CN105338235B - A kind of automatic aperture adjusting method and device - Google Patents
A kind of automatic aperture adjusting method and device Download PDFInfo
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- CN105338235B CN105338235B CN201410363411.7A CN201410363411A CN105338235B CN 105338235 B CN105338235 B CN 105338235B CN 201410363411 A CN201410363411 A CN 201410363411A CN 105338235 B CN105338235 B CN 105338235B
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Abstract
The embodiment of the invention discloses a kind of automatic aperture adjusting method and device, method includes：The first brightness adjustment amount is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness；The aperture of automatic diaphragm lens, and/or time for exposure and/or the exposure gain of adjustment imaging sensor are adjusted according to the first brightness adjustment amount, so that the difference of the average brightness of present image and object brightness first meets prerequisite；Determine the corresponding fine setting scope in aperture of automatic diaphragm lens when meeting the first prerequisite, corresponding aperture when the aperture adjustment of automatic diaphragm lens is resolution highest by corresponding aperture when adjusting the aperture of automatic diaphragm lens in fine setting scope to find out resolution highest.The embodiment of the present invention can be improved the total quality of image.
Description
Technical field
The present embodiments relate to camera aperture adjustment technology field more particularly to a kind of automatic aperture adjusting method and
Device.
Background technique
The auto iris of camera lens refers to that some can control light-inletting quantity by adjusting pore size in camera lens
Mechanism adjusts the pore size of aperture using certain strategy, and the suitable figure of brightness can be obtained under different illumination conditions
Picture.
Disclosed in currently used automatic aperture adjusting method such as Chinese patent CN101827217 and CN102135700
, it is the average brightness according to present image, what is adjusted using light-inletting quantity as stop opening is unique according to adjustment stop opening
Size.And the size of stop opening can have an impact the resolution of image, in the case where stop opening is excessive, camera lens at
As the depth of field becomes smaller, it is easy to cause the content clarity shot except visual focus insufficient, the resolution of image is caused to be deteriorated；And
In the case that stop opening is too small, due to the diffraction effect of light, image resolution variation is also resulted in.I.e. merely with light-inletting quantity
For foundation, although the size for adjusting stop opening can guarantee that brightness of image is moderate, the resolution that not can guarantee image is best,
The total quality of finally obtained image or unsatisfactory.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of automatic aperture adjusting method and device, to stop opening into
When row adjustment, the resolution of image can be taken into account, to improve the quality of obtained image.
In a first aspect, automatic aperture adjusting method provided in an embodiment of the present invention, including：
The first brightness adjustment is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness
Amount；
The aperture of the automatic diaphragm lens and/or the exposure of imaging sensor are adjusted according to the first brightness adjustment amount
Between light time and/or the exposure gain of described image sensor, so that the image that the automatic diaphragm lens currently acquire is averaged
The difference of brightness and the object brightness meets the first prerequisite；
The corresponding fine setting scope in aperture for meeting automatic diaphragm lens when first prerequisite is searched, described
The aperture of the adjustment automatic diaphragm lens in fine setting scope；
The aperture for calculating the automatic diaphragm lens described in trim process automatic diaphragm lens acquisition when being different value
Image resolution, find out the aperture of corresponding automatic diaphragm lens when resolution highest；
Corresponding aperture when by the aperture adjustment of the automatic diaphragm lens being the resolution highest.
With reference to first aspect, in the first embodiment of first aspect, by the aperture of the automatic diaphragm lens
It is adjusted to when the resolution highest after corresponding aperture, the method also includes：
The average brightness of the image of automatic diaphragm lens acquisition when according to the resolution highest and the target
The difference of brightness determines the second brightness adjustment amount, when adjusting the exposure of described image sensor according to the second brightness adjustment amount
Between and/or exposure gain, with the average brightness of the image that acquires the automatic diaphragm lens currently and the target
The difference of brightness meets first prerequisite.
With reference to first aspect or the first embodiment of first aspect, in second of embodiment of first aspect,
Before the average brightness of the image acquired according to automatic diaphragm lens and the difference of object brightness determine the first brightness adjustment amount,
The method also includes：
Judge whether the average brightness and the difference of history average brightness meet the second prerequisite, if described average bright
The difference of degree and history average brightness meets second prerequisite, then triggers the image acquired according to automatic diaphragm lens
The difference of average brightness and object brightness determines the step of the first brightness adjustment amount.
