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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);
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