Dividing pixel array from cam?

beginners
#1

How do I divide the pixel array from the camera into 16 equal sections so that when hands are detected in different areas they trigger different sounds/effects?

I have a pretty good idea of how to pseudo this, but bit stuck on implementing it. Can anyone help?

Are there any example codes similar to this?

#2

you can get the centroid from each blob that opencv detects with that, the centroid is an ofPoint with x and y coordinates so just check if that coordinates are in one of the divisions.