With reference to first aspect or second of embodiment of the first embodiment of first aspect or first aspect, exist
In the third embodiment of first aspect, the calculation method of the average brightness of the image of the automatic diaphragm lens acquisition is such as
Under：
Wherein YavgIndicate the average brightness of image, NblockIndicate the block counts of image, YiIndicate i-th
The brightness of a block, WiIndicate the weight coefficient of i-th of block, NpixelIndicate the sum of all pixels of image.
With reference to first aspect or second of embodiment of the first embodiment of first aspect or first aspect, or
The third embodiment of first aspect, it is described according to the first brightness tune in the 4th kind of embodiment of first aspect
Whole amount adjusts the aperture of the automatic diaphragm lens and/or the time for exposure of imaging sensor and/or described image sensor
Exposure gain specifically include：The time for exposure for first adjusting imaging sensor, the aperture of automatic diaphragm lens is then adjusted, finally
Adjust the exposure gain of imaging sensor.
With reference to first aspect or second of embodiment of the first embodiment of first aspect or first aspect, or
The third embodiment of first aspect or the 4th kind of embodiment of first aspect, in the 5th kind of embodiment party of first aspect
In formula, different fine setting scopes corresponds to different adjustment steppings, described that the auto iris mirror is adjusted in the fine setting scope
The aperture of head includes：
According to automatic diaphragm lens described in adjustment step by step modulating corresponding with the fine setting scope in the fine setting scope
Aperture；
The aperture for calculating the automatic diaphragm lens described in trim process automatic diaphragm lens when being different value
The resolution of the image of acquisition includes：
According to the every aperture for adjusting the primary automatic diaphragm lens of adjustment stepping corresponding with the fine setting scope, just count
Calculate the resolution of an image.
With reference to first aspect or second of embodiment of the first embodiment of first aspect or first aspect, or
The 5th kind of embodiment party of the third embodiment of first aspect or the 4th kind of embodiment of first aspect or first aspect
Formula, in the 6th kind of embodiment of first aspect, the resolution of the image for calculating the automatic diaphragm lens acquisition
Method is as follows：
Wherein, FVtIndicate image
Resolution, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate that vertical direction Sobel Operator, W (x, y) indicate solution
Picture degree weight, P (x, y) indicate center pixel matrix, and the adjustment in the aperture of the automatic diaphragm lens will lead to the change of P (x, y)
Change.
Second aspect, automatic aperture adjusting device provided in an embodiment of the present invention, including：
Determination unit, the average brightness of the image for being acquired according to automatic diaphragm lens and the difference of object brightness determine
First brightness adjustment amount；
Coarse adjustment unit, for adjusting the aperture of the automatic diaphragm lens, and/or figure according to the first brightness adjustment amount
As the time for exposure of sensor and/or the exposure gain of described image sensor, so that the automatic diaphragm lens currently acquire
Image average brightness and the object brightness difference meet the first prerequisite；
Searching unit, the aperture that automatic diaphragm lens when first prerequisite are met for searching are corresponding micro-
Adjust range；
Fine-adjusting unit, for adjusting the aperture of the automatic diaphragm lens in the fine setting scope；
Computing unit, the aperture for calculating the automatic diaphragm lens described in trim process are described automatic when being different value
The resolution of the image of aperture camera lens acquisition, finds out the aperture of corresponding automatic diaphragm lens when resolution highest；
The fine-adjusting unit is also used to, and the aperture adjustment of the automatic diaphragm lens is corresponded to when the resolution highest
Aperture.
In conjunction with second aspect, in the first embodiment of second aspect, the determination unit is also used to, according to described
The average brightness of image and the difference of the object brightness of automatic diaphragm lens acquisition when resolution highest determine the
Two brightness adjustment amounts；
The fine-adjusting unit is also used to, and the time for exposure of described image sensor is adjusted according to the second brightness adjustment amount
And/or exposure gain, it is bright with the average brightness of the image that acquires the automatic diaphragm lens currently and the target
The difference of degree meets first prerequisite.
In conjunction with the first of second aspect or second aspect embodiment, in second of embodiment of second aspect,
Described device further includes：
Judging unit, for judging whether the average brightness and the difference of history average brightness meet the second preset item
Part triggers the determination unit if the difference of the average brightness and history average brightness meets second prerequisite
The first brightness adjustment amount is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness.
