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HARDWARE AND SETTINGS COMPARAISON

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

Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Wed Nov 11, 2015 10:36 pm

Hmm, weird, PAL and 25 or 12.5 fps in ML does not help. BUT, I changed the beamer refresh rate from 60 to 75Hz in the graphics card driver and now the moving bars in live view are gone!

But not the stripes in the scans :evil:

Are there any other settings that I can try? In the advanced settings? I read a lot about those stripes in the forum but can't really find a solution...
Or is that another problem? Something like reflections?
Sometimes it's bad like this in horizontal setup:

2015-11-11_22-32-25.png
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Fri Nov 13, 2015 11:47 pm

Here are some results that I get out of the combination Acer K11 and Canon EOS 550D. R2D2 is about 10cm in height, the Skylander 7cm. Good enough to 3D print, but still room for improvement.

R2D2
2015-11-13_23-38-02.png
R2D2


Skylander
2015-11-13_23-29-03.png
Skylander
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Sat Nov 14, 2015 11:30 am

Here's a test with the Acer K11 and a modified Logitech C600 with this lense https://www.conrad.de/de/ueberwachungskamera-objektiv-brennweite-12-mm-blickwinkel-26-sygonix-43191d-754147.html

Projector and Camera 800x600, 15 fps.

2015-11-14_11-14-13.png


Canon LiveView was better, at least with this lense.

Please tell me if I am boring you :)
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Idea Beans » Mon Nov 16, 2015 5:30 am

If I'm to get a Nikon D5200 camera, can I plug it into my laptop using USB connection just like DAVID CAM 3 camera?
I've read all the posts in this thread but I didn't quite understand why you need a Black Magic capture card or HDMI card.

Please advise.

Thanks
Sarah
Projector - Acer K11 / Acer P1285 SVGA HDMI 3200 Lumens (larger scale scans)
Camera - DAVID Cam 3 (preferred) / Logitech C920 HD Webcam (poor quality, doesn't work with DAVID 4)
Software - DAVID 3 / DAVID 4

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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Mon Nov 16, 2015 6:45 am

Hey Sarah,

the David software does not support Nikon cameras directly. That's why you need a capture card for these.

You find supported hardware in the FAQ.
http://www.david-3d.com/en/support/faq

Greetings!
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Mon Nov 16, 2015 1:20 pm

This is correct regarding Nikon cameras.

For Canon cameras, only the "low" resolution Live view works natively with David.

To get higher resolution with a DSLR, you must usually use the image grabber mode (which is much faster the help of Namella's Lets scan). This process should be tested once you have mastered David in live view.

The HDMI capture card was a test I made. I am very satisfied with the result. For more details on this approach, read here:

http://forum.david-3d.com/viewtopic.php?f=15&t=6550&p=32985&hilit=HDMI#p32985

and here:

http://forum.david-3d.com/viewtopic.php?f=16&t=6534&hilit=HDMI

Another advantage is that DSLRs with "clean HDMI outptut" do not compress the output signal.

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
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Idea Beans » Thu Nov 19, 2015 10:31 am

Thanks for the reply. I guess I'd better get DAVID CAM 3.1 camera if I'm to set up another scanning rig. Using DSLR cameras seemed a bit tricky for my liking. :P
Projector - Acer K11 / Acer P1285 SVGA HDMI 3200 Lumens (larger scale scans)
Camera - DAVID Cam 3 (preferred) / Logitech C920 HD Webcam (poor quality, doesn't work with DAVID 4)
Software - DAVID 3 / DAVID 4

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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Thu Nov 19, 2015 10:41 am

I think, that's a good idea! I'll do that too as soon as my bank account will allow :)
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Sat Nov 28, 2015 12:26 am

These two figures are 3 and 4 cm in height. After all, Canon 550D and Acer K11 may be good enough for hobbyist purposes...

2015-11-28_00-07-50.png
Angel 3cm


2015-11-17_21-33-57.png
Karnimani 4cm


There's a 2cm guy waiting on my shelf, for him I need another closeup lens for the projector.
Acer K11 with closeup lenses, Canon EOS 550D
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sat Jan 16, 2016 5:17 pm

4K camera with David.

From left to right

Canon Live view
Canon image grabber 21 patterns
Nikon fullHD + Blackmagic Intensity Pro 4K HDMI capture card
GH4 4k + Inogeni 4K HDMI capture card
Attachments
2016-01-16_17-09-14.png
2016-01-16_17-09-24.png
2016-01-16_17-09-32.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
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby DerHuette » Sat Jan 16, 2016 10:20 pm

Wow, very impressive!

Never thought, your test gorilla is so hairy! :-)

Greetings,
DerHuette
Acer K11 with closeup lenses, Canon EOS 550D
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Posts: 28
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby micr0 » Sat Jan 16, 2016 11:25 pm

Excellent work. The last scan almost seems too detailed. Almost as if the texture is too rough or as if the contrast is set too high. Is the gorilla model you are scanning actually that textured? Can you post a picture? That is a 4K HDMI stream from the Panasonic yes?

µ
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sun Jan 17, 2016 11:08 am

"That is a 4K HDMI stream from the Panasonic yes?"

Yes, direct from Panasonic GH4 to Inogeni capture device to David.

This device has no driver, no software to install. You just plug it in and it is "visible" as a webcam in any application that accepts Directshow

I checked the actual resolution of the image capture by David by looking in the control folder "SL-TestSequence".

Images are 3840 x 2160 (8.3 M pixels) vs FullHD from Nikon (2 M. pixels) ! 400% more.

"The last scan almost seems too detailed. Almost as if the texture is too rough or as if the contrast is set too high. Is the gorilla model you are scanning actually that textured?"

You are absolutely right. There is a big problem for the moment. Here is a close-up of the surface of the gorilla. There is clearly a surface artifact problem.

Once again, it's a treasure hunt to discover the culprit

Frequency difference between projector and camera ?
Need high resolution projector ?
Surface reflexion ?
Internal GH4 cropping artifact ?
...

Jeff
Attachments
2016-01-17_11-02-55.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
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Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Sun Jan 17, 2016 10:48 pm

Top row from left to right: GH4 4k + Inogeni 4K HDMI capture card

4 identical scans, fused at 1000
4 identical scans, fused at 1500
Single scan, fused at 1500

Lower row:

Canon Live view, no fusion
Nikon fullHD + Blackmagic Intensity Pro 4K HDMI capture card, no fusion
Canon image grabber 21 patterns, no fusion
Attachments
2016-01-17_22-47-04.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
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Location: Geneva, Swizerland

Re: HARDWARE AND SETTINGS COMPARAISON

Postby Curiousjeff » Wed Feb 03, 2016 12:40 pm

A very nice feature on the Panasonic GH4 is focus peaking.

As you place your object in front of the camera, the camera LCD highlights in yellow the section that is in focus.

This is very convenient for placing the item at the best possible place, especially if the item is very small.

This does not affect the signal being sent to DavidLS which is a clean HDMI Out.
Attachments
GH4-screenshoot.jpg
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
 
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