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DAVID-Laserscanner Forum • View topic - Calibration Panel - left and right inner point
Dear DAVID Community,

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Calibration Panel - left and right inner point

The place for questions, problems, comments and tips regarding the camera calibration.

Re: Calibration Panel - left and right inner point

Postby hunkatibor2 » Wed Jul 09, 2014 6:43 am

Hi
After reading the above in writing, performed the calibration result is.
Tibor
Attachments
2014-07-09_07-33-42.png
2014-07-09_07-35-43.png
2014-07-09_07-38-36.png
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
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Re: Calibration Panel - left and right inner point

Postby sts » Wed Jul 09, 2014 12:03 pm

Attachments
calib_panel.png
sts
 
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Re: Calibration Panel - left and right inner point

Postby MagWeb » Wed Jul 09, 2014 1:11 pm

You mean the one ring marker is displaced on the original boards shipping with the SLS-2 kit?
Could you post a shot?

A rough size of the makers and a rough ratio of ring and white dot is OK.

Engarving gives one problem: The visible shoulders of the engarving reflect the light different than the ground of the engarving. In certain light/contrast settings this might be a problem if DAVID decides to use the ground only... I use to fill the engarvings with black putty and sanding it carefully.
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Re: Calibration Panel - left and right inner point

Postby sts » Wed Jul 09, 2014 1:41 pm

The problem was an mistake by me with the rebuild of the panel in the CAD program.

The SLS2 glas panel is fine (ive used the 120mm and 240mm for serveral objects). The PDF, CDR and the PNG that comes wird the David Software are great too.

Ok, then i will close the holes.

sts
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Re: Calibration Panel - left and right inner point

Postby NARMELLA » Wed Jul 09, 2014 2:34 pm

Data projector : NEC VE 281
Camera(s) : Canon eos 600D (3x)
Software : Lets scan 2.5 + David laser scanner 3.9
گشتاور صنعت تبریز
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Re: Calibration Panel - left and right inner point

Postby hunkatibor2 » Wed Jul 09, 2014 4:08 pm

Hi Magweb
I have a question. The original embedded software in virtual box by default perfectly meets? My picture is a big gap. Send me a picture of the perfect virtual default calibrated and tested panel. Any mistake can be derived from.
Tibor
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
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Re: Calibration Panel - left and right inner point

Postby Sven » Wed Jul 09, 2014 4:32 pm

Hi STS,

Gunter has already given great tipps and answered your questions, correctly of course, I just want to confirm officially:

- You don't need to change any Advanced Settings unless you build a completely different calibration corner.
- It does not matter if the red and green distances (your first post) have the same length. They don't. DAVID can compensate such offsets ("CompensatePatternOffsets"). It's just not possible to produce foldable perfect calibration corners at a reasonable price. Also when you use the back side (240mm) the offsets will be different anyway. That's why we made DAVID compensate that.
- When you build your own calibration corner, make sure the patterns have no error in ROTATION.
- "ExpectedPlaneOffsetsOfOuterCorner" is for "negative corners" only, not relevant here.
- When "CompensatePatternOffsets" is enabled (default), it is not necessary to set precise values for HardwareSetup - Left/Right-CalibrationPattern - Offset_X/Y/Z
- You can use SLS-2 preset or "Structured Light Setup" preset - no difference in calibration.
- To be sure that the calibration settings are correct, calibrate. Look at the green crosses, they should be placed inside the markers. Zoom in and look the small red error vectors. They indicate the difference between measure marker position and model marker position (length*10). They should be short and irregular. If they show a systematic error, there is a systematic error.
- I don't know your projector model. It may need to warm up before calibration.
- The size (diameter) of the markers is irrelevant. Only the center position is important. The size should be roughly like in the original pattern.
- If one of your markers is located wrong, that's a problem. If the entire left/right pattern is dislocated (offset), DAVID will compensate. If it is rotated, that's a problem too.

Sven
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Re: Calibration Panel - left and right inner point

Postby MagWeb » Thu Jul 10, 2014 9:54 am

@ Narmella
This is a very old idea. We use it since DAVID2.x times.
There are so many useful hints in this forum. But how to keep them visible?
I'd like to ask anybody for help indexing important posts here:


@Tibor
Your gab is due to an offset of the patterns. DAVID's CompensatePatternOffsets compensates this and "moves" the virtual planes to the expected position. No need to worry about.
(Not good - calibration might fail - but possible: Disable CompensatePatternOffsets to keep the virtual edges fitting together )
Think the result posted above by sts are pretty near to be ideal.
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Re: Calibration Panel - left and right inner point

Postby sts » Thu Jul 10, 2014 11:33 am

sts
 
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Re: Calibration Panel - left and right inner point

Postby sts » Thu Jul 10, 2014 2:58 pm

Sooooo... a cnc session, a calibrating session, a scan session and a (short) alignment session. And it looks decent:
pipe_done.png

(I have not placed much value on the inner part of the pipe)

The Calibration:
2014-07-10 14_39_05-DAVID-LASERSCANNER v3.10.0.jpg

x2014-07-10 14_39_31-DAVID-LASERSCANNER v3.10.0.jpg


The both right is the largest red lines. But totally other direction.

sts
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Re: Calibration Panel - left and right inner point

Postby sts » Thu Jul 10, 2014 3:05 pm

The "MagWeb"-Check:
y2014-07-10 14_41_34-DAVID-LASERSCANNER v3.10.0.jpg


Overall it looks nice.

Again the result but with texture:
pipe_done.png


Thank you to all.

sts
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Re: Calibration Panel - left and right inner point

Postby BoneIndustries » Thu Jul 31, 2014 6:15 pm

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Re: Calibration Panel - left and right inner point

Postby BoneIndustries » Fri Aug 01, 2014 2:49 pm

Can someone please let me know what geometry of the calibration panels that cam with the SLS-1 kit looks like. The plastic hinges have come unstuck and I think that I am seeing bowing of scans.

Also, I measured the distance from the corner edge to the first dot on each panel and there is a difference of 2mm. I'll post a pic later when I get home.
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Re: Calibration Panel - left and right inner point

Postby BoneIndustries » Fri Aug 01, 2014 9:30 pm

Below is how my calibration corner came with my SLS-1 kit. Even thou two of the hinges became unstuck, I was able to re-stick them in the same location, allowing for the two pieces to just just touch in the corner. (The top corner bracket is removed for clarity.)
20140801_160239.jpg


In the two following images you can see that the distance from the corner to the reference mark for the overall location of the dots are different. The left side measures 3/16" (4.76mm) and the right side measures 3/32" (2.38mm), for a difference of 3/32"(2.38mm).

Left side from the top
20140801_160519.jpg

Right side from the top
20140801_160604.jpg


What needs to be done to get the calibration corner correct? I always thought something was a little off with my scans, but I couldn't figure out what is was until I started reading this thread.
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Re: Calibration Panel - left and right inner point

Postby BoneIndustries » Fri Aug 01, 2014 10:28 pm

Here is a part and scan that I working on.

Exposure: 1/60
Brightness: 159
Quality Check: 0.4
Auto Texturing enabled
Auto align after each scan, then preform Global alignment.
20140801_171457.jpg
2014-08-01_17-15-19.png
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