From these equations it follows that::formula_10or:formula_11which results in:formula_12where formula_13 are the formula_14 and formula_15 components of the velocity or optical flow of formula_3 and formula_17, formula_18 and formula_19 are the derivatives of the image at formula_2 in the corresponding directions.
: formula_10: formula_11: formula_12:formula_13 — компоненты скорости оптического потока в formula_4,:formula_15, formula_16, formula_17 — производные изображения в formula_18 в соответствующих направлениях.