CN104394328B - Auto iris control method - Google Patents
Auto iris control method Download PDFInfo
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- CN104394328B CN104394328B CN201410695270.9A CN201410695270A CN104394328B CN 104394328 B CN104394328 B CN 104394328B CN 201410695270 A CN201410695270 A CN 201410695270A CN 104394328 B CN104394328 B CN 104394328B
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Abstract
The invention discloses a kind of auto iris control method, comprise the following steps：I obtains present intensity；II calculates luminance deviation；III estimates aperture speed；IV estimates brightness acceleration；V calculates motivation value；VI driving aperture actions, aperture action is driven according to aperture motivation value；VII repeats above step I~VI and adjusts aperture to required state.The present invention serves good inhibitory action to machinery inertial, therefore will not cause mechanical concussion due to adding a pair controlled quentity controlled variable relevant with acceleration.There is good compatibility to the aperture of the free position of aperture, and different vendor, while if because the change of external environment causes luminance deviation excessive, regulated quantity is excessive, also can play inhibitory action to it, so as to ensure the stability of aperture.
Description
Technical field
The present invention relates to a kind of auto iris control method, is controlled more particularly to based on the auto iris adaptively adjusted
Method.
Background technology
Video camera is generally all the applications in the change of a wide range of illuminance, therefore, to ensure that video camera can be just
True exposure image, the aperture of camera lens must be just adjusted at any time, to ensure that television image occurs without amplitude limit phenomenon, otherwise may make figure
Make picture gloomy as bright place loses gray-level, or because thang-kng amount reduces and noise occur.But camera position is once solid
After deciding, it is very inconvenient to go to manually adjust aperture daily, video camera is attached auto iris function and (carries
For drive automatic diaphragm lens interface), could in the case where automatic diaphragm lens be coupleds, make video camera output video figure
As signal is automatically kept in standard state.
Smaller yet with the aperture of camera lens, slightly change can cause brightness to change greatly, so as to cause control difficult,
There is also difference for the auto iris control circuit of the camera lens of different manufacturers production simultaneously.Existing auto iris control is caused to calculate
Method, easily there is the problems such as control is slow, and control is inaccurate, shakes back and forth, poor for applicability.
The B of patent CN 102135700 propose a kind of control method, by the difference for comparing present intensity and object brightness
Carry out determination deviation, while the deviation of brightness twice determines its direction of motion and speed before and after contrast, it is relevant with speed by adding
Regulated quantity, although its overshoot can be prevented, due to existing machinery inertial when this method does not consider aperture motion, and aperture
What is adjusted is non-linear, it is impossible to effectively prevents its concussion among mediation process due to machinery inertial appearance.
The content of the invention
The present invention provides a kind of auto iris control method to solve the above problems.
The present invention is adopted the technical scheme that to solve this problem：
The auto iris control method of the present invention, comprises the following steps：
I obtains present intensity, and it is L (m) to obtain present intensity value by photo-sensitive cell, sets aperture regulating time interval phase
Together；
II calculates luminance deviation, according to present intensity value L (m) and target brightness value L determine luminance deviation e (m)=L (m)-
The L and adjustment amount F1 relevant with luminance deviation；
III estimates aperture speed, according to the luminance deviation e (m) and e (m-1) for adjusting acquisition twice, determines the motion of aperture
Direction and speed v (m)=e (m)-e (m-1)/Δ t, and the adjustment amount F2 relevant with aperture speed is estimated, wherein Δ t is twice
Adjust the time interval of brightness value；
IV estimates brightness acceleration, according to the aperture speed v (m) and v (m-1) for adjusting acquisition twice, determines that aperture accelerates
A (m)=v (m)-v (m-1) is spent, and estimates the adjustment amount F3 relevant with aperture acceleration；
V calculate motivation value, according to the regulated quantity F1 relevant with luminance deviation, the adjustment amount F2 relevant with aperture speed, and
The relevant adjustment amount F3 of aperture acceleration, calculate aperture motivation value variable quantity △ F (m)=F1+F2+F3；
VI drives light when the conjunction that this aperture motivation value is variable quantity △ F (m) and present drive voltage according to aperture motivation value
Circle acts；
VII repeats above step I~VI and adjusts aperture to required state；Wherein, m represents bright by sometime interval progress
The number that angle value obtains, and m >=3；
In described step II, the adjustment amount F1=k1*e (m) relevant with luminance deviation=k1* (L (m)-L), wherein k1
For coefficient determine in advance and relevant deviation, determined by the scope that motivation value scope is zoomed to luminance difference；
In described step III, the regulated quantity F2=k2*v (m) relevant with speed=k2* [e (m)-e (m-1)/Δ t)],
Wherein k2 is the coefficient relevant with speed determined in advance；
In described step IV, the regulated quantity F3=k3*a (m) relevant with acceleration=k3* [v (m)-v (m-1)], wherein
K3 is the coefficient relevant with acceleration determined in advance.
In two initial secondary control, no hair calculates the value of last brightness, during velocity amplitude that also can not be last, only needs
Initial value is provided, desired state can be automatically adjusted to by this method.
The present invention has the advantages and positive effects of：The auto iris control method of the present invention, due to add pair with
The relevant controlled quentity controlled variable of acceleration, good inhibitory action is served to machinery inertial, therefore mechanical concussion will not be caused.Such as simultaneously
For fruit because the change of external environment causes luminance deviation excessive, regulated quantity is excessive, also inhibitory action can be played to it, so as to ensure
The stability of aperture.
Brief description of the drawings
Fig. 1 is the automatic aperture adjusting device schematic diagram of the present invention；
Fig. 2 is the auto iris control method flow chart of the present invention.
Embodiment
Referring to the drawings and the auto iris control method of the present invention is described in detail embodiment.
Fig. 1 is the automatic aperture adjusting device schematic diagram of the present invention；Fig. 2 is the auto iris control method flow of the present invention
Figure.As shown in figure 1, a kind of auto iris control method of the present invention, comprises the following steps：
I obtains present intensity, and it is L (m) to obtain current brightness value by photo-sensitive cell；
II calculates luminance deviation, according to present intensity value L (m) and target brightness value L determine luminance deviation e (m)=L (m)-
The L and adjustment amount F1 relevant with luminance deviation；
III estimates aperture speed, according to the luminance deviation e (m) and e (m-1) for adjusting acquisition twice, determines the motion of aperture
Direction and speed v (m)=e (m)-e (m-1)/Δ t, and the adjustment amount F2 relevant with aperture speed is estimated, wherein Δ t is twice
Adjust the time interval of brightness value；
IV estimates brightness acceleration, according to the aperture speed v (m) and v (m-1) for adjusting acquisition twice, determines that aperture accelerates
A (m)=v (m)-v (m-1) is spent, and estimates the adjustment amount F3 relevant with aperture acceleration；
V calculate motivation value, according to the regulated quantity F1 relevant with luminance deviation, the adjustment amount F2 relevant with aperture speed, and
The relevant adjustment amount F3 of aperture acceleration, calculate aperture motivation value variable quantity △ F (m)=F1+F2+F3；
VI drives light when the conjunction that this aperture motivation value is variable quantity △ F (m) and present drive voltage according to aperture motivation value
Circle acts；
VII repeats above step I~VI and adjusts aperture to required state, wherein, m represents bright by sometime interval progress
The number that angle value obtains, and m >=3；
In described step II, the adjustment amount F1=k1*e (m) relevant with luminance deviation=k1* (L (m)-L), wherein k1
For coefficient determine in advance and relevant deviation, determined by the scope that motivation value scope is zoomed to luminance difference；
In described step III, the regulated quantity F2=k2*v (m) relevant with speed=k2* [e (m)-e (m-1)/Δ t)],
Wherein k2 is the coefficient relevant with speed determined in advance；
In described step IV, the regulated quantity F3=k3*a (m) relevant with acceleration=k3* [v (m)-v (m-1)], wherein
K3 is the coefficient relevant with acceleration determined in advance；
In described step II, when luminance deviation e (m) is less than the 5% of present intensity L (m), described and luminance deviation
Relevant adjustment amount F1 is arranged to 0.
The implementation of this method object brightness L, passes through what photo-sensitive cell obtained on condition that aperture regulating time interval is identical
The brightness value of the m times is L (m).
