METHOD OF COMPENSATING FOR GEOMETRIC NOISE OF PHOTODETECTOR ARRAY, WHICH IS INVARIANT TO EXPOSURE TIME Russian patent published in 2024 - IPC G06T5/00 G06T7/80 H04N25/60 

FIELD: physics.

SUBSTANCE: invention relates to a method of compensating for geometric noise of a photodetector array. In the method, the change in not only the additive but also the change in the multiplicative component GN is taken into account due to additional storage in the digital form of the brightness values of the reference image elements Y_2max, obtained at calibration stage at maximum exposure time t_max and high level of uniform irradiation of photodetector, and determining the multiplicative component compensation coefficients K_max for the maximum exposure time t_max. In turn, using values of coefficients of compensation of multiplicative component K_min and K_max for boundaries of range [t_min; t_max] in the disclosed method, in contrast to the prototype method, additional linear interpolation by formula K=aK_max+(1-a)K_min calculates values of coefficients of compensation of multiplicative component K for set exposure time t. Said operations make it possible to take into account changes of not only additive, but also multiplicative component GN, which occur during change of photodetector exposure time t within t_min≤t≤t_max.

EFFECT: high accuracy of compensating for geometric noise of a photodetector array in the process of two-point correction when changing the exposure time.

1 cl, 3 dwg