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DAVID-Laserscanner Forum • View topic - Calibration without page layout
Dear DAVID Community,

In 2016, DAVID and this forum have been integrated into HP Inc.
This forum has been read-only since then, and will be switched off by then end of 2019.

To everyone who has contributed here, we thank you for all your work and for the constructive, helpful and friendly atmosphere you have created!
Please continue to discuss on the HP Support Forums.

Calibration without page layout

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

Calibration without page layout

Postby luca.rea » Sun Apr 29, 2007 9:33 am

Does is possible to acquire 3D objects without page layout for calibration but inserting known camera's data manually?? :roll:
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Postby masterkielbaster » Sun Apr 29, 2007 11:43 am

not in david :P
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Postby Simon » Sun Apr 29, 2007 12:00 pm

During the camera calibration, DAVID measures the relative pose of the camera with respect to the coordinate system of the background corner. Furthermore the software measures the focal length and some radial lens distortion parameters. All values are saved in the config.xml file. Theoretically you can change this values manually, but this is not practical.
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Postby masterkielbaster » Mon Apr 30, 2007 7:11 am

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Postby Sven » Tue May 01, 2007 7:53 pm

Yes...

Internal camera parameters:

Ncx: [sel] Number of sensor elements in camera's x direction
Nfx: [pix] Number of pixels in frame grabber's x direction
dx: [mm/sel] X dimension of camera's sensor element
dy: [mm/sel] Y dimension of camera's sensor element
dpx: [mm/pix] Effective X dimension of pixel in frame grabber
dpy: [mm/pix] Effective Y dimension of pixel in frame grabber
Cx: [pix] Z axis interception of camera coordinate system
Cy: [pix] Z axis interception of camera coordinate system
sx: [] Scale factor to compensate for any error in dpx
f: [mm] Focal length of camera
Kappa1: coefficient for second order (nonlinear) lens distortion

Note: sx compensates for errors in dx, dy, because we do not really know the true value ==> f may also be a little bit off...


External camera parameters:

(tx, ty, tz) Translational parameters for transformation camera -> calib.body
(rx, ry, rz) Rotational parameters for transformation camera -> calib.body

r1...r9: Redundant, again Rotational parameters (here 3x3 rotation matrix values)

Camera coordinate system lies in center of camera , z-axis = viewing direction
Calib.body coordinate system can be seen in the pattern printout
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