CN1072023A - Auto-iris system for televison cameras - Google Patents
Auto-iris system for televison cameras Download PDFInfo
- Publication number
- CN1072023A CN1072023A CN92110348.4A CN92110348A CN1072023A CN 1072023 A CN1072023 A CN 1072023A CN 92110348 A CN92110348 A CN 92110348A CN 1072023 A CN1072023 A CN 1072023A
- Authority
- CN
- China
- Prior art keywords
- activity
- auto iris
- auto
- response time
- scenery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Control For Cameras (AREA)
- Studio Devices (AREA)
Abstract
Video camera (2) is equipped with an activity detector (6), and control circuit (8) utilizes the output of detecting device (6), changes the response time of the auto iris of video camera (2) according to the activity of scenery in the scene of video camera (2) aligning.
Description
The present invention relates to be used to control the auto-iris system for televison cameras of the exposure of shooting picture.
At present the auto-iris system for televison cameras that uses has an aperture control signal, and it is to mix by the non-stack with R, G, B video component to give independent peak value and the average value signal detecting device forms.The output of these detecting devices is mixed before the low-pass filtering carrying out on request, thereby produces final aperture control signal.Manual control signal exposes to video pictures and owes the exposure compensation, and it also can mix with these signals.In order to ensure middle section decision exposing quantity, when producing the aperture control signal, do not consider the edge of picture according to picture.The response speed of system depends on low-pass filtering, if system performance is well talked about, this response speed just must be very fast.
Image content changes the influence that system is produced and has limited fastest response speed.For example, when a people who wears light shirt steps into the suitable district of finding a view of first prior exposure, the auto iris control system will reduce exposure to a certain extent, if the response speed of system is too fast, shooting person just will see that flash, unnecessary scenery brightness changes so.
This influence makes the typical response speed set in the auto iris system slower than desirable.If the video camera that this system is housed continues dark scene from a bright scene change to another soon, just can see that aperture opens greatly automatically.Change under the very fast situation at image content, some are suitable to response speed soon.
Under the situation that the brightness of the literal on a face or the blank sheet of paper changes, it is unfavorable that present long response time especially seems, because brightness at this moment has the activity of shadow thing to cover the long influence that causes of response time in changing.
The present invention will change the response time of auto iris system according to the activity of scenery.
Describe the present invention with reference to the accompanying drawings in detail, accompanying drawing is represented the block diagram of one embodiment of the present of invention.
Among the figure, video camera 2 is seen scenery by camera lens 4, comprises an aperture control system that responds according to the aperture control signal in the camera lens 4.Video camera produces a video output signals, and it can be stored, so that use in the future.
Activity detector 6 receives above-mentioned video output signals, and in a known way the adjacent frame of vision signal is compared, and detects activity thus.Activity detector is preferably in the selected picture area and seeks scene change, so just the active situation control aperture in the main region of the scene that can take according to video camera.
The output of activity detector is a picture active signal (PMS), and it is sent to aperture control circuit 8.The aperture control circuit produces control signal, according to the auto iris in the activity controls lens 4.The aperture control system in the camera lens 4 and the response time of aperture control circuit 8 are functions of PMS, and its simplest form is the response time to be proportional to PMS.
System arranges like this, and promptly when the activity of picture hour, the response time of auto iris system is short.When surpassing a specific threshold value, can reduce the response time of system, guarantee thus changing under the very fast situation between the consecutive frame, the influence of covering that activity is big in the above-mentioned scene is worked, and makes the aperture response speed not obvious slowly.
In fact the scene brightness variation can cause such effect, and promptly at activity detector, the scenery in the scene seems that in activity, for example the sun moves the situation that forms shade.System of the present invention will regard it as the activity of shadow thing, and therefore make the auto iris system correspondingly control aperture settings.
Claims (6)
1, a kind of video camera auto iris system is characterized in that comprising the device (6) that detects the scenery activity between the video signal frame, and the device (8) that changes the response time of auto iris control system according to scenery activity in the scene.
2, according to a kind of auto iris system of claim 1, wherein the activity hour response time is the shortest.
3, according to a kind of auto iris system of claim 1 or 2, wherein activity detection apparatus (6) produces picture active signal (PMS) from least one selected scene areas.
4, according to a kind of auto iris system of claim 3, wherein PMS is that middle section from scene obtains basically.
5, according to a kind of auto iris system of right 1,2,3 or 4, wherein when the activity of scenery in the picture surpassed a predetermined value, the response time of control system (8) reduced.
6, according to a kind of auto iris system of claim 1 to 4, wherein the response time of auto iris system is proportional to the activity of scenery in the scene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9119254.2 | 1991-09-09 | ||
| GB9119254A GB2259423A (en) | 1991-09-09 | 1991-09-09 | Automatic control of television camera iris |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1072023A true CN1072023A (en) | 1993-05-12 |
Family
ID=10701140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92110348.4A Pending CN1072023A (en) | 1991-09-09 | 1992-09-08 | Auto-iris system for televison cameras |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1072023A (en) |
| AU (1) | AU2541992A (en) |
| GB (1) | GB2259423A (en) |
| WO (1) | WO1993005615A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3113259B2 (en) * | 1989-07-18 | 2000-11-27 | 富士写真フイルム株式会社 | Exposure control method and apparatus for video camera |
| US5030984A (en) * | 1990-07-19 | 1991-07-09 | Eastman Kodak Company | Method and associated apparatus for minimizing the effects of motion in the recording of an image |
| FR2665318B1 (en) * | 1990-07-27 | 1996-01-26 | Thomson Csf | OPTICAL MITIGATION METHOD FOR CAMERA, ATTENUATION SYSTEM FOR IMPLEMENTATION AND CAMERA EQUIPPED WITH SUCH A SYSTEM. |
| JP3214828B2 (en) * | 1997-09-08 | 2001-10-02 | 前田製管株式会社 | Concrete pipe and its connection structure |
-
1991
- 1991-09-09 GB GB9119254A patent/GB2259423A/en not_active Withdrawn
-
1992
- 1992-08-28 AU AU25419/92A patent/AU2541992A/en not_active Abandoned
- 1992-08-28 WO PCT/GB1992/001589 patent/WO1993005615A1/en active Application Filing
- 1992-09-08 CN CN92110348.4A patent/CN1072023A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB9119254D0 (en) | 1991-10-23 |
| AU2541992A (en) | 1993-04-05 |
| GB2259423A (en) | 1993-03-10 |
| WO1993005615A1 (en) | 1993-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |