Figure 1.

Facial landmarks i = 0, …, 7 whose 2D coordinates ${\overrightarrow{r}}_i$ constitute the face space (signaled with black circles). Their position in the figure correspond to the average position, $〈{\overrightarrow{r}}_i〉$. The background image corresponds to the texture degrees of freedom of the reference portrait. The blue lines are polar histograms h(ϕ) (the radius is proportional to h(ϕ)) corresponding to the experimental distribution of angle landmark fluctuations around their average position.