How can I divide an image into 64 blocks through the centre of gravity of the image?

The center of gravity is already known using region props but how do I program it to divide the image into 4 blocks through the center of gravity and then further subdivide each block until 64 blocks is gotten.

[Walter Roberson]

Duplicates http://www.mathworks.co.uk/matlabcentral/answers/67843-how-can-i-divide-an-image-into-64-blocks-through-the-centre-of-gravity-of-the-image