Based on the S-curve model of the detector response of infrared focal plan arrays (IRFPAs), an improved two-point correction algorithm is presented. The algorithm first transforms the nonlinear image data into linear data and then uses the normal two-point algorithm to correct the linear data. The algorithm can effectively overcome the influence of nonlinearity of the detector's response, and it enlarges the correction precision and the dynamic range of the response. A real-time imaging-signal-processing system for IRFPAs that is based on a digital signal processor and field-programmable gate arrays is also presented. The nonuniformity correction capability of the presented solution is validated by experimental imaging procedures of a 128×128 pixel IRFPA camera prototype.
© 2005 Optical Society of America
(040.1520) Detectors : CCD, charge-coupled device
(040.3060) Detectors : Infrared
(100.2550) Image processing : Focal-plane-array image processors
(110.3080) Imaging systems : Infrared imaging
Huixin Zhou, Shangqian Liu, Rui Lai, Dabao Wang, and Yubao Cheng, "Solution for the nonuniformity correction of infrared focal plane arrays," Appl. Opt. 44, 2928-2932 (2005)