Device description
Leuze electronic
LES 36
27
TNT
35/7-2
4
V
Figure 4.6:
Edge detection with EAWs
4.3.3
Definition of EAWs and their analysis results
Edge detection
Edge detection with the LES is possible if the following prerequisites are met:
There are enough successive measurement points in the EAW at both the right and the left
edge. This serves the plausibility of the edge detection.
Edges are only detected if the number of successive measurement points is greater
than or equal to the defined minimum number of measurement points (Sequent Hits).
If there are not enough successive measurement points in an EAW, no edge detection
and no object measurement is possible within this EAW.
Configuration of the edge detection in EAWs is performed with
LESsoft
(
Edit Analysis
Windows
->
Edge Detection Definitions
).
Note!
If there are not enough successive measurement points on the edges of an EAW, the found
edge positions are shifted away from the edges of the EAW (see Figure 4.7, different right
edge position with different parameters for Sequent Hits).
Z
+X
-X
O1
EAW01
H
W
LES
Measurement range
Object
Measurement points
H = height difference of two edges
W = object width
Edge Analysis Window
EAW
x axis
z a
x
is
No object detection due to
shadowing in the measure-
ment range
Right edge
(coordinates RX, RZ)
Left edge
(coordinates LX, LZ)
Conveyor path
