Double layered optical low pass filter permitting improved image

Details Double layered optical low pass filter permitting improved image Double layered optical low pass filter permitting improved image

1975-06-03

1977-03-01

Stern, Ronald J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350166, 358 44, G02B 518, H04N 906

Patent

active

040099393

ABSTRACT:
A double layered optical low pass filter is provided for use in a color video system for monitoring an object scene. The optical filter is designed to optically complement a dichroic stripe filter to prevent the introduction of spurious signals by any interference between luminance and chrominance signals, while at the same time providing a transmittance of high spatial frequency luminance signal to permit an improved image resolution. The optical low pass filter includes a first phase retarding filter layer designed to provide a first spatial frequency response across the visual spectrum and a second phase retarding filter layer designed to provide a second spatial frequency response across the visual spectrum. The combined resultant optical transfer function of the filter layers disclose a cut off of the higher spatial signal components of the primary color design wavelengths of the respective first and second filter layers, while transmitting a higher spatial frequency for the luminance signal to provide the improved image resolution. The specific cut off spatial frequencies of the primary colors and the bandwidth of the luminance signals can be subjectively optimized for any applicable system.

REFERENCES:
patent: 2733291 (1956-01-01), Kell
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: 3911479 (1975-10-01), Sakurai

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