histogram equalization transformation function

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Suppose that a given 3-bit image(L=8) of size 64*64 pixels (M*N=4096) has the intensity distribution shown as below. How to obtain histogram equalization transformation function and then compute the equalized histogram of the image?

Rk nk

0 800

1 520

2 970

3 660

4 330

5 450

6 260

7 106

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Saiteja B 2019-11-22

Did u get the code for histeq without matlab tool or code for your mentioned problem,if yes please post here? Thank u.!!

CANDY 2022-10-4

hi dear were you able to get the answer to this work ?

if yes , can you show me the codes ?

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Answer 1

Image Analyst 2018-12-9

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Call histeq() followed by imhist().

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pandu hanifa 2018-12-9

编辑：pandu hanifa 2018-12-9

if equation i know how to finish it,, i want to know the code( without in-built function matlab), and if its c++ i aldy try and can,, but in matlab the code i write keep eror idk why

rk nk c sk = c/MN (L-1)sk rounded value

0 800 800 0.195 1.365 1

1 520 1320 0.322 2.254 2

2 970 2290 0.559 3.913 4

3 660 2950 0.720 5.04 5

4 330 3280 0.801 5.601 6

5 450 3730 0.911 6.377 6

6 260 3990 0.974 6.818 7

7 106 4096 1.000 7.0 7

Image Analyst 2018-12-9

Why without built-in functions???

Why would you want to compute the histogram, then the cdf, then invert it, and use intlut() when you can just do it in one line of code?

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histogram equalization transformation function

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