Image Engineering GEOCAL User Manual page 11

Nevertheless, they can, for example, be set to zero for troubleshooting.
•
Analysis Parameter: angles Omega (roll), Phi (pitch), Kappa (yaw)
These angles describe the device's orientation under test to the diffractive optical element.
These values are determined during calibration and output as results. Nevertheless, they can be
set to a fixed value for troubleshooting.
•
Analysis Parameter: Radial Distortion Coefficients 1-5
The radial distortion coefficients model this type of distortion. The distorted points are denoted as:
x = x(1 + k
distorted
y = y(1 + k
distorted
These values are determined during calibration and output as results. However, they can be set
to a fixed value for troubleshooting.
•
Analysis Parameter: Tangential Distortion Coefficients 1+2
The tangential distortion coefficients model this type of distortion. The distorted points are
denoted as:
x = x + [2p
distorted
y = y + [p
distorted
These values are determined during calibration and output as results. However, they can be set
to a fixed value for troubleshooting.
•
Analysis Parameter: Focal Length X and Y
The focal length values of the device under test in X and Y are determined during calibration and
output as results in pixel dimensions. Nevertheless, they can be set to a fixed value for
troubleshooting.
•
Analysis Parameter: Skew coefficient
The skew coefficient is set to 0 by default and is non-zero if the image axes are not
perpendicular.
•
Analysis Parameter: Principal Point
The principal point (optical center) describes the point where the optical axis of the camera lens
intersects the image sensor. It is determined during calibration and output as a result.
Nevertheless, it can be set to a fixed value for troubleshooting.
To make changes to the standard config file, open it in a text editor. It is advised to make a copy of the
standard version before editing it.
Version:
<Configuration Version="3"
Installing the latest software always installs the latest configuration file. Make sure that you always use
the latest version. The latest version of the configuration file is "2".
Editing Control Parameters:
Example:
<MinF Use="false">0.1</MinF>
The "Use" flag indicates if the following value is used for the calibration procedure. If it says "false," it is
not used, and the standard value is used instead. To use a custom value, write "true" instead of "false"
and change the value ("0.1" in this example) as desired. The new value will be used in every calibration
until you set the "Use" flag back to "false" again.
Image Engineering
2 4 6
*r + k *r + k *r + k
1 2 3 4
2 4 6
*r + k *r + k *r + k *r
1 2 3 4
xy + p (r² + 2x²)]
1 2
(r² + 2y²) + 2p xy]
1 2
Description="Translation">
8 10
*r + k *r )
5
8 10
+ k *r )
5
Seite 11 von 19