Dear DAVID Community,

As you are probably aware, the entire DAVID company, team and product range has been integrated into HP Inc.
This forum is now read-only. Relevant content has been migrated to HP and merged into HP's Support Forums on November 1, 2016.

To start new discussions for 3D Scanning, please register and post your new topic at the HP Support Forums

Advance Hardware settings some questions

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

Advance Hardware settings some questions

Postby Artisan S » Sun May 04, 2014 8:16 am

Naamloos.png


This is the Advanced Setting page.....

Now I have made my own calibration corners (using a 3D printer)......now I find that "closing" scans isn't as straightforward as planned (:-(). So back to the drawing board and grab the old triangle ruler from high school and measure.....then curse a bit. It is 89.2 degrees......now in the above field are some parameters:

Tab: Camera -> Calibration -> CompensatePatternOffsets = checked (default = checked)
Tab: Camera -> Calibration -> CompensateRotInPlane = checked (default = unchecked)

Tab: Hardware Setup -> LeftCalibrationPattern -> Offset_X = 0
Tab: Hardware Setup -> LeftCalibrationPattern -> Offset_Y = 0
Tab: Hardware Setup -> LeftCalibrationPattern -> Offset_Z = 0
Tab: Hardware Setup -> LeftCalibrationPattern -> Rot_X = 0
Tab: Hardware Setup -> LeftCalibrationPattern -> Rot_Y = 0
Tab: Hardware Setup -> LeftCalibrationPattern -> Rot_Z = 0

Tab: Hardware Setup -> RightCalibrationPattern -> Offset_X = 0
Tab: Hardware Setup -> RightCalibrationPattern -> Offset_Y = 0
Tab: Hardware Setup -> RightCalibrationPattern -> Offset_Z = 0
Tab: Hardware Setup -> RightCalibrationPattern -> Rot_X = 0
Tab: Hardware Setup -> RightCalibrationPattern -> Rot_Y = 0
Tab: Hardware Setup -> RightCalibrationPattern -> Rot_Z = 0

Now something tells me these setting could be used to compensate for angle defect (I'll check the printer right away and compensate there so this should be a thing of the past). But what I need to know (and cannot find in the documentation) is how are these angles measured? Especially Rot_Z as that should be the up down axis in a classical european setup of axes.

Greets, Ed.
Artisan S
 
Posts: 26
Joined: Fri Mar 14, 2014 12:26 pm

Re: Advance Hardware settings some questions

Postby MagWeb » Sun May 04, 2014 10:49 am

DAVID uses Y-up coordinates (not the CAD way were it is Z-up). The Y axis is along the corners edge, means it is the vertical axis ( Zero in height is were four ring markers are on a common plane).

Assuming a standard corner (not a "negative" one):
If your corner is 89.2° you are missing 0.8°. If you want to do the correction on both sides equally you are missing 0.4°on each side with reverse directions.

Looking from above, a negative value means a clockwise rotation.

You've to set:

Hardware Setup -> LeftCalibrationPattern -> Rot_Y = 0.4 ; (POSITIV)
Hardware Setup -> RightCalibrationPattern -> Rot_Y =-0.4; (NEGATIVE!)

(alternative: You may set 0.8 on one side e.g - 0.8 for the right pattern)
MagWeb
Moderator
 
Posts: 2499
Joined: Wed Jul 18, 2007 8:48 pm

Re: Advance Hardware settings some questions

Postby Artisan S » Sun May 04, 2014 1:20 pm

Thanx, Magweb,

Nice consiced and detailed information. Did I mis this in the handbook? If not I guess it should be added.

Greets, Ed.
Artisan S
 
Posts: 26
Joined: Fri Mar 14, 2014 12:26 pm

Re: Advance Hardware settings some questions

Postby NARMELLA » Mon Aug 04, 2014 2:51 pm

Hi Magweb

It was really useful answer.

I have 4 calibration pattern sizes. and the question is :

Is there a way to save setting and reload it when needed ?

NARMELLA
Data projector : NEC VE 281
Camera(s) : Canon eos 600D (3x)
Software : Lets scan 2.5 + David laser scanner 3.9
گشتاور صنعت تبریز
User avatar
NARMELLA
 
Posts: 354
Joined: Thu May 29, 2014 9:18 am

Re: Advance Hardware settings some questions

Postby MagWeb » Mon Aug 04, 2014 5:14 pm

Just an ad to what I said above:
In normal cases you should not need that for DAVID's auto compensation tries to correct errors. To get an effect of self-defined angles you've to disable auto compensation.

Your question:
There's a UserSettings.xml in the directory Settings.
You may copy and change its name. Each time befor starting DAVID you've to rename the used one...
Or maybe simpler:
Copy the whole DAVID directory to stick or HDD several times. Name the directories as "DAVID_140mm", "DAVID_200mm"... or something similar.
MagWeb
Moderator
 
Posts: 2499
Joined: Wed Jul 18, 2007 8:48 pm

Re: Advance Hardware settings some questions

Postby NARMELLA » Mon Aug 04, 2014 7:15 pm

Hi

And Thank you Magweb.

It was so clear and useful .

NARMELLA
Data projector : NEC VE 281
Camera(s) : Canon eos 600D (3x)
Software : Lets scan 2.5 + David laser scanner 3.9
گشتاور صنعت تبریز
User avatar
NARMELLA
 
Posts: 354
Joined: Thu May 29, 2014 9:18 am


Return to Camera Calibration

Who is online

Users browsing this forum: No registered users and 1 guest

cron