“…We have to minimize the functional (4), the aim is to minimize the difference between current and desired magnitude response of the 2-D filter in N 1 ×N 2 points. Since the denominator only contains first-degree factors, we can asseverate the stability conditions as the constraints [1,3]. It is renowned also that a linear, causal, shiftinvariant, single-input, single-output, discrete variables 2-D system is BIBO (Bounded Input Bounded Output) stable if and only if its output is bounded when the input is bounded and the initial conditions are zero.…”