Fourier-analysis and spatial frequency treatment of optical image formation by 2-D photodetector array are given. A spectral theory of the matrix photodetector accounting for its step-type behavior and crosstalk is developed. The theory gives analytically the expressions for the optical transfer function of matrix photodetectors.
V. P. Fedosov, V. P. Fedosov,
"Spatial frequency analysis of a matrix photodetector", Proc. SPIE 2430, Optical Memory & Neural Networks '94: Optical Neural Networks, (7 December 1994); doi: 10.1117/12.195620; https://doi.org/10.1117/12.195620