Abstract
Correction of photoresponse nonuniformity in infrared staring sensor arrays is investigated. A general nonuniformity correction procedure is proposed. The procedure is based on multiple irradiation sources and on least square fit approximations to the individual pixel response characteristics. Nonlinearities of the signal response are taken into account. A correctability figure of merit is defined which may be used to estimate the residual fixed-pattern noise after correction. The correction procedure and the correctability are applied to a real data set measured by a 64 X 64 element infrared focal plane array (FPA). It is shown that an offset correction is insufficient for this data set and that a linear correction reduces the fixed- pattern noise contribution to the magnitude of the temporal noise background. The residual uncorrected fixed pattern noise can be related to pixels showing large temporal noise.
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