divide an image region into 4x4 blocks

How do I divide an image region into 4x4 blocks and then For each block, calculate the mean value of the block?

Answer 1

[Joseph Cheng]

You can try to use blockproc(A,[4 4],fun) where fun is a function which does mean(mean(block_struct.data))

[fereshte]

thank you Joseph

Answer 2

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F as well as my two attached blockproc demos.

[fereshte]

thank you.

1.can you divide image to 3*3 blocks with blockproc_demo2.m?

2.how i can calculate mean just for fifth window in 3*3 blocks?