%?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
-----------?---------??----------?-----??----
?????目錄???????????0??2018-09-13?21:34??jpegtbx_1.4\
?????文件???????44042??2016-03-24?21:48??jpegtbx_1.4\111.jpg
?????文件???????12787??2003-10-30?18:44??jpegtbx_1.4\README
?????文件?????????614??2003-10-30?18:44??jpegtbx_1.4\bdct.m
?????文件?????????506??2003-10-30?18:44??jpegtbx_1.4\bdctmtx.m
?????文件?????????563??2003-10-30?18:44??jpegtbx_1.4\dequantize.m
?????文件?????????638??2003-10-30?18:44??jpegtbx_1.4\ibdct.m
?????文件????????1552??2003-10-30?18:44??jpegtbx_1.4\im2vec.m
?????文件????????2462??2003-10-30?18:44??jpegtbx_1.4\jpeg_qtable.m
?????文件???????14229??2003-10-30?18:44??jpegtbx_1.4\jpeg_read.c
?????文件???????65536??2003-10-30?18:44??jpegtbx_1.4\jpeg_read.dll
?????文件?????????474??2003-10-30?18:44??jpegtbx_1.4\jpeg_read.m
?????文件???????17765??2005-06-01?12:46??jpegtbx_1.4\jpeg_read.mexa64
?????文件???????57344??2013-02-17?23:53??jpegtbx_1.4\jpeg_read.mexw64
?????文件???????12714??2003-10-30?18:44??jpegtbx_1.4\jpeg_write.c
?????文件???????57344??2003-10-30?18:44??jpegtbx_1.4\jpeg_write.dll
?????文件?????????430??2003-10-30?18:44??jpegtbx_1.4\jpeg_write.m
?????文件???????17263??2005-06-01?12:47??jpegtbx_1.4\jpeg_write.mexa64
?????文件???????55296??2013-02-17?23:53??jpegtbx_1.4\jpeg_write.mexw64
?????文件?????????521??2003-10-30?18:44??jpegtbx_1.4\quantize.m
?????文件????????1569??2003-10-30?18:44??jpegtbx_1.4\vec2im.m
?????文件?????????584??2012-05-26?21:56??jpegtbx_1.4\案例?gulaoshi2.blog.163.com.txt