function?[msgresult]=jpgandlsb（testfilegoalfile）

[ste_coverlen_totalmsg]?=?lsbhide（testfile‘temp.tif‘）;
image?=?imread（‘temp.tif‘）;
quality?=?5:5:100;
ber?=?zeros（[1?max（size（quality））]）;
count?=?0;
different?=?0;
for?mygod?=?1:20
????count?=?count?+?1;
????imwrite（image‘temp.jpg‘‘jpg‘‘quality‘count*5）;
????result?=?lsbget（‘temp.jpg‘len_totalgoalfile）;
????for?i?=?1:len_total
????????if?result（i1）~=msg（i1）
????????????different?=?different?+?1;
????????end
????end
????ber（1count）?=?different/len_total;
????different?=?0;
end
plot（qualityber）;
xlabel（‘載體圖像jpeg壓縮率‘）;
ylabel（‘隱藏信息誤碼率‘）;
title（‘載體圖像JPEG壓縮率與隱藏信息誤碼率的關系‘）;
axis（[0?100?0?1]）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2010-01-14?13:43??lsb\
?????文件?????????468??2009-12-12?00:26??lsb\alphabet.txt
?????文件?????????468??2009-12-13?18:21??lsb\alphabet2.txt
?????文件?????????718??2009-12-12?02:07??lsb\jpgandlsb.m
?????文件???????12342??2009-12-07?18:43??lsb\lenna_color_256_jpg.jpg
?????文件???????91424??2009-12-11?22:38??lsb\lenna_color_512_jpg.jpg
?????文件???????10433??2009-12-07?18:43??lsb\lenna_gray_256_jpg.jpg
?????文件???????66614??2009-12-13?18:17??lsb\lenna_gray_256_jpg_stego.bmp
?????文件???????69358??2009-12-11?22:40??lsb\lenna_gray_512_jpg.jpg
?????文件?????????567??2009-12-12?00:59??lsb\lsbget.m
?????文件?????????738??2009-12-12?02:13??lsb\lsbhide.m
?????文件???????26112??2010-01-14?13:43??lsb\Thumbs.db
?????文件?????1027815??2009-12-31?15:46??lsb\實驗報告（1）.doc