Interpolating lines of video signals

Details Interpolating lines of video signals Interpolating lines of video signals

1987-10-28

1988-12-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358140, 358166, H04N 712, H04N 701, H04N 514

Patent

active

047898933

ABSTRACT:
Missing lines of a video signal are interpolated from the signal on three successive fields by deriving low vertical frequency components solely from the central or current field and the higher vertical frequency components partly from the lines of the current field and partly from the lines of two adjacent fields. The total contribution from the current field is unity and the total contribution from each adjacent field is zero. The circuitry for deriving and combining these components comprises an arrangement of delays, adders, subtractors and multipliers (FIG. 7). The system can be used to generate the missing lines necessary to derive a sequentially scanned video signal from an interlaced scan video signal.

REFERENCES:
patent: 4322749 (1982-03-01), Weston
patent: 4335395 (1982-06-01), Clarke
patent: 4393396 (1983-07-01), Raven et al.
patent: 4677461 (1987-06-01), Mizutani et al.
patent: 4730217 (1988-03-01), Tonze et al.

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