US5406333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for film-mode detection
Assignee: Technicolor USA Inc
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Filing: 1994-03-14
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Granted: 1995-04-11
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Expires: 2014-03-14
Abstract
Abstract A method for determining which of pairs of successive video fields have interlace scan characteristics includes generating accumulated differences FD of pixels in successive lines of respective fields of successive pairs of fields and generating accumulated differences FR of pixels in successive lines of interlaced said pairs of fields. The accumulated differences FD and FR are compared and pairs of said fields are classified as interlaced if the ratio of accumulated differences FR/FD is greater than a predetermined threshold value.
Inventors
- 👤 Alix Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:44
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0112; H04N7/0115; H04N5/00; H04N5/222; H04N5/257; H04N19/00; H04N19/85; H04N7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
Apparatus for determining which pairs of video fields have interlace scan characteristics comprising, means for generating accumulated differences FD of pixels in successive lines of respective fields of successive pairs of fields; means for generating accumulated differences FR of pixels in successive lines of interlaced said pairs of fields; and means for comparing said differences FD and FR and classifying pairs of said fields as interlaced if the ratio FR/FD is greater than a predetermined threshold value.
Claim 2
Dependent Claim
77 words
Apparatus for determining which pairs of video fields have interlace scan characteristics comprising, means for generating accumulated differences FD of pixels in successive lines of respective fields of successive pairs of fields; means for generating accumulated differences FR of pixels in successive lines of interlaced said pairs of fields; and means for comparing said differences FD and FR and classifying pairs of said fields as interlaced if the ratio FR/FD is greater than a predetermined threshold value.
Claim 3
Dependent Claim
65 words
The apparatus set forth in claim 1 further comprising means for accumulating said differences FD and FR over portions of respective fields and generating respective ratios FR/FD for respective portions and classifying pairs of said fields as interlaced if the ratios for a predetermined number of portions are greater than said predetermined threshold, where said predetermined number of portions comprise less than a full field/frame.
Claim 4
Dependent Claim
14 words
The apparatus set forth in claim 2 wherein respective portions comprise 16 horizontal lines.
Claim 5
Dependent Claim
15 words
The apparatus set forth in claim 2 wherein said predetermined number of portions is three.
Claim 6
Dependent Claim
49 words
The apparatus set forth in claim 1 wherein said means for generating accumulated differences FD of pixels in successive lines of respective pairs of fields and accumulated differences FR of pixels in successive lines of interlaced said pairs of fields, generates such differences for mutually exclusive pairs of lines.
Claim 7
Independent Claim
76 words
A method for determining which of pairs of successive video fields have interlace scan characteristics comprising: generating accumulated differences FD of pixels in successive lines of respective fields of successive pairs of fields; generating accumulated differences FR of pixels in successive lines of interlaced said pairs of fields; comparing said differences FD and FR and classifying pairs of said fields as interlaced if the ratio of accumulated differences FR/FD is greater than a predetermined threshold value.
Claim 8
Independent Claim
76 words
A method for determining which of pairs of successive video fields have interlace scan characteristics comprising: generating accumulated differences FD of pixels in successive lines of respective fields of successive pairs of fields; generating accumulated differences FR of pixels in successive lines of interlaced said pairs of fields; comparing said differences FD and FR and classifying pairs of said fields as interlaced if the ratio of accumulated differences FR/FD is greater than a predetermined threshold value.
Claim 9
Dependent Claim
64 words
The method set forth in claim 6 further comprising: accumulating said differences FD and FR over portions of respective fields; generating respective ratios FR/FD for respective portions; and classifying pairs of said fields as interlaced if the ratios FR/FD for a predetermined number of said portions are greater than said predetermined threshold, where said predetermined number of portions comprise less than a full field/frame.
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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) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |