Abstract
Pupil plane filtering by optical masks on the pupil of imaging systems is a simple, convenient real time technique for tailoring of both the point spread function (PSF) on the transverse image plane and the distribution of axial intensity around the image plane. Analysis and synthesis of these masks is facilitated by the use of radial Walsh filters derived from the complete set of normal orthogonal Walsh functions that take on values either +1 or −1 over different subdomains of the domain over which the set of Walsh functions are defined.
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