Re: Image histogram Equalization

On Sat, 09 Feb 2008 19:45:07 GMT, Martin Leese
<please@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

bo wrote:
I'm taking an image proc. class and am having trouble understand how
to do histogram equalization in MATLAB--without using its built in
functions. i.e. understanding the algorithm.

I have the following script so far, but don't know how to get an image
back out of my calculated Cum. Dist. Function S:
...
I dont understand what do do from here. Can anyone give me a hint/
pointer?

Use the cumulative distribution function as
a look-up table. Look up "look-up table".

You have done all the difficult stuff. You
are almost home.


Martin,

Thanks for the reply. I looked up 'look-up table and this appears to
be a Simulink thing---whcih I am cannot use. (unless I didn't follow
what I was reading.

You say the hard part is done...

does this mean that:

new_pixel_intensity(x,y) = old_pixel_intensity(x,y) * CDF(of old pixel
intensity)?

Thanks,

Bo
.

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