Interpolation of scan lines from video signals having interlaced

Details Interpolation of scan lines from video signals having interlaced Interpolation of scan lines from video signals having interlaced

1989-07-14

1991-06-04

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358140, H04N 1120, H04N 701

Patent

active

050218700

ABSTRACT:
Interpolated scan lines are produced in response to received video signals which are comprised of conventional interlaced scan lines constituting successive fields. A delay circuit, preferably formed of field memory devices, such as three cascaded field memories, functions to delay the received video signals to provide a first scanned line signal in a given field, the next succeeding scan line signal in that field, an interlaced scan line signal in the next succeeding field and an interlaced scan line signal in the next preceding field. A first combining circuit combines the signal values of the next succeeding field interlaced scan line signal and the next preceding field interlaced scan line signal to form a first combined scan line signal. A second combining circuit combines the signal values of the first scan line signal in the given field and the next succeeding scan line signal in that field to form a second combined scan line signal. The first and second combined scan line signals are level adjusted and added to produce an interpolated scan line signal intermediate successive main scan lines in the given field.

REFERENCES:
patent: 4322750 (1982-03-01), Lord et al.
patent: 4626891 (1986-12-01), Achiha
patent: 4677483 (1987-06-01), Dischert et al.
patent: 4785351 (1988-11-01), Ishikawa

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