Fig. 2From: Robust and precise algorithm for aspheric surfaces characterization by the conic sectionThe convergence of relative error of R and k for 5 cases from [3] as a function of the number of iteration index (the polynomial degree was selected the same as the degree of designed A 2i in each individual case). An example for case 2 with the initial value of k within 1% (hollow triangles)Back to article page