Master Thesis - Fachbereich Informatik

5.3. EXPERIMENTAL RESULTS 127
Color Ltarget ΩPTM µseq µGT σseq σGT
(a) Black 30 3.43 30.06 30.06 0.09 0.08
(b) Transparent 30 3.18 30.07 30.06 0.12 0.08
(c) Black 70 6.12 69.76 69.76 0.14 0.16
(d) Transparent 70 4.85 70.21 70.21 0.27 0.20
Table 5.8: Results of 30mm and 70mm tubes at 30m/min. Ltarget represents the target
length and ΩPTM the average number of per tube measurements. The mean and standard
deviation of the length measuring distributions are denoted as µseq and σseq for the automated,
and µGT and σGT for the human measurements respectively. The results are also visualized
in Figure 5.21.
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69 69.5 70 70.5 71
Length [mm]
(c) 70mm black
Measurement distribution
Ground truth distribution
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Measurement distribution
Ground truth distribution
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(d) 70mm transparent
Figure 5.21: Length distribution of 30mm and 70mm tubes at 30m/min for automated (solid
line) and manual measurements (dashed line). All experiments show a very good accuracy, i.e.
the vision system measures the same length on average. Black tubes are generally measured
slightly more precise than transparent tubes. The vision system is even more precise at 70mm
black tubes than human measurements.