Electronically variable MTF filter for image sensor arrays

A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré occurs, with a source of electric potential and a control switch for selectively applying the potential...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	DIR, GARY A, TAILLIE, JOSEPH P, SEACHMAN, NED J
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré 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.