Tt

0 otherwise,

A tensor T describing local structure is obtained by a linear summation of quadrature filter magnitude responses, \qk |, weighted by predefined tensors Mk, associated with each filter (defined as the dual tensors in Eq. 44):

where lqk l is the output magnitude from the quadrature filter k.

The tensor in Eq. (53) is real and symmetric and can thus be written as a weighted sum of outer products of its orthogonal eigenvectors:

0 0

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