US5491519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-processing filter apparatus for use in an image encoding system
Assignee: WiniaDaewoo Co Ltd
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Filing: 1994-12-16
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Granted: 1996-02-13
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Expires: 2014-12-16
Abstract
Abstract A novel pre-processing filter apparatus for use in an image encoding system, capable of adaptively filtering an input digital video signal, comprises a circuit for delaying a current frame of the input digital video signal by one frame interval; a circuit for generating a difference signal representing the difference between averaged pixel value for N×N pixels of the delayed previous frame and an averaged pixel value for N×N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering circuits arranged in parallel for filtering the input digital video signal, respectively, each of the filtering circuits having different cutoff frequencies; and a control circuit for generating one of the filtered digital video signals in response to the difference signal.
Inventors
- 👤 Jong-Hoon Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:16
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/50; G06T5/20; G06T5/70; H; H04; H04N; H04N19/00; H04N19/80; G06T2207/00; G06T2207/10; G06T2207/10016; G06T2207/20; G06T2207/20004; G06T2207/20008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A pre-processing filter apparatus for use in an image encoding system for adaptively filtering an input digital video signal wherein the input digital video signal includes a plurality of frames, which comprises: means for delaying a current frame of the input digital video signal by one frame interval; means for generating a difference signal representing the difference between an averaged pixel value for N×N pixels (where N is a positive integer) of a previous frame which is the delayed current frame and an averaged pixel value for N×N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering means arranged in parallel for filtering the input digital video signal, respectively, each of said filtering means having different cutoff frequencies; and control means for generating one of the filtered digital video signals in response to the difference signal.
Claim 2
Dependent Claim
148 words
A pre-processing filter apparatus for use in an image encoding system for adaptively filtering an input digital video signal wherein the input digital video signal includes a plurality of frames, which comprises: means for delaying a current frame of the input digital video signal by one frame interval; means for generating a difference signal representing the difference between an averaged pixel value for N×N pixels (where N is a positive integer) of a previous frame which is the delayed current frame and an averaged pixel value for N×N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering means arranged in parallel for filtering the input digital video signal, respectively, each of said filtering means having different cutoff frequencies; and control means for generating one of the filtered digital video signals in response to the difference signal.
Claim 3
Dependent Claim
169 words
An image encoding system for adaptively encoding an input digital video signal wherein said input digital video signal includes a plurality of frames, which comprises: means for delaying a current frame of the input digital video signal by one frame interval; means for generating a difference signal representing the difference between an averaged pixel value for N×N pixels (where N is a positive integer) of a previous frame which is the delayed current frame and an averaged pixel value for N×N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering means arranged in parallel for filtering the input digital video signal, respectively, each of said filtering means having different cutoff frequencies; control means for generating one of the filtered digital video signals in response to the difference signal; and means for eliminating redundancies in the generated filtered digital video signal in order to compress the generated filtered digital video signal to a manageable size for transmission thereof.
Claim 4
Dependent Claim
169 words
An image encoding system for adaptively encoding an input digital video signal wherein said input digital video signal includes a plurality of frames, which comprises: means for delaying a current frame of the input digital video signal by one frame interval; means for generating a difference signal representing the difference between an averaged pixel value for N×N pixels (where N is a positive integer) of a previous frame which is the delayed current frame and an averaged pixel value for N×N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering means arranged in parallel for filtering the input digital video signal, respectively, each of said filtering means having different cutoff frequencies; control means for generating one of the filtered digital video signals in response to the difference signal; and means for eliminating redundancies in the generated filtered digital video signal in order to compress the generated filtered digital video signal to a manageable size for transmission thereof.
References Cited (Backward Citations)
US4754322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-12 | 1999-08-14 | 2000-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-12 | 2003-08-14 | 2004-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-12 | 2007-08-14 | 2008-02-13 | $7700.00 | Window Closed / Lapsed |