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How to count number of red, blue and green pixels in image.

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k khaja
k khaja el 8 de Oct. de 2022
Comentada: Walter Roberson el 8 de Oct. de 2022
Hi,
I woud like to know, how can I count number of red, blue and green pixels in image.
Thanks in advance
  3 comentarios
John D'Errico
John D'Errico el 8 de Oct. de 2022
Editada: John D'Errico el 8 de Oct. de 2022
Pixels are almost never fully red, green, or blue. And what you might call red, green, or blue might not be what I would call those colors. So a slightly orangish red, is it still a red pixel? How far does it need to deviate into orange, before it stops being red? Maybe you use the supreme court definition of such a thing: that is, you know what red is when you see it.
You probably need to think about these questions before proceeding.
Walter Roberson
Walter Roberson el 8 de Oct. de 2022
If RGB components are integers 0 to 255, then is [1 0 0] red? That is, the smallest change towards red away from black: does that count as red, or does it count as black? It has red component but not green or blue... under some definitions that would have to count as red.
rng(12345);
Z = zeros(48, 64, 3, 'uint8');
r = randi(size(Z,1),1,1);
c = randi(size(Z,2),1,1);
Z(r, c, 1) = 1;
image(Z)
title('which is the Red pixel?')
fprintf('Red pixel is at x = %d y = %d\n', c, r);
Red pixel is at x = 21 y = 45
Personally I cannot detect the red pixel until you get up to around 40 instead of 1

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