CN1177121A - Iris control apparatus for video camera - Google Patents
Iris control apparatus for video camera Download PDFInfo
- Publication number
- CN1177121A CN1177121A CN97112910A CN97112910A CN1177121A CN 1177121 A CN1177121 A CN 1177121A CN 97112910 A CN97112910 A CN 97112910A CN 97112910 A CN97112910 A CN 97112910A CN 1177121 A CN1177121 A CN 1177121A
- Authority
- CN
- China
- Prior art keywords
- aperture
- value
- hall
- control apparatus
- current
- 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.)
- Granted
Links
- 238000003384 imaging method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/02—Diaphragms
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Control For Cameras (AREA)
- Studio Devices (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
An aperture control apparatus for video camera can quickly control the opening of the aperture to make the user screen an object with defined brightness. The apparatus includes: an aperture for outputting the Hall value for the current opening of the aperture, a luminosity value generator, a memory for storing a reference luminosity value and an aperture controller for storing the data relative to the curve representing the relation between the Hall value and the luminosity value and controlling the opening of the aperture. Another aperture control apparatus of the video camera can receive the f value from user to control the opening of the aperture, and can control the aperture by software program thereby realize that the shutter speed and the gain control are not relative with the aperture.
Description
The present invention relates to be used for the iris control apparatus of video camera, particularly can quick control aperture aperture and be fixed in a kind of iris control apparatus on the needed value of user.
The aperture that general video camera is controlled its aperture makes that the brightness of the subject image of taking the photograph is constant.Fig. 1 shows a kind of iris control apparatus that is used for general video camera, and an electric erasable and programmable ROM (EEPOM) 11 stores a Benchmark brightness value that is set to optimal brightness.One controller 12 is read the Benchmark brightness value that is stored among the EEPROM11 and this Benchmark brightness value of reading is supplied with an electronic variable resistor device (EVR) 13, and this EVR13 exports a voltage according to the Benchmark brightness value that slave controller 12 provides.One luminosity (luminance) detecting device 14 utilizes the signal of opto-electronic conversion to detect current brightness value by the light of aperture (not shown), and exports a voltage according to the current brightness value that is detected.One comparer 15 will be compared with the voltage level of exporting from photometric detector 14 from the voltage level of EVR13 output.In addition, equal to control the opening of aperture from the mode of the voltage of EVR13 output with voltage from photometric detector 14 output.That is to say,, make current brightness equal Benchmark brightness according to comparative result.
Iris control apparatus among Fig. 1 was the aperture that can not control this aperture before detecting current brightness value from photometric detector 14.And, under for the very low situation of the sample rate of the current brightness value that is detected, when can not changing in the brightness of object, the iris control apparatus among Fig. 1 controls aperture rapidly.
Simultaneously, video camera is also controlled the gain of aperture, shutter speed and pickoff signals automatically, so that the brightness of control subject image.Because it is identical with Benchmark brightness that the brightness of subject image generally is controlled to be, so shutter speed and gain control depend on aperture.In addition, general video camera does not have the sort of of still camera to change the function of controlling captured object brightness according to shutter speed under fixing f value.Thereby the user can not come object is made a video recording with required brightness.
An object of the present invention is provides a kind of iris control apparatus that is used for video camera for addressing the above problem, and it can control the aperture of aperture rapidly in case object brightness changes.
Another object of the present invention provides a kind of iris control apparatus that is used for video camera, and it can come object is made a video recording by the specified brightness of user.
For realizing above-mentioned purpose of the present invention, a kind of iris control apparatus that is used for video camera is provided, it comprises: the aperture that is used to export Hall (Hall) value of the current aperture that shows aperture; Be used to adopt the device that produces current shading value through the incident light of aperture; The storer of stored reference shading value; And control device, it be used for storing about the data that show the curve that concerns between Hall and the shading value and be used for so that current Hall value equal corresponding to the mode of the Hall value of the benchmark shading value that has storer also the curve that determined by current shading value and current Hall value of employing control the opening of aperture.
For realizing other purpose of the present invention, an iris control apparatus that is used for video camera also is provided, it comprises: an aperture; One is used for receiving from the user key input section of f value; And control device, being used for aperture according to Hall value control aperture, this Hall value is corresponding to the f value from the key input section input.
