function B = dftopm2d(K,N)%DFTOPM2D generates a DFT operator matrix B such that the discrete 2D-Fourier%  transform of a spatial matrix x is given by X = reshape(B*x(:),M,M).%  The DFT is defined in the same way as the Matlab standard fft2.% %  B = dftopm2d(N,M)B%  K = # spatial samples. x is (K x K).%  N = # frequency samples. X is (N x N).%%See Also%  dftopm, dftmtx%   *  DBT, A Matlab Toolbox for Radar Signal Processing  *% (c) FOA 1994-2000. See the file dbtright.m for copyright notice.%%  Start        : xxxxxx Svante Bj鰎klund (svabj).%  Latest change: $Date: 2000/10/16 15:40:10 $ $Author: svabj $.%  $Revision: 1.3 $% *****************************************************************************if (nargin < 2)  N = K;end;  B1=dftopm(K,N);B = kron(B1,B1);