Fig. 6
From: Robust and precise algorithm for aspheric surfaces characterization by the conic section
The fitting errors of algorithm for the case 2 from [3] indicated as colours of points (two views in [mm]). The asphere is translated by 0.1 mm in all directions X, Y and Z and rotated by 0.1 rad and 0.2 rad for axes X and Y respectively. Ten randomly placed Gaussian imperfections were artificially added (with h = 0.05 mm or h = -0.05 mm and with s = 0.05 mm). The filter with factor 10σ filtered out these imperfections (holes in the surface)