I implemented a method of sharping in the frequency domain related to image processing , but i didn't find any article that talk about that to refer it in my article
Well Mohammed , I have no paper , to narrow down your search , check under contrast .
Normally frequency content measure (in images) is a MTF /OTF that relates to contrast. Contrast also => color => wavelength => Just noticeably difference(JND) aspect of the contents.
Contrast enhancement -This is really a tough nut to crack !!!