bwlabel does not count objects in the image

I wrote a code to count lymphocites but numObjects always says zero

IL = imread('Lymphocytes.jpg');
imshow(IL, [])
imhist(IL)

Thresh = multithresh(IL,2);

seg_I2 = imquantize(IL,Thresh);

imshow(seg_I2, [])

for i=1:size(seg_I2,1)
    for j=1:size(seg_I2,2)
        if seg_I2(i,j)==1
            seg_I2(i,j)=3;
        end
    end
end

imshow(seg_I2,[])

J = imcomplement(seg_I2);
imshow(J,[])

binaryImage = J > 128;

[labeled,numObjects]=bwlabel(binaryImage,8);

[Image Analyst]

You're not showing us seg_I2 or J or binaryImage. Not only that, but you forgot to attach 'Lymphocytes.jpg' so we can't do anything but assume it's doing what you told it to do. Chances are binaryImage is all false. Check

maxValue = max(binaryImage)