LENSLESS ELECTRONIC IMAGING

A theory is presented for image retrieval when a planar transparency i s illuminated by spatially incoherent light that propagates in free sp ace and is then recorded on a CCD array, but without using an imaging lens. Based on Maxwell's equations and Fourier-optical, linear-systems theory, equations are derived for digital processing of this badly bl urred image in order to recover a reasonable facsimile of the original . Rigorous impulse responses and their corresponding transfer function s are presented for the cases of general amplitude illumination and fo r incoherent illumination.