CN100397874C - Automatic exposure method under dynamic frame rate condition - Google Patents
Automatic exposure method under dynamic frame rate condition Download PDFInfo
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- CN100397874C CN100397874C CNB2003101172435A CN200310117243A CN100397874C CN 100397874 C CN100397874 C CN 100397874C CN B2003101172435 A CNB2003101172435 A CN B2003101172435A CN 200310117243 A CN200310117243 A CN 200310117243A CN 100397874 C CN100397874 C CN 100397874C
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Abstract
The present invention discloses an automatic exposure method under the condition of a dynamic frame rate, which belongs to the field of the automatic exposure control of image quality in digital camera devices. The present invention reduces the waiting time of hardware units wait for software units, increases the effect of the automatic exposure control, and reduces the consumption of system resources and communication resources. The present invention has the following steps: 1, interruption frequency control instructions are sent to a brightness statistic module according to a current frame rate; 2, the brightness statistic module sends the interruption information of a brightness statistic value to an interrupt control unit at a corresponding frequency; 3, an automatic exposure control program is started to calculate new exposure time and digitized brightness gain parameters; 4, the automatic exposure control program sends the new exposure time and the digitized brightness gain parameters to other hardware control circuits and optical sensors; 5, the hardware control circuits and the optical sensors regulate the image quality under the new exposure time and the new digitized brightness gain parameters.
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 for exposure of optical pickocff, and the entry-into-force time that the optical pickocff time for exposure upgrades for image brightness, the current frame rate and the time for exposure renewal origination point that are flowed by the model of transducer, digital shadow decide.Brightness statistic is in ending place of every two field picture of digital shadow stream in the prior art, calculate the image brightness statistical value of present frame in real time, and can produce interrupt requests, control program software in the automatic exposure control procedure unit is according to each interrupt requests, start automatic exposure control procedure, calculate new time for exposure and digital brightness gain (may partially or completely keep stable state).It is the simplest to calculate the present frame brightness statistics value, can carry out tone to image according to certain threshold value filters and binary conversion treatment, and piecemeal asks its brightness average, obtains 0 and 1 two values matrix of forming of taking into account precision and complexity, and determines image brightness according to this matrix.Automatic exposure control procedure unit feeds back to other hardware control circuit and optical pickocff thereof with new time for exposure 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 the speed of service 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 interruption controls 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 requests 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 interruption controls 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 requests of interruption controls unit, calculates new time for exposure and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical pickocff with new time for exposure and digital brightness gain parameter; 5) other hardware control circuit and optical pickocff are mediated to picture quality under new time for exposure 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 interruption controls 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 capability 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 interruption controls 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 interruption controls unit with correspondent frequency, like this, the automatic exposure control procedure unit operation is just controlled once in N frame interruption controls 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 requests, makes automatic exposure be controlled to send the following frame of interrupt requests 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 interruption controls 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 requests of interruption controls unit, calculates new time for exposure and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical pickocff with new time for exposure and digital brightness gain parameter; 5) other hardware control circuit and optical pickocff are mediated to picture quality under new time for exposure 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 for exposure control unit 2, digital brightness gain regulon 4, other image signal processing units 5 and interruption controls 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 interruption controls unit 6 with the interruption form again.Time for exposure 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 for exposure, described automatic exposure control procedure unit 1 send to be upgraded the time for exposure and instructs to described time for exposure control unit 2.Described time for exposure control unit 2 acts on optical pickocff 3 with new time for exposure parameter configuration, and described optical pickocff 3 is gathered original image data under new time for exposure condition, and is translated into the pictorial data A of digital CFA form.Described optical pickocff 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 interruption controls 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 requests.Described synchronous control unit 9 is compared according to time for exposure control unit 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 control command 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 stable state, 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 for exposure.The adjustable extent of digital brightness gain can dispose by the characteristic parameter of time for exposure and optical pickocff.
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 for exposure, influence the brightness of pictorial data A of the original CFA form of optical pickocff 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 for exposure 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 interruption controls 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 requests of interruption controls unit, calculates new time for exposure and digital brightness gain parameter; 4) automatic exposure control procedure sends to other hardware control circuit and optical pickocff with new time for exposure and digital brightness gain parameter; 5) other hardware control circuit and optical pickocff are mediated to picture quality under new time for exposure 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 interruption controls 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 |
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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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| CNB2003101172435A CN100397874C (en) | 2003-12-09 | 2003-12-09 | Automatic exposure method under dynamic frame rate condition |
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| CN100397874C true CN100397874C (en) | 2008-06-25 |
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Families Citing this family (5)
| 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 |
| 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 |
| 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 |
Citations (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
Patent Citations (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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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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Granted publication date: 20080625 |