FPN tends to become noticeable in longer exposure shots wherein certain pixels become more susceptible to giving brighter intensities than average. The term FPN itself refers to two parameters dark signal non-uniformity and photo response non-uniformity which respectively describe the offset from average across the imaging array at a particular setting and the ratio between optical power and electrical signal output of a given pixel.
FPN tends to become noticeable in longer exposure shots wherein certain pixels become more susceptible to giving brighter intensities than average. The term FPN itself refers to two parameters dark signal non-uniformity and photo response non-uniformity which respectively describe the offset from average across the imaging array at a particular setting and the ratio between optical power and electrical signal output of a given pixel.