How to implement gray level probability density function?

2014 2 18
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the gray-level probability density function given as P(g) = h(g)/M, where h(g) is the number of pixels with gray level g and M is the total number of pixels in the image.
I want to implement this on a gray scale image, my question is what is h(g) in my case and what are gray level g... i know M is (row*colum) please answer

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Image Analyst
Image Analyst 2014-2-18

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% Get histogram:
[pixelCounts, grayLevels] = imhist(grayImage);
% Computer probability density function:
pdf = pixelCounts / numel(grayImage);

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