US5452011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for film-mode detection and field elimination
Assignee: Technicolor USA Inc
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Filing: 1994-03-14
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Granted: 1995-09-19
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Expires: 2014-03-14
Abstract
Abstract A method for determining which of similar video fields may be excised to enhance video signal compression evaluates parameters of four successive fields denoted 0, 1, 2, and 3. Accumulated differences d(0, 2) and d(1,3) of corresponding pixels in successive frames are generated. In addition a determination is made whether fields 1 and 2 exhibit interlace characteristics. If they do not exhibit interlaced characteristics, a comparison is made of d(0, 2) and d(1, 3). If d(0, 2) is less than d(1, 3) by a predetermined amount, field 2 is excised from the signal stream and a code is generated to condition a receiver to display two of the remaining four fields in a three field interval. Subsequently the latter two fields of the set of 0, 1, 2 and 3 fields, and the next two occurring fields are similarly analyzed.
Inventors
- 👤 Alix Martin
- 👤 Michael Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:43
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/257; H04N7/00; H04N7/12; H04N7/122; H04N19/00; H04N19/46; H04N19/85; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A method for determining which of fields in a sequence of fields of video signal may be excised to enhance signal processing if respective field pairs do not exhibit interlace characteristics, said method comprising: for a sequence of four successive fields 0, 1, 2, 3; generating accumulated differences d(0, 2) and d(1,3) of corresponding pixels in successive frames; determining whether fields 1 and 2 exhibit interlaced characteristics; if fields 1 and 2 do not exhibit interlaced characteristics, comparing the accumulated differences d(0, 2) and d(1, 3); and if d(0, 2) are less than d(1, 3) by a predetermined amount, excising the third occurring field 2.
Claim 2
Independent Claim
105 words
A method for determining which of fields in a sequence of fields of video signal may be excised to enhance signal processing if respective field pairs do not exhibit interlace characteristics, said method comprising: for a sequence of four successive fields 0, 1, 2, 3; generating accumulated differences d(0, 2) and d(1,3) of corresponding pixels in successive frames; determining whether fields 1 and 2 exhibit interlaced characteristics; if fields 1 and 2 do not exhibit interlaced characteristics, comparing the accumulated differences d(0, 2) and d(1, 3); and if d(0, 2) are less than d(1, 3) by a predetermined amount, excising the third occurring field 2.
Claim 3
Dependent Claim
61 words
The method set forth in claim 1 further comprising; if d(0, 2) are less than d(1, 3) by said predetermined amount, grouping fields 0 and 1 of the four field sequence as a video frame and generating a code to condition a receiver to display fields 0 and 1 in a field sequence 0, 1, 0 in a three field interval.
Claim 4
Dependent Claim
108 words
The method set forth in claim 1 further comprising: generating accumulated differences d(1, 2) between vertically aligned pixels in successive interlaced lines of fields 1 and 2 and generating accumulated differences d(2, 3) between vertically aligned pixels in successive interlaced lines of fields 2 and 3; and on the condition that the accumulated differences d(0, 2) are not less than d(1, 3) by said predetermined amount, comparing the accumulated differences d(1, 2) and d(2, 3); and if the accumulated differences d(1, 2) are less than the accumulated differences d(2, 3) by a further predetermined amount, excising field 0 of said sequence of fields 0, 1, 2 and 3.
Claim 5
Dependent Claim
70 words
The method set forth in claim 3 further comprising: on the condition that the accumulated differences d(1, 2) are less than the accumulated differences d(2, 3) by said predetermined amount, grouping fields 1 and 2 of the four field sequence as a video frame and generating a code to condition a receiver to display fields 1 and 2 in a field sequence 2, 1, 2 in a three field interval.
Claim 6
Dependent Claim
78 words
The method set forth in claim 2 further comprising: on the condition that the accumulated differences d(0, 2) are not less than d(1, 3) by said predetermined amount, and that the accumulated differences d(1, 2) are not less than the accumulated differences d(2, 3) by said further predetermined amount, grouping fields 0 and 1 as a frame and generating a code to condition a receiver to display fields 0, 1 in a two field sequence of 0, 1.
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) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |