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The grey distribution of an image is shown in the table below. Perform histogram equalization and plot the original and equalized histogram.
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We draw the original histogram of the image.

enter image description here

Here L=8, we now perform histogram equalization.

Grey level $n_k$ PDF,Pr(k) = n,Σn CDF,Sk =Σpr(k) Sk x(L-1),i.e. sk x 7 Round off
0 0 0 0 0 0
1 50 0.05 0.05 0.35 0
2 100 0.1 0.15 1.05 1
3 200 0.2 0.35 2.45 2
4 400 0.4 0.75 5.25 5
5 200 0.2 0.95 6.65 7
6 50 0.05 1 7 7
7 0 0 1 7 7
Σn=1000

Consider the 1st , 2nd and last column

enter image description here

Hence the equalized frequency table is

Grey level 0 1 2 3 4 5 6 7
$nk$ 50 100 200 0 0 400 0 250

enter image description here

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