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????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1119??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\backsamp.m

?????文件?????177851??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\barbara.png

?????文件???????2390??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ChangeLog

?????文件???????5127??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\computescale.m

?????文件???????3537??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\Contents.m

?????文件????????706??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\COPYING

?????文件???????3435??2008-10-30?14:35??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\decdemo.m

?????文件???????2475??2006-12-26?20:56??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\denoisedemo.m

?????文件???????2223??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfbdec.m

?????文件???????1768??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfbdec_l.m

?????文件???????1748??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfbimage.m

?????文件???????2012??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfbrec.m

?????文件???????1736??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfbrec_l.m

?????文件???????2729??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dfilters.m

?????文件????????763??2008-10-30?15:07??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\dup.m

?????文件???????1103??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\efilter2.m

?????文件????????225??2006-12-26?17:43??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ex1.asv

?????文件????????225??2006-12-26?17:46??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ex1.m

?????文件????????404??2006-12-26?20:25??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ex2.m

?????文件???????3259??2008-10-30?11:25??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\extend2.m

?????文件???????2098??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\fbdec.m

?????文件???????1507??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\fbdec_l.m

?????文件???????2360??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\fbrec.m

?????文件???????1426??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\fbrec_l.m

?????文件????????485??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ffilters.m

?????文件???????8105??2006-12-26?20:15??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\hs_err_pid1228.log

?????文件????????856??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ld2quin.m

?????文件????????662??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\ldfilter.m

?????文件????????692??2008-10-27?19:49??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\lpdec.m

?????文件????????935??2006-12-02?11:22??contourlet_toolbox\contourlet_toolbox\contourlet_toolbox\lprec.m

............此處省略55個文件信息