US5257102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television standards converters using motion vectors corresponding to correlation of horizontal and vertical pixel offsets
Assignee: Sony United Kingdom Ltd
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Filing: 1992-01-15
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Granted: 1993-10-26
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Expires: 2012-01-15
Abstract
Abstract A television standards converter for converting an input digital video signal from one television standard to another, comprises a first low-pass filter (35) for filtering the input video signal, a high-pass filter (36) for filtering the low-pass filtered input video signal horizontally and vertically, a plurality of parallel processing channels comprising respective circuits (43 to 58) for determining pixel by pixel of the high-pass filtered video signal the correlation magnitudes for a range of horizontal and vertical pixel offsets, respective second low-pass filters (59) for filtering the resulting correlation magnitudes, a selector (62) for determining for each pixel of said video signal the motion vector corresponding to the maximum correlation magnitude, and a temporal interpolator (FIG. 14) for deriving interpolated fields or frames by combining sample values offset by the motion vectors.
Inventors
- 👤 James H. Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135; H04N7/014
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A television standards converter for converting an input digital video signal from one television standard to another, the standards converter comprising: a first low-pass filter for filtering said input video signal; a high-pass filter for filtering said low-pass filtered input video signal horizontally and vertically; a plurality of parallel processing channels comprising respective means for determining pixel by pixel of the high-pass filtered video signal the correlation magnitudes for a range of horizontal and vertical pixel offsets; respective second low-pass filters for filtering the resulting said correlation magnitudes; means for determining for each pixel of said video signal the motion vector corresponding to the maximum correlation magnitude; and a temporal interpolator for deriving interpolated fields or frames by combining sample values offset by said motion vectors.
Claim 2
Dependent Claim
126 words
A television standards converter for converting an input digital video signal from one television standard to another, the standards converter comprising: a first low-pass filter for filtering said input video signal; a high-pass filter for filtering said low-pass filtered input video signal horizontally and vertically; a plurality of parallel processing channels comprising respective means for determining pixel by pixel of the high-pass filtered video signal the correlation magnitudes for a range of horizontal and vertical pixel offsets; respective second low-pass filters for filtering the resulting said correlation magnitudes; means for determining for each pixel of said video signal the motion vector corresponding to the maximum correlation magnitude; and a temporal interpolator for deriving interpolated fields or frames by combining sample values offset by said motion vectors.
Claim 3
Dependent Claim
45 words
A converter according to claim 1 wherein f.sub.0 <f.sub.s- 2f.sub.1 where f o is the cut-off frequency of said respective low-pass filters, f 1 is the cut-off frequency of said first low-pass filter, and f s is the sampling frequency of said input video signal.
Claim 4
Dependent Claim
18 words
A converter according to claim 1 wherein said high-pass filter and said second low-pass filters are one-dimensional filters.
Claim 5
Dependent Claim
15 words
A converter according to claim 1 wherein said high-pass filter is a Hilbert type filter.
Claim 6
Dependent Claim
18 words
A converter according to claim I wherein said high-pass filter and said second low-pass filters are two-dimensional filters.
Claim 7
Dependent Claim
20 words
A converter according to claim 5 wherein said high-pass filter and said low-pass filters are symmetrical finite impulse response filters.
Claim 8
Dependent Claim
26 words
A converter according to claim 1 wherein in determining said motion vectors a scaling factor is applied progressively to attenuate motion vectors of relatively large value.
Claim 9
Dependent Claim
27 words
A converter according to claim 1 wherein in determining said motion vectors a threshold value proportional to the vector magnitude is subtracted from each said motion vector.
Claim 10
Dependent Claim
32 words
A converter according to claim 1 wherein said input video signal is converted from an interlaced digital video signal to a progressive scan digital video signal before derivation of said motion vectors.
Claim 11
Dependent Claim
117 words
A converter according to claim 9 further comprising: a third low-pass filter for filtering said input interlaced video signal; a second high-pass filter for filtering said low-pass filtered input interlaced video signal; a second plurality of parallel processing channels comprising respective means for determining pixel by pixel of the low-pass filtered interlaced video signal the correlation magnitudes for a range of pixel offsets; respective fourth low-pass filters for filtering the resulting said correlation magnitudes; means for determining for each pixel of said interlaced video signal the gradient vector corresponding to the maximum correlation magnitude; and a spatial interpolator for deriving interpolated frames of said progressive scan video signal by combining sample values offset by said gradient vectors.
Claim 12
Dependent Claim
47 words
A converter according to claim 10 wherein f.sub.o <f.sub.s- 2f.sub.1 where f o is the cut-off frequency of said respective fourth low-pass filters, f 1 is the cut-off frequency of said third low-pass filter, and f s is the sampling frequency of said input interlaced video signal.
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) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |