Abstract

An image degraded by linear smear is restored in a spatial filtering setup by using a sinusoidal distribution of amplitude transmittance in the frequency plane. The sinusoidal amplitude distribution is generated with the help of a Wollaston prism and two linear polarizers. The experimental arrangement permits the use of an extended incoherent source (angular width of the order of 2°). This provides redundancy in the image formation process and, consequently, eliminates the disturbing diffraction effects which are always present when highly directed light is used. The retrieved image is significantly improved if the degraded amplitude image is transformed by bleaching into a pure phase image, and the filtering is carried out subsequently. Some restored images are shown.

© 1978 Optical Society of America

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