Using blockproc to simply copy an array

Hi can I use blockproc to copy 3 arrays

and them merge them

redChannel = I(:, :, 1);
greenChannel = I(:, :, 2);
blueChannel = I(:, :, 3);
 
%% output functions
funr = redChannel + greenChannel + blueChannel;
fung = S(:,:,2);
funb = S(:,:,3);
blockSize = [64 64];
@(block_struct) (block_struct.data) * ones(size(block_struct.data));
 
%% blocks
blockyImageR = blockproc(I, blockSize, funr)
blockyImageR = blockproc(redChannel, blockSize, fung)

The above trials are not working.

output should be blocks of 64x64x3

Answer 1

[Matt J]

Using sepblockfun from the file exchange,

https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-operations

blockSize = [64 64];
R=sepblockfun(I,[blockSize,3],'sum');
R=repelem(R,blockSize);

I(:,:,1)=R;

[Saud Alfalasi]

Hi Matt, thank you I will give this a try.

I would also like to try and pinpoint the minddle value of my block (coordinates 2,2) and do a quoteince differnce betwen it and the surrounding values. - is this possible?

Ideally what I want to do is not only change values in blocks but also manage the sequence of movement from block to block - example follwing some kind of sequence which results in going from block1 > block 7 > block 27

Will the sepblockfun allow this?

I'm trying to manipulate each element in each block with a set of conditons - ('if's, 'else's, 'for's - is this doable?