area__thersh___in__num__img

x=imread('textt.png');
%hold on%x=imread ('rc.jpg');%img=rgb2gray(x);
umb=graythresh(x);
bw=im2bw(x,umb);
[l ne]=bwlabel(bw);
pr=regionprops(l,'Area','BoundingBox');
av=[pr.Area];
id=find((500<=av)&(av<=10000));
h=ismember(l,id);
np=regionprops(h);
whos h
hold on
for n=1:size(np,1)
    rectangle('Position',np(n).BoundingBox,'EdgeColor','g','LineWidth',5)
end
hold on
subplot(2,1,1)
imshow(x); xlabel('originial image ');
hold on
subplot(2,1,2)
imshow(h); xlabel('number detected image ');