function?[y]=invZigzag（x）
%?inverse?transform?from?the?zigzag?format?to?the?matrix?form

row=round（sqrt（length（x）））;

if?row*row~=length（x）
???disp（‘invZigzag（）?fails!!?Must?be?a?square?matrix!!‘）;
???return;
end;

y=zeros（rowrow）;
count=1;
for?s=1:row
???if?mod（s2）==0
??????for?m=s:-1:1
?????????y（ms+1-m）=x（count）;?
?????????count=count+1;
??????end;
???else?
??????for?m=1:s
?????????y（ms+1-m）=x（count）;?
?????????count=count+1;
??????end;
???end;
end;

if?mod（row2）==0
???flip=1;
else
???flip=0;
end;

for?s=row+1:2*row-1
???if?mod（flip2）==0
??????for?m=row:-1:s+1-row
?????????y（ms+1-m）=x（count）;?
?????????count=count+1;
??????end;
???else?
??????for?m=row:-1:s+1-row
?????????y（s+1-mm）=x（count）;
?????????count=count+1;
??????end;
???end;
???flip=flip+1;
end;

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

?????文件????????776??2009-03-21?13:47??image?compression?final\invZigzag.m

?????文件??????66614??2009-03-20?19:53??image?compression?final\Lena.bmp

?????文件??????66614??2009-03-21?14:02??image?compression?final\Lena2.bmp

?????文件???????2588??2009-03-21?13:53??image?compression?final\main.asv

?????文件???????2674??2009-03-21?14:02??image?compression?final\main.m

?????文件????????970??2009-03-20?19:53??image?compression?final\main2.asv

?????文件???????1330??2009-03-21?14:00??image?compression?final\main2.m

?????文件????????465??2009-03-20?19:53??image?compression?final\my_dct2.asv

?????文件????????624??2009-03-20?19:53??image?compression?final\my_dct2.m

?????文件????????740??2009-03-20?19:53??image?compression?final\my_idct2.m

?????文件????????523??2009-03-21?11:26??image?compression?final\PSNR.m

?????文件????????727??2009-03-21?13:47??image?compression?final\toZigzag.m

?????目錄??????????0??2009-03-21?13:51??image?compression?final

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

???????????????144645????????????????????13