I have used 'adapthisteq' function in MATLAB. For writing this function they have referred this below paper.
Zuiderveld, Karel. "Contrast Limited Adaptive Histograph Equalization." Graphic Gems IV. San Diego: Academic Press Professional, 1994. 474–485.
I need to analyze that code by seeing that paper(in terms of equations), but I am unable to find that paper in any site.
Please any one having that paper please send it to me(<mailto:firstname.lastname@example.org email@example.com>) or provide me any links to download that paper.