clc;clear?all;close?all;
I=imread（‘C:\MATLAB7\work\HW_1_1.jpg‘）;
imshow（I[]）;title（‘Original?Image‘）;
I=double（I）;
[height?width?n]=size（I）;
hheight=height/5;hwidth=width/5;
dI1=zeros（hheighthwidthn）;
for?k=1:hheight
????for?kk=1:hwidth
????????for?kkk=1:n
????????????dI1（kkkkkk）=I（5*k-45*kk-4kkk）/255;?
????????end
????end
end
figure;imshow（dI1[]）;title（‘jiangcaiyang‘）;
imwrite（dI1‘jiangcaiyang.jpg‘‘jpg‘）;

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

?????文件??????21263??2009-10-25?12:04??降采樣\jiangcaiyang.jpg

?????文件????????440??2009-10-25?23:28??降采樣\jiangcaiyang.m

?????文件?????????52??2010-01-10?22:23??降采樣\readme.txt

?????目錄??????????0??2010-01-10?22:36??降采樣

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

????????????????21755????????????????????4