Thermal imagers are another class of camera with good detection abilities. Sensors Unlimited often recommends that such imagers are a good compliment to SWIR. While thermal imaging can detect the presence of a warm object against a cool background, a SWIR camera can actually identify what that ob...
I've discussed it in post # 25 in that same thread so I won't rehash it here. The point is that flats are required to remove FPN--as well as vignetting. CMOS sensors tend to have a rectilinear/checkerboard FPN pattern whereas CCD tends to have a more column oriented pattern due to ...