A kind of device of auto iris control as described in Figure 1, including automatic diaphragm lens, photo-sensitive cell, data point
Unit and aperture drive module are analysed, wherein automatic diaphragm lens control thang-kng amount, photo-sensitive cell obtains brightness of image, then passed through
Analysis brightness of image judges the state of aperture and then calculates the motivation value needed for aperture, and then aperture drive module controls aperture
Change.
Present intensity is obtained by photo-sensitive cell first as shown in Figure 2, is designated as L (m), and the object brightness actually wanted to is
L, obtain luminance deviation e (m)=L (m)-L；So that it is determined that the regulated quantity F1=k1*e (m) relevant with luminance deviation=k1* (L
(m)-L), it is ensured that brightness can reach desired target brightness value.Wherein k1 is coefficient determine in advance and that deviation is relevant, is led to
The scope that motivation value scope is zoomed to luminance difference is crossed, and determination is finely adjusted by practice.
Because time interval is identical, therefore can be estimated by the luminance deviation e (m) before and after comparing twice and e (m-1)
The direction of motion and speed v (m) of aperture=e (m)-e (m-1)/Δ t, so that it is determined that the regulated quantity F2=k2*v relevant with speed
(m)=k2* [e (m)-e (m-1)/Δ t)], reaches reduction speed with this, prevents overshoot, realize the stationarity of regulation.Wherein
K2 is the coefficient relevant with speed determined in advance, is determined by putting into practice.
Although in order to prevent overshoot from adding the regulated quantity relevant with speed, consider that aperture has machinery inertial, because
This is excessive, it is necessary to suppress in time, by comparing present speed v (m) and last speed v (m-1), estimation when acceleration change
Acceleration a (m)=v (m)-v (m-1) that aperture moves under current state, so that it is determined that the regulated quantity F3=relevant with acceleration
K3*a (m)=k3* [v (m)-v (m-1)], the applicability of aperture diverse location and the applicability of machinery are realized, can effectively be prevented
The concussion being likely to occur during regulation.Wherein k3 is the coefficient relevant with acceleration determined in advance, is determined by putting into practice.
Changing value △ F (m)=F1+F2+F3 of driving can be calculated by above step.Such as light is driven with voltage
Exemplified by circle action, by this method the variable quantity of its voltage that should apply according to current state, can be determined i.e. in original electricity
△ F (m) are added on the basis of pressure；Wherein △ F (m) value can just can be born.
After value changes are driven, brightness is obtained again, and above-mentioned steps are completed in circulation.
As optimization, sensitivity of the aperture to ambient light is reduced, can be when calculating F1, when luminance deviation e (m) is less than certain
During one scope, it is constant tolerance limit to recommend to choose the 5% of present intensity, and it is 0 to make F1.
The present invention serves good suppression to machinery inertial and made due to adding a pair controlled quentity controlled variable relevant with acceleration
With, therefore mechanical concussion will not be caused.There is good compatibility to the aperture of the free position of aperture, and different vendor, together
For Shi Ruguo because the change of external environment causes luminance deviation excessive, regulated quantity is excessive, also can play inhibitory action to it, so as to
Ensure the stability of aperture.
