CN1547070A - Automatic exposure method under dynamic frame rate condition - Google Patents
Automatic exposure method under dynamic frame rate condition Download PDFInfo
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- CN1547070A CN1547070A CNA2003101172435A CN200310117243A CN1547070A CN 1547070 A CN1547070 A CN 1547070A CN A2003101172435 A CNA2003101172435 A CN A2003101172435A CN 200310117243 A CN200310117243 A CN 200310117243A CN 1547070 A CN1547070 A CN 1547070A
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- 238000004880 explosion Methods 0.000 claims description 9
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Abstract
The invention discloses a kind of automatic exposure method in condition of dynamic frame rate, which belongs to the automatic exposure control field to image quality in the digital imaging device. The invention shortens the time for hardware unit to wait for the software unit, upgrades the efficiency of automatic exposure control, and reduces the consumption of system resources and communication resources. The steps are: 1) sends control interruption frequency instruction to the brightness statistic model according to current frame rate; 2) the brightness statistic model sends the interruption information of the brightness statistic valve to the interruption control unit with correspondent frequency; 3) the automatic exposure control procedure starts the automatic exposure control procedure, works out the exposure time and digital brightness gain parameter; 4) the new exposure time and the digital brightness gain parameter are sent to the other hardware control circuit and optical sensor by the automatic exposure control procedure; 5) the image quality is conciliated under the new exposure time and the digital brightness gain by the other hardware control circuit and the optical sensor.
Description
Technical field
The present invention relates in the digital camera automatic exposure control field, relate in particular to the automatic explosion method under the dynamic frame per second condition picture quality.
Background technology
The frame per second of digital shadow stream is successively decreased along with the increase of the time shutter of optical sensor, and the entry-into-force time that the optical sensor time shutter upgrades for brightness of image, the current frame rate and the time shutter renewal origination point that are flowed by the model of sensor, digital shadow decide.Brightness statistic is in ending place of every two field picture of digital shadow stream in the prior art, calculate the brightness of image statistical value of present frame in real time, and can produce interrupt request, control program software in the automatic exposure control procedure unit is according to each interrupt request, start automatic exposure control procedure, calculate new time shutter and digital brightness gain (may partially or completely keep stable state).Automatic exposure control procedure unit feeds back to other hardware control circuit and optical sensor thereof with new time shutter and digital brightness gain again, realizes automatic exposure function.Like this, automatic exposure control procedure unit is as a software program unit, and to compare travelling speed slower with other hardware cell for it.Automatic exposure control procedure unit is because the uncontrollability of program has uncontrollability from the interrupt instruction that receives the interrupt control unit to the delay of making interrupt response.Therefore, when every two field picture was carried out the picture quality adjusting, hardware cell all will spend the operation and the response of regular hour wait automatic exposure control procedure unit (software unit).Prior art exists such problem: 1) in frame per second faster under the situation, still to all carry out the picture quality adjustment to every two field picture, each hardware cell is waited for the chronic of software unit, the frequent operation of automatic exposure control procedure unit (software unit) has also taken a large amount of system resource, and the communication that has increased software and hardware expends.2) brightness statistic can be sent interrupt request in the optional position of frame, makes that coming into force of automatic exposure control is uncontrollable, causes the scintillation of image.
Summary of the invention
At the problems of the prior art and deficiency, the object of the present invention is to provide the automatic explosion method under a kind of dynamic frame per second condition.It has reduced the time of hardware cell wait software unit, has improved the effect of automatic exposure control, has reduced expending of system resource and communication resources.
In order to realize the foregoing invention purpose, technical scheme of the present invention realizes as follows:
Automatic explosion method under a kind of dynamic frame per second condition the steps include: 1) automatic exposure control procedure unit sends the control interruption frequency according to current frame rate and instructs to brightness statistic; 2) brightness statistic sends the interrupting information of brightness statistics value to the interrupt control unit according to the control interruption frequency instruction that receives with correspondent frequency; 3) automatic exposure control procedure starts automatic exposure control procedure according to each interrupt request of interrupt control unit, calculates new time shutter and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical sensor with new time shutter and digital brightness gain parameter; 5) other hardware control circuit and optical sensor are mediated to picture quality under new time shutter and digital brightness gain.
Above-mentioned steps 2) brightness statistic in can exponential increasing according to the frequency of the interruption that instruction sends of the control interruption frequency that receives or the variation of successively decreasing.
Above-mentioned steps 2) brightness statistic in is fixed on postamble and sends interrupting information to the interrupt control unit.
Above-mentioned steps 3) digital brightness gain parameter in is N/M.N in the digital brightness gain parameter and M can mediate respectively.
Under the slower situation of frame per second, must carry out the image adjustment frame by frame continuously to image; And, in the scope of human vision resolution characteristic tolerance, the adjustment of image quality can be carried out by every interval some frames faster under the situation in frame per second.The instruction that automatic exposure control procedure unit of the present invention sends the control interruption frequency according to current frame per second situation is to brightness statistic, and brightness statistic sends the interrupt instruction of brightness statistics value to the interrupt control unit according to the instruction of the control interruption frequency that receives.In frame per second faster under the situation, brightness statistic can be according to the control interruption frequency instruction that receives, send the control interrupting information to the interrupt control unit with correspondent frequency, like this, the automatic exposure control procedure unit operation is just controlled once in N frame interrupt control unit, every interval.Therefore, the present invention has reduced hardware cell and has waited for automatic exposure control procedure unit (software unit) operation and the time that responds, and has improved the effect of automatic exposure control.The present invention has also reduced shared system resource and the software and hardware communication resources of automatic exposure control procedure unit (software unit) operation and has expended.Frame synchronization control circuit in the brightness statistic of the present invention makes it be fixed on postamble and sends interrupt request, makes automatic exposure be controlled to send the following frame of interrupt request frame to come into force, and has guaranteed the frame synchronization that automatic exposure is regulated.
Description of drawings
Fig. 1 is a workflow diagram of the present invention;
Fig. 2 is for realizing the structure principle chart of apparatus of the present invention;
Fig. 3 is for realizing the structure principle chart of another device of the present invention.
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
Referring to Fig. 3, workflow of the present invention is: 1) automatic exposure control procedure unit is instructed to brightness statistic according to current frame rate transmission control interruption frequency; 2) brightness statistic sends the interrupting information of brightness statistics value to the interrupt control unit according to the control interruption frequency instruction that receives with correspondent frequency; 3) automatic exposure control procedure starts automatic exposure control procedure according to each interrupt request of interrupt control unit, calculates new time shutter and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical sensor with new time shutter and digital brightness gain parameter; 5) other hardware control circuit and optical sensor are mediated to picture quality under new time shutter and digital brightness gain.
Above-mentioned steps 2) brightness statistic in can exponential increasing according to the frequency of the interruption that instruction sends of the control interruption frequency that receives or the variation of successively decreasing.
Referring to Fig. 2, realize device of the present invention, comprise automatic exposure control procedure unit 1, time shutter control module 2, digital brightness gain regulon 4, other image signal processing units 5 and interrupt control unit 6.Described other image signal processing units 5 comprise a brightness statistic 7, the luminance component of each pixel of the view data that described brightness statistic 7 scannings receive, and calculate the brightness statistics value of every frame image, feed back to automatic exposure control procedure unit 1 by interrupt control unit 6 with the interruption form again.Time shutter and brightness gain parameter that described automatic exposure control procedure unit 1 calculates renewal according to the brightness statistics value of gained and current time shutter, described automatic exposure control procedure unit 1 send to be upgraded the time shutter and instructs to described time shutter control module 2.Described time shutter control module 2 acts on optical sensor 3 with new time shutter parameter configuration, and described optical sensor 3 is gathered original image data under new time shutter condition, and is translated into the pictorial data A of digital CFA form.Described optical sensor 1 is conveyed into digital brightness gain regulon 4 with view data A, the new brightness gain parameter that digital brightness gain regulon 4 sends according to automatic exposure control procedure unit 1 is carried out gain-adjusted to each pixel data of view data A and is changed pictorial data B in the adjustable extent of luminance gain.Described digital brightness gain regulon 4 is transferred to other picture intelligence processing unit 5 with view data B and further optimizes and combines, and finally is converted into the pictorial data of yuv format.Described automatic exposure control procedure unit 1 sends the instruction of control interruption frequency to described brightness statistic 7 according to current frame per second situation, described brightness statistic 7 sends the interruption of brightness statistics value to described interrupt control unit 6 according to the instruction of the control interruption frequency that receives with correspondent frequency.
Referring to Fig. 3, realize that another device of the present invention is also to comprise synchronous control unit 9 on basis of the present invention, described brightness statistic 7 also comprises makes it be fixed on the frame synchronization control circuit 10 that postamble sends interrupt request.Described synchronous control unit 9 is compared according to time shutter control module 2 exposure frame number that sends and the luminance gains that the preset delay frame number that comes into force, if reach the delay frame number, the steering order that described synchronous control unit 9 transmission brightness come into force is to described digital brightness gain regulon 4.The luminance gain that above-mentioned synchronous control unit 9 sets in advance comes into force and postpones frame number and can regulate.Above-mentioned digital brightness gain regulon 4 also comprises one when automatic exposure is in steady state (SS), masks the screened circuit module 8 of luminance gain function.
The adjustable extent of the digital brightness gain of above-mentioned digital brightness gain regulon 4 is being successively decreased along with the increase of time shutter.The adjustable extent of digital brightness gain can dispose by the characteristic parameter of time shutter and optical sensor.
The gain parameter of above-mentioned digital brightness gain regulon 4 is N/M.N among the gain parameter N/M and M can regulate respectively.The correction of time shutter, influence the brightness of pictorial data A of the original CFA form of optical sensor output, the digital brightness gain regulating action is on each original pixels (Pixel) data, gain parameter N/M increases image brightness greater than 1, less than 1 minimizing image brightness, equal 1 and keep image brightness.Pictorial data B has embodied the synthesis of time shutter control with the adjusting of digital brightness gain.
Claims (5)
1. the automatic explosion method under the dynamic frame per second condition the steps include: 1) automatic exposure control procedure unit sends the control interruption frequency according to current frame rate and instructs to brightness statistic; 2) brightness statistic sends the interrupting information of brightness statistics value to the interrupt control unit according to the control interruption frequency instruction that receives with correspondent frequency; 3) automatic exposure control procedure starts automatic exposure control procedure according to each interrupt request of interrupt control unit, calculates new time shutter and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical sensor with new time shutter and digital brightness gain parameter; 5) other hardware control circuit and optical sensor are mediated to picture quality under new time shutter and digital brightness gain.
2. according to the automatic explosion method under the described dynamic frame per second condition of claim 1, it is characterized in that described step 2) brightness statistic can exponential increasing according to the frequency of the interruption that instruction sends of the control interruption frequency that receives or the variation of successively decreasing.
3. according to the automatic explosion method under the described dynamic frame per second condition of claim 1, it is characterized in that described step 2) in brightness statistic be fixed on postamble and send interrupting information to the interrupt control unit.
4. according to the automatic explosion method under the described dynamic frame per second condition of claim 1, it is characterized in that the digital brightness gain parameter in the described step 3) is N/M.
5. according to the automatic explosion method under the described dynamic frame per second condition of claim 4, it is characterized in that N in the described digital brightness gain parameter and M can mediate respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101172435A CN100397874C (en) | 2003-12-09 | 2003-12-09 | Automatic exposure method under dynamic frame rate condition |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101172435A CN100397874C (en) | 2003-12-09 | 2003-12-09 | Automatic exposure method under dynamic frame rate condition |
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| CN1547070A true CN1547070A (en) | 2004-11-17 |
| CN100397874C CN100397874C (en) | 2008-06-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440941C (en) * | 2006-12-07 | 2008-12-03 | 北京中星微电子有限公司 | A method of image processing and camera device |
| CN100458540C (en) * | 2006-10-27 | 2009-02-04 | 北京中星微电子有限公司 | Automatic exposure regulating method and device |
| CN102118564A (en) * | 2011-02-17 | 2011-07-06 | 无锡中星微电子有限公司 | Exposure control system and method |
| CN104754200A (en) * | 2013-12-31 | 2015-07-01 | 联芯科技有限公司 | Method and system for adjusting automatic exposure |
| CN113132588A (en) * | 2020-01-15 | 2021-07-16 | 思特威(上海)电子科技股份有限公司 | Method for quickly starting imaging system and imaging system using same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196938A (en) * | 1989-11-20 | 1993-03-23 | Eastman Kodak Company | Solid state fast frame recorder having independently selectable frame rate and exposure |
| US5986705A (en) * | 1997-02-18 | 1999-11-16 | Matsushita Electric Industrial Co., Ltd. | Exposure control system controlling a solid state image sensing device |
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2003
- 2003-12-09 CN CNB2003101172435A patent/CN100397874C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458540C (en) * | 2006-10-27 | 2009-02-04 | 北京中星微电子有限公司 | Automatic exposure regulating method and device |
| CN100440941C (en) * | 2006-12-07 | 2008-12-03 | 北京中星微电子有限公司 | A method of image processing and camera device |
| CN102118564A (en) * | 2011-02-17 | 2011-07-06 | 无锡中星微电子有限公司 | Exposure control system and method |
| CN102118564B (en) * | 2011-02-17 | 2012-12-19 | 无锡中星微电子有限公司 | Exposure control system and method |
| CN104754200A (en) * | 2013-12-31 | 2015-07-01 | 联芯科技有限公司 | Method and system for adjusting automatic exposure |
| CN113132588A (en) * | 2020-01-15 | 2021-07-16 | 思特威(上海)电子科技股份有限公司 | Method for quickly starting imaging system and imaging system using same |
| CN113132588B (en) * | 2020-01-15 | 2022-09-27 | 思特威(上海)电子科技股份有限公司 | Method for quickly starting imaging system and imaging system using same |
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| CN100397874C (en) | 2008-06-25 |
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Effective date of registration: 20210219 Address after: No. 607, 6th floor, shining building, 35 Xueyuan Road, Haidian District, Beijing 100083 Patentee after: BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECHNOLOGY Co.,Ltd. Address before: 100083, Haidian District, Xueyuan Road, Beijing No. 35, Nanjing Ning building, 15 Floor Patentee before: Vimicro Corp. |
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