EP0266079A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Interpolating lines of video signals
Assignee: British Broadcasting Corp
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Filing: 1987-10-07
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Granted: —
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Expires: 2007-10-07
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 (Figure 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
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:39
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A method of interplating missing lines of a line scanned video signal using lines from more than one field, characterised in that the low vertical frequency components are derived substantially from the current field, and the higher vertical frequency components are derived partly from the current field and partly from one or more adjacent fields.
Claim 2
Independent Claim
55 words
A method of interplating missing lines of a line scanned video signal using lines from more than one field, characterised in that the low vertical frequency components are derived substantially from the current field, and the higher vertical frequency components are derived partly from the current field and partly from one or more adjacent fields.
Claim 3
Dependent Claim
19 words
A method according to claim 1, characterised in that the total contribution from the current field is substantially unity.
Claim 4
Independent Claim
20 words
A method according to claims 1 and 2, characterised in that the total contribution from adjacent fields is substantially zero.
Claim 5
Dependent Claim
79 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 characterised by 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
79 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 characterised by 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
22 words
Apparatus according to claim 4, characterised in that the total contribution in the output signal from the current field is substantially unity.
Claim 8
Dependent Claim
23 words
Apparatus according to claim 4 or 5, characterised in that the total contribution in the output signal from adjacent fields is substantially zero.
Claim 9
Dependent Claim
21 words
Apparatus according to claim 4, 5 or 6 characterised by multiple-line delay devices for making signals from interlaced fields simultaneously available.
Claim 10
Dependent Claim
23 words
Apparatus according to any of claim 4 to 7, characterised by single-line delay devices for making successive lines within a field simultaneously available.
Claim 11
Dependent Claim
33 words
Apparatus according to claim 4 to 8, characterised by 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)
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