MatLab Solutions: "Introduction to Digital Signal Processing: A Computer Laboratory Textbook".
29 Oct 2012
25 Nov 2013)
These files are the MatLab solutions of exercises contained in the above DSP lab textbook.
% Two-dimensional DCT computation.
% Input X is an arbitrary real or complex data matrix.
% Output Y is its 2D-DCT transform.
% 2D DCT is useful for sparse representation and compression of digital
% images. It finds extensive application in the jpeg image formats.
function Y = my_DCT_2D(X)
[rows cols] = size(X);
X1 = zeros(rows,cols);
Y = zeros(rows,cols);
% Compute the DCT row-wise:
X1(i,:) = my_DCT(X(i,:));
% Because of the 2D-FFT separability, now
% compute the FFT column-wise on matrix x1:
Y(:,j) = my_DCT(X1(:,j));