Table 2: The test results of the visual calibration.

RegionsCalibration coordinate (mm)Actual coordinate (mm)Absolute error (mm)

The visual calibration of the sealing port

P1(27.17, −243.74)(27.6, −244.67)(−0.43, 0.93)
(21.94, −352.85)(22.35, −353.75)(−0.41, 0.90)
(29.48, −328.03)(29.98, −328.97)(−0.5, 0.94)

P2(116.93, −315.76)(117.17, −316.06)(−0.24, 0.30)
(150.01, −315.94)(149.68, −316.22)(0.33, 0.28)
(148.2, −279.45)(148.16, −279.6)(0.04, 0.15)
(165.83, −301.86)(165.83, −301.86)(0.38, 0.41)

P3(253.56, −243.24)(253.1, −244.84)(0.46, 1.60)
(251.34, −390.43)(250.77, −391.66)(0.57, 1.23)
(291.22, −248.72)(290.59, −249.97)(0.63, 1.25)

The visual calibration of the sealing ring

G(347.68, 44.39)(347.84, 44.21)(−0.16, 0.18)
(361.89, 50.03)(361.69, 50.31)(0.2, −0.28)
(373.35, 29.82)(372.98, 29.73)(0.37, 0.09)
(364.62, 34.43)(364.38, 34.22)(0.24, 0.21)
(375.87, 20.08)(375.51, 20.00)(0.36, 0.08)
(392.26, −19.59)(391.95, −19.17)(0.31, −0.42)
(323.7, 65.59)(323.44, 65.32)(0.26, 0.27)
(331.09, 13.57)(331.44, 13.79)(−0.35, −0.22)