Electronically variable MTF filter for image sensor arrays

Details Electronically variable MTF filter for image sensor arrays Electronically variable MTF filter for image sensor arrays

1988-08-04

1989-10-31

Miller, Stanley D.

350335, 35016212, G02F 113, G02B 2742

Patent

active

048773107

ABSTRACT:
A liquid crystal birefringent MTF filter is permanently positioned between lens and array of an image input scanner to reduce image modulation at frequencies where moire occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used. In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.

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