Digital method for defocus corrections: experimental results

One of the main features of modern cameras is their ability to perform a me chanical autofocus and capture a sharp image. Experimental results for misf ocusing corrections by fast and exact numerical postprocessing algorithms a re presented. Furthermore, the optical transfer function (OTF) for a defocu sed circular pupil with an arbitrary diameter is presented. These methods a re based on the wave optics and, thus, are more realistic than ray optics b ased methods. (C) 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(99)01510-X].