function?y?=?backsamp（y）
%?BACKSAMP????Backsampling?the?subband?images?of?the?directional?filter?bank
%
%???y?=?backsamp（y）
%
%?Input?and?output?are?cell?vector?of?dyadic?length
%
%?This?function?is?called?at?the?end?of?the?DFBDEC?to?obtain?subband?images?
%?with?overall?sampling?as?diagonal?matrices
%
%?See?also:?DFBDEC

%?Number?of?decomposition?tree?levels
n?=?log2（length（y））;

if?（n?~=?round（n））?|?（n?????error（‘Input?must?be?a?cell?vector?of?dyadic?length‘）;
end

if?n?==?1
????%?One?level?the?decomposition?filterbank?shoud?be?Q1r
????%?Undo?the?last?resampling?（Q1r?=?R2?*?D1?*?R3）
????for?k?=?1:2
	y{k}?=?resamp（y{k}?4）;
	y{k}（:?1:2:end）?=?resamp（y{k}（:?1:2:end）?1）;
	y{k}（:?2:2:end）?=?resamp（y{k}（:?2:2:end）?1）;	
????end????
????
elseif?n?>?2????
????N?=?2^（n-1）;
????
????for?k?=?1:2^（n-2）
	shift?=?2*k?-?（2^（n-2）?+?1）;
	
	%?The?first?half?channels
	y{2*k-1}?=?resamp（y{2*k-1}?3?shift）;
	y{2*k}?=?resamp（y{2*k}?3?shift）;
	
	%?The?second?half?channels
	y{2*k-1+N}?=?resamp（y{2*k-1+N}?1?shift）;
	y{2*k+N}?=?resamp（y{2*k+N}?1?shift）;	
????end
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????2390??2003-11-12?23:50??ChangeLog
?????文件????????5127??2003-11-05?00:10??computescale.m
?????文件????????3537??2003-11-11?10:45??Contents.m
?????文件?????????706??2003-11-11?11:41??COPYING
?????文件????????3437??2003-11-10?12:22??decdemo.m
?????文件????????2472??2003-11-13?00:17??denoisedemo.m
?????文件????????2223??2003-11-05?22:44??dfbdec.m
?????文件????????1768??2003-11-05?23:54??dfbdec_l.m
?????文件????????1748??2003-11-05?08:11??dfbimage.m
?????文件????????2012??2003-11-10?00:52??dfbrec.m
?????文件????????1736??2003-11-06?00:18??dfbrec_l.m
?????文件????????2729??2003-11-06?10:39??dfilters.m
?????文件?????????755??2003-04-10?10:30??dup.m
?????文件????????1103??2003-04-10?10:30??efilter2.m
?????文件????????1861??2003-11-05?22:25??extend2.m
?????文件????????2098??2003-04-10?10:30??fbdec.m
?????文件????????1507??2003-11-06?10:41??fbdec_l.m
?????文件????????2360??2003-04-10?10:30??fbrec.m
?????文件????????1426??2003-11-06?00:23??fbrec_l.m
?????文件?????????485??2003-04-10?10:30??ffilters.m
?????文件?????????856??2003-04-10?10:30??ld2quin.m
?????文件?????????662??2003-11-05?08:17??ldfilter.m
?????文件?????????722??2003-09-13?02:30??lpdec.m
?????文件?????????935??2003-09-13?02:48??lprec.m
?????文件?????????882??2003-11-05?08:19??mctrans.m
?????文件?????????775??2003-04-10?10:30??modulate2.m
?????文件????????5507??2003-11-10?18:07??nlademo.m
?????文件????????1238??2003-11-11?10:26??nlademo2.m
?????文件????????1254??2003-11-12?23:43??pdfb2vec.m
?????文件?????????931??2003-11-13?00:25??pdfb_nest.m
?????文件????????1254??2003-11-13?00:09??pdfb_tr.m
............此處省略34個(gè)文件信息