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Table 2 Measured average step height of Experiment 4 at 60, 50, 30 (unit: mm)

From: Three-dimensional measurement of object surface by using ellipse binary defocusing projection

Number 1 2 3
Ideal height 60 50 30
Measured height 60.078 49.949 30.031
Absolute error 0.078 0.051 0.031
RMS error 0.025 0.018 0.011