Single frame color encoding/decoding system

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

350162SF, H04N 584, G02B 518

Patent

active

039685152

ABSTRACT:
A single frame color encoding/decoding system for video cassette or film chain applications is disclosed which requires neither an unusually stable transport mechanism, nor a color television camera in the playback system. The color content of the scene modulates two high frequency (e.g., 1,000 lpi) spatial carriers in the encoded transparency arranged in quadrature. A monochromatic light source projects, a seriatim, a set of transparencies. A grating is rigidly fixed to the frame of a scanner adjacent to the transparency. The grating consists of a superposition of two unmodulated low frequency (e.g., 300 and 400 lpi) spatial carriers also oriented in quadrature. The color content of the scene is optically transferred from the transparency onto relatively stable and low frequency spatial carriers of the grating. A focusing lens, situated along the optical path, obtains a diffraction pattern of the product of the transparency and the grating in the Fourier transform plane. A suitable mask allows each color component, modulating only one of the spatial carriers of the grating, to pass beyond the transform plane. An imaging lens images the scene color content, carried on the stable and low frequency (e.g. 300 and 400 lpi) spatial carriers of the grating, on an image plate. The scanner electron beam scans the image plate for translating the spatial frequencies of the grating into corresponding temporal electrical frequencies in the output of the scanner. A frequency selective circuit separates color component information in the output of the scanner.

REFERENCES:
patent: 3421809 (1969-01-01), Lohmann
patent: 3573353 (1971-04-01), Henriques et al.
patent: 3647945 (1972-03-01), Hannan

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