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Perform histogram equalization and plot the original and equalized histogram.
written 7.8 years ago by gravatar for teamques10 teamques10 ★ 64k modified 2.2 years ago by gravatar for pedsangini276 pedsangini276 • 4.7k

enter image description here

Mumbai University > Electronics > Sem 7 > Digital image processing

Marks: 10 M

Year: Dec 2014
digital image processing
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written 7.8 years ago by gravatar for teamques10 teamques10 ★ 64k

We draw the original histogram of the image.

enter image description here

Here L=8, we now perform histogram equalization.

Grey level nk PDF,Pr(k) = n,Σ n CDF,Sk =Σ pr(k) Sk x (L-1),i.e. sk x 7 Round off
0 200 0.125 0.125 0.875 1
1 300 0.185 0.31 2.17 2
2 500 0.3125 0.622 4.35 4
3 350 0.2185 0.841 5.88 6
4 250 0.156 1 7 7
5 0 0 1 7 7
6 0 0 0
7 0 0 0
Σn=1600

Consider the 1st, 2nd and last column

enter image description here

Hence the equalized frequency table is

1 2 3 4 5 6 7
200 300 0 500 0 350 250

enter image description here
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