Figure 11From: A sub-Riemannian model of the visual cortex with frequency and phaseLeft: The result of our multifrequency Laplace–Beltrami procedure applied on an image taken from [47] (see also Fig. 10). Middle: The result of the single-frequency Laplace–Beltrami procedure with \(\omega =1.91\). Right: The result of the single frequency Laplace–Beltrami procedure with \(\omega =2.19\)Back to article page