over a finite set of index pairs (the "window", typically for some m), and w[r] is a fixed "window weight" that depends on r, such that the sum of all weights is 1. The values are the partial derivatives sampled at pixel p; which, for instance, may be estimated from by by finite difference formulas.

The formula of the structure tensor can be written also as , where is the matrix-valued array such that

Interpretation

The importance of the

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