Is posible to use "DCT" on general matrix data?

Question

N K 2012-2-13

编辑： Cedric 2013-10-11

Dear all.

I have some problem to ask you about DCT processing on matrix data.

I can find only dct for image processing only, but no for matrix processing.

for example

I have a matrix like

          1 2 3 1
          4 5 6 2
          7 8 9 3
**** This matrix is not Image matrix.

So, if I want to do DCT on this matrix to reduce from 3X4 to 3X1.

Is it possible to do?

Best.

Answer 1

Wayne King 2012-2-13

You can use dct2() from the Image Processing Toolbox on a matrix.

X = randn(16,16);
Y = dct2(X);

You do not tell us what you are trying to use for the DCT, but I'm guessing from the error message that you are not using a MathWorks' function.

N K 2012-2-14

I want to use MathWork's function. But most of DCT function in matlab is design for image processing.

I think it doesn't match for matrix process which not in image processing.

If I am wrong, could you mind to explain it to me.

Best.