Method and apparatus for film weave correction

Details Method and apparatus for film weave correction Method and apparatus for film weave correction

1977-01-24

1978-08-01

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358214, 358216, H04N 336, H04N 586

Patent

active

041046803

ABSTRACT:
A method and apparatus for film weave correction is disclosed in connection with a moving beam-type recorder or flying spot scanner device having a continuous-motion film drive in which the film is edge-guided rather than sprocket hole-guided as during playback. The film weave correction apparatus causes the beam to sweep, at least once for each frame being scanned, horizontally across a sprocket hole defined in the film adjacent to the frame. A detector behind the film detects the beams's crossing of the sprocket hole edge. The apparatus compares the time of occurrence of this edge crossing with a reference time and generates therefrom a film weave correction signal. This signal is applied to the horizontal deflection circuitry of the device and causes the beam to be shifted in such a way that the horizontal position of each scanned frame remains constant with respect to the position of the adjacent sprocket hole rather than with respect to the film edge or film guide.

REFERENCES:
patent: 3234326 (1966-02-01), Goldmark et al.
patent: 3780222 (1973-12-01), Pickstock et al.
patent: 3856987 (1974-12-01), McMann et al.

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