With reference to accompanying drawing preferred embodiment will be described, wherein:
Fig. 1 is the block scheme of the iris control apparatus of the general video camera of expression;
Fig. 2 is the block scheme of expression according to the iris control apparatus of video camera of the present invention;
Fig. 3 is the figure that explains the relation between Hall value and the shading value; And
Fig. 4 is the figure that calculates the computing method of aperture controlling value in the controller of explaining in Fig. 2.
With reference to accompanying drawing 2 to Fig. 4 the preferred embodiments of the present invention will be described.
In Fig. 2, a solid imaging element 22 will convert the result that an electric signal and output are changed through the light of aperture 21 inputs to.One charge-coupled device (CCD) is used as solid imaging element 22.One modulus (A/D) converter 23 will become a digital signal from the analog signal conversion of these solid imaging element 22 outputs.One digital signal processor (DSP) 24 exports the output of A/D converter 23 with the signal form that can use in controller 27.This signal becomes a current shading value of the brightness of expression subject.
Simultaneously, aperture 21 will represent that the Hall value of current aperture opening offers controller 27.EEPROM is used as storer 25 in this embodiment and stores the benchmark shading value that is set to optimal brightness.
Fig. 3 shows a curve that is used to illustrate the relation between Hall value and the shading value, and when the Hall value became big, when promptly the aperture of aperture 21 broadened, it is big that the shading value of pickoff signals becomes.In addition, when the Hall value surpassed a predetermined value, shading value is certain certain value gradually.The data of curve among the relevant Fig. 3 of controller 27 storages.
When the user did not specify a specific f value, then controller 27 was according to selecting the specific curves shown in Fig. 4 from the current Hall value of aperture 21 outputs with from the current shading value that DSP24 exports.Then, controller 27 is determined corresponding to the Hall value that is stored in the benchmark shading value in the storer 25 on selected curve.Controller 27 produce current Hall values and corresponding to the difference between the benchmark Hall value of benchmark shading value with as the aperture controlling value.Open or stop down 21 according to the aperture controlling value.For aperture control subsequently, controller 27 is controlled the aperture of aperture 21 according to the difference between benchmark Hall value on the selected curve and current Hall value.Therefore, thus the aperture that can control aperture 21 rapidly makes the brightness optimization of the image that picks up from object to a predetermined luminance.
When being imported a f value by the user, key-to-disk 26 outputs to controller 27 with the f value of input.The f value relates to the aperture of aperture, and is inversely proportional to the Hall value of aperture.Controller 27 acquisitions one and the corresponding Hall value of f value.Controller 27 will be on duty with the proportionality constant by following equation expression corresponding to the Hall of f value, and the result that takes advantage of of output institute is with as the aperture controlling value.
The amplitude of aperture controlling value is proportional to the Hall value of aperture 21.
As mentioned above, the iris control apparatus that is used for video camera according to the present invention can be controlled the aperture of aperture rapidly and can pick up the needed brightness of user to the object of being taken the photograph.
Iris control apparatus according to video camera of the present invention is controlled aperture by the software program in controller.Therefore, shutter speed and gain control are all irrelevant with aperture.
Though just some embodiment of the present invention has been made detailed description at this, obviously, can do a large amount of modifications to it without departing from the spirit and scope of the present invention.
Claims (4)
1. iris control apparatus that is used for video camera comprises:
One aperture is used to export the Hall value of representing current aperture aperture;
One device is used to utilize the incident light through this aperture to produce a current shading value;
One storer is used to store a benchmark shading value; And
One control device, be used to store data, and be used for so that current Hall value equals the mode of a Hall value relevant with the benchmark shading value that is stored in storer and this aperture is controlled in utilization by current shading value and the determined curve of current Hall value aperture about the curve that concerns between expression Hall value and the shading value.
2. iris control apparatus according to claim 1, wherein, described control device is controlled the aperture of this aperture according to the difference of Hall value relevant with the benchmark shading value and current Hall value.
3. iris control apparatus that is used for video camera comprises:
One aperture;
One key input section is used to receive the f value from the user; And
Control device is used for basis and the aperture of controlling this aperture from the relevant Hall value of the f value of key input section input.
