Spot operator: opDCT2 Spot Home Page
opDCT2
 opDCT2  Two-dimensional discrete cosine transform (DCT).
 
    opDCT2(M,N) creates a two-dimensional discrete cosine transform
    operator for matrices of size M-by-N. Input and output of the
    matrices is done in vectorized form. When N is omitted it is set
    to M by default.