Optical low-pass filter

Details Optical low-pass filter Optical low-pass filter

1987-12-16

1989-11-07

Bovernick, Rodney B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 44, 358331, G02B 2700

Patent

active

048787370

ABSTRACT:
An optical low-pass filter for use in the optical system of a color video camera has first and second periodic structures on the same or opposed major surfaces of a transparent substrate and which are dimensioned and arranged in respect to each other to provide a modulation transfer function, in at least the horizontal scanning direction of the camera, which is higher than a predetermined value for frequencies in a range lower than a cut-off spatial frequency and which is low over a range of frequencies extending from the cut-off spatial frequency to substantially more than twice said cut-off spatial frequency.

REFERENCES:
patent: 3756695 (1973-09-01), Mino et al.
patent: 3768888 (1973-10-01), Nishino et al.
patent: 3910683 (1975-10-01), Nishino et al.
patent: 4009939 (1977-03-01), Okano
patent: 4472735 (1984-09-01), Shinozaki et al.

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