MIT Press

Table 2.

Measures used for quantification of dynamics matrix features.

Mean values

\sum_{x, y} f_{x, y} / k^{2}

Contrast*

\sum_{x, y} {(f_{x, y} - f_{x + 1, y + 1})}^{2}

Sharpness (Brenner operator)**

\sum_{x, y} {(f_{x + 2, y} - f_{x, y})}^{2} + {(f_{x, y + 2} - f_{x, y})}^{2}

Derived indirectly from the gray-level co-occurrence matrix.

Modified from Treeby et al. (2011).

f_x,y = f(x, y), the scalar value of the matrix at column x, row y. k is the number of rows in the matrix.