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

Question

Julian 2013-5-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76779-recolor-an-image-tile-wise-with-average-colors-of-these-certain-tiles

采纳的回答： Sean de Wolski

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Sean de Wolski 2013-5-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76779-recolor-an-image-tile-wise-with-average-colors-of-these-certain-tiles#answer_86426

在 MATLAB Online 中打开

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)))

3 个评论
显示 1更早的评论隐藏 1更早的评论

Sean de Wolski 2013-5-23

编辑：Sean de Wolski 2013-5-24

在 MATLAB Online 中打开

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 2013-5-24

Great! It's always amazing, how fast someone is able to help around here :)

Thank you again!

请先登录，再进行评论。

Answer 2

Matt J 2013-5-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76779-recolor-an-image-tile-wise-with-average-colors-of-these-certain-tiles#answer_86425

编辑：Matt J 2013-5-23

在 MATLAB Online 中打开

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.