4. iris control apparatus according to claim 3, wherein, by obtaining the aperture of aperture with proportionality constant with the Hall of relevant f value is on duty, here
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR18774/1996 | 1996-05-30 | ||
| KR18774/96 | 1996-05-30 | ||
| KR1019960018774A KR970078459A (en) | 1996-05-30 | 1996-05-30 | Aperture Control of Camcorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1177121A true CN1177121A (en) | 1998-03-25 |
| CN1075700C CN1075700C (en) | 2001-11-28 |
Family
ID=19460201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97112910A Expired - Fee Related CN1075700C (en) | 1996-05-30 | 1997-05-30 | Iris control apparatus for video camera |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR970078459A (en) |
| CN (1) | CN1075700C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188447A (en) * | 2013-01-18 | 2013-07-03 | 北京中远通科技有限公司 | Diaphragm control system and device for industry |
| CN107807488A (en) * | 2017-10-18 | 2018-03-16 | 维沃移动通信有限公司 | A kind of CCD camera assembly, aperture method of adjustment and mobile terminal |
| CN111064902A (en) * | 2019-12-27 | 2020-04-24 | 重庆紫光华山智安科技有限公司 | Aperture control method and device and exposure control method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100405039B1 (en) * | 2001-11-20 | 2003-11-14 | 고속도로정보통신(주) | Frame grabber with iris control facility |
| JP2005033691A (en) * | 2003-07-11 | 2005-02-03 | Sanyo Electric Co Ltd | Camera module adjustment method |
| CN112532889B (en) * | 2019-09-19 | 2022-05-06 | 杭州海康威视数字技术股份有限公司 | Method and device for determining aperture value of image acquisition equipment |
-
1996
- 1996-05-30 KR KR1019960018774A patent/KR970078459A/en not_active Application Discontinuation
-
1997
- 1997-05-30 CN CN97112910A patent/CN1075700C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188447A (en) * | 2013-01-18 | 2013-07-03 | 北京中远通科技有限公司 | Diaphragm control system and device for industry |
| CN103188447B (en) * | 2013-01-18 | 2016-01-20 | 北京中远通科技有限公司 | A kind of industrial aperture control system, device |
| CN107807488A (en) * | 2017-10-18 | 2018-03-16 | 维沃移动通信有限公司 | A kind of CCD camera assembly, aperture method of adjustment and mobile terminal |
| CN107807488B (en) * | 2017-10-18 | 2020-03-17 | 维沃移动通信有限公司 | Camera assembly, aperture adjusting method and mobile terminal |
| CN111064902A (en) * | 2019-12-27 | 2020-04-24 | 重庆紫光华山智安科技有限公司 | Aperture control method and device and exposure control method |
| CN111064902B (en) * | 2019-12-27 | 2021-05-18 | 重庆紫光华山智安科技有限公司 | Aperture control method and device and exposure control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1075700C (en) | 2001-11-28 |
| KR970078459A (en) | 1997-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4969045A (en) | Image sensing apparatus having automatic iris function of automatically adjusting exposure in response to video signal | |
| US5473374A (en) | Exposing apparatus for performing exposure control corresponding to the luminance level of an object | |
| US8334924B2 (en) | Exposure control for an imaging system | |
| US5258848A (en) | Exposure controller of a video camera | |
| US20050271294A1 (en) | Image binarization apparatus, image binarization method, image pickup apparatus, image pickup method, and a computer product | |
| US20070064141A1 (en) | Digital camera | |
| US6618091B1 (en) | Image pickup apparatus having image signal state adjusting means a response characteristic of which is controlled in accordance with image magnification rate | |
| GB2219461A (en) | Exposure control device | |
| US5057927A (en) | Image sensing apparatus | |
| CN1075700C (en) | Iris control apparatus for video camera | |
| US6700618B1 (en) | Automatic focus-detecting apparatus and method thereof | |
| US6982755B1 (en) | Image sensing apparatus having variable noise reduction control based on zoom operation mode | |
| JP4202555B2 (en) | Display device with light quantity evaluation function and light supply control method | |
| US5087936A (en) | Camera | |
| Schulz et al. | Using brightness histogram to perform optimum auto exposure | |
| CN105898161A (en) | Lens module system, image sensor, and method of controlling lens module | |
| JP3554069B2 (en) | Imaging device | |
| US5541650A (en) | Video camera with low-speed shutter mode and automatic gain and iris control | |
| JPH07245764A (en) | Automatic white balance device | |
| JP3788997B2 (en) | Image signal processing device | |
| JP4360307B2 (en) | Imaging apparatus and exposure control method | |
| JP2879569B2 (en) | Imaging device | |
| JP2564949B2 (en) | Video signal level control device | |
| CN1156246A (en) | Light measuring method | |
| JPH06197269A (en) | Image pickup device and exposure controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20011128 Termination date: 20160530 |