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Enhancement of multiple images by sampling spatial filtering using additional auxiliary sampling

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Abstract

A method is derived for obtaining more-intense multiple images. The method is based upon spatial-frequency filtering with auxiliary sampling. This method is derived and realized physically. The spatial filter, composed of periodically spaced holes in a black screen, is placed in the Fourier plane of the two-dimensional object. Filters were used that included auxiliary lattices of the same period, translated from each other by arbitrary vectors; consequently the multiple images that are formed in the image plane are superimposed and reinforce each other.

© 1975 Optical Society of America

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