average RGB values from list of pixels.

how do you average the RGB values from a list of pixels through the use of a function where the input is a 3d array and the outputs give the average values of the red, green and blue pixels?

[David Hill]

Do you have a colormap for the 1d array?

[Devdolly Saini]

sorry the input is a 1xnx3 3d array not a 1d array

[Rik]

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Answer 1

[Adam Danz]

If x is your 1xnx3 array, meanRGB will be a 1x3 vector of the average rgb values.

 meanRGB = mean(squeeze(x),1); 

Here's the function form, using median

  MedianPixel = @(pixels)median(squeeze(pixels),1);

Test it

  pixels(:,:,1) = [54 50 45]; 
  pixels(:,:,2) = [48,52,43];
  pixels(:,:,3) = [50,41,47];
  MedianPixel(pixels)
  
  % Result
  % ans =
  %   50    48    47

Here is another version that splits the outputs if needed (it's unnecessary but it's what's described in the document).

  function [R,G,B] = MedianPixels(pixels)
      R = median(pixels(:,:,1)); 
      G = median(pixels(:,:,2)); 
      B = median(pixels(:,:,3)); 
  end