SICK LMS400, Онлайн руководство пользователя

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Online help
LMS400
Configuration
8011984/YSZ3/2016-02-04
© SICK AG · Germany · All rights reserved · Subject to change without notice
17
Chapter 3
Median filter
Note The median filter is not available if on the A
PPLICATION
device page the L
EVEL
C
ONTROL
option
was selected (see 3.2 “Application” on page 8 ).
The median filter reduces individual extreme values over the entire measurement line by
outputting the median for each measurement point (not: the mean/average) from a 3 × 3
matrix. The matrix comprises nine measured values: The distance values for the point and
its neighbouring points, as well as the distance values determined for these points in the
previous and subsequent scan.
How to activate the median filter:
3.6.2 Range filter
Note The range filter is not available if on the A
PPLICATION
device page the L
EVEL
C
ONTROL
option
has been selected (see 3.2 “Application” on page 8 ).
The range filter reduces the number of valid measured values by only outputting distance
values that are within a specific distance range. For other measured values the filter
delivers the distance value 0 and the remission value 0 as the result.
How to activate the range filter
:
3.6.3 Mathematical filter
The mean filter smooths the distance value. For this purpose the filter forms the arithmetic
mean over several scans. The number of scans can be configured.
Recommendation Use the mean filter together with the median filter. In this way individual outliers will be
smoothed in advance by the median filter.
How to activate the mean filter:
On this subject please read the section “Median filter” in the chapter “Product description”
of the LMS400 operating instructions.
 Open in the P
ROJECT TREE
, LMS400-XX00, P
ARAMETER
the device page F
ILTER
.
 Select there in the C
ONTOUR
area the option A
CTIVATE MEDIAN FILTER
.

Open in the P
ROJECT TREE
, LMS400-XX00, P
ARAMETER
the device page F
ILTER
.
 Select there in the R
ANGE
area the option A
CTIVATE RANGE FILTER
.
 In the M
IN
.
MEASUREMENT DISTANCE
field enter a value of at least 700 mm and maximum
3000 mm.
 Then in the M
AX
.
MEASUREMENT DISTANCE
field enter a value larger than the value in the
M
IN
.
MEASUREMENT DISTANCE
field and maximum 3000 mm.
On this subject please read in the LMS400 operating instructions chapter “Product
description” , section “Mean filter” .

Open in the P
ROJECT TREE
, LMS400-XX00, P
ARAMETER
the device page F
ILTER
.
 Select there in the M
ATHEMATICAL
area the option A
CTIVATE MEAN FILTER
.
 In the N
UMBER OF AVERAGED SCANS
field enter a value of at least 2 and maximum 100.