US5717469A
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US
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Video frame grabber comprising analog video signals analysis system
Assignee: Agfa HealthCare NV
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Filing: 1994-06-30
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Granted: 1998-02-10
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Expires: 2014-06-30
Abstract
Abstract In a video frame grabber for digitizing analog video signals which have a pure analog video signal component and a synchronisation signal component, the synchronisation signals are digitized along with the pure analog video signals. Video gain and offset, sync gain, and sync threshold can be adjusted electronically. A variable time delay can be imposed on the sampling clock signals and on horizontal reference signals. Optimal values can be determined for the various parameters.
Inventors
- 👤 Jos Jennes
- 👤 Paul Wouters
- 👤 Paul Canters
- 👤 Herman Van Goubergen
- 👤 Geert Debeerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:08
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00281; H04N1/00283; H04N1/00291; H04N1/32; H04N1/32358; H04N5/00; H04N5/04; H04N5/06; H04N5/12; H04N5/126; H04N5/14; H04N5/20; H04N5/44; H04N5/4448; H04N2201/00; H04N2201/0077; H04N2201/0082; H04N2201/0084; H04N5/76; H04N5/907
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
92 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; a digital memory means for storage of said digital image signals or said digital synchronization signals; and a memory selection means for selectively storing in said digital memory means either: said digital image signals or said digital synchronization signals.
Claim 2
Dependent Claim
92 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; a digital memory means for storage of said digital image signals or said digital synchronization signals; and a memory selection means for selectively storing in said digital memory means either: said digital image signals or said digital synchronization signals.
Claim 3
Dependent Claim
27 words
The system according to claim 1, wherein said analog video digitizer means and said sync signals digitizer means are incorporated in one analog to digital converter means.
Claim 4
Dependent Claim
18 words
The system according to claim 1, further comprising means to extract said synchronization signals from said video signals.
Claim 5
Dependent Claim
99 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; wherein said video signals further comprise other pure analog video signals different from said pure analog video signals and forming composite video signals together with said synchronization signals, and wherein said system further comprises means to extract said synchronization signals from said composite video signals.
Claim 6
Dependent Claim
99 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; wherein said video signals further comprise other pure analog video signals different from said pure analog video signals and forming composite video signals together with said synchronization signals, and wherein said system further comprises means to extract said synchronization signals from said composite video signals.
Claim 7
Dependent Claim
31 words
The system according to claim 1, wherein said synchronization signals are composite synchronization signals, and wherein said system further comprises means to extract synchronization component signals from said composite synchronization signals.
Claim 8
Dependent Claim
19 words
The system according to claim 5, wherein said synchronization component signals are horizontal synchronization signals and vertical synchronization signals.
Claim 9
Dependent Claim
22 words
The system according to claim 1, further comprising a sampling clock generator, generating sampling clock signals for said analog video digitizer means.
Claim 10
Dependent Claim
67 words
A video frame grabber system for obtaining digital image signal from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signal into said digital image signals; a sampling clock generator, generating sampling clock signals for said analog video digitizer means; and a base clock means, generating base clock signals for said sampling clock generator.
Claim 11
Dependent Claim
67 words
A video frame grabber system for obtaining digital image signal from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signal into said digital image signals; a sampling clock generator, generating sampling clock signals for said analog video digitizer means; and a base clock means, generating base clock signals for said sampling clock generator.
Claim 12
Independent Claim
46 words
The system according to claims 8, wherein said base clock means comprises a fixed base clock means and a base clock selection means to select said base clock signals for said sampling clock generator extracted either from: said synchronization signals or said fixed base clock means.
Claim 13
Dependent Claim
52 words
The system according to claim 8, wherein: said sampling clock signal have a sampling clock signals frequency; said base clock signals have a base clock signals frequency; and said sampling clock generator comprises a sample counter means for adjusting the sampling clock signals frequency with respect to the base clock signals frequency.
Claim 14
Dependent Claim
22 words
The system according to claim 1, further comprising a sampling clock generator, generating sampling clock signals for said sync signals digitizer means.
Claim 15
Dependent Claim
82 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; a sampling clock generation, generating sampling clock signals for said sync signals digitizer means; and a fixed base clock means, generating base clock signals for said sampling clock generator.
Claim 16
Dependent Claim
82 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals; a sampling clock generation, generating sampling clock signals for said sync signals digitizer means; and a fixed base clock means, generating base clock signals for said sampling clock generator.
Claim 17
Dependent Claim
36 words
The system according to claim 12, further comprising a base clock selection means to select said base clock signals for said sampling clock generator extracted either from: said synchronization signals or said fixed base clock means.
Claim 18
Dependent Claim
52 words
The system according to claim 12, wherein: said signals clock signals have a sampling clock signals frequency; said base clock signals have a base clock sign frequency; and said sampling clock generator comprises a sample counter means for adjusting the sampling clock signals frequency with respect to the base clock signals frequency.
Claim 19
Dependent Claim
69 words
A video frame grabber system for obtaining digital image signal from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means digitizing said pure video signals into said digital image signals; sync gain means for amplification or reduction of the amplitude of said synchronization signals; and a sync signals digitizer means for digitizing said amplified or amplitude-reduced synchronization signals into digital synchronizaton signals.
Claim 20
Dependent Claim
69 words
A video frame grabber system for obtaining digital image signal from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means digitizing said pure video signals into said digital image signals; sync gain means for amplification or reduction of the amplitude of said synchronization signals; and a sync signals digitizer means for digitizing said amplified or amplitude-reduced synchronization signals into digital synchronizaton signals.
Claim 21
Dependent Claim
19 words
The system according to claim 15, wherein the amplification or reduction factor of said sync gain means is variable.
Claim 22
Dependent Claim
16 words
The system according to claim 16, wherein said amplification and reduction factor can be set electronically.
Claim 23
Dependent Claim
73 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signal and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals and said digital image signals; sync threshold means for discrimination between high level and low level synchronization signals by a sync threshold level; and a sync signals digitizer means for digitizing said threshold-discriminated synchronization signals into digital synchronization signals.
Claim 24
Dependent Claim
73 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signal and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals and said digital image signals; sync threshold means for discrimination between high level and low level synchronization signals by a sync threshold level; and a sync signals digitizer means for digitizing said threshold-discriminated synchronization signals into digital synchronization signals.
Claim 25
Dependent Claim
13 words
The system according to claim 18, wherein said sync threshold level is variable.
Claim 26
Dependent Claim
15 words
The system according to claim 19, wherein said sync threshold level can be set electronically.
Claim 27
Dependent Claim
80 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signal into said digital image signals; a video window delineation means operative on said analog video digitizer means for limiting the digitization of said pure analog video signals to a rectangular window; and a sync signals digitizer means for digitizing said synchronizaton signals into digital synchronization signals.
Claim 28
Dependent Claim
80 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signal into said digital image signals; a video window delineation means operative on said analog video digitizer means for limiting the digitization of said pure analog video signals to a rectangular window; and a sync signals digitizer means for digitizing said synchronizaton signals into digital synchronization signals.
Claim 29
Dependent Claim
16 words
The system according to claim 21, wherein the position and size of said window is variable.
Claim 30
Dependent Claim
15 words
The system according to claim 22, wherein said position and size can be set electronically.
Claim 31
Dependent Claim
28 words
The system according to claim 21, further comprising a synchronisation delay means, coupled to said window delineation means, for delaying said synchronisation signals by a predetermined time delay.
Claim 32
Dependent Claim
12 words
The system according to claim 24, wherein said time delay is variable.
Claim 33
Dependent Claim
14 words
The system according to claim 25, wherein said time delay can be set electronically.
Claim 34
Dependent Claim
21 words
The system according to claim 8, further comprising delay means for delaying said base clock signals by a predetermined time delay.
Claim 35
Independent Claim
13 words
The system according to claim to 27, wherein said time delay is variable.
Claim 36
Dependent Claim
14 words
The system according to claim 28, wherein said time delay can be set electronically.
Claim 37
Dependent Claim
65 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; an analog signal filter means for filtering said synchronization signals; said a sync signals digitizer means for digitizing said filtered synchronization signals into digital synchronization signals.
Claim 38
Dependent Claim
65 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for digitizing said pure analog video signals into said digital image signals; an analog signal filter means for filtering said synchronization signals; said a sync signals digitizer means for digitizing said filtered synchronization signals into digital synchronization signals.
Claim 39
Dependent Claim
18 words
The system according to claim 30, wherein said analog signal filter means is an electronic low pass filter.
Claim 40
Dependent Claim
20 words
The system according to claim 31, wherein the cut-off frequency of said analog signal filter means can be set electronically.
Claim 41
Dependent Claim
66 words
A video frame grabber systems for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for filtering said video signals; an analog signal digitizer means for digitizing said filtered pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said filtered synchronization signals into digital synchronization signals.
Claim 42
Dependent Claim
66 words
A video frame grabber systems for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: an analog video digitizer means for filtering said video signals; an analog signal digitizer means for digitizing said filtered pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said filtered synchronization signals into digital synchronization signals.
Claim 43
Dependent Claim
18 words
The system according to claim 33, wherein said analog signal filter means is an electronic low pass filter.
Claim 44
Dependent Claim
20 words
The system according to claim 34, wherein the cut-off frequency of said analog signal filter means can be set electronically.
Claim 45
Dependent Claim
22 words
The system according to claim 1, further comprising video gain means for amplification or reduction of the amplitude of said video signals.
Claim 46
Dependent Claim
18 words
The according to claim 36, wherein the amplification or reduction factor of said video gain means is variable.
Claim 47
Dependent Claim
16 words
The system according to claim 37, wherein said amplification and reduction factor can be set electronically.
Claim 48
Dependent Claim
72 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: video offset means for adding or subtracting a predetermined offset level to said pure analog video signals; an analog video digitizer means for digitizing said offset pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals.
Claim 49
Dependent Claim
72 words
A video frame grabber system for obtaining digital image signals from video signals comprising pure analog video signals and synchronization signals, comprising: video offset means for adding or subtracting a predetermined offset level to said pure analog video signals; an analog video digitizer means for digitizing said offset pure analog video signals into said digital image signals; and a sync signals digitizer means for digitizing said synchronization signals into digital synchronization signals.
Claim 50
Dependent Claim
12 words
The system according to claim 39, wherein said offset level is variable.
Claim 51
Dependent Claim
14 words
The system according to claim 40, wherein said offset level can be set electronically.
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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) | 2001-02-09 | 2001-08-11 | 2002-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-09 | 2005-08-11 | 2006-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-09 | 2009-08-11 | 2010-02-10 | $7700.00 | Window Closed / Lapsed |