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% [LEV,IND] = spyrBand(PYR,INDICES,LEVEL,BAND)
%
% Access a band from a steerable pyramid.
%
% LEVEL indicates the scale (finest = 1, coarsest = spyrHt(INDICES)).
%
% BAND (optional, default=1) indicates which subband
% (1 = vertical, rest proceeding anti-clockwise).
% Eero Simoncelli, 6/96.
function res = spyrBand(pyr,pind,level,band)
if (exist('level') ~= 1)
level = 1;
end
if (exist('band') ~= 1)
band = 1;
end
nbands = spyrNumBands(pind);
if ((band > nbands) | (band < 1))
error(sprintf('Bad band number (%d) should be in range [1,%d].', band, nbands));
end
maxLev = spyrHt(pind);
if ((level > maxLev) | (level < 1))
error(sprintf('Bad level number (%d), should be in range [1,%d].', level, maxLev));
end
firstband = 1 + band + nbands*(level-1);
res = pyrBand(pyr, pind, firstband);