function U1=choice(u0,Daxiao)
L = bwlabel(u0,8);
%%提取物体属性
STATS = regionprops(L,'Area');

%%提取面积数组
area=[STATS.Area];
% [m_area,n_area]=size(area);
% num_big=0;
% for i=1:n_area
%     if area(1,i)>100
%         num_big=num_big+1;
%     end
% end

%选取面积大的目标
area_num=area(area>Daxiao);
%计算大目标数量
Length_area_num=numel(area_num) ; 
%设定数组，用来存储对于目标的标号
array=zeros(1,Length_area_num);

%将对于目标的编号存储在数字array中
% for k=1:Length_area_num
% %      array(1,k)=find(area==area_num(1,k));       
%        
% end
num_big=1;
[m_area,n_area]=size(area);
for i=1:n_area
    if area(1,i)>100
        array(1,num_big)=i;
        num_big=num_big+1;
    end
end


L_new=L;
[m_L_new,n_L_new]=size(L_new);
for i=1:m_L_new
    for j=1:n_L_new
        for k1=1:Length_area_num
            if (L_new(i,j)==array(1,k1))
                L_new(i,j)=0;
            end
        end
    end
end
U1=L_new;