Since the original information (digital numbers DN) can be converted to backscatter (sigma0) values, or even to sigma0 in dB: what type of image information should I use for digital image processing? What value(s) is(are) better for image processing? or are the three (DN, sigma0, sigma0 dB) equally accepted and just depend on my application? I must add that I’m not interested in using classification linked to a specific value of backscatter from a structure, I want to use segmentation and classification procedures that rely mainly in gray level values of a scene.
I would greatly appreciate any help. Thank you in advance