Image resolution is the primary parameter for performance characterization of any imaging system. In this work, we present an axiomatic approach for quantification of image resolution, and demonstrate that a good image resolution measure should be proportional to the standard deviation of the point spread function of an imaging system.
& Li, Y.
(1999). Axiomatic Approach for Quantification of Image Resolution. Signal Processing Letters, IEEE, 6 (10), 257-258.