Methods for emulation, fitting a per-pixel polynomial (y=a0+a1*x+…ak*x^k) for m measurements is provided, where x is a known independent variable (temperature, flux), and y is the pixels response). Centering and scaling of the x variable is accommodated. Additionally, a power-law can also be fit in the forward direction. For correction, a polynomial is used to drive the response to the desired, (ymed=a0+a1*y+…ak*y^k), where y is the pixels response, and ymed is the desired response.
Additional details of methods and rationale found in:
Nonlinear Pixel Non-Uniformity: Emulation and Correction, SPIE DCS 2019
David Haefner (2020). Nonlinear Non-Uniformity Correction and Emulation (https://www.mathworks.com/matlabcentral/fileexchange/71175-nonlinear-non-uniformity-correction-and-emulation), MATLAB Central File Exchange. Retrieved .
Fixed application of forward model linear NUC
Inspired: IR Noise Evaluation