US5877810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video camera, printer apparatus and method of controlling same, and apparatus and method for detecting print inhibit signal
Assignee: Fujifilm Corp
•
Filing: 1996-12-30
•
Granted: 1999-03-02
•
Expires: 2016-12-30
Abstract
Abstract The levels of video signals obtained by photography at a relatively high shutter speed and photography at an ordinary shutter speed are made approximately equal at all times, irrespective of any change in the characteristics of an AGC. Photography performed at a relatively high shutter speed of one time in a plurality of fields and photography is performed at an ordinary speed at other times is repeated periodically. One field of a luminance signal obtained by photography at the relatively high shutter speed is integrated by a first integrating circuit, and one field of the luminance signal obtained by photography at the ordinary shutter speed is integrated by a second integrating circuit, wherein the luminance signals represent contiguous images. A signal representing the difference between these integrated values is produced by a difference detecting circuit. The difference signal serves as a gain correction signal. The gain correction signal is added to a gain control signal, and the resulting signal is applied to the AGC. The gain control signal of the AGC is corrected by the gain correction signal so that the average level of the video signal resulting from photography at the relatively high shutter speed and the average level of the video signal resulting from photography at the ordinary shutter speed become approximately equal in the AGC.
Inventors
- 👤 Masafumi Inuiya
- 👤 Takeshi Misawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:53
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00281; H04N1/00283; H04N1/00291; H04N1/00095; H04N1/00098; H04N1/00294; H04N1/00912; H04N1/00925; H04N1/21; H04N1/2104; H04N1/2112; H04N1/212; H04N1/23; H04N1/2307; H04N1/2376; H04N1/40; H04N23/00; H04N23/70; H04N23/72; H04N23/73; H04N23/745; H04N23/76; H04N25/00; H04N5/00; H04N5/76; H04N5/765; H04N5/77; H04N5/772; H04N2101/00; H04N2201/00; H04N2201/0077; H04N2201/0082; H04N2201/0084; H04N2201/0087; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3242; H04N2201/3243; H04N2201/3285; H04N2201/3287
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
215 words
A video camera comprising: shutter implementing means for periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; photographic means for outputting a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; an amplifier circuit for amplifying the output first video signal at a first amplification factor and amplifying the second video at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; first integrating means for integrating one frame of the first video signal and outputting a first integrated value; second integrating means for integrating one frame of second video signal and outputting a second integrated value; subtracting means for producing a difference signal representing a difference between the first and second integrated values; and adjusting means for adjusting at least one of the first and second amplification factors of said amplifier circuit, based upon the difference signal obtained from said subtracting means, such that the difference is virtually eliminated.
Claim 2
Dependent Claim
215 words
A video camera comprising: shutter implementing means for periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; photographic means for outputting a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; an amplifier circuit for amplifying the output first video signal at a first amplification factor and amplifying the second video at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; first integrating means for integrating one frame of the first video signal and outputting a first integrated value; second integrating means for integrating one frame of second video signal and outputting a second integrated value; subtracting means for producing a difference signal representing a difference between the first and second integrated values; and adjusting means for adjusting at least one of the first and second amplification factors of said amplifier circuit, based upon the difference signal obtained from said subtracting means, such that the difference is virtually eliminated.
Claim 3
Dependent Claim
36 words
The video camera according to claim 1, wherein exposure at the relatively high shutter speed is performed one time in photography of a multiple of six successive frames of exposure performed at the ordinary shutter speed.
Claim 4
Dependent Claim
17 words
The video camera of claim 1, wherein the relatively high shutter speed is 1/120 of a second.
Claim 5
Dependent Claim
17 words
The video camera of claim 1, wherein the relatively high shutter speed is 1/250 of a second.
Claim 6
Independent Claim
186 words
A method of controlling a video camera, comprising the steps of: periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; obtaining a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; amplifying the output first video signal at a first amplification factor and amplifying the second video signal at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; integrating one frame of the first video signal to obtain a first integrated value; integrating one frame of the second video signal to obtain a second integrated value; calculating a difference between the first and second integrated values; and adjusting at least one of the first and second amplification factors based upon the calculated difference, such that the difference is virtually eliminated.
Claim 7
Independent Claim
186 words
A method of controlling a video camera, comprising the steps of: periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; obtaining a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; amplifying the output first video signal at a first amplification factor and amplifying the second video signal at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; integrating one frame of the first video signal to obtain a first integrated value; integrating one frame of the second video signal to obtain a second integrated value; calculating a difference between the first and second integrated values; and adjusting at least one of the first and second amplification factors based upon the calculated difference, such that the difference is virtually eliminated.
Claim 8
Dependent Claim
35 words
The method according to claim 5, wherein exposure at the relatively high shutter speed is performed one time in photography of a multiple of six successive frames of exposure performed at the ordinary shutter speed.
Claim 9
Dependent Claim
16 words
The method of claim 5, wherein the relatively high shutter speed is 1/120 of a second.
Claim 10
Dependent Claim
16 words
The method of claim 5, wherein the relatively high shutter speed is 1/250 of a second.
Claim 11
Dependent Claim
215 words
A video camera comprising: shutter implementing device for periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; photographic device for outputting a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; an amplifier circuit for amplifying the output first video signal at a first amplification factor and amplifying the second video at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; first integrating device for integrating one frame of the first video signal and outputting a first integrated value; second integrating device for integrating one frame of a second video signal and outputting a second integrated value; subtractor for producing a difference signal representing a difference between the first and second integrated values; and amplification gain controller for adjusting at least one of the first and second amplification factors of said amplifier circuit, based upon the difference signal obtained from said subtractor, such that the different is virtually eliminated.
Claim 12
Dependent Claim
215 words
A video camera comprising: shutter implementing device for periodically repeating exposure performed at a relatively high shutter speed one time in photography of a plurality of successive frames of exposure performed at an ordinary shutter speed, relatively lower than the relatively high shutter speed; photographic device for outputting a first video signal when exposure is performed at the ordinary shutter speed and a second video signal when exposure is performed at the relatively high shutter speed; an amplifier circuit for amplifying the output first video signal at a first amplification factor and amplifying the second video at a second amplification factor, different from the first amplification factor, such that a level of the first video signal is approximately equal to a level of the second video signal; first integrating device for integrating one frame of the first video signal and outputting a first integrated value; second integrating device for integrating one frame of a second video signal and outputting a second integrated value; subtractor for producing a difference signal representing a difference between the first and second integrated values; and amplification gain controller for adjusting at least one of the first and second amplification factors of said amplifier circuit, based upon the difference signal obtained from said subtractor, such that the different is virtually eliminated.
Claim 13
Dependent Claim
36 words
The video camera according to claim 9, wherein exposure at the relatively high shutter speed is performed one time in photography of a multiple of six successive frames of exposure performed at the ordinary shutter speed.
Claim 14
Dependent Claim
17 words
The video camera of claim 9, wherein the relatively high shutter speed is 1/120 of a second.
Claim 15
Dependent Claim
17 words
The video camera of claim 9, wherein the relatively high shutter speed is 1/250 of a second.
References Cited (Backward Citations)
US4881127A
Cited
US5331949A
Cited
US5153729A
Cited
US4984002A
Cited
US5157502A
Cited
US5140420A
Cited
US5173779A
Cited
US5258848A
Cited
US5311311A
Cited
JPH04318769A
Cited
US5559552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |