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Coherent Processing and Depth of Focus of Annular Aperture Imagery

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Abstract

Images from high aspect ratio annulus apertures are spatially filtered in a coherent optical processor for equalization of the modulation transfer function. The imagery is relatively insensitive to spherical aberration, field curvature, and longitudinal color; and the depth of focus is substantially greater than that of conventional imagery with comparable resolution.

© 1971 Optical Society of America

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