro mirror device that is rated as 4k with a trick I can't explain since I do not understand.

Which software are you going to use? Hp3d?
IT's called pixel shifting. It is similar to pixel averaging in that it allows an HD pixel array to simulate a 4K resolution. It is not native 4K.
µ
mading
Posts: 262
Joined: 31 Jan 2017, 13:09

Re: 4K projector and suitable cameras for it

Post by mading »

Micr0 wrote: 16 May 2021, 13:11
IT's called pixel shifting. It is similar to pixel averaging in that it allows an HD pixel array to simulate a 4K resolution. It is not native 4K.
I think that the link I posted in the next post explains it cclearly:

"I would take a look at it:
https://www.projectorjunkies.com/4k-dlp ... planation/"

Still I think it was worth to discover the 0.66" chip and that the shifted pixels gives you half the contrast. Which is very important for us.
HP 3D scan, LG PF50, LG PF1500 David Calibration panels, Melamine panels, DIY rotary table. RangeVision DIY: 2x DahengMer630, 2X12 and 2X16 mm 5Mp ZK lenses, RV turntable
Post Reply