Figure 3

Modeling the local grammage of a straight fiber: a) the core γ and the contour of the fiber model \(\gamma \oplus B_{R}\), b) the projection of the fiber model on the plane \({\mathbb{R}}^{2}\), c) the core convolved with the filter mask \(\kappa (x)\), d) the difference between projection and filtering. The filter response in x is the length ℓ of the core γ intersected with the circle divided by the area of the circle