%?BDCT?Blocked?discrete?cosine?transform
%
%????B?=?BDCT（A）?computes?DCT2?transform?of?A?in?8x8?blocks.??B?is
%????the?same?size?as?A?and?contains?the?cosine?transform?coefficients?for
%????each?block.??This?transform?can?be?inverted?using?IBDCT.
%
%????B?=?BDCT（AN）?computes?DCT2?transform?of?A?in?blocks?of?size?NxN.

%?Phil?Sallee?9/03

function?b?=?bdct（an）

if?（nargin???n?=?8;
end

%?generate?the?matrix?for?the?full?2D?DCT?transform?（both?directions）
dctm?=?bdctmtx（n）;

%?reshape?image?into?blocks?multiply?and?reshape?back
[vrc]?=?im2vec（an）;
b?=?vec2im（dctm*v0nrc）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????33862??2010-05-26?18:57??Lena.JPG
?????文件??????263222??2006-12-15?10:57??Lena.bmp
?????文件???????12787??2003-10-30?18:44??README
?????文件?????????614??2003-10-30?18:44??bdct.m
?????文件?????????506??2003-10-30?18:44??bdctmtx.m
?????文件?????????563??2003-10-30?18:44??dequantize.m
?????文件??????????27??2015-03-23?16:08??example.m
?????文件?????????638??2003-10-30?18:44??ibdct.m
?????文件????????1552??2003-10-30?18:44??im2vec.m
?????目錄???????????0??2016-01-05?14:05??jpeg-9a\
?????文件????????5067??2012-05-09?22:13??jpeg-9a\Makefile.am
?????文件???????37799??2014-01-03?19:20??jpeg-9a\Makefile.in
?????文件???????19491??2014-01-19?17:06??jpeg-9a\README
?????目錄???????????0??2016-01-05?14:05??jpeg-9a\Release\
?????文件???????97630??2015-05-12?13:58??jpeg-9a\Release\CL.read.1.tlog
?????文件???????20096??2015-05-12?13:58??jpeg-9a\Release\CL.write.1.tlog
?????文件???????11204??2015-05-12?13:58??jpeg-9a\Release\Lib-link.read.1.tlog
?????文件????????5592??2015-05-12?13:58??jpeg-9a\Release\Lib-link.write.1.tlog
?????文件???????30544??2015-05-12?13:58??jpeg-9a\Release\cl.command.1.tlog
?????文件????????8602??2015-05-12?13:58??jpeg-9a\Release\jaricom.obj
?????文件???????16883??2015-05-12?13:58??jpeg-9a\Release\jcapimin.obj
?????文件???????12895??2015-05-12?13:58??jpeg-9a\Release\jcapistd.obj
?????文件???????35185??2015-05-12?13:58??jpeg-9a\Release\jcarith.obj
?????文件???????21149??2015-05-12?13:58??jpeg-9a\Release\jccoefct.obj
?????文件???????25771??2015-05-12?13:58??jpeg-9a\Release\jccolor.obj
?????文件???????22038??2015-05-12?13:58??jpeg-9a\Release\jcdctmgr.obj
?????文件???????48696??2015-05-12?13:58??jpeg-9a\Release\jchuff.obj
?????文件???????11064??2015-05-12?13:58??jpeg-9a\Release\jcinit.obj
?????文件???????12251??2015-05-12?13:58??jpeg-9a\Release\jcmainct.obj
?????文件???????28224??2015-05-12?13:58??jpeg-9a\Release\jcmarker.obj
?????文件???????40073??2015-05-12?13:58??jpeg-9a\Release\jcmaster.obj
............此處省略240個文件信息