I haven't fully understand how the qtdecomp works…
I = [1 1 1 1 2 3 6 6 1 1 2 1 4 5 6 8 1 1 1 1 10 15 7 7 1 1 1 1 20 25 7 7 20 22 20 22 1 2 3 4 20 22 22 20 5 6 7 8 20 22 20 20 9 10 11 12 22 22 20 20 13 14 15 16];S = qtdecomp(I,2);disp(full(S));
The answer is like this:
4 0 0 0 1 1 2 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 2 0 0 0 0 0 1 1 0 0 4 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
in the left bottom 4*4 matrix, maximum value(22) of the block elements minus the minimum value(20) is 2, so when decomposition this part, it will left as it is.
when I do this on a uint8 matrix:
I = uint8([1 1 1 1 2 3 6 6 1 1 2 1 4 5 6 8 1 1 1 1 10 15 7 7 1 1 1 1 20 25 7 7 20 22 20 22 1 2 3 4 20 22 22 20 5 6 7 8 20 22 20 20 9 10 11 12 22 22 20 20 13 14 15 16]);S = qtdecomp(I,2/255);disp(full(S));
the answer is just like before. but when I change S to this:
S = qtdecomp(I,1.9/255);
The answer is
4 0 0 0 1 1 2 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 2 0 0 0 0 0 1 1 0 0 4 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
I suppose the left bottom 4*4 matrix should decompose, but why it doesn't?
Best Answer