In conjunction with the first of second aspect or second aspect embodiment or second of embodiment of second aspect,
In the third embodiment of second aspect, the computing unit is also used to calculate the image of the automatic diaphragm lens acquisition
Average brightness, specific calculation method are as follows：
Wherein YavgIndicate the average brightness of image, NblockIndicate the block counts of image, YiIndicate i-th
The brightness of a block, WiIndicate the weight coefficient of i-th of block, NpixelIndicate the sum of all pixels of image.
In conjunction with the first of second aspect or second aspect embodiment or second of embodiment of second aspect, or
The third embodiment of second aspect, in the 4th kind of embodiment of second aspect, the coarse adjustment unit is according to described
One brightness adjustment amount adjusts the aperture of the automatic diaphragm lens and/or the time for exposure of imaging sensor and/or the figure
As the exposure gain of sensor specifically includes：The time for exposure for first adjusting imaging sensor, then adjust automatic diaphragm lens
Aperture finally adjusts the exposure gain of imaging sensor.
In conjunction with the first of second aspect or second aspect embodiment or second of embodiment of second aspect, or
The third embodiment of second aspect or the 4th kind of embodiment of second aspect, in the 5th kind of embodiment party of second aspect
In formula, different fine setting scopes corresponds to different adjustment steppings；
The fine-adjusting unit is specifically used for：According to adjustment stepping corresponding with the fine setting scope in the fine setting scope
Adjust the aperture of the automatic diaphragm lens；
The computing unit is specifically used for：According to the every adjustment of adjustment stepping corresponding with the fine setting scope it is primary described from
The aperture of dynamic aperture camera lens, just calculates the resolution of an image.
In conjunction with the first of second aspect or second aspect embodiment or second of embodiment of second aspect, or
The 5th kind of embodiment party of the third embodiment of second aspect or the 4th kind of embodiment of second aspect or second aspect
Formula, in the 6th kind of embodiment of second aspect, the method that the computing unit calculates the resolution of image is specific as follows：
Wherein, FVtIndicate the solution of image
Picture degree, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate that vertical direction Sobel Operator, W (x, y) indicate solution picture
Weight is spent, P (x, y) indicates center pixel matrix, and the adjustment in the aperture of the automatic diaphragm lens will lead to the variation of P (x, y).
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages that：
In the embodiment of the present invention, the first brightness adjustment is determined according to the difference of the average brightness of image and object brightness first
Amount adjusts the aperture of automatic diaphragm lens and/or the time for exposure of imaging sensor, and/or figure according to the first brightness adjustment amount
As the exposure gain of sensor, so that brightness of image is met the requirements, the adjustment of this step is equivalent to coarse adjustment, then according to coarse adjustment
The corresponding fine setting scope in the aperture of auto iris is finely adjusted the aperture of auto iris afterwards, to find out the resolution highest of image
When corresponding automatic diaphragm lens aperture, corresponding aperture when by the aperture adjustment of automatic diaphragm lens to resolution highest,
Finally while guaranteeing that brightness of image is moderate, it ensure that image has optimal resolution, improve the quality of image.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is automatic aperture adjusting method one embodiment schematic diagram of the present invention；
Fig. 2 is automatic aperture adjusting device one embodiment schematic diagram of the present invention；
Fig. 3 is another embodiment schematic diagram of automatic aperture adjusting device of the present invention；
Fig. 4 is the aperture schematic diagram of corresponding automatic diaphragm lens when present invention lookup resolution is optimal.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention is described, and shows
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
The embodiment of the invention provides a kind of automatic aperture adjusting method and device, to stop opening be adjusted when
It waits, the resolution of image can be taken into account, to improve obtained picture quality.
Referring to Fig. 1, automatic aperture adjusting method one embodiment of the present invention includes：
101, the first brightness is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness
Adjustment amount；
102, when according to the exposure of the aperture of the first brightness adjustment amount adjustment automatic diaphragm lens and/or imaging sensor
Between and/or imaging sensor exposure gain so that the average brightness for the image that automatic diaphragm lens currently acquire and target are bright
The difference of degree meets the first prerequisite；
Step 101 to step 102 is equivalent to the process of coarse adjustment, and the purpose of coarse adjustment is to guarantee that automatic diaphragm lens can acquire
To image and guarantee that the brightness of image of acquisition is moderate, to provide base for the subsequent resolution for calculating image and determining fine setting scope
Plinth.
103, the corresponding fine setting scope in aperture for searching automatic diaphragm lens when meeting the first prerequisite, in the fine tuning
The aperture of adjustment automatic diaphragm lens in range；
104, the figure of automatic diaphragm lens acquisition when the aperture for calculating the automatic diaphragm lens in trim process is different value
The resolution of picture finds out the aperture of corresponding automatic diaphragm lens when resolution highest；
105, corresponding aperture when being resolution highest by the aperture adjustment of automatic diaphragm lens.
