How can we generate an image with equal number of intensity values?

For example we have an image that has 5 pixels with intensity 100, 5 with intensity 50, 5 with intensity 200 and so on.

[Image Analyst]

Do all gray levels have an equal number of occurrence, or do you want to specify exactly what gray levels occur and for how many pixels each gray level occurs? If all have equal, then you want histogram equalization, but not like most people do it. You'd have to use special code.

Answer 1

[Walter Roberson]

   needHeight = 96;   needWidth = 78;   %adjust as required

   default_pix_intens = 0;   %default intensity if the template does not describe enough pixels
   template = [5, 100;       %count, intensity
              5, 50;
              5, 200];

   num_pix_needed = needHeight * needWidth;

   pixdata = [];
   for K = 1 : size(template,1)
      pixdata = [pixdata, repmat(template(K,2), 1, template(K,1))];
   end

   num_pix_templated = length(pixdata);

   if num_pix_templated > num_pix_needed
     error( fprintf('only %d total pixels needed but template describes %d pixels', num_pix_needed, num_pix_templated) );
   elseif num_pix_templated < num_pix_needed
     pixdata(num_pix_templated+1 : num_pix_needed) = default_pix_intens;
   end

   scrambled_pixdata = pixdata(randperm(numel(pixdata)));  %assuming you want a random order

   pix_matrix = reshape(scrambled_pixdata, needHeight, needWidth);