sbpzero reads the multi-level subband pyramid subband_pyramid1 (SBP format with L >= 1 in the header). Each subband starting with subband is zeroed and the resulting subband pyramid is written to subband_pyramid2.
subband is an integer ranging from 0 (the baseband) up to the maximum subband number of L * 3, which is the diagonal subband of the highest-resolution subband of the pyramid. The intermediate subbands are numbered in the order horizontal, vertical, diagonal, so that subbands 1, 2, and 3, are the horizontal, vertical, and diagonal subbands, respectively, of the lowest-resolution level, 4, 5, 6 are the horizontal, vertical, and diagonal subbands, respectively, of the next highest-resolution level, and so on. If the -z option is not specified, subband defaults to 1; i.e., all highpass subbands are zeroed and only the baseband is retained.