Dear DAVID Community,

As you are probably aware, the entire DAVID company, team and product range has been integrated into HP Inc.
This forum is now read-only. Relevant content has been migrated to HP and merged into HP's Support Forums on November 1, 2016.

To start new discussions for 3D Scanning, please register and post your new topic at the HP Support Forums

HARDWARE AND SETTINGS COMPARAISON

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sun Feb 07, 2016 6:21 pm

Decided to test the Acer K11 projector..

Results are Ok,but the NEC gives much better surface finish.

I also played around with a polarizing filter in front of the lens. I let you judge.

Setup

Horizontal with negative calibration board
Panasonic GH4 (1920 x 1080 @ 60p) + Canon Macro lens + Blackmagic HDMI card + Acer K11 (with closeuup lens) + 27 patterns
Angle : around 30 degree
Distance to object 12 cm

Green gorilla is without polarizing filter
Attachments
2016-02-07_18-17-52.png
2016-02-07_18-20-05.png
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sun Feb 07, 2016 7:16 pm

Horizontal setup, everything else the same

Green without polarizing filter
Attachments
2016-02-07_19-14-32.png
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sun Feb 07, 2016 7:25 pm

I saw horizontal lines moving across the screen.

I don't have the same fine shutter speed adjustement with the Panasonic as with the Canon 60D + magic lantern.

But my graphic card allows me to make custom resolution settings.

I went from 60 hz to 61 hz.

Much better, no more lines in preview and less lines on the surface of the gorilla.

Green @ 60 hz projection frequency
Brown @ 61 hz projection frequency
Attachments
2016-02-07_19-20-12.png
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby hunkatibor2 » Sun Feb 07, 2016 7:54 pm

Hi
Then this is the key to the frequency adjustment.
Tibor :D
Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
hunkatibor2
 
Posts: 1408
Joined: Tue Mar 16, 2010 4:26 pm
Location: Hungary

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Mon Feb 08, 2016 10:56 am

Yes Tibor, I think this could solve a lot of surface issues due to synch problems.
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby micr0 » Wed Feb 10, 2016 7:20 pm

I finally got a proper lens for the new IS camera and what a difference it makes. I no longer have any alignment issues and the detail is remarkable. To use a lens with this camera it has to be for a 1" sensor. anything for a smaller sensor will have errors due to the distortion at the edges that a smaller sensor would see. this new lens is huge and was surprisingly expensive. It makes the combination of this camera and lens a very pricey option however it is still less expensive that an DSLR with clean HDMI output. The other note is that the focal length changes with this format. Where I was using a 12mm lens, I now needed a 16mm in order to have the same field of view. Images of my first scan will be coming.

µ

1-P1120134.JPG


Seen here with the David cam-3 with Computar 12mm lens for comparison.
µ
micr0
 
Posts: 315
Joined: Wed Mar 19, 2014 3:54 pm
Location: NYC

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Thu Feb 11, 2016 1:50 pm

Hi Micr0

Could you post an image of your setup. I see that everything is holding on an aluminium pole (40 x40 ?).

If you could take a picture with the camera and the projector in view.

Thanks,
Jeff
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby micr0 » Thu Feb 11, 2016 2:06 pm

The mounting hardware was originally made for my first projector and camera but I've made it work. The extrusion is 25mm. I designed and entirely new mounting system that will allow me to use the camera both overhead or to the side but haven't had the time to actually make it yet.


µ

1-P1120132.JPG
µ
micr0
 
Posts: 315
Joined: Wed Mar 19, 2014 3:54 pm
Location: NYC

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Thu Feb 11, 2016 2:16 pm

Thanks.

I am looking forward to seeing some scans with your new camera and projector.

Jeff
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby micr0 » Sun Feb 14, 2016 7:55 am

Yeah, Me too. :)
I've just spent the last 8 or so hours trying to solve a big problem. The scans I was getting from the new camera and projector were sharper and had higher detail than the scans from my previous camera projector combo. However there turned out to be a major problem. At first i though that the scans weren't aligning properly but I quickly realized that the scans them selves were not good. The further the depth or the further you got away from the center of the object the greater the inaccuracy of the scan date.

