US5345264A
Expired / Lapsed
US
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Video signal processing circuit for a video camera using a luminance signal
Assignee: Sanyo Electric Co Ltd
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Filing: 1993-02-24
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Granted: 1994-09-06
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Expires: 2013-02-24
Abstract
Abstract Auto focus control and/or auto exposure control is carried out by using a luminance signal before gamma correction, before addition of aperture signal but after hand shake correction. Auto white balance control is carried out by using a color signal after hand shake correction. Consequently, precise auto focus control, auto exposure control and/or auto white balance control can be done. The field memory for electronic zooming and/or hand shake correction is also used as a field memory for noise reduction. Consequently, a video signal processing circuit which is inexpensive and simple can be implemented.
Inventors
- 👤 Haruhiko Murata
- 👤 Yukio Mori
- 👤 Akihiro Maenaka
- 👤 Masao Takuma
- 👤 Kiyotada Kawakami
- 👤 Toru Asaeda
- 👤 Toshiyuki Okino
- 👤 Toshiya Iinuma
- 👤 Akio Kobayashi
- 👤 Toshinobu Haruki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:43
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/60; H04N23/67; H04N23/673; H04N23/68; H04N23/681; H04N23/6811; H04N23/682; H04N23/683; H04N23/70; H04N23/72; H04N25/00; H04N25/60; H04N25/70; H04N25/71; H04N25/75
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A video signal processing circuit for a video camera, comprising: Y/C separating means for separating a video signal obtained by AD conversion of an output from an image pickup device to a luminance signal and a color signal for outputting; and auto focus accumulating means for accumulating, at a prescribed period, high frequency component of the luminance signal outputted from said Y/C separating means before gamma correction, for outputting the result as an auto focus reference signal for automatic focus adjustment.
Claim 2
Dependent Claim
81 words
A video signal processing circuit for a video camera, comprising: Y/C separating means for separating a video signal obtained by AD conversion of an output from an image pickup device to a luminance signal and a color signal for outputting; and auto focus accumulating means for accumulating, at a prescribed period, high frequency component of the luminance signal outputted from said Y/C separating means before gamma correction, for outputting the result as an auto focus reference signal for automatic focus adjustment.
Claim 3
Dependent Claim
36 words
The video signal processing circuit for a video camera according to claim 1, wherein the luminance signal to be accumulated by said auto focus accumulating means is the luminance signal before addition of an aperture signal.
Claim 4
Dependent Claim
31 words
The video signal processing circuit for a video camera according to claim 1, wherein the video signal processing circuit including said auto focus accumulating means is formed by one IC chip.
Claim 5
Dependent Claim
81 words
A video signal processing circuit for a video camera, comprising: Y/C separating means for separating a video signal obtained by AD conversion of an output from an image pickup device to a luminance signal and a color signal for outputting; and auto exposure accumulating means for accumulating, at a prescribed period, low frequency component of the luminance signal outputted from said Y/C separating means before gamma correction, for outputting the result as an auto exposure reference signal for automatic exposure adjustment.
Claim 6
Dependent Claim
81 words
A video signal processing circuit for a video camera, comprising: Y/C separating means for separating a video signal obtained by AD conversion of an output from an image pickup device to a luminance signal and a color signal for outputting; and auto exposure accumulating means for accumulating, at a prescribed period, low frequency component of the luminance signal outputted from said Y/C separating means before gamma correction, for outputting the result as an auto exposure reference signal for automatic exposure adjustment.
Claim 7
Dependent Claim
36 words
The video signal processing circuit for a video camera according to claim 4, wherein the luminance signal to be accumulated by said auto exposure accumulating means is the luminance signal before addition of an aperture signal.
Claim 8
Dependent Claim
31 words
The video signal processing circuit for a video camera according to claim 4, wherein the video signal processing circuit comprising said auto exposure accumulating means is formed by one IC chip.
Claim 9
Dependent Claim
103 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto focus accumulating means for accumulating, at a prescribed period, high frequency component of the luminance signal output from said Y/C separating means for outputting the result as an auto focus reference signal for automatic focus adjustment.
Claim 10
Dependent Claim
103 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto focus accumulating means for accumulating, at a prescribed period, high frequency component of the luminance signal output from said Y/C separating means for outputting the result as an auto focus reference signal for automatic focus adjustment.
Claim 11
Dependent Claim
103 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto exposure accumulating means for accumulating, at a prescribed period, low frequency component of the luminance signal output from said Y/C separating means for outputting the result as an auto exposure reference signal for automatic exposure adjustment.
Claim 12
Dependent Claim
103 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto exposure accumulating means for accumulating, at a prescribed period, low frequency component of the luminance signal output from said Y/C separating means for outputting the result as an auto exposure reference signal for automatic exposure adjustment.
Claim 13
Dependent Claim
101 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto white balance accumulating means for accumulating, at a prescribed period, the color signal output from said Y/C separating means for outputting the result as an auto white balance reference signal for automatic tone adjustment.
Claim 14
Dependent Claim
101 words
A video signal processing circuit for a video camera, comprising: hand shake correcting means for correcting hand shake of a video signal obtained by AD conversion of an output from an image pickup device for outputting; Y/C separating means for separating the video signal after hand shake correction output from said hand shake correcting means to a luminance signal and a color signal for outputting; and auto white balance accumulating means for accumulating, at a prescribed period, the color signal output from said Y/C separating means for outputting the result as an auto white balance reference signal for automatic tone adjustment.
References Cited (Backward Citations)
US5065247A
Cited
US5003339A
Cited
US4959728A
Cited
US5161026A
Cited
US5093716A
Cited
JPH03297282A
Cited
US5218444A
Cited
EP0501723A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-05 | 1998-03-07 | 1998-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-05 | 2002-03-07 | 2002-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-05 | 2006-03-07 | 2006-09-06 | $7700.00 | Window Closed / Lapsed |