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DAVID-Laserscanner Forum • View topic - [Gallery] SL results
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[Gallery] SL results

Discussions about latest DAVID developments, beta versions...

Postby hal » Wed May 11, 2011 10:47 pm

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MatM_D3_SLMoreTests.jpg
MatM_D3_SL_PhaseShifts.jpg
MatM_D3_SL_NegativeCorner.jpg
MatM_D3_SL_PhaseShifts_Negative.jpg
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Re: [Gallery] SL results

Postby Simon » Thu May 12, 2011 9:02 am

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Postby hal » Sat May 14, 2011 1:12 pm

Hello and Thanks to your kindly answer, Simon.

Well, here an other test of scanning, with a negative corner (the dark side of the Moon, or the dark side of the Force ah ah :lol: ). Frequencies = 8, Shifts = 16, PHT (PatternHoldingTime) = 200.

MatM_ArtifactsIfTheWhitIsTooLight.jpg

The projector-calibration check sounds good, isn't it? :wink:

SOLVED - This was my fault! I've forgotten to modify the PHT value in relation to the new exposure value, sorry. Obviously at low PHT and high Exposure values, the software can't catch correctly all the patterns, so deformations appears :oops: .

Regards,
Mattia
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Re: [Gallery] SL results

Postby MagWeb » Sat May 14, 2011 1:29 pm

Hi Mattia,

Did you play with the Brightness value in SL adv.sets? There you can dim down the projector...
Also think 16 shifts @freq 8 may be a bit high. Don´t think your projector can put that out correctly.
(I use to use 3 or 4 shifts)

Suggestion: In my SL Grabber Soft for 2.x, I dimmed the projector by using /mixing RGB Chanels. This way one can adjust the light color AND intensity to the needs of the object. I found this rather useful.

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Re: [Gallery] SL results

Postby MagWeb » Sat May 14, 2011 2:38 pm

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Postby hal » Sat May 14, 2011 2:41 pm

Thanks Gunter,

Ok, I'll try your suggestions in the nexts tests. Thanks.
My suggestion to S&S to fix the problems with brightness/darkness and to optimize the scanning process, is more related to the possible competition with others scanners. If David can manage better these problems, could be more flexible and usefull in a lot of light conditions.

mmm Why do you say that I have 480 lines? my working res is 1024x768.

Regards,
Mattia
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New Test

Postby hal » Sat May 14, 2011 2:53 pm

Hi,

here the result of a new test, with the White value adjusted.
Geometry is good, but the regular noise is still there :evil:

MatM_D3_ScanningTestQuiteGood.jpg

As you can see, the mesh is good, but not still perfect as I dream.

MatM_MeshNotPerfect.jpg

Mattia
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Re: [Gallery] SL results

Postby MagWeb » Sat May 14, 2011 3:05 pm

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Postby hal » Sat May 14, 2011 3:10 pm

Well, sincerly I've discarted the Optoma, for this moment.
As I wrote in the other post about projector, the transition of RGB seems too slow and it create terrible noise.

Now I use an other mini projector that cames with from 4DDynamics company.
It have 800x600 native resolution, and now I'm working at 1024x768 interpolated.

Mattia
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Nice result

Postby hal » Sat May 14, 2011 5:34 pm

Hello,

here my latest and best scan result. Still little noise, but acceptable for a beta :lol:

The Phase Error (mmm seems my encephalogram... flat! :lol: ):
MatM_PhaseError.jpg
MatM_PhaseError.jpg (31.53 KiB) Viewed 4226 times

The scan result:
MatM_D3_NiceScanResult.jpg

Camera parameters:
MatM_D3_CameraParameters.jpg

SL parameters:
MatM_D3_AdvSet_SLgood.jpg

I admit that now I'm more satisfied, but I think that the precision (comparison between virtual and real scanned corner) and lines-noise must be solved more deeply.

However compliments to Sven and Simon.
Mattia
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Postby hal » Sat May 14, 2011 6:23 pm

And here a quick result of good aligning and fusion.

MatM_ExampleResult.jpg

MatM_ExampleResultFusion.jpg
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Re: [Gallery] SL results

Postby WalterMo » Sat May 14, 2011 7:37 pm

Hi,
During the last hours I have made a lot of tests and finally found these settings for my ACER K11 projector with its native resolution of 858 x600:

Settings graphic card:
800 x 600, 32 Bit, 96 dpi, 60Hz.

Advanced settings Structured Light:
Orientation: Both
Pattern Mode: d+ps
Frequencies: 8 (at '6' and '7' are fine V formed stripes!!)
Brightness: 255
PatternHoldingTime: 250
MinContrast: 6

PhaseShift
Shift: 4
Multiplier: 3


The camera was the USB color cam from the DAVID shop. To avoid mutually illuminations of the panels I had put a black cardboard into the corner. Adapter lens (f=400mm) in front of the Acer lens.
Annoying is during, respectively after the projector calibration that I have to wait more than 3 minutes until the small phase error window pops up. :(

I know that I still have to learn a lot. But as we say „Rome was also not built-up during one day“.

Walter Maximo
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Postby hal » Sat May 14, 2011 10:10 pm

Hello.

Concerning my old post on date Sat May 14, 2011 1:12 pm, as I wrote, I've done a mistake, now solved.
Here you can see a quite satisfying result about a dark object without coating. I've played a lot with PHT, Exposure and Gamma values.
The result seems promising.

MatM_D3_VeryDarkObject.jpg

The tests continued ... :wink:
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Re: [Gallery] SL results

Postby MagWeb » Sat May 14, 2011 10:48 pm

hi Mattia

looks good.
You wrote, you made a mistake. May I ask which one?

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Postby hal » Sat May 14, 2011 11:40 pm

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