 It affects the amount of storage needed, and also affects the amount of computation.The frequency response of a multi-dimensional filter is given by,

formula_174

where formula_8 is the impulse response of the designed filter for size formula_176

The frequency response of the ideal filter is given by

formula_177

where formula_178 is the impulse response of the ideal filter.The error measure is given by subtracting the above two results i.e.