Claims (2)
1. a kind of auto iris control method, comprises the following steps：
I obtains present intensity, and it is L (m) to obtain present intensity value by photo-sensitive cell, sets aperture regulating time interval identical；
II calculates luminance deviation, according to present intensity value L (m) and target brightness value L determine luminance deviation e (m)=L (m)-L and
The adjustment amount F1 relevant with luminance deviation；
III estimates aperture speed, according to the luminance deviation e (m) and e (m-1) for adjusting acquisition twice, determines the direction of motion of aperture
With speed v (m)=e (m)-e (m-1)/Δ t, and the adjustment amount F2 relevant with aperture speed is estimated, wherein Δ t is to adjust twice
The time interval of brightness value；
IV estimates brightness acceleration, according to the aperture speed v (m) and v (m-1) for adjusting acquisition twice, determines aperture acceleration a
(m)=v (m)-v (m-1), and estimate the adjustment amount F3 relevant with aperture acceleration；
V calculates motivation value, according to the regulated quantity F1 relevant with luminance deviation, the adjustment amount F2 and aperture relevant with aperture speed
The relevant adjustment amount F3 of acceleration, calculate aperture motivation value variable quantity △ F (m)=F1+F2+F3；
VI when this aperture motivation value be variable quantity △ F (m) and present drive voltage and, moved according to aperture motivation value driving aperture
Make；
VII repeats above step I~VI and adjusts aperture to required state；
Wherein, m represents to carry out the number of brightness value acquisition, and m >=3 by sometime interval；
In described step II, the adjustment amount F1=k1*e (m) relevant with luminance deviation=k1* (L (m)-L), wherein k1 are to carry
Coefficient preceding determination and that deviation is relevant, determined by the scope that motivation value scope is zoomed to luminance difference；
In described step III, the regulated quantity F2=k2*v (m) relevant with speed=k2* [e (m)-e (m-1)/Δ t], wherein
K2 is the coefficient relevant with speed determined in advance；
In described step IV, the regulated quantity F3=k3*a (m) relevant with acceleration=k3* [v (m)-v (m-1)], wherein k3 is
The coefficient relevant with acceleration determined in advance.
2. auto iris control method according to claim 1, it is characterised in that：In described step II, when brightness is inclined
When poor e (m) is less than the 5% of present intensity L (m), the adjustment amount F1 relevant with luminance deviation is arranged to 0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410695270.9A CN104394328B (en) | 2014-11-27 | 2014-11-27 | Auto iris control method |
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|---|---|---|---|
| CN201410695270.9A CN104394328B (en) | 2014-11-27 | 2014-11-27 | Auto iris control method |
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| CN104394328A CN104394328A (en) | 2015-03-04 |
| CN104394328B true CN104394328B (en) | 2018-03-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105554404A (en) * | 2016-03-02 | 2016-05-04 | 佛山华国光学器材有限公司 | Light-sensation-controlled aperture variation control method |
| CN106973223B (en) * | 2017-03-03 | 2020-06-05 | 安霸国际有限合伙企业 | Device for adjusting lens aperture |
| CN108156394B (en) * | 2017-12-29 | 2020-05-26 | 浙江大华技术股份有限公司 | Method and device for adjusting aperture |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638366A (en) * | 1984-07-13 | 1987-01-20 | Hitachi Denshi Kabushiki Kaisha | Automatic iris adjustment system |
| JPH08163576A (en) * | 1994-12-02 | 1996-06-21 | Nikon Corp | Iris controller for surface sequential color camera |
| JP2008289032A (en) * | 2007-05-21 | 2008-11-27 | Canon Inc | Imaging apparatus |
| CN101639603A (en) * | 2008-07-31 | 2010-02-03 | 索尼株式会社 | Optical imaging device, lens control method and device |
| CN102135700A (en) * | 2010-01-22 | 2011-07-27 | 杭州海康威视软件有限公司 | Automatic aperture adjusting method and device |
-
2014
- 2014-11-27 CN CN201410695270.9A patent/CN104394328B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638366A (en) * | 1984-07-13 | 1987-01-20 | Hitachi Denshi Kabushiki Kaisha | Automatic iris adjustment system |
| JPH08163576A (en) * | 1994-12-02 | 1996-06-21 | Nikon Corp | Iris controller for surface sequential color camera |
| JP2008289032A (en) * | 2007-05-21 | 2008-11-27 | Canon Inc | Imaging apparatus |
| CN101639603A (en) * | 2008-07-31 | 2010-02-03 | 索尼株式会社 | Optical imaging device, lens control method and device |
| CN102135700A (en) * | 2010-01-22 | 2011-07-27 | 杭州海康威视软件有限公司 | Automatic aperture adjusting method and device |
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Address after: 300384 Tianjin City Huayuan Industrial Zone (outer ring road No. 8) two Haitai branch Applicant after: Tiandi Weiye Technology Co., Ltd. Address before: 300384 Tianjin city Xiqing District Huayuan new technology Industrial Park (outer ring road No. 8) two Haitai branch Applicant before: Tianjin Tiandy Digital Technology Co., Ltd. |
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