US4992877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image pickup apparatus with supervision of noise level differences between fields
Assignee: Canon Inc
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Filing: 1989-03-13
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Granted: 1991-02-12
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Expires: 2009-03-13
Abstract
Abstract There is provided an image pickup apparatus having an image pickup element for dividing a photoelectrically converted video signal of one frame into first and second fields and for sequentially reading the fields out, wherein the apparatus has a suppression circuit to suppress the signal of a predetermined band in the video signal from the image pickup element by different magnitudes for the first and second fields.
Inventors
- 👤 Tsutomu Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:06
CPC Classifications
H; H04; H04N; H04N25/00; H04N25/60; H04N25/63; Y; Y10; Y10S; Y10S348/00; Y10S348/91
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
79 words
An image pickup apparatus comprising: (a) an image pickup element for dividing a photoelectrically converted video signal of one frame into first and second fields and sequentially reading out the first and second fields; (b) suppressing means for suppressing the signal of a predetermined band in the video signal from said image pickup element; and (c) control means for controlling said suppressing means so as to change characteristics of suppression with respect to the first and second fields, respectively.
Claim 2
Dependent Claim
79 words
An image pickup apparatus comprising: (a) an image pickup element for dividing a photoelectrically converted video signal of one frame into first and second fields and sequentially reading out the first and second fields; (b) suppressing means for suppressing the signal of a predetermined band in the video signal from said image pickup element; and (c) control means for controlling said suppressing means so as to change characteristics of suppression with respect to the first and second fields, respectively.
Claim 3
Dependent Claim
30 words
An apparatus according to claim 1, wherein said suppressing means is a circuit to suppress a low signal level in the signal of the predetermined band in the video signal.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1, wherein said predetermined band is a high frequency band.
Claim 5
Dependent Claim
13 words
An apparatus according to claim 1, wherein said suppressing means includes clip means.
Claim 6
Dependent Claim
16 words
An apparatus according to claim 1, wherein said image pickup element includes an interline type CCD.
Claim 7
Dependent Claim
32 words
An image pickup apparatus according to claim 1, wherein said suppressing means includes outline emphasizing means for generating an outline correction signal in order to emphasize an outline of the video signal.
Claim 8
Dependent Claim
30 words
An apparatus according to claim 6, wherein the signal of the predetermined band in the video signal is said outline correction signal to emphasize an outline of the video signal.
Claim 9
Dependent Claim
28 words
An image pickup apparatus according to claim 1, wherein said control means suppresses a signal of the second field more strongly than a signal of the first field.
Claim 10
Dependent Claim
82 words
An image pickup apparatus comprising: (a) an image pickup element for dividing a photoelectrically converted video signal of one frame into first and second fields and sequentially reading out for only a preset same time; (b) exposing means for allowing an optical image to enter said image pickup element for only a photoelectric converting period of time; and (c) suppressing means for suppressing the video signal from the image pickup element by magnitudes which are different for the first and second fields.
Claim 11
Dependent Claim
82 words
An image pickup apparatus comprising: (a) an image pickup element for dividing a photoelectrically converted video signal of one frame into first and second fields and sequentially reading out for only a preset same time; (b) exposing means for allowing an optical image to enter said image pickup element for only a photoelectric converting period of time; and (c) suppressing means for suppressing the video signal from the image pickup element by magnitudes which are different for the first and second fields.
Claim 12
Dependent Claim
31 words
An apparatus according to claim 9, wherein said suppressing means suppresses on outline emphasis signal of the video signal by the magnitudes which are different for the first and second fields.
Claim 13
Dependent Claim
35 words
An apparatus according to claim 9, wherein said suppressing means clips a low amplitude portion of a high band component in the video signal by amplitudes which are different for the first and second fields.
Claim 14
Dependent Claim
16 words
An apparatus according to claim 9, wherein said image pickup element includes an interline type CCD.
Claim 15
Dependent Claim
32 words
An image pickup apparatus according to claim 9, wherein said suppressing means includes outline emphasizing means for generating an outline correction signal in order to emphasize an outline of said video signal.
Claim 16
Dependent Claim
28 words
An image pickup apparatus according to claim 9, wherein said control means suppresses a signal of the second field more strongly than a signal of the first field.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |