How to center data on the max value

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Ole
Ole il 28 Ago 2021
Commentato: Ole il 28 Ago 2021
How to center 2D matrix (NxM) on the pixel with max value and fill rest with zeros?
The end result should be (NxM) with centered max.
x = -2:0.5:2;
y = 1:0.2:2;
[X,Y] = meshgrid(x,y);
Z = peaks(X,Y)
[row, col] = find(ismember(Z, max(Z(:))));
N = length(x);
M= length(y);
row = row(1);
col = col(1);
if row > N/2 && col > M/2
Z(1:(N/2-row),:) = [];
Z = [Z; zeros((N/2-row),M)];
Z(1:(M/2-row),:) = [];
Z = [Z; zeros((M/2-row),N)];
elseif row < N/2 && col < M/2
Z(:,end-(N/2-col):end) = [];
Z = [zeros(M,(N/2-col)) Z];
Z(:,end-(M/2-col):end) = [];
Z = [zeros(N,(M/2-col+1)) Z];
elseif row > N/2 && col < M/2
Z(1:(N/2-row),:) = [];
Z = [Z; zeros((N/2-row),M)];
Z(:,end-(M/2-col):end) = [];
Z = [zeros(N,(M/2-col+1)) Z];
elseif row < N/2 && col > M/2
Z(:,end-(N/2-col):end) = [];
Z = [zeros(M,(N/2-col)) Z];
Z(1:(M/2-row),:) = [];
Z = [Z; zeros((M/2-row),N)];
else
Z = Z;
end

Risposta accettata

Matt J
Matt J il 28 Ago 2021
Without the Image Processing toolbox? With the toolbox, you can simply use imtranslate().
  3 Commenti
Matt J
Matt J il 28 Ago 2021
imtranslate does that by default. Example:
A=rand(100);
B=imtranslate(A,[30,40]);
montage({A,B},'Back','w','Bord',[2,10])
Ole
Ole il 28 Ago 2021
Thank you!

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