Adaptive filtering for nonuniformity correction in infrared focal plane arrays

An scene-based nonuniformity correction (NUC) method for infrared focal plane arrays (IRFPA) is presented. The method is based on an optimal recursive estimation based on a fast form of the adaptive filter. The infrared image sequences are input into an adaptive Alter. After certain times recursion calculations are executed frame by frame, the optimal coefficients of the gain and the offset of detector in IRFPA are achieved. Then the NUC is fulfilled ultimately. The algorithm is adaptive to the response drift and achieves higher NUC precision, which are validated by using real infrared image sequences.