Projectors... and Projector Mods.

Discuss about cameras, projectors, calibration panels, turntables etc.
bigbomber
Posts: 88
Joined: 14 Dec 2017, 18:08

Re: Projectors... and Projector Mods.

Post by bigbomber » 03 Feb 2018, 18:48

mading wrote:
02 Feb 2018, 21:37
"Erapip can you take a photo of your calib panel by a high quality camera (dslr if possible). I want to check it.
But resolution should not exceed 6MPixel."

Hi BigBomber,
I would like you to check my 220 mm panel. I'll appreciate.
Is the same panel I used in the second test I posted in our previous discussion. I double checked it and it does not seems so bad in terms of dot precision.
I'm waiting for some "Arca style" stuff in order to made my setup look more professional.
I hope results will improve too. :-)
I've just check yours. it is a good panel. RMS is 0.117 . you must get good result using it
How do you print patterns? using a desktop laser printer?

mading
Posts: 142
Joined: 31 Jan 2017, 13:09

Re: Projectors... and Projector Mods.

Post by mading » 03 Feb 2018, 19:24

Great! At a local shop. It's printed directly over the wood panel. They use to print big forex and aluminum panels. Don't know which system they use.
HP 3D scan, Acer K132, LG PF50, 2x DMK23UX236, 2xComputar M1214, David Calibration panels, Melamine panels, DIY rotary table

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Micr0
Posts: 426
Joined: 15 Nov 2016, 15:20

Re: Projectors... and Projector Mods.

Post by Micr0 » 05 Feb 2018, 16:29

I just got some time to run the calibration routine with the debug console open. I got different results depending on if the "MultipulCameraoptimization" setting was on or not. With the Setting off it was reading my panels as being 90º. With it on it says they are at 89.36º. Not an insignificant difference. I measure them with our CMM and got ~90.007º. I didn't check for flatness, but for 225mm panels I'll take this as good.

Without Optimization I got RMS error value of .2834_

How much is this due to the projector intrinsics?

More later.
µ

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Micr0
Posts: 426
Joined: 15 Nov 2016, 15:20

Re: Projectors... and Projector Mods.

Post by Micr0 » 05 Feb 2018, 17:05

Trying to connect forcing that format...
Connected.
Trying to connect forcing that format...
Connected.
Number of cameras: 2
Is system calibrated: yes
-> Setup is 'outer/negative corner'
- RMS error is ok: 0.279629
<camera_model>CameraTsai</camera_model>
<cx>913.70644832991160911</cx>
<cy>597.64617337348499859</cy>
<f>3154.5988090587361512</f>
<sx>0.99833138870442506008</sx>
<kappa1>6.3553036267812714958e-09</kappa1>
µ

bigbomber
Posts: 88
Joined: 14 Dec 2017, 18:08

Re: Projectors... and Projector Mods.

Post by bigbomber » 05 Feb 2018, 20:58

Micr0 wrote:
05 Feb 2018, 16:29
I just got some time to run the calibration routine with the debug console open. I got different results depending on if the "MultipulCameraoptimization" setting was on or not. With the Setting off it was reading my panels as being 90º. With it on it says they are at 89.36º. Not an insignificant difference. I measure them with our CMM and got ~90.007º. I didn't check for flatness, but for 225mm panels I'll take this as good.

Without Optimization I got RMS error value of .2834_

How much is this due to the projector intrinsics?

More later.
Thanks for replay.
Certainly is due to displacement of dots on calib panel.
Your panel is not accurate enough. and variable RMS occur when dots are not at same exact distance from eachother.
projector does not have any effect on RMSError.
Notr 90 deg of panel can be deviated a little, and software can compensate for it.

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Micr0
Posts: 426
Joined: 15 Nov 2016, 15:20

Re: Projectors... and Projector Mods.

Post by Micr0 » 07 Feb 2018, 02:15

Better.....


Importing hardware setup from C:\Program Files\DAVID 3D SCANNER 5\Settings\HardwareSetup.Custom.hp3dscansetup ...
Trying to connect forcing that format...
Connected.
Trying to connect forcing that format...
Connected.
Number of cameras: 2
Is system calibrated: yes
-> Setup is 'inner corner'
- RMS error is ok: 0.185393
<camera_model>CameraTsai</camera_model>
<cx>952.11861657557324179</cx>
<cy>587.2040818384529075</cy>
<f>3163.2878229041107261</f>
<sx>1.0001256136502350014</sx>
<kappa1>7.9432894429384492823e-09</kappa1>
µ

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Micr0
Posts: 426
Joined: 15 Nov 2016, 15:20

Re: Projectors... and Projector Mods.

