SIMULTANEOUS CARTESIAN COORDINATE DISPLAY OF DEFOCUSED OPTICAL TRANSFER-FUNCTIONS

We show that by using a binary spatial filter and a square-law detecto r we can display all the defocused optical transfer functions (OTF's) in a given study in a single picture. The resulting unique picture has as its horizontal coordinates the spatial frequency and as its vertic al coordinates the amount of defocus. The gray-level variations are pr oportional to the modulus of the OTF, that is, the modulation transfer function. Numerical simulations are included. (C) 1998 Optical Societ y of America OCIS codes: 330.6110, 100.1390, 110.4100.