Patent US5347314A successfully refreshed from Google Patents.
US5347314A
Expired / Lapsed
US
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Video scan converter
Assignee: Faroudja Laboratories Inc
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Filing: 1992-09-30
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Granted: 1994-09-13
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Expires: 2012-09-30
Abstract
Abstract A video scan converter includes an input for receiving a video signal at a first scan rate, an output for providing a video signal at a second scan rate and a main path leading between the input and the output. The main path includes a scan line interpolation circuit and a time scale modification circuit which provide conventional two-dimensional scan conversion. A further path coupled to the main path dynamically alters the output of the scan line interpolation circuit in response to motion in the picture represented by the video signal, thus providing a three-dimensional scan conversion. The further path may be optional.
Inventors
- 👤 Yves C. Faroudja
- 👤 Charles A. Bialo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:28
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012; Y; Y10; Y10S; Y10S348/00; Y10S348/911
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
125 words
An expansible video scan converter comprising: input means for receiving a video signal at a first scan rate, output means for providing said video signal at a second scan rate, a main signal path coupling said input means and said output means, said main signal path including line interpolation means for interpolating pixels in original scan lines of said video signal and for putting out interpolated scan lines comprised of pixels interpolated in the spatial domain, time scale modification means for combining original and interpolated scan lines into a video signal at the second scan rate, and optional further path insertion means between the line interpolation means and the time scale modification means, and removable connecting path means bridging the optional further path insertion means.
Claim 2
Dependent Claim
125 words
An expansible video scan converter comprising: input means for receiving a video signal at a first scan rate, output means for providing said video signal at a second scan rate, a main signal path coupling said input means and said output means, said main signal path including line interpolation means for interpolating pixels in original scan lines of said video signal and for putting out interpolated scan lines comprised of pixels interpolated in the spatial domain, time scale modification means for combining original and interpolated scan lines into a video signal at the second scan rate, and optional further path insertion means between the line interpolation means and the time scale modification means, and removable connecting path means bridging the optional further path insertion means.
Claim 3
Dependent Claim
123 words
A video scan converter comprising: input means for receiving a video signal at a first scan rate, output means for providing said video signal at a second scan rate, a signal path coupling said input means and said output means, said signal path including interpolation means for interpolating pixels in original scan lines of said video signal and for putting out interpolated scan lines comprised of pixels interpolated in the spatial domain, time scale modification means for combining original and interpolated scan lines into a video signal at the second scan rate, and means for selectively modifying said spatial domain interpolated pixels as a function of temporal detail in said video signal, whereby said interpolated scan lines are both spatially and temporally interpolated.
Claim 4
Dependent Claim
123 words
A video scan converter comprising: input means for receiving a video signal at a first scan rate, output means for providing said video signal at a second scan rate, a signal path coupling said input means and said output means, said signal path including interpolation means for interpolating pixels in original scan lines of said video signal and for putting out interpolated scan lines comprised of pixels interpolated in the spatial domain, time scale modification means for combining original and interpolated scan lines into a video signal at the second scan rate, and means for selectively modifying said spatial domain interpolated pixels as a function of temporal detail in said video signal, whereby said interpolated scan lines are both spatially and temporally interpolated.
Claim 5
Dependent Claim
38 words
A converter according to claim 1 or 2 wherein the second scan rate of the video signal provided by said output means is higher than the first scan rate of the video signal received by the input means.
Claim 6
Dependent Claim
50 words
A converter according to claim 1 or 2 wherein said line interpolation means interpolates pixels in accordance with the relation (A+B)/2 wherein A is a first location along a first scan line, and B is a second location along a second scan line substantially aligned vertically with the first location.
Claim 7
Dependent Claim
46 words
A converter according to claim 1 or 2 wherein said time scale modification means operates to provide a second scan rate which si twice the first scan rate, whereby the video signal at said second scan rate is suitable for use by a progressively scanned reproducer.
Claim 8
Dependent Claim
57 words
A converter according to claim 1 or 2 wherein said time scale modification means operates to provide a second scan rate which is approximately twice the first scan rate but is slightly different from twice the first scan rate, whereby the video signal at said second scan rate is suitable for use by an interlace scanned reproducer.
Claim 9
Dependent Claim
28 words
A converter according to claim 1 or 2 wherein said time scale modification means operates to provide a second scan rate suitable for use by computer system monitors.
Claim 10
Dependent Claim
55 words
A converter according to claim 1 wherein the removable connecting path means is opened and further comprising means for selectively modifying said spatial domain interpolated pixels as a function of temporal detail in said video signal coupled to said optional further path insertion means, whereby said interpolated scan lines are both spatially and temporally interpolated.
Claim 11
Dependent Claim
69 words
A converter according to claim 2 wherein said video signal is a television signal and further comprising film mode detection means for detecting when the information represented by the television signal is a motion picture film, wherein said film mode detection means applies to said time scale modification means scan lines from either the prior television field or the subsequent television field in lieu of said interpolated scan lines.
Claim 12
Dependent Claim
46 words
A converter according to claim 2, 8 or 9 wherein said means for selectively modifying said spatial domain interpolated pixels as a function of temporal detail in said video signal also modifies said spatial domain interpolated pixels as a function of motion in said video signal.
Claim 13
Dependent Claim
51 words
A converter according to claim 10 wherein said means for selectively modifying said spatial domain interpolated pixels determines motion in the video signal as a function of motion speed and/or the amplitude of the object in motion relative to the background and/or the relative size of the picture area in motion.
Claim 14
Dependent Claim
32 words
A converter according to claim 10 wherein said means for selectively modifying said spatial domain interpolated pixels modifies said spatial domain interpolated pixels progressively less as motion in the video signal increases.
Claim 15
Dependent Claim
51 words
A converter according to claim 12 wherein for no motion in the video signal said signal responsive to temporal detail in the video signal is not reduced and for full motion in the video signal said signal responsive to temporal detail in the video signal is reduced to a minimum level.
Claim 16
Dependent Claim
12 words
A converter according to claim 13 wherein said minimum level is zero.
Claim 17
Dependent Claim
43 words
A converter according to claim 10 wherein said means for selectively modifying said spatial domain interpolated pixels includes means for generating a correction signal and means for combining said correction signal with said pixels interpolated in the spatial domain in said signal path.
Claim 18
Dependent Claim
29 words
A converter according to claim 15 wherein said correction signal is derived from the video scan immediately prior to the video scan sequence received by said line interpolation means.
Claim 19
Dependent Claim
27 words
A converter according to claim 16 wherein said video signal is a television signal and the immediately prior video scan sequence is the immediately prior television field.
Claim 20
Dependent Claim
32 words
A converter according to claim 15 wherein said correction signal is derived from the video scan sequences prior to and subsequent to the video scan sequence received by said line interpolation means.
Claim 21
Dependent Claim
41 words
A converter according to claim 18 wherein aid video signal is a television signal, and the video scan sequences prior to and subsequent to the video scan sequence received by the line interpolation means are the prior and subsequent television fields.
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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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |