distance between center of bounding box in text image

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i tried to segment line to individual words, according to distance between letters, so i create image 2 (bounding box), then i calculate centroied for each box, but i have used following code

     s = regionprops(imgn,'centroid');

     stats = regionprops(lab,'Centroid','MajorAxisLength','MinorAxisLength')

   cent = cat(1, stats.Centroid);
centers = stats.Centroid;
size_cent= size(cent);
figure(5),imshow(f1);
hold on
plot(cent(:,1), cent(:,2), 'b*')
hold off
x=cent(:,1);
y=cent(:,2);

then calculate the distance between x, y coordinates, but the values of distances is not varying to separate words, i don't know how to take the decision? Any one have an idea?