US5237413A
Expired / Lapsed
US
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Motion filter for digital television system
Assignee: Cisco Technology Inc
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Filing: 1991-11-19
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Granted: 1993-08-17
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Expires: 2011-11-19
Abstract
Abstract A method and apparatus for processing fields of a video signal that are to be combined into a frame, compressed and communicated over a digital communications system. The processing technique increases the spatial correlation between pixels at a cost of slightly reduced resolution in areas of the frame where there is movement. The method employs a motion detector to separate moving and non-moving areas of the frame. A simple combination of lines from a first field and a second field can be used in static areas. In moving areas, a digital filter is applied to the fields to increase correlation in the resulting field. A digital compression technique such as vector quantization is applied to the resulting frame-based signal.
Inventors
- 👤 Paul D. Israelsen
- 👤 Keith Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:37
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/112; H04N19/132; H04N19/50; H04N19/587; H04N19/80; H04N5/00; H04N5/14; H04N5/144
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
97 words
A method for increasing the correlation between pixels of an image, comprising the steps of: (a) filtering first (X A ) and second (X B ) fields of pixels to produce a filtered field (X B ') with increased correlation to said first field; (b) generating a motion parameter (α) indicative of whether there is motion in said image; (c) generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; and (d) optionally combining said first field with said weighted sum of second and filtered fields to form a frame.
Claim 2
Independent Claim
97 words
A method for increasing the correlation between pixels of an image, comprising the steps of: (a) filtering first (X A ) and second (X B ) fields of pixels to produce a filtered field (X B ') with increased correlation to said first field; (b) generating a motion parameter (α) indicative of whether there is motion in said image; (c) generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; and (d) optionally combining said first field with said weighted sum of second and filtered fields to form a frame.
Claim 3
Dependent Claim
19 words
The method recited in claim 1, wherein said filtering step comprises vertically interpolating adjacent lines of said first field.
Claim 4
Dependent Claim
22 words
The method recited in claim 1, wherein said filtering step comprises vertically and horizontally combining pixels of said first and second fields.
Claim 5
Dependent Claim
49 words
The method recited in claim 1, wherein said step of generating a motion parameter α comprises summing over a prescribed area the absolute difference in value between corresponding pixels in said first field and a third field (X C ) representing the image at a later instant in time.
Claim 6
Dependent Claim
51 words
The method recited in claim 1, wherein said motion parameter α is restricted to values between 0 and 1 and said step of generating a weighted sum of said second and filtered fields comprises weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
Claim 7
Dependent Claim
28 words
The method recited in claim 1, wherein said filtering step comprises computing a weighted sum of adjacent lines of said first field and lines of said second field.
Claim 8
Dependent Claim
35 words
The method recited in claim 6, wherein said filtering step comprises applying approximately an 8 to 1 ratio of weights to said line of said second field and said adjacent lines of said first field.
Claim 9
Dependent Claim
96 words
The method recited in claim 2, 3 or 6, wherein: said step of generating a motion parameter α comprises summing over a prescribed area the difference in value between corresponding pixels in said first field and a third field (X C ) representing the image at a later instant in time; and said motion parameter α is restricted to values between 0 and 1 and said step of generating a weighted sum of said second and filtered fields comprises weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
Claim 10
Independent Claim
133 words
A method for transmitting and/or storing image data, comprising the steps of: (a) generating first and second fields of data (X A , X B ) respectively representative of alternate lines of an image at first and second instants of time; (b) filtering said first (X A ) and second (X B ) fields to produce a filtered field (X B ') with increased correlation to said first field; (c) generating a motion parameter (α) indicative of whether there is motion in said image; (d) generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; (e) combining said first field with said weighted sum of said second and filtered fields to form a frame; (f) compressing said frame; and (g) transmitting and/or storing said compressed frame.
Claim 11
Independent Claim
133 words
A method for transmitting and/or storing image data, comprising the steps of: (a) generating first and second fields of data (X A , X B ) respectively representative of alternate lines of an image at first and second instants of time; (b) filtering said first (X A ) and second (X B ) fields to produce a filtered field (X B ') with increased correlation to said first field; (c) generating a motion parameter (α) indicative of whether there is motion in said image; (d) generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; (e) combining said first field with said weighted sum of said second and filtered fields to form a frame; (f) compressing said frame; and (g) transmitting and/or storing said compressed frame.
