急求大神帮我解释一下这段代码，谢谢了。

Question

BW=im2bw(I,0.5);
[n1 n2]=size(BW);
r=floor(n1/10);
c=floor(n2/10);
x1=1;x2=r;
s=r*c;

for i=1:10
y1=1;y2=c;
for j=1:10
if (y2<=c | y2>=9*c) | (x1==1 | x2==r*10)
loc=find(BW(x1:x2, y1:y2)==0);
[o p]=size(loc);
pr=o*100/s;
if pr<=100
BW(x1:x2, y1:y2)=0;
r1=x1;r2=x2;s1=y1;s2=y2;
pr1=0;
end
%imshow(BW);
end
y1=y1+c;
y2=y2+c;
end

x1=x1+r;
x2=x2+r;
end

Answer 1

数学算法，你可以看下教材