Automation Technology MCS 1280 Series, User Manual

Page: 33 / 93

MCS Manual Rev. 1.4 31
Threshold Mode (TRSH)
In this mode the position of left (P
L
) and right (P
R
) edge of the laser beam profile are detected for
a given threshold value of intensity AOI_TRSH.
The position value of the laser line is approximated: P
TRSH
= (P
L
+P
R
) / 2. In order to simplify the
digital representation, the division over 2 is not performed and thus an integer representation
with one subpixel is realised. The evaluation of 1088 rows delivers a position range from 0 to
1087 pixels (11 bit).
In threshold mode the camera can output either the left and right threshold position separately
or the subpixel position (P
L
+P
R
) and the line width (P
R
-P
L
). Moreover, the maximum intensity value
can be optionally output.
The precision of the position calculation can be improved by enabling the smoothing mode of the
FIR filter of the camera.
AO I_TRSH
P
TRSH
P
L
P
R