Dear all, I am trying to design the 2-D fir filter. i am using the meshgrid command and calculating the frequencies. it returns with the values of certain dimension, for eg, meshgrid(9) it returns the 9x9 matrix value. can anyone explain why we need to take all these 9x9 values.In the 1-D we will be using only one frequency vector, but in 2-D is it necessary to take as such. can anyone suggests what significance it adds, and also about the coefficienst ,all rows for linear phase exhibit certain behaviour with varying coefficients, why it is so. what significance does it adds can anyone explain this and help me i am thankful for it. regds,sree. |
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2-D filter matrix
Started by ●January 30, 2003
Reply by ●February 1, 20032003-02-01
Hi, I am not sure whether I got your question right. Let me try. In 2D you have frequencies along x-axis AND y-axis. They need not be same. So you need a matrix to represent all the frequencies. A value in 2D frequency response A(i,j) gives the amplitude for an x freqeuncy =i and y-frequency=j. So 1-D vector is not enough to represent the 2D frequency response. For a linear phase filter the coefficients are symmetric or antisymmetric. You can quickly verify this using Z-transform. Navan --- Appalayagari Sreedhar <> wrote: > Dear all, > > I am trying to design the 2-D fir filter. i am using > the meshgrid command and calculating the > frequencies. it returns with the values of certain > dimension, > > for eg, meshgrid(9) > > it returns the 9x9 matrix value. > > can anyone explain why we need to take all these > 9x9 values.In the 1-D we will be using only one > frequency vector, but in 2-D is it necessary to take > as such. > > can anyone suggests what significance it adds, > > and also about the coefficienst ,all rows for linear > phase exhibit certain behaviour with varying > coefficients, why it is so. what significance does > it adds > > can anyone explain this and help me i am thankful > for it. > > regds,sree. __________________________________________________ |