Nonuniformity correction for internal radiation in uncooled infrared imaging based on gradient-weighted guided image filtering.

Due to the absence of a cold screen, the performance of uncooled infrared focal plane array imaging is significantly affected by internal radiation caused by optical systems or cavities during long-term operation. Previous nonuniformity correction methods have struggled to effectively eliminate fixed-pattern noise resulting from internal radiation. The paper explores an internal radiation correction method termed GWGF-IR, which utilizes a gradient-weighted guided image filter to correct spatially continuous fixed-pattern noise (FPN) in uncooled infrared focal plane array imaging systems.