For ease of understanding, the automatic aperture adjusting method that an embodiment of the present invention will be described in detail below provides.
Image to be captured is incident on imaging sensor imaging, adjusts automatic diaphragm lens after automatic diaphragm lens
Aperture, the time for exposure of imaging sensor, any one or several combinations in exposure gain can be realized flat to image
The adjustment of equal brightness.
Specifically in the present embodiment, image is acquired first with automatic diaphragm lens, calculates the average bright of acquired image
Degree, the average brightness of image can be calculated as follows：
In this formula, YavgIndicate the average brightness of image, NblockIndicate the block counts of image, Yi
Indicate the brightness of i-th of block, WiIndicate the weight coefficient of i-th of block, WiIt can preset as needed, NpixelIndicate image
Sum of all pixels.
In the concrete realization, automatic aperture adjusting device can utilize automatic diaphragm lens real-time image acquisition and calculate and be adopted
The average brightness of the image of collection, then being averaged all images acquired in the preset time period before this Image Acquisition
Brightness is averaged to obtain history average brightness.After the average brightness for calculating the image currently acquired, it can determine whether current
Whether the average brightness of the image of acquisition and the difference of history average brightness meet the second prerequisite, specifically, can determine whether public affairs
Formula | Yavg-YhWhether | >=Thr is true, wherein YhIndicate that the history average brightness of image, Thr indicate jump in brightness detection threshold value,
As the average brightness Y of imageavgWhen meeting above-mentioned formula, illustrates that brightness of image is mutated, need to adjust.
Specific method of adjustment is as follows：According to the average brightness Y of imageavgWith object brightness YtagDifference determine that first is bright
Adjustment amount is spent, object brightness can be preset according to the actual situation, after determining the first brightness adjustment amount, according to the first brightness
Adjustment amount adjusts the exposure in the aperture of automatic diaphragm lens and/or the time for exposure of imaging sensor and/or imaging sensor
Gain, so that the difference of the average brightness for the image that automatic diaphragm lens currently acquire and object brightness meets the first preset item
Part.
The method specifically adjusted can be as follows：The time for exposure for first adjusting imaging sensor, then adjust automatic diaphragm lens
Aperture, finally adjust imaging sensor exposure gain, in this order adjustment can guarantee to obtain best image
Signal-to-noise ratio, to improve the quality of image.
In addition, the average brightness for the image for acquiring automatic diaphragm lens and the difference of object brightness meet the first preset item
The judgment method of part can be as follows：The average brightness of the image of acquisition is set to meet formula:Wherein YkTable
The average brightness value of diagram picture, YtagIndicate that target brightness value, T indicate that brightness stability determines time window length, Thr2 indicates brightness
Stablize decision threshold, Thr2 can be preset.I.e. as the average brightness Y of the image of automatic diaphragm lens acquisitionkMeet formulaWhen, temporarily terminate to adjust.
Above-mentioned adjustment process is coarse tuning process, can only guarantee that the brightness of image is moderate.Next it is searched according to look-up table full
The corresponding fine setting scope in aperture of automatic diaphragm lens when the first prerequisite of foot, look-up table can be as follows：
| Current stop opening | Finely tune initial position | Finely tune final position | Adjust stepping |
| F5.6 | F5.6 | F2.8 | 1 |
| F4.0 | F5.6 | F2.4 | 2 |
| F2.8 | F4.0 | F2.0 | 2 |
| F2.4 | F4.0 | F2.0 | 2 |
| F2.0 | F2.8 | F1.8 | 3 |
| F1.8 | F2.4 | F1.8 | 3 |
As can be seen from the above table, different stop openings corresponds to different fine setting scopes, and different fine setting scopes is corresponding not
Same adjustment stepping.According to the aperture of the corresponding fine setting scope adjustment automatic diaphragm lens of stop opening after coarse adjustment, adjustment
Stepping be the corresponding stepping of the fine setting scope.According to adjustment stepping corresponding with a fine setting scope auto iris of every adjustment
The aperture of camera lens just calculates the resolution of an image.The resolution of image can be calculated according to following formula：
Wherein, FVtIndicate the solution of image
Picture degree, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate vertical direction Sobel Operator, Osobel.xAnd Osobel.y
For fixed value, W (x, y) indicates resolution weight, can preset, and P (x, y) indicates center pixel matrix, center pixel matrix i.e. with
Picture element matrix centered on (x, y) coordinate of image, the adjustment in the aperture of automatic diaphragm lens will lead to the variation of P (x, y).
