Is your video grayscale or RGB? If it is RGB then your 16x16x30 would need a "x3" somewhere in there to account for the color.
If it is grayscale and all of the images are the same size, then save the 30 images into an array, such as
for FrameNumber = 1 : 30
Images(:,:,FrameNumber) = getsnapshot(videoobject);
end
Then afterwards,
SplitImages = mat2cell(Images, 16 * ones(1, size(Images,1) / 16), 16 * ones(1, size(Images,2) / 16), size(Images,3));
If you want the frames to overlap temporally, you will need to indicate how much overlap you want.
