Segment grid boxes

Question

Siddharth Mallya 2011-3-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/3816-segment-grid-boxes

rgb = imread('peppers.png');
imshow(rgb)
hold on
M = size(rgb,1);
  N = size(rgb,2);
    for k = 1:25:M
        x = [1 N];
        y = [k k];
        plot(x,y,'Color','w','LineStyle','-');
        plot(x,y,'Color','k','LineStyle',':');
    end
    for k = 1:25:N
        x = [k k];
        y = [1 M];
        plot(x,y,'Color','w','LineStyle','-');
        plot(x,y,'Color','k','LineStyle',':');
    end
    hold off

Suppose I want to segment and extract individual areas of the grid .. How do I go about it ? Like, which boundary detection algorithm is used for this purpose ?

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Sean de Wolski 2011-3-25

Post an image! How do you expect us to figure anything out when we can't see what you're doing!

Siddharth Mallya 2011-3-27

http://img703.imageshack.us/i/gridg.png/

This is my image. If I want to segment each block of the grid, should I crop it each time ? or should I use some other approach ?

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Answer 1

Walter Roberson 2011-4-12

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Regular rectangular grids, or potentially irregular spacing?

If it is a regular rectangular grid, crop to contain only full cells, detect the grid line separation, then mat2cell() or blkproc() or blockproc()

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Walter Roberson 2011-4-14

Your variables hint at "first row" to "last column" which doesn't sound right. A renaming might be in order.

Now, provided that lc1 and N have been chosen to be on grid boundaries:

mat2cell(img(fc1:N+21,fr1:lc1+31), 21 * ones(1,1+(N-fc1)/21), 31 * ones(1,1+(lc1-fr1)/31))

Siddharth Mallya 2011-4-15

Thank you so much Walter ! You've been a great help to me .. :)

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Answer 2

Pedro Serra 2011-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/3816-segment-grid-boxes#answer_5627

An answer to this question would be really nice. I'm dealing with the same issue:

I have an image upon which I've drawn a grid. I now would like to understand how can I extract individual areas of the grid?

(My final goal is to color specific areas of that grid)

Thanks in advance!

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Siddharth Mallya 2011-3-25

Well, one way I am thinking now is to crop the image in a for loop .. But i think the computational complexity increasing in this .. So ya, are there any boundary detection algorithm like flood fill with a seed point ?

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