It finds out when being adjusted in fine setting scope, the hole of corresponding automatic diaphragm lens when the resolution of image is maximized
Diameter, search procedure can be as shown in figure 4, aperture IRIS control the change in the aperture of the variation decision automatic diaphragm lens of voltage in Fig. 4
Change, different IRIS control voltage values corresponds to the aperture value of different automatic diaphragm lens, i.e., when IRIS control voltage value is different
When, the aperture value of automatic diaphragm lens is also different, therefore, can control voltage value by adjusting IRIS to adjust auto iris mirror
The aperture of head.In Fig. 4, entire adjustment process is searched it is found that the resolution of image has maximum when IRIS control voltage is 400
Therefore IRIS control voltage after lookup, is adjusted to 400, keeps the aperture of automatic diaphragm lens at this time constant by value
(i.e. guarantee IRIS control voltage is constant), that is, can guarantee that the resolution of image is optimal.
Image is acquired using automatic diaphragm lens of the resolution of image when optimal, judges being averaged for the image currently acquired
Whether the difference of brightness and object brightness still meets the first prerequisite, if satisfied, during then showing fine tuning, to automatic light
Influence of the adjustment in the aperture of circle camera lens to the average brightness of image is within the acceptable range；If not satisfied, then explanation pair
The adjustment in the aperture of automatic diaphragm lens is affected to brightness of image, has had exceeded acceptable range, at this point, can basis
The average brightness of current image and the difference of object brightness determine the second brightness adjustment amount, then according to the second brightness adjustment amount
Time for exposure and/or the exposure gain of imaging sensor are adjusted, only with the image for acquiring automatic diaphragm lens currently
Average brightness and object brightness difference meet the first prerequisite, again adjust imaging sensor time for exposure and/or
Exposure gain is to compensate for the influence that the aperture of fine tuning automatic diaphragm lens generates brightness of image.After entire fine tuning, benefit
The image acquired with automatic diaphragm lens is that can guarantee that the brightness of image is met the requirements, and can guarantee that the resolution of image is best,
Improve the quality of image.
Automatic aperture adjusting device provided in an embodiment of the present invention is described below, referring to Fig. 2, automatic aperture adjusting device
200 include：
Determination unit 201, the average brightness of the image for being acquired according to automatic diaphragm lens and the difference of object brightness
Determine the first brightness adjustment amount；
Coarse adjustment unit 202, aperture and/or image for adjusting automatic diaphragm lens according to the first brightness adjustment amount pass
The time for exposure of sensor and/or the exposure gain of imaging sensor, so that the image that automatic diaphragm lens currently acquire is averaged
The difference of brightness and object brightness meets the first prerequisite；
Searching unit 203, the corresponding fine tuning model in aperture of automatic diaphragm lens when meeting the first prerequisite for searching
It encloses；
Fine-adjusting unit 204, for adjusting the aperture of automatic diaphragm lens in the fine setting scope that searching unit 203 is found；
Computing unit 205, the auto iris when aperture for calculating the automatic diaphragm lens in trim process is different value
The resolution of the image of camera lens acquisition, finds out the aperture of corresponding automatic diaphragm lens when resolution highest；
Fine-adjusting unit 204 is also used to, corresponding aperture when by the aperture adjustment of automatic diaphragm lens being resolution highest.
In addition, determination unit 201 is also used to, the image of automatic diaphragm lens acquisition when according to resolution highest is averaged
The difference of brightness and object brightness determines the second brightness adjustment amount；
Fine-adjusting unit 204 is also used to, and time for exposure and/or the exposure of imaging sensor are adjusted according to the second brightness adjustment amount
Gain meets the first preset item with the difference of the average brightness for the image for acquiring automatic diaphragm lens and object brightness
Part.
In addition, automatic aperture adjusting device 200 further includes：
Judging unit 207, for judging whether average brightness and the difference of history average brightness meet the second prerequisite,
If the difference of average brightness and history average brightness meets the second prerequisite, determination unit 201 is triggered according to auto iris
The average brightness of image and the difference of object brightness of camera lens acquisition determine the first brightness adjustment amount.
