Two Dimensional filters

Hi, I need to find the coefficients of a 2 dimensional 4*4 4th order filter. How can this be achieved in Matlab?

Answer 1

[Wayne King]

You can construct a 1-D 4th order FIR filter and then create a 2-D separable filter out of that. That is one possibility.

       h = fir1(3,0.25,'low');
       h = h'*h;
       freqz2(h)

Or use fwind1 directly.

There are many other possibilities.