Before revision: where: C = corrected image R = raw image F = flat field image D = dark field or dark frame m = image-averaged value of ( F-D ) G = Gain = In this equation, capital letters are 2D matrices, and lowercase letters are scalars.
After revision: where: C = corrected image R = raw image F = flat field image D = dark field or dark frame m = image-averaged value of ( F−D ) G = Gain = In this equation, capital letters are 2D matrices, and lowercase letters are scalars.