Claim 12
Dependent Claim
19 words
The method recited in claim 9, wherein said filtering step comprises vertically interpolating adjacent lines of said first field.
Claim 13
Dependent Claim
22 words
The method recited in claim 9, wherein said filtering step comprises vertically and horizontally combining pixels of said first and second fields.
Claim 14
Dependent Claim
48 words
The method recited in claim 9, wherein said step of generating a motion parameter α comprises summing over a prescribed area the difference in value between corresponding pixels in said first field and a third field (X C ) representing the image at a later instant in time.
Claim 15
Dependent Claim
51 words
The method recited in claim 9, wherein said motion parameter α is restricted to values between 0 and 1 and said step of generating a weighted sum of said second and filtered fields comprises weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
Claim 16
Dependent Claim
29 words
The method recited in claim 9, wherein said filtering step comprises computing a weighted sum of adjacent lines of said first field and a line of said second field.
Claim 17
Dependent Claim
35 words
The method recited in claim 14, wherein said filtering step comprises applying approximately an 8 to 1 ratio of weights to said line of said second field and said adjacent lines of said first field.
Claim 18
Dependent Claim
96 words
The method recited in claim 10, 11 or 14, wherein: said step of generating a motion parameter α comprises summing over a prescribed area the difference in value between corresponding pixels in said first field and a third field (X C ) representing the image at a later instant in time; and said motion parameter α is restricted to values between 0 and 1 and said step of generating a weighted sum of said second and filtered fields comprises weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
Claim 19
Dependent Claim
103 words
A motion filter for increasing the correlation between pixels of an image, comprising: (a) means for filtering first (X A ) and second (X B ) fields of pixels to produce a filtered field (X B ') with increased correlation to said first field; (b) means for generating a motion parameter (α) indicative of whether there is motion in said image; (c) means for generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; and (d) means for combining said first field with said weighted sum of said second and filtered fields to form a frame.
Claim 20
Dependent Claim
103 words
A motion filter for increasing the correlation between pixels of an image, comprising: (a) means for filtering first (X A ) and second (X B ) fields of pixels to produce a filtered field (X B ') with increased correlation to said first field; (b) means for generating a motion parameter (α) indicative of whether there is motion in said image; (c) means for generating, as a function of said motion parameter, a weighted sum of said second and filtered fields; and (d) means for combining said first field with said weighted sum of said second and filtered fields to form a frame.
Claim 21
Dependent Claim
22 words
The motion filter in claim 17, wherein said means for filtering comprises means for vertically interpolating adjacent lines of said first field.
Claim 22
Dependent Claim
25 words
The motion filter in claim 17, wherein said means for filtering comprises means for vertically and horizontally combining pixels of said first and second fields.
Claim 23
Dependent Claim
51 words
The motion filter in claim 17, wherein said means for generating a motion parameter α comprises means for summing over a prescribed area the absolute difference in value between corresponding pixels in said first field and a third field (X C ) representing the image at a later instant in time.
Claim 24
Dependent Claim
60 words
The motion filter in claim 17, wherein said means for generating a motion parameter α comprises means for restricting α to values between 0 and 1 and said means for generating a weighted sum of said second and filtered fields comprises means for weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
Claim 25
Dependent Claim
34 words
The motion filter in claim 17, wherein said means for filtering comprises means for computing a weighted sum of adjacent lines of said first field and one or more lines of said second field.
Claim 26
Dependent Claim
38 words
The motion filter in claim 22, wherein said means for filtering comprises means for applying approximately and 8 to 1 ratio of weights to said line of said second field and said adjacent lines of said first field.
Claim 27
Dependent Claim
107 words
The motion filter in claim 18, 19 or 22, wherein: said means for generating a motion parameter α comprises means for summing over a prescribed area the absolute difference in value between corresponding pixels in said first field and a third field (X C ) representing the image a later instant in time; and said means for generating a motion parameter α comprises means for restricting α to values between 0 and 1 and said means for generating a weighted sum of said second and filtered fields comprises means for weighting said second field in proportion to 1-α and weighting said filtered field in proportion to α.
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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |