Revision as of 11:12, 23 March 2016 edit Bart dierickx (talk \| contribs) 21 edits m corrected the use of PRNL in vie of PRNU; added the subdivision of DSNU in offset FPN and DSNU. ← Previous edit		Revision as of 11:16, 23 March 2016 edit undo Bart dierickx (talk \| contribs) 21 edits m added the often used method CDS that applies only to offset FPN. Next edit →
Line 12: FPN is commonly suppressed by [[flat-field correction]] (FFC) that uses DSNU and PRNU to linearly interpolate and reduce the local photo response (non-uniform PRNL) to the array average. Hence, two exposures with an equal illumination across the array are necessary (one without light and one close to saturation) to obtain the values. Note that this correction usually is very sensitive to modifications of the system parameters (i.e., exposure time, temperature). The main challenge is to generate a flat field illumination for short time exposures and wavelengths, to avoid [[speckle noise\|speckle]] (in monochromatic light conditions) and statistical fluctuations of the light stream that become most obvious at short integration times. Many patents and ~~proposals~~methods exist to reduce or eliminate fixed pattern noise in digital imagers. {{citation needed\|date=July 2013}} . Specific for the suppression of "offset FPN" as defined above, on-chip techniques for suppression exist, such as [[correlated double sampling]]. == See also ==

Fixed-pattern noise: Difference between revisions