Research on Test Conditions of Sealed-Relay Remainders Based on High-Speed Video Technology - Intelligent Computing for Sustainable Energy and Environment - page 510

The location extraction of the cavity wall is one of the difficulties in the proposed
system. The scattering of light during high-speed shooting can cause significant
interference; the uneven of the cavity surface can also influence the extraction effect.
We have done a number of comparative experiments and choose the Hough transform
as the straight-line extraction method. The Hough transform can convert the image
from image space to Hough parameter space, and extract straight lines based on the
Point-line duality between the two spaces [14-15]. The Typical result of cavity wall
extraction is shown in Figure 7.The time interval of shot is known, thus the movement
parameters include displacement, velocity and acceleration can be calculated by
comparing two adjacent-remainder moving images. The calculating process of
remainder movement parameters is shown in Figure 8.

Fig. 7. cavity wall extraction Fig. 8. Calculating process of remainder

movement parameters

2.3 The Performance Validation of the Proposed Method

The main function of the proposed method is to locate the remainders and test objects
and calculate the motion parameters. The performance can be verified by comparing
the automatic processing results and manual measurements. Assume the diameter of
remainder is R and the distance between remainders and sealed cavity is h . We carried
out the validation of these two parameters. The results are shown in Table 2 and 3.

Table 2. Performance verification of R (mm)

measured values
actual values

1 2 3 4 5 6 7 8 9 10

1.0 (mm)
1.5 (mm)
2.5 (mm)

1.02
1.50
2.55

0.96
1.53
2.56

1.03
1.52
2.48

1.02
1.48
2.50

0.99
1.50
2.43

0.98
1.49
2.55

1.02
1.52
2.46

1.00
1.51
2.53

1.00
1.50
2.44

1.03
1.46
2.53