Film scanner employing optical splice technique for frame-rate c

Details Film scanner employing optical splice technique for frame-rate c Film scanner employing optical splice technique for frame-rate c

1979-08-20

1981-03-10

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 336

Patent

active

042557640

ABSTRACT:
A frame-rate converting film scanner suitable for use with a solid-state line sensing array for producing a television signal from motion picture film is disclosed. The scanner is capable of projecting film at continuously moving projection rates that are not necessarily submultiples of the standard television field rate. The scanner includes a rotating multifacet mirror such as a reflecting polygon that sweeps a succession of images of the moving film past the line scanner at a rate sufficient to cause the line scanner to scan one full frame in the time required for generating a standard television field. Each successive image deflected by the polygon is displaced from the preceding image by one film frame height, whereby, the transition from one image to the next, as the successive images sweep across the line scanner, proceeds from a location in one frame to a corresponding location in an adjacent frame. Frame-rate conversion is thus achieved by causing some or all of the video fields to be comprised of portions of scans of adjacent frames of the film.

REFERENCES:
patent: 2258311 (1941-10-01), Adams
patent: 4148071 (1979-04-01), Zinchuk
Wright et al., "Solid State Sensors: The Use of a Single Dimension 512 Element Array for Film Scanning", BBC Research Dept. Report No. 1973/32.
Childs et al., "An Experimental Telecine Using a Line-Array CCD Sensor", SMPTE Journal, Apr. 1978, vol. 87, pp. 209-213.

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