Patent US4789893A successfully refreshed from Google Patents.
US4789893A
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Interpolating lines of video signals
Assignee: British Broadcasting Corp
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Filing: 1987-10-28
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Granted: 1988-12-06
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Expires: 2007-10-28
Abstract
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.
Inventors
- 👤 Martin Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A method of interpolating missing lines of a line scanned video signal using lines from more than one field, comprising the steps of: deriving the low vertical frequency components of a missing line substantially from the current field; deriving higher vertical frequency components of a missing line partly from the current field and partly from one or more adjacent fields; and combining the said high and low vertical frequency components to produce the said missing line.
Claim 2
Independent Claim
76 words
A method of interpolating missing lines of a line scanned video signal using lines from more than one field, comprising the steps of: deriving the low vertical frequency components of a missing line substantially from the current field; deriving higher vertical frequency components of a missing line partly from the current field and partly from one or more adjacent fields; and combining the said high and low vertical frequency components to produce the said missing line.
Claim 3
Dependent Claim
18 words
A method according to claim 1, in which the total contribution from the current field is substantially unity.
Claim 4
Independent Claim
17 words
A method according to claims 1, in which the total contribution from adjacent fields is substantially zero.
Claim 5
Dependent Claim
77 words
Apparatus for interpolating missing lines of a line scanned video signal using lines from more than one field, comprising; input means for receiving an input video signal; and signal deriving means coupled to the input means for deriving low vertical frequency components substantially from the current field and for deriving higher vertical frequency components partly from the current field and partly from one or more adjacent fields and for combining the said low and high frequency components.
Claim 6
Dependent Claim
77 words
Apparatus for interpolating missing lines of a line scanned video signal using lines from more than one field, comprising; input means for receiving an input video signal; and signal deriving means coupled to the input means for deriving low vertical frequency components substantially from the current field and for deriving higher vertical frequency components partly from the current field and partly from one or more adjacent fields and for combining the said low and high frequency components.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 4, in which total contribution in the output signal from the current field is substantially unity.
Claim 8
Dependent Claim
20 words
Apparatus according to claim 4, in which the total contribution in the output signal from adjacent fields is substantially zero.
Claim 9
Dependent Claim
23 words
Apparatus according to claim 4, in which the signal deriving means includes multiple-line delay devices for making signals from interlaced fields simultaneously available.
Claim 10
Dependent Claim
26 words
Apparatus according to any of claim 4, in which the signal deriving means includes single-line delay devices for making successive lines within a field simultaneously available.
Claim 11
Dependent Claim
36 words
Apparatus according to claim 4, in which the signal deriving means includes: subtractors arranged to separate high vertical frequency components from low vertical frequency components; and multipliers for applying weighting factors to the high frequency components.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |