源代码如下
function [U, V] = dftuv(M, N)
%DFTUV Computes meshgrid frequency matrices.
% [U, V] = DFTUV(M, N) computes meshgrid frequency matrices U and
% V. U and V are useful for computing frequency-domain filter
% functions that can be used with DFTFILT. U and V are both
% M-by-N.
% Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins
% Digital Image Processing Using MATLAB, Prentice-Hall, 2004
% $Revision: 1.3 $ $Date: 2003/04/16 22:30:34 $
% Set up range of variables.
u = 0:(M - 1);
v = 0:(N - 1);
% Compute the indices for use in meshgrid.
idx = find(u > M/2);
u(idx) = u(idx) - M;
idy = find(v > N/2);
v(idy) = v(idy) - N;
% Compute the meshgrid arrays.
[V, U] = meshgrid(v, u);function [U, V] = dftuv(M, N)
%D
