Thread Subject: contrast calculation

Hi,

I am a graduate student, I have been using matlab on my research. I could
not find the idea of calculating the contrast of still digital image. Could
you plase help me by guiding the procedure for finding the contrast
calculating procedure from the digital image. Your help could be effective
for completion of my research. thank you. See you soon. Bye.

Rajib Pokhrel
University of Incheion
South Korea.

for gray image,that's to say the value of every point is between 0-255,
do a operation ImageContrast = 255-ImageOrginal.
Is it right?

rajib pokhrel wrote:
> Hi,
>
> I am a graduate student, I have been using matlab on my research. I could
> not find the idea of calculating the contrast of still digital image. Could
> you plase help me by guiding the procedure for finding the contrast
> calculating procedure from the digital image. Your help could be effective
> for completion of my research. thank you. See you soon. Bye.
>
> Rajib Pokhrel
> University of Incheion
> South Korea.

rajib pokhrel wrote:
> I am a graduate student, I have been using matlab on my research. I could
> not find the idea of calculating the contrast of still digital image. Could
> you plase help me by guiding the procedure for finding the contrast
> calculating procedure from the digital image. Your help could be effective
> for completion of my research. thank you. See you soon. Bye.

I don't know whether there exists a conventional mathematical
definition of "contrast", but I would think that any decent measure of
dispersion (image in X: var(X(:)) or std(X(:)) in MATLAB base or
iqr(X(:)) in the Statistics Toolbox) might serve as a reasonable
measure of contrast.

You might also try asking over in sci.image.processing.

-Will Dwinnell
http://will.dwinnell.com