Dividing the image into blocks

Question

kash 2012-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/54914-dividing-the-image-into-blocks

编辑： Image Analyst 2018-11-30

I have a image that I want to divide into blocks until each pixel in block have same value. For example in the link below I have an image

http://www.sendspace.com/file/vp3njo

The image consists of waters ,leaves and green parts. I want to keep dividing into blocks until it contains the same value.

Please help.

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kash 2012-11-27

编辑：Image Analyst 2018-9-12

在 MATLAB Online 中打开

Assuming the value below taken from image

im =   64    65    66    69    69
       64    66    68    70    72
       64    64    66    67    73
       64    62    64    62    67
       63    60    62    63    66
       64    62    60    63    67
       67    63    61    61    65
       67    68    67    63    63

In this pixel value 64 has 4 values, so it must be in a block, 63 must be block, 64 must be block, last two 67s must be a block and so on. In 4th and 5th columns 2 values of 69s must be grouped, and so on i.e same pixel value must be in a block

Image Analyst 2012-11-27

I didn't see a picture immediately either. When I clicked on the download link, my company threw up a page that says they've forbidden us to go to that web site. Please pick a site where we can see the image immediately, like tinypic.com or dozens of others.

What do you mean "grouped" or "in a block"? I think of a block as rectangular - what if your contiguous set of gray levels is not rectangular? Can you have blob-shaped "blocks"? If so are you talking about connected components labeling like done with bwlabel and bwconncomp?

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Answer 1

Image Analyst 2012-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/54914-dividing-the-image-into-blocks#answer_66650

在 MATLAB Online 中打开

kash, I know you've been doing image processing for over a year now and I know you know about bwlabel() and bwconncomp(), so tell me why doing something like

labeled67blobs = bwlabel(grayImage == 67); % Similar for any other number.

is not doing what you want?

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kash 2012-11-27

The image is http://imgur.com/upT3y

i saw tour demo at

http://www.mathworks.in/matlabcentral/answers/46705-how-images-are-divided-into-sub-images

like that i want to divide as in peppers image,

want to divide into sub image such that wach subimage has same pixel value

kash 2012-11-27

labeled67blobs = bwlabel(grayImage == 67)

does not give answer

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Answer 2

Salma Hassan 2018-9-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54914-dividing-the-image-into-blocks#answer_336387

编辑：Walter Roberson 2018-9-11

在 MATLAB Online 中打开

i=imread('image_1_0.png');
i=imresize(i,[256 256]);
   a=64; b=64; %window size
x=size(i,1)/a; y=size(i,2)/b; 
m=a*ones(1,x); n=b*ones(1,y);
C =mat2cell(i,m,n);
C = C(:);
%# display tiles i subplots
      for j=1:a*b
          block_image  = mean2(C{j});
          if block_image > 10 
            imshow( C{j} )
          end
      end

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suha athab 2018-11-30

编辑：Image Analyst 2018-11-30

Your code is very useful for me, but I wonder, if I can display only the block with maximum mean value, what will I do? Please answer me.

Image Analyst 2018-11-30

It is not necessary that you do ONLY that. You can do whatever you want. You can keep track of the means for all block and display only the single block that has the highest mean if you want. See my attached blockproc demos.

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