How to store the co-ordinates of a pixel in an array?

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Rachel 2014-1-21

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回答： AJ von Alt 2014-1-21

Dear All,

I have a certain number of pixels selected based on a condition (if the pixel value is zero), and I want to take the first 10 of these pixels and get their co-ordinates and store it into an array.

Can anyone help? Thanks in advance!

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Answer 1

AJ von Alt 2014-1-21

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Assuming that by the first 10 pixels, you mean the first 10 in column major order, find will do this for you.

% Generate a random logical matrix
binMat      = binornd(1,0.5,[20 20]);
numToFind   = 10; % number of indices to find
% find the subscript indcies for the first numToFind values set to 1 in
% column major order
[r , c] = find( binMat , numToFind );