Chapter
1
Reference Manual
Ruler E
Overview
1.2
Measurement Methods
When configuring the Ruler for measurement, you can choose any of the camera’s built-in
measurement methods – or
components
:
HorThr
Horizontal threshold
, a fast method for measuring range values using one
or two thresholds.
HorMax
Horizontal max
, measures the maximum intensity of the laser, and de-
termines the position of the maximum intensity.
HorMaxThr
Horizontal max and threshold
, measures range values using one thresh-
old, and measures the maximum intensity of the laser.
Hi3D
High-resolution 3D
, measures range values with high resolution, as well
as the maximum intensity. Can also measure scatter when used with a
Ruler with Scatter option.
Figure 1.4 – Threshold locates the laser in each column of the sensor image by searching
for intensities above a certain level, while Max searches for the maximum intensity in each
column.
Which component to use is of course depending on what to measure – range, intensity or
scatter – but also on the required speed and resolution of the measurements, as well as
the characteristics of the objects to measure and the conditions in the environment.
For each measurement method, there are a number of parameters that can be changed
for further fine-tuning the quality and performance of the measurements. These parame-
ters specifies for example exposure time and in which area of the image to search for the
laser line.
Columns
Rows
Projected
laser line
Sensor image
Columns
Columns
Threshold
Max
Rows
Rows
Intensity
Intensity
HorThr HorMax
8
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