Let's say the pixels are considered to be at the center of the number. So with this image
[0, 1, 1, 0]
There is a pixel at 2, and one at 3. So the centroid would be at 2.5. If the image is
[0, 1, 1, 1, 1, 0
0, 1, 1, 1, 1, 0]
The xCentroid is at 3.5 and the y centroid is at 1.5. As you can imagine, as you get lots more pixels, the centroid could be at some other fractional location. Does that explain it?
