Re: Image Gradient

Posted by Gabriel Landini on
URL: http://imagej.273.s1.nabble.com/Image-Gradient-tp3704168p3704170.html

On Thursday 22 December 2005 18:40, Dan Siler wrote:
> I have tried histogram equalization from several software packages but the
> images contain severe vertical banding. I don't know if this is caused by
> how the intensities are mapped to the monitor or graphics card or both.

The bands are due to the the mapping of the input image into the equalised
histogram function which has discrete levels.

If you need to have a smooth histogram without gaps (let's say to do some
histogram fitting) you could add a very tiny small amount of noise to the
image after the equalisation.

Cheers,

Gabriel