Noob question on SLS

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OBNRacerMan
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Joined: 12 Aug 2019, 09:46
Location: Obninsk, Russia

Re: Noob question on SLS

Post by OBNRacerMan » 11 Jan 2020, 09:51

mading wrote:
10 Jan 2020, 19:51
LG PF50 has square pixels.
1920*1080.
I don’t know how the scanning of this projector will affect the fact that a high resolution is obtained by shifting the matrix (the matrix size is 0.33 inches there)
“Correct” FullHD starts with 0.46 inch matrices

mading
Posts: 138
Joined: 31 Jan 2017, 13:09

Re: Noob question on SLS

Post by mading » 11 Jan 2020, 13:25

OBNRacerMan wrote:
11 Jan 2020, 09:51
I don’t know how the scanning of this projector will affect the fact that a high resolution is obtained by shifting the matrix (the matrix size is 0.33 inches there)
“Correct” FullHD starts with 0.46 inch matrices
Good to know OBN, can you please show where you can find all these informations about matrices?
As soon as I test the projector, I'll upload results.
HP 3D scan, Acer K132, LG PF50, 2x DMK23UX236, 2xComputar M1214, David Calibration panels, Melamine panels, DIY rotary table

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OBNRacerMan
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Location: Obninsk, Russia

Re: Noob question on SLS

Post by OBNRacerMan » 11 Jan 2020, 13:38

mading wrote:
11 Jan 2020, 13:25
Good to know OBN, can you please show where you can find all these informations about matrices?
When I was picking up a projector for a 3D scanner, I read a lot of information on "projector" forums, where I found out that cheap FullHD DLPs have high-frequency matrix shift technology (120Hz) in order to be able to display the general projection field, which consists of two pieces .
Since everywhere they write about projectors from the point of view of watching a movie, no one could say the suitability (or unsuitability) of this technology for 3D scanning (and buying something like that to test is too expensive for me)

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Micr0
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Re: Noob question on SLS

Post by Micr0 » 11 Jan 2020, 16:15

OBNRacerMan wrote:
11 Jan 2020, 13:38
mading wrote:
11 Jan 2020, 13:25
Good to know OBN, can you please show where you can find all these informations about matrices?
When I was picking up a projector for a 3D scanner, I read a lot of information on "projector" forums, where I found out that cheap FullHD DLPs have high-frequency matrix shift technology (120Hz) in order to be able to display the general projection field, which consists of two pieces .
Since everywhere they write about projectors from the point of view of watching a movie, no one could say the suitability (or unsuitability) of this technology for 3D scanning (and buying something like that to test is too expensive for me)
Luckily here in NYC (and Amazon in the US) that have very liberal return policies. I can buy a projector and try it for 30 days and return it no questions asked. I was able to try out a couple of small laser projectors (which gave bad results) that way. If madding likes the PF50 I will get one to try. Finding a spec sheet that includes the pixel orientation screen seems to be harder to do.
µ

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OBNRacerMan
Posts: 139
Joined: 12 Aug 2019, 09:46
Location: Obninsk, Russia

Re: Noob question on SLS

Post by OBNRacerMan » 11 Jan 2020, 16:56

Micr0 wrote:
11 Jan 2020, 16:15
If madding likes the PF50 I will get one to try.
Yes, I am also very interested in how such a projector as a part of a 3D scanner will show itself. I found this on AliExpress (but buying from this year is already much more difficult - they imposed a limit of 200 euros on purchases in foreign online stores).

Mr_Lafuente
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Joined: 15 Jan 2020, 20:34

Re: Noob question on SLS

Post by Mr_Lafuente » 22 Jan 2020, 15:22

mading wrote:
10 Jan 2020, 19:51
Hi there.
LG PF50 has square pixels.
1920*1080.
With battey and wifi screen.
Looking forward to test soon!
Hello mading. Have you tried this projector? I'm getting nuts trying to find one to build my SLS.

mading
Posts: 138
Joined: 31 Jan 2017, 13:09

Re: Noob question on SLS

Post by mading » 22 Jan 2020, 15:47

I just posted some results here: viewtopic.php?f=5&t=2068
:D
HP 3D scan, Acer K132, LG PF50, 2x DMK23UX236, 2xComputar M1214, David Calibration panels, Melamine panels, DIY rotary table

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