Hi Konstantina,
Yes, you can apply a 3D Discrete Cosine Transform (DCT) to a 3D matrix without using “mirt_dctn”. This can be done by applying a 1D DCT sequentially along each dimension. To achieve this, use the “dct” function present in Signal Processing Toolbox. Here’s an example of how to apply a 3D DCT manually:
A = rand(4, 4, 4); % Assuming a sample 3D matrix
% Applying 1D DCT along each dimension separately
A_manual = dct(A, [], 1);
A_manual = dct(A_manual, [], 2);
A_manual = dct(A_manual, [], 3);
disp('Manual 3D DCT:');
disp(A_manual);
To know more about “dct”, refer to the following MathWorks documentation link:
