Two dimensional optical phase grating filter

Details Two dimensional optical phase grating filter Two dimensional optical phase grating filter

1976-01-20

1978-04-11

Stern, Ronald J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 44, G02B 518, G02B 520, H04N 906

Patent

active

040836274

ABSTRACT:
A two dimensional optical phase grating filter is provided that is capable of limiting the transmittance of spacial frequency signals in one or more scan directions. The two dimensional grating of the present invention can be utilized as an optical low pass filter to improve image resolution in a color video system. In the color video system, the two dimensional grating filter could be designed to optically complement a dichroic stripe filter to prevent the introduction of spurious signals by any interference of luminance and chrominance signals. The design parameters of the present invention provide an improved cut-off characteristic with grating widths larger than one-half of the filter period. The two dimensional phase grating filter of the present invention can also be utilized in other optical systems, such as an automatic focusing system, where it is desired to pass only a certain spacial frequency as a monitored signal for the automatic adjustment of the focus of the optical system.

REFERENCES:
patent: 3940788 (1976-02-01), Abe et al.

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