How do I create a function that divides an image into 4 blocks through the centre of gravity of the image and then call that function into a program that divides into 16 blocks?

For each image block gotten I need to calculate the block size and orientation.

[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