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

Question

Navdeep Sony 2016-1-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/265916-how-can-we-generate-an-image-with-equal-number-of-intensity-values

评论： Image Analyst 2016-1-31

采纳的回答： Walter Roberson

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

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Image Analyst 2016-1-31

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.

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Answer 1

Walter Roberson 2016-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/265916-how-can-we-generate-an-image-with-equal-number-of-intensity-values#answer_207984

在 MATLAB Online 中打开

   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);