MisMatch1.jpg



I spent this entire day chasing this problem. at first I thought it might be a calibration problem. i tried different calibration panels, distances etc, etc. nothing made the problem any better. I had been using outside corners for calibration so I decided to tru the traditional inside corner to see if that had any effect. it didn't but it gave me a clue as to what was going on.

Cal Panel1.jpg


I finally noticed the distortion in the calibration panels and knew that it wasn't a calibration or alignment issue. At first I suspected the camera or lens so I swap them out for my older David cam-3. but that didn't solve the problem. then I swapped out the projector and the problem went away. I replaced the David cam with the New IS cam (old projector) and the problem didn't come back. So now I know it is a projector problem. When I have time I'll go through the settings of this new projector and see if I can figure out why it is causing these problems. The other interesting think is the when I was scanning with the old projector (optoma ML550) my scan speed increased and I was able to get complete scans at a full 60FPS. 12 "quality" scans including align with previous, took just over 1min 34sec complete and the scans are lining up perfectly now.

block1.jpg


The problem here is that the new IS camera is on a very different frequency than the Optoma projector and the surface quality of the scans is horrible.

I'm not in the shop for a while but will post more when I have it.



µ
µ
micr0
 
Posts: 315
Joined: Wed Mar 19, 2014 3:54 pm
Location: NYC

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Jokeri » Mon Feb 15, 2016 10:57 am

Huoh, that confirms my suspicion that SLS-2 kit is kind of shit and i wish that I would have figure out this before I bought the kit.
Camera optics are mediocore, probably projector optics is too or its worse and not to mention the calibration method.
You have to have the panels exatly at 90degrees, how do you do that?
When you focus the projector not all the image is sharp because of the 90 panel angle, same goes for the camera.

Better way would be to have single flat panel with 2 cameras, just like most of competition is doing..

:(
Jokeri
 
Posts: 36
Joined: Sun Mar 27, 2011 3:24 pm

Re: HARDWARE AND SETTINGS COMPARAISON

Postby drndadoo » Mon Feb 15, 2016 11:26 am

"When you focus the projector not all the image is sharp because of the 90 panel angle, same goes for the camera."

DAVID compensate some minor imperfections with the calibration process, I think that one is included. Also lens distortion effect is compensated by the calibration process.
I am not sure how would it be to use tilt shift objective
https://en.wikipedia.org/wiki/Tilt%E2%80%93shift_photography
drndadoo
DAVID Support
 
Posts: 194
Joined: Tue Mar 24, 2015 3:09 pm

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Mon Feb 15, 2016 11:53 am

The panel must be build with a "good" 90 degre angle.

The camera, projector or both do NOT need to be at 90 degree from the calibration panel.

What's so difficult ?

I don't know the lens you have, but that could be upgraded if you think that causes problems.
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
Curiousjeff
 
Posts: 230
Joined: Fri Feb 27, 2015 2:17 pm
Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Jokeri » Mon Feb 15, 2016 12:36 pm

drndadoo wrote:
"When you focus the projector not all the image is sharp because of the 90 panel angle, same goes for the camera."

DAVID compensate some minor imperfections with the calibration process, I think that one is included. Also lens distortion effect is compensated by the calibration process.
I am not sure how would it be to use tilt shift objective
https://en.wikipedia.org/wiki/Tilt%E2%80%93shift_photography


Apparently david doesnt do good job with the compensation

https://www.dropbox.com/s/2hh97yof7gn2w ... m.JPG?dl=0

https://www.dropbox.com/s/emh3qlhaoiuzx ... m.JPG?dl=0

https://www.dropbox.com/s/7pumzda9lrplm ... m.JPG?dl=0
Jokeri
 
Posts: 36
Joined: Sun Mar 27, 2011 3:24 pm

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Jokeri » Mon Feb 15, 2016 12:37 pm

Curiousjeff wrote:The panel must be build with a "good" 90 degre angle.

The camera, projector or both do NOT need to be at 90 degree from the calibration panel.

What's so difficult ?

I don't know the lens you have, but that could be upgraded if you think that causes problems.


Isnt the SLS-2 kit supposed to work well right out of the box?
Jokeri
 
Posts: 36
Joined: Sun Mar 27, 2011 3:24 pm

PreviousNext

Return to Structured Light Scanning

Who is online

Users browsing this forum: No registered users and 2 guests