Calculating The Surface Profile - Baumer OX200 Operating Manual

Baumer
9.2.5

Calculating the surface profile

Setting the parameters of the algorithm
The web interface offers you the option of adjusting the parameters of the algorithm that is used
to calculate the profile graph. The parameters define how the algorithm extracts the profile point
from the camera image. The camera image contains several pixels with varying intensity. The
algorithm calculates a single value (the center of gravity) from several pixels found in the cam-
era image. The algorithm uses several parameters to assess which pixels to use and which
pixels to ignore.
To set the parameters of the algorithm, proceed as follows:
Condition:
ð The Expert Mode is activated (see
Instruction:
a) In the menu, select the Parametrization | Global Parametrization mode.
b) In the Global Parameters window, proceed to Data Acquisition | Profile Computation.
c) In the drop-down list next to Algorithm, select the desired basic type, which can help ac-
complish more stable results, especially in case of reflections.
The following basic types are available:
Standard:
n
In the Standard setting with several peaks along a column, the peak with the greatest in-
tensity is always used.
Upper CoG:
n
In the Upper CoG setting with several peaks along a column, the top peak is always used.
Lower CoG:
n
In the Lower CoG setting with several peaks along a column, the bottom peak is always
used.
Setting the parameters for accumulating adjacent pixels
Within the above-stated basic types, you can carry out detailed adjustments with the help of the
following parameters. These parameters determine whether adjacent pixels are accumulated as
a common peak:
Min. Peak Height:
n
• Minimum height of a peak to be detected in relative units.
Min. Peak Width:
n
• Number of adjacent pixels that must be above the Pixel Threshold value.
Pixel Threshold:
n
Threshold below which the pixels are ignored. The value is given in %. Depending on your
choice, this is either a percentage of the maximum possible signal (255) or, as a function of
the contrast of the peaks, relative to the background.
Smoothing the profile/filters
With profile smoothing, profile points are averaged with the respective adjacent profile points.
This can reduce spatial noise, which can be caused, for example, by the structure of the surface
or by speckle patterns. You can set the profile smoothing within the Profile Computation area
via Filter.
OX200 | V2
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Operating Manual
Web interface operation | 9
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