怎么将二值图象做水平和垂直方向上的投影啊~~~~

[liuwenwenthb]

%图象bw_img1的长和高%
%设bw_img1=(n,m)其中n是bw_img1的高也就是行，m是bw_img1的宽也就是列%
width=length(bw_img1(1,);
height=length(bw_img1(:,1));
aa=zeros(width,1);
for q=1:height
aa(q)=sum(bw_img1(q,);%aa代表的是y轴投影%
end
bb=zeros(1,height);
for w=1:width
bb(w)=sum(bw_img1(:,w));%bb代表的是x轴投影%
end