5 Functionality
5.2.3
Laser Line Detection
The laser line detector takes two threshold values as its input, a signal threshold and a width
threshold. They fulfill the following purposes:
•
All pixels with grey value below the signal threshold value will be ignored. This filters out
the image background.
•
The width threshold is used in the calculation of the laser line width (see below). It has to
be higher than (or equal to) the signal threshold.
The following output values are calculated column wise (see also Fig. 5.5):
Peak coordinate
Vertical coordinate of the laser line peak
Laser line width
The laser line width is the number of pixels that have a grey value above the
width threshold around the laser peak. If there are no pixels at the peak position that are
above the width threshold, the resulting laser line width is 0. In this case the width
threshold value should be changed.
Laser line height
In order to suppress noise, the laser line height is the mean value between
the two pixels surrounding the peak position. Depending on the shape of the peak, this
may not result in the maximum peak value.
The value of the threshold should be set slightly above the grey level of the im-
age background. The width threshold value should be set so that the maximum
peak width of 63 is not exceeded too often.
W
i d t h
In
te
n
s
it
y
y - d i r e c t i o n
H e i g h t
G a u s s i a n s h a p e d
l a s e r l i n e
T h r e s h o l d
W
i d t h T h r e s h o l d
Figure 5.5: Schematic of the cross section of a laser line
.
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MAN075 05/2017 V1.0
Summary of Contents for MV1-D2048-3D06 series
Page 10: ...1 Preface 10 of 127 MAN075 05 2017 V1 0...
Page 12: ...2 Introduction 12 of 127 MAN075 05 2017 V1 0...
Page 26: ...3 How to get started 3D GigE G2 26 of 127 MAN075 05 2017 V1 0...
Page 32: ...4 Product Specification 32 of 127 MAN075 05 2017 V1 0...
Page 66: ...5 Functionality 66 of 127 MAN075 05 2017 V1 0...
Page 82: ...6 Precautions 82 of 127 MAN075 05 2017 V1 0...
Page 120: ...12 Support and Repair 120 of 127 MAN075 05 2017 V1 0...
Page 122: ...13 References 122 of 127 MAN075 05 2017 V1 0...