Fig. 12

a A number of optimally fit contours of “ε” realizations, forming a bundle\({\mathrm{RB}}_{1,\mathrm{M}}^{\varepsilon ,\mathrm{i}}\), where now, all involved curves consist of the same number of pixels, while they remain closed. b An ensemble of optimally fit contours of “ρ” realizations. They form two (2) sub-bundles: first, the \({RB}_{1,M}^{\rho ,i}\) one, shown in blue, that corresponds to the outer contour of each letter realization, all consisting of the same number of pixels, namely\({\mathrm{L}}_{1}^{\uprho ,\mathrm{i}}\). Similarly, the sub-bundle\({RB}_{2,M}^{\rho ,i}\), shown in green, includes the internal contours\({\Gamma }_{2,M}^{\rho ,i}\), having the same number of pixels\({\mathrm{L}}_{2}^{\uprho ,\mathrm{i}}\). c An analogous bundle of optimally fit “θ” contours. The external closed contours\({R\Gamma }_{1,M}^{\theta ,i}\), shown in blue, share the same number of pixels \({\mathrm{L}}_{1}^{\theta ,\mathrm{i}}\); similarly, the same holds true for the internal contours corresponding to\(\rho =2\), which are shown in green, and\(\rho =3\), shown in magenta