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HOW CAN I WRITE THE INVERSE FUNCTION OF PERIODIC PLUS SMOOTH DECOMPOSITION. I HAVE TAKEN A 360*360 MATRIX AND DIVIDED IT INTO 90 BLOCKS THEN PERFORMED DECOMPOSITION ON EACH

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sabitri
sabitri 2022-8-10
function [p1,s] = perdm_fun(b)
[ny,nx] = size(b);
b = double(b);
X = 1:nx; Y = 1:ny;
v = zeros(ny,nx);
v(1,X) = b(1,X)-b(ny,X);
v(ny,X) = -v(1,X);
v(Y,1 ) = v(Y,1 )+b(Y,1)-b(Y,nx);
v(Y,nx) = v(Y,nx)-b(Y,1)+b(Y,nx);
fx = repmat(cos(2.*pi*(X -1)/nx),ny,1);
fy = repmat(cos(2.*pi*(Y'-1)/ny),1,nx);
fx(1,1)=0.; % avoid division by 0 in the line below
s = real(ifft2(fft2(v)*0.5./(2.-fx-fy)));
p = b-s;
%pmod = reshape(p.',1,[]);
%list=knuthShuffle(pmod);
%p1=reshape(list,4,4);
I want to perform inverse decomposition and get blocks as output...As i am a new comer in this field i can't find any way. hope to get help. I am getting b from this code:
mat=4*ones(1,90);
newRow = zeros(1,size(F3,2));
newF3 = [F3(1:359, :); newRow; F3(360:end, :)];
H=mat2cell(newF3,mat,mat);
%for i=1:90
%M=cellfun(@str2double, H);
%end
for i=1:90
for j=1:90
celmat=zeros(4);
b=(H{i,j});
% bmod = reshape(b.',1,[]);
% list=knuthShuffle(bmod);
% b1=reshape(list,4,4);
[p,s] = perdm_fun(b); end
end

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