Two-dimensional subband extraction and insertion

get_subband2d(M,l,m,n) Returns the result of extracting the (m,n)th subband of wavelet packet coefficients at level l from the 2-dimensional wavelet packet transform M.

put_subband2d(M,l,m,n,N) Returns the result of inserting the matrix N into the (m,n)th subband of wavelet packet coefficients at level l of the 2-dimensional wavelet packet transform M.

Arguments:

• M is an array having at least 2^l rows and columns.
• l is an integer.
• m and n are integers less than 2^l corresponding to the row number and column number of the subband to extract.
• N is a matrix. N is the same size as the matrix returned by get_subband2d.

Mathcad Example

Mathcad Example