ABSTRACT
The function q() in Equation (10.1) is the quadric q(s, t, r) = As2 + 2Bst +2Csr + 2 D s + Et2 +2Ftr +2Gt + Hr2 + 2 I r + J
which can be also represented as
g(s) = sTQs [str 1] A B C D B E F G C F H I D G I J
(10.3)
using a homogeneous 4 × 4 matrix of coefficients [20]. This classification function allows texture grains to be modeled as concentric spherical or cylindrical shells.
