【matlab】頻域濾波函數paddedsize

【matlab】頻域濾波函數paddedsize

function PQ = paddedsize(AB,CD,~ )  
%PADDEDSIZE Computes padded sizes useful for FFT-based filtering.  
%   Detailed explanation goes here  
if nargin == 1  
    PQ = 2*AB;  
elseif nargin ==2 && ~ischar(CD)  
    PQ = QB +CD -1;  
    PQ = 2*ceil(PQ/2);  
elseif nargin == 2  
    m = max(AB);%maximum dimension  

    %Find power-of-2 at least twice m.  
    P = 2^nextpow(2*m);  
    PQ = [P,P];  
elseif nargin == 3  
    m = max([AB CD]);%maximum dimension  
    P = 2^nextpow(2*m);  
    PQ = [P,P];  
else   
    error('Wrong number of inputs');  

end