break bitmap into grids

i have the following problem to which i just cant think of an algorithm to apply. can someone kindly help?

i have an application that captures bitmaps using webcams. what i need to do is to break up the bitmap into 7by9 grid boxes, and read the pixel values within each grid box (one box at a time) into an array, done recursively within a for loop for the entire bitmap.

any help is greatly appreciated..!!
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