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Perform histogram equalization and plot the original and equalized histogram.

written 9.6 years ago by teamques10 ★ 70k

modified 4.0 years ago by krithikkm200 • 10

Mumbai University > Electronics > Sem 7 > Digital image processing

Marks: 10 M

Year: May 2015

digital image processing

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written 9.6 years ago by teamques10 ★ 70k

We draw the original histogram of the image.

Here L=8, we now perform histogram equalization.

Gray 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	550	0.34	0.34	2.38	2
1	300	0.18	0.52	3.64	4
2	0	0	0.52	3.64	4
3	0	0	0.52	3.64	4
4	0	0	0.52	3.64	4
5	200	0.125	0.645	4.48	4
6	325	0.20	0.845	5.91	6
7	225	0.14	1	7	7
Σn=1600

Consider the 1st , 2nd and last column

Hence the equalized frequency table is

Gray level	0	1	2	3	4	5	6	7
nk	0	0	550	0	500	0	325	225

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