Recolor an image tile-wise with average colors of these certain tiles

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Julian
Julian 2013-5-23
Hello everyone,
I have the following image (original image is .tif format)
Now, I would like to recolor it, that I don't have single color pixels anymore. I imagine something like the following:
assess a 10 x 10 pixel wide tile (or any other size), add only the non-zero color values and devide it by the number of non-zero values in this 10 x 10 tile to get the average pixel color. Than, recolor this 10 x 10 tile with the average pixel color. And than repeat this, with all possible not overlapping tiles of the image.
I hope, someone is 1. abler to understand waht I tried to say and 2. also able to help me.
Thank you!
Julian

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Sean de Wolski
Sean de Wolski 2013-5-23
Use blockproc to handle the block processing
doc blockproc
Then write a function which does the average ignoring zeros. So something like:
blockproc(magic(100),[10 10], @(bs)(sum(bs.data(logical(bs.data)))./nnz(bs.data))*ones(size(bs.data)))
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Sean de Wolski
Sean de Wolski 2013-5-23
编辑：Sean de Wolski 2013-5-24
You could use it in a for-loop over each colorplane
szI = size(I);
I2 = zeros(szI,'like',I);
for ii = 1:szI(3)
I2(:,:,ii) = what_I_Have(I(:,:,ii));
end
Julian
Julian 2013-5-24
Great! It's always amazing, how fast someone is able to help around here :)
Thank you again!

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Matt J
Matt J 2013-5-23
编辑：Matt J 2013-5-23
Splitting the image into tiles is easy using FEX: mat2tiles.
>> Image=rand(40,40); mat2tiles(Image,[10,10])
ans =
[10x10 double] [10x10 double] [10x10 double] [10x10 double]
[10x10 double] [10x10 double] [10x10 double] [10x10 double]
[10x10 double] [10x10 double] [10x10 double] [10x10 double]
[10x10 double] [10x10 double] [10x10 double] [10x10 double]
You can then do all the operations you're talking about on each cell using a simple for-loop.

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