function?y?=?conv2c（xh）
%?Circular?2D?convolution
x=wraparound（xh）;
y=conv2（xh‘valid‘）;


function?y?=?wraparound（x?m）
%?Extend?x?so?as?to?wrap?around?on?both?axes?sufficient?to?allow?a
%?“valid“?convolution?with?m?to?return?the?cyclical?convolution.
%?We?assume?mask?origin?near?centre?of?mask?for?compatibility?with
%?“same“?option.
[mx?nx]?=?size（x）;
[mm?nm]?=?size（m）;
if?mm?>?mx?|?nm?>?nx
????error（‘Mask?does?not?fit?inside?array‘）
end

mo?=?floor（（1+mm）/2）;?no?=?floor（（1+nm）/2）;??%?reflected?mask?origin
ml?=?mo-1;????????????nl?=?no-1;?????????????%?mask?left/above?origin
mr?=?mm-mo;???????????nr?=?nm-no;????????????%?mask?right/below?origin
me?=?mx-ml+1;?????????ne?=?nx-nl+1;??????????%?reflected?margin?in?input
mt?=?mx+ml;???????????nt?=?nx+nl;????????????%?top?of?image?in?output
my?=?mx+mm-1;?????????ny?=?nx+nm-1;??????????%?output?size

y?=?zeros（my?ny）;
y（mo:mt?no:nt）?=?x;??????%?central?region
if?ml?>?0
????y（1:ml?no:nt）?=?x（me:mx?:）;???????????????????%?top?side
????if?nl?>?0
????????y（1:ml?1:nl）?=?x（me:mx?ne:nx）;????????????%?top?left?corner
????end
????if?nr?>?0
????????y（1:ml?nt+1:ny）?=?x（me:mx?1:nr）;??????????%?top?right?corner
????end
end
if?mr?>?0
????y（mt+1:my?no:nt）?=?x（1:mr?:）;?????????????????%?bottom?side
????if?nl?>?0
????????y（mt+1:my?1:nl）?=?x（1:mr?ne:nx）;??????????%?bottom?left?corner
????end
????if?nr?>?0
????????y（mt+1:my?nt+1:ny）?=?x（1:mr?1:nr）;????????%?bottom?right?corner
????end
end
if?nl?>?0
????y（mo:mt?1:nl）?=?x（:?ne:nx）;???????????????????%?left?side
end
if?nr?>?0
????y（mo:mt?nt+1:ny）?=?x（:?1:nr）;?????????????????%?right?side
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1666??2007-07-31?14:37??TwIST_v1\conv2c.m

?????文件???????2593??2007-11-23?18:40??TwIST_v1\demo_l2_l0.m

?????文件???????4509??2007-11-23?18:40??TwIST_v1\demo_l2_l1.m

?????文件???????3434??2007-11-23?18:41??TwIST_v1\demo_l2_l1_debias.m

?????文件???????3560??2007-11-23?18:41??TwIST_v1\demo_l2_TV.m

?????文件???????3644??2007-11-23?18:42??TwIST_v1\demo_MRI.m

?????文件???????3644??2007-11-21?00:19??TwIST_v1\demo_Piecewise_cubic_polynomial.m

?????文件???????4700??2007-11-21?18:59??TwIST_v1\demo_sinusoids_l2_l1.m

?????文件???????3408??2007-11-23?18:40??TwIST_v1\demo_wave_DWT_deconv.m

?????文件?????????52??2007-11-09?00:31??TwIST_v1\diffh.m

?????文件?????????53??2007-11-09?00:31??TwIST_v1\diffv.m

?????文件????????226??2007-10-17?14:26??TwIST_v1\hard.m

?????文件?????????96??2007-10-19?17:35??TwIST_v1\l0norm.m

?????文件????????693??2007-11-09?00:51??TwIST_v1\masked_FFT.m

?????文件????????435??2007-11-09?00:51??TwIST_v1\masked_FFT_t.m

?????文件??????98304??2007-11-09?00:31??TwIST_v1\mex_vartotale.dll

?????文件???????1106??2007-07-31?14:28??TwIST_v1\mex_vartotale.m

?????文件????????477??2007-11-09?00:52??TwIST_v1\MRImask.m

?????文件???????2355??2007-11-23?18:47??TwIST_v1\README.txt

?????文件?????????73??2007-10-18?17:08??TwIST_v1\soft.m

?????文件?????????70??2007-11-09?00:31??TwIST_v1\TVnorm.m

?????文件??????22642??2007-11-20?23:49??TwIST_v1\TwIST.m

?????目錄??????????0??2007-12-23?23:56??TwIST_v1

-----------?---------??----------?-----??----

???????????????157958????????????????????24