Post by Micr0 » 07 Feb 2018, 05:03

BTW in you opinion, does the relative size of the dots matter? With in reason of course.
µ

bigbomber
Posts: 88
Joined: 14 Dec 2017, 18:08

Re: Projectors... and Projector Mods.

Post by bigbomber » 07 Feb 2018, 07:15

Micr0 wrote:
07 Feb 2018, 05:03
BTW in you opinion, does the relative size of the dots matter? With in reason of course.
Accurate size is not important, but roundness is very important.

mading
Posts: 142
Joined: 31 Jan 2017, 13:09

Re: Projectors... and Projector Mods.

Post by mading » 08 Feb 2018, 20:26

Hi all,
I did a test with the 220 panel I posted above:
I had a strange behaviuor with my camera: it switched to 15 fps. Seems that I have something not ok with USB 3.0.
I made a better calibration before this one: I had RMS 0.11. Panels were more frontal to the camera.

Trying to connect forcing that format...
Connected.
-> Setup is 'inner corner'
- RMS error is ok: 0.126043
<camera_model>CameraTsai</camera_model>
<cx>904.64694820276702103</cx>
<cy>589.89492473940981654</cy>
<f>4333.4177174864180415</f>
<sx>1.0001496667328608758</sx>
<kappa1>2.658304654943530827e-09</kappa1>
<resX>1920</resX>
<resY>1200</resY>
[..]
CalibrateProjector: leftBackPlane = (p=5.88904e-16 5.88904e-16 92.1175 1 n=1 -0 -6.12323e-17 0)
CalibrateProjector: rightBackPlane = (p=92.0871 -0.416565 1.17408e-15 1 n=-1.22465e-16 -0 1 0)
Angle between calibration panels: 90 degree
Size of camera's center pixel at background plane: 0.513903 mm
cy=-0.5 rmsError=0.00280825
cy=0 rmsError=0.00280745
cy=0.5 rmsError=0.00280813
cy=1 rmsError=0.00171801
cy=1.5 rmsError=0.00171801


I made a couple of scan rotating the panels, and compared results. At 0.2 mm it looks like this:
2018-02-08_21-17-55.png
HP 3D scan, Acer K132, LG PF50, 2x DMK23UX236, 2xComputar M1214, David Calibration panels, Melamine panels, DIY rotary table

bigbomber
Posts: 88
Joined: 14 Dec 2017, 18:08

Re: Projectors... and Projector Mods.

Post by bigbomber » 09 Feb 2018, 08:12

mading wrote:
08 Feb 2018, 20:26
Hi all,
I did a test with the 220 panel I posted above:
I had a strange behaviuor with my camera: it switched to 15 fps. Seems that I have something not ok with USB 3.0.
I made a better calibration before this one: I had RMS 0.11. Panels were more frontal to the camera.

Trying to connect forcing that format...
Connected.
-> Setup is 'inner corner'
- RMS error is ok: 0.126043
<camera_model>CameraTsai</camera_model>
<cx>904.64694820276702103</cx>
<cy>589.89492473940981654</cy>
<f>4333.4177174864180415</f>
<sx>1.0001496667328608758</sx>
<kappa1>2.658304654943530827e-09</kappa1>
<resX>1920</resX>
<resY>1200</resY>
[..]
CalibrateProjector: leftBackPlane = (p=5.88904e-16 5.88904e-16 92.1175 1 n=1 -0 -6.12323e-17 0)
CalibrateProjector: rightBackPlane = (p=92.0871 -0.416565 1.17408e-15 1 n=-1.22465e-16 -0 1 0)
Angle between calibration panels: 90 degree
Size of camera's center pixel at background plane: 0.513903 mm
cy=-0.5 rmsError=0.00280825
cy=0 rmsError=0.00280745
cy=0.5 rmsError=0.00280813
cy=1 rmsError=0.00171801
cy=1.5 rmsError=0.00171801


I made a couple of scan rotating the panels, and compared results. At 0.2 mm it looks like this:
2018-02-08_21-17-55.png
What make you think there is a problem on usb3? Difference between 0.11 and 0.126?
Your panel is not perfect, so some difference is expected regards to how camera see and read your panel.
David/HP is very sensetive to calibration panel.

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