ex_center.m

用matlab计算图片中圆心的坐标

%extract_center
%function output=ex_center(I) %输入待处理图像，得到圆心数组
I=imread('D:\摄象机标定\Cali\left.bmp');
Image=I;
imshow(Image);
%imshow(Image);
%观察图像，考察背景在图像中的位置
[m,n]=size(Image);
a=700;
b=1280;
Model=zeros(a,b);
for i=1:a;
    for j=1:b;
        Model(i,j)=Image(i,j);
    end
end

%再观察目标的灰度范围
T=150;
mask1=Model>150;
imshow(mask1);
L=bwlabel(mask1);%标记对象
stats=regionprops(L,'all');%求对象的属性
re_first=[];
long=length(stats);
for ii=1:long;
    re_first=cat(1,re_first,stats(ii).Centroid);
end
re_last=zeros(long,2);
re_last(:,1)=re_first(:,2);
re_last(:,2)=re_first(:,1);
%for i=1:long;
 %   for j=1:2;
  %      re_last(i,j)=ceil(re_last(i,j));%就近取整
   % end
%end
output=zeros(long,2);
output=re_last;