How to zero pad in frequency domain ?
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how to zero-pad in frequency domain?
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Naz
2011 年 10 月 14 日
You zeropad a matrix of frequency spectrum the same way you would zeropad any matrix. For example, if your frequency matrix is m*n and you want to add two rows of zeros at the top and bottom, you simply do:
x=zeros(2,n);
zeropaddedmatrix=[x;matrix;x];
which will result in
000000
000000
matrix
000000
000000
Now, how to zeropad a frequency spectrum is a different question and depends on the particular application, that is, how you want to alter your frequency spectrum.
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Greg Heath
2011 年 10 月 14 日
fft
fftshift
zeropad both ends %different for N odd and N even
ifftshift
ifft % interpolates original time function
Hope this helps.
Greg
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