Re: help_standardizing images

Posted by Gabriel Landini on Apr 25, 2007; 8:37am
URL: http://imagej.273.s1.nabble.com/help-standardizing-images-tp3699688p3699691.html

On Wednesday 25 April 2007 02:59:09 Ryan Garrick wrote:
> I haven't yet played around with equalization (or stretching, as
> mentioned by Gabriel) that much, but might need to because although the
> graycard in my reference image has a histogram of gray values with an
> approx. normal distribution, the graycards in some of  target images give
> a histogram with a slightly longer upper tail (c.f. a normal
> distribution).

Is your test card made of a number of squares?
If so, then wouldn't you expect to get a histogram with equally high (but
narrow) peaks for the greyscale values of each tablet samples?

Can you post an image of your imaged test card?

Cheers,

G.