C2 Series User Manual Rev. 1.9
23
The FIR Filter Function
The FIR filter is a signal processing function aiming to increase the precision of laser line detection in
the sensor image. It consists of a digital Finite Impulse Response filter (FIR) and can be operated in a
smoothing or differentiating mode.
FIR in smoothing mode (in combination with MAX, TRSH and COG algorithms):
FIR in differentiating mode (FIR PEAK):
Pre-defined templates with 5, 7 or 9 coefficients let the FIR filter to be customised to the Gauss size
and shape of the application.
More details regarding the operation of the FIR filter function can be found in a
separate application note.
Raw Gauss Curve
Smoothed Gauss Curve
Zero-Crossing of
First Derivative
