1. A method for combining layers in a multi-layer bitstream, said method comprising: a) receiving a bitstream comprising encoded image coefficients and encoded block pattern (Cbp) information wherein said Cbp information identifies regions in said bitstream that comprise transform coefficients; b) decoding said Cbp information; c) parsing said bitstream by using said Cbp information to identify bitstream regions comprising transform coefficients; d) scaling first-layer transform coefficients in said bitstream to match a characteristic of a second-layer in said bitstream; e) adding said scaled, first-layer transform coefficients to second-layer transform coefficients to form combined coefficients in a combined layer; and f) calculating combined Cbp information for said combined layer wherein said combined Cbp information identifies regions in said combined layer that comprise transform coefficients.