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Table 1 Classification of surface types by coefficient r

From: Modeling of the high-performance PLD-based sectioning method for classification of the shape of optical object images

Shape of the longitudinal section

Factor values

Inaccuracy δr v

r s

r ˜ v

r v

1. Prism, cylinder

1

11/12 ≈ 0.92

1

1/12 ≈ 0.083

2. Pyramid, cone

1/4 = 0.25

2/3 ≈ 0.67

2/3 ≈ 0.67

0

3. Hemisphere

7/12 ≈ 0.58

7/9 ≈ 0.78

7/9 ≈ 0.78

0

4. Hemisphere with a base

3/4 = 0.75

5/6 ≈ 0.83

5/6 ≈ 0.83

0

5. Gaussoid

ln(4/3)/ln2 ≈ 0.415

8.66/12 ≈ 0.722

1/2 ln ≈ 0.721

≈ 0

1 / 2 π exp - x 2 + y 2 / 2