113
ifm Vision Assistant O3M
UK
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Result type "percentile":
For the result type "percentile", the percentile value can be
set .
A percentile is, like the quantile, a threshold value, but
in case of the percentile, the distribution is given as a
percentage . The result type "percentile" helps when
answering the question "What percentage of the pixels
have a lower or identical value?" .
The result type "percentile" has the following values:
●
robust against ouliners
●
scales with different pixel quantities of the ROI group
●
enables a primitive statistical evaluation of the pixel
quantity . For example, by placing two superimposable
ROIs with different percentile values (25% and 75%):
●
the pixel dispersion can be estimated,
●
outliners can be detected .
By clicking on the arrow
on the right next to the
percentile value, a list with typical values opens .
Use the "Percentile" result type only if the object of
interest consists of more than one pixel .
x
②
1 m
0 m
2 m
3 m
①
y
Exemplary applications for the result type "percentile":
The distance between wall
①
and wall
②
is to be defined
(see figure on the left) .
For wall
①
, the percentile value "1st quantile 25 %" is
used .
For wall
②
, the percentile value "3rd quantile 75 %" is
used .
The result type "percentile" calculates the correct distance
between the walls with an error rate of <1 % .
If you try to approximate the result via the min/max
values, an error rate of ~50 % is possible .
