Complex Amplitude Filters for Extended Depth of Field

Abstract

We present a complex amplitude transmittance filter that reduces the impact of focus errors on the modulation transfer function (MTF). The new filter combines the use of a cubic phase mask and a Gaussian apodizer, which reduces the oscillations in the MTF. We propose the use of a tendency curve, of several MTFs, for evaluating the departures of the tendency MTF, as a Euclidian distance in hyperspace.

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