img = imread('target.jpg');
>> figure
>> imshow(img);
>> threshold = graythresh(img);
>> bw = ~im2bw(img,threshold);
>> bw = bwareaopen(bw, 40);
>> figure
>> imshow(bw)
>> I = padarray(bw,[1 1],1,'pre');
>> bw = imfill(I,'holes');
>> bw = bw(3:end,3:end);
>> figure
>> imshow(bw);
>> [CC,NUM] = bwlabel(bw,4)
>> sizecell = regionprops(CC,'basic');
>> cell= bwareaopen(bw,6000);
>> st = imsubtract(bw,cell);
>> normal = bwareaopen(st,2000);
>> small = imsubtract(logical(st),normal);
>> [normal,num1] = bwlabel(normal);
>> figure
>> imshow(normal);
>> title(['Normal size: ' num2str(num1) '']);
>> [small,num2] = bwlabel(small);
>> figure
>> imshow(small);
>> title(['Small size: ' num2str(num2) '']);
>> [cell,num3] = bwlabel(cell);
>> figure
>> imshow(cell);
>> title(['Two Cell: ' num2str(num3) '']);