To calculate the NUC parameters in SLCNUC, gain and offset in Eq. (3), a range of IR camera internal temperatures was set. The range was divided into a number of sections for sampling, and the internal temperature matrix was selected as Display Formula
(6)For the gain and offset for all pixels at each internal temperature used in the matrix, the true scene irradiance values calculated in Sec. 3.1 were used for the calculation. For example, when the internal temperature was , the calculation of gain and offset at a pixel with coordinates () was performed using Display Formula
(7)Here, refers to the estimated true scene irradiance acquired through Eq. (5) irradiated from the high-temperature blackbody, and refers to estimated true scene irradiance acquired through Eq. (5) irradiated from the low-temperature blackbody. and refer to an observation model at the () coordinate acquired while looking at the high- and low-temperature blackbodies, respectively, when the IR camera’s internal temperature was .