I need to add alpha plane mapping in an image and display individual alpha plane and also all added alpha plane result image. How to do it.?

I have an image of 250x300 size. I need to add alpha plane mapping with 200 alpha planes in it and display individual alpha planes and also all added alpha plane result image. Please help how to do it.?

Answer 1

[Image Analyst]

I'm not clear what you want. Why don't you just create an image by adding all the "alpha planes" together? How is what you asked for any different than that? You can even have one such summed image be a transparency over another gray scale image.

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image

Answer 2

[Walter Roberson]

 Example:

   img = imread('YourImage.png');
   imgg = rgb2gray(img);

   counts = accumarray(imgg(:)+1, 1, [256 1]);  %histogram
   counts_nz = counts(2:end);      %skip level 0

   meaningful_levels = find(counts_nz >= 20);     %find levels with at least 20 pixels
   num_ml = length(meaningful_levels);
   masks = cell(num_ml, 1);

   for K = 1 : num_ml
     this_level = meaningful_levels(K);
     masks{K} = double(imgg == this_level);
     fig = figure();
     image(img, 'AlphaData', masks{K});
     title(sprintf('Pixel value %d', this_level));
   end

   overall_mask = sum(cat(3, masks{:}),3);
   image(img, 'AlphaData', overall_mask);
   title('All levels together');