US5280351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television standards converters for converting an input digital video signal from one television standard to another
Assignee: Sony United Kingdom Ltd
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Filing: 1992-01-15
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Granted: 1994-01-18
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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 high-pass filter (36) for filtering the 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 low-pass filters (59) for filtering the resulting correlation magnitudes, subtracters (55 to 58) for subtracting from each correlation magnitude in the range the correlation magnitude corresponding to zero pixel offset, 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 10:17
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135; H04N7/014
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A television standards converter for converting an input digital video signal from one television standard to another, the standards converter comprising: a high-pass filter for filtering said 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; means for subtracting from each said correlation magnitude in said range the said correlation magnitude corresponding to zero pixel offset thereby producing a resulting correlation magnitude; respective low-pass filters for filtering said resulting correlation magnitudes; means for determining for each pixel of said video signal a motion vector corresponding to the maximum resulting 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
139 words
A television standards converter for converting an input digital video signal from one television standard to another, the standards converter comprising: a high-pass filter for filtering said 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; means for subtracting from each said correlation magnitude in said range the said correlation magnitude corresponding to zero pixel offset thereby producing a resulting correlation magnitude; respective low-pass filters for filtering said resulting correlation magnitudes; means for determining for each pixel of said video signal a motion vector corresponding to the maximum resulting 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
17 words
A converter according to claim 1 wherein said high-pass filter and said low-pass filters are one-dimensional filters.
Claim 4
Dependent Claim
15 words
A converter according to claim 1 wherein said high-pass filter is a Hilbert type filter.
Claim 5
Dependent Claim
17 words
A converter according to claim 1 wherein said high-pass filter and said low-pass filters are two-dimensional filters.
Claim 6
Dependent Claim
20 words
A converter according to claim 4 wherein said high-pass filter and said low-pass filters are symmetrical finite impulse response filters.
Claim 7
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 8
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 9
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 10
Dependent Claim
104 words
A converter according to claim 8 further comprising: a second high-pass filter for filtering said 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 second low-pass filters for filtering the resulting said correlation magnitudes; means for determining for each pixel of said interlaced video signal a 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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |