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How to read the pixel value

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Mech Stud
Mech Stud 2018-3-21
编辑： Mech Stud 2018-3-22
I used the following code to get the x and y coordinates of this image
I =double(imread('F:\01.jpg'));
[ROWS,COLUMNS] = ndgrid(1:size(I,1),1:size(I,2));
ROWS = ROWS(:);
COLUMNS = COLUMNS(:);
A = [ROWS COLUMNS]
I want to get the another column in A stating the pixel value of each pixel point. The purpose is to get the x and y coordinates of the black pixels only in the shortest possible path order

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thitch
thitch 2018-3-21
You could use the following:
ind = 1:size(A,1);
A(:,3) = arrayfun(@(x) I(A(x,1),A(x,2)), ind)';

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