kdu_resolution::get_dwt_level

Gets the DWT level index associated with the subbands used to build this resolution from the next lower resolution. If no DWT is used, the function returns 0. Otherwise, the highest resolution level returns 1, the next one returns 2 and so forth. The two lowest resolution objects both return the total number of DWT levels, since they hold, respectively, the LL subband and the HL,LH,HH subbands at the bottom of the DWT decomposition tree. The function is most useful for implementations of the DWT.