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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.

written 8.5 years ago by teamques10 ★ 68k

•   modified 4.6 years ago

image processing

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written 8.5 years ago by teamques10 ★ 68k

We draw the original histogram of the image.

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

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

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