Automatic aperture adjusting device to further understand the present invention adjusts dress to the auto iris in the present embodiment below
The interactive mode set between each unit in 200 is illustrated, specific as follows：
Image to be captured is incident on imaging sensor imaging, adjusts automatic diaphragm lens after automatic diaphragm lens
Aperture, the time for exposure of imaging sensor, any one or several combinations in exposure gain can be realized flat to image
The adjustment of equal brightness.
Firstly, computing unit 205 calculates the average brightness of the image of automatic diaphragm lens acquisition, the average brightness of image can
It is calculated as follows：
In this formula, YavgIndicate the average brightness of image, NblockIndicate the block counts of image, Yi
Indicate the brightness of i-th of block, WiIndicate the weight coefficient of i-th of block, WiIt can preset as needed, NpixelIndicate image
Sum of all pixels.
In the concrete realization, computing unit 205 can calculate the average brightness of the image of automatic diaphragm lens acquisition in real time, so
The average brightness for all images for acquiring and being calculated in the preset time period before this Image Acquisition is averaged afterwards
Value obtains history average brightness.After the average brightness for calculating the image currently acquired, the judgement of judging unit 206 calculates single
Whether the average brightness of first 205 images calculated and the difference of history average brightness meet the second prerequisite, specifically, sentence
Disconnected unit 207 can determine whether formula | Yavg-YhWhether | >=Thr is true, wherein YhIndicate that the history average brightness of image, Thr indicate
Jump in brightness detection threshold value, as the average brightness Y of imageavgWhen meeting above-mentioned formula, illustrates that brightness of image is mutated, need to adjust.
Specific method of adjustment is as follows：The average brightness Y for the image that determination unit 201 is calculated according to computing unit 205avg
With object brightness YtagDifference determine that the first brightness adjustment amount, object brightness can be preset according to the actual situation, determining
After one brightness adjustment amount, coarse adjustment unit 202 adjusts the aperture of automatic diaphragm lens, and/or figure according to the first brightness adjustment amount
As the time for exposure of sensor and/or the exposure gain of imaging sensor, so that the image that automatic diaphragm lens currently acquire
The difference of average brightness and object brightness meets the first prerequisite.
The method that coarse adjustment unit 202 adjusts specifically can be as follows：The time for exposure of imaging sensor is first adjusted, is then adjusted certainly
The aperture of dynamic aperture camera lens, finally adjusts the exposure gain of imaging sensor, and adjustment is to guarantee in this order
To best signal noise ratio (snr) of image, to improve the quality of image.
In addition, the adjustment of coarse adjustment unit 202 is so that the average brightness and target of the image that automatic diaphragm lens currently acquire are bright
The judgment method that the difference of degree meets the first prerequisite can be as follows：The average brightness of the image currently acquired is set to meet formula:Wherein YkIndicate the average brightness value of image, YtagIndicate that target brightness value, T indicate brightness stability
Determine time window length, Thr2 indicates that brightness stability decision threshold, Thr2 can be preset.Currently acquired when automatic diaphragm lens
The average brightness of image meets formulaWhen, coarse adjustment unit 202 terminates adjustment.
Above-mentioned adjustment process is coarse tuning process, can only guarantee that the brightness of image is moderate.Following searching unit 203 is according to looking into
Table is looked for search the corresponding fine setting scope in aperture of automatic diaphragm lens when meeting the first prerequisite, look-up table can be as follows：
| Current stop opening | Finely tune initial position | Finely tune final position | Adjust stepping |
| F5.6 | F5.6 | F2.8 | 1 |
| F4.0 | F5.6 | F2.4 | 2 |
| F2.8 | F4.0 | F2.0 | 2 |
| F2.4 | F4.0 | F2.0 | 2 |
| F2.0 | F2.8 | F1.8 | 3 |
| F1.8 | F2.4 | F1.8 | 3 |
As can be seen from the above table, different stop openings corresponds to different fine setting scopes, and different fine setting scopes is corresponding not
Same adjustment stepping.Fine-adjusting unit 204 adjusts automatic diaphragm lens according to the corresponding fine setting scope of stop opening after coarse adjustment
Aperture, the stepping of adjustment is the corresponding stepping of the fine setting scope.Fine-adjusting unit 204 is according to adjustment corresponding with the fine setting scope
As soon as the aperture of the every adjustment time automatic diaphragm lens of stepping, computing unit 205 calculate the resolution of an image.The solution picture of image
Degree can be calculated according to following formula：
Wherein, FVtIndicate the solution of image
Picture degree, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate vertical direction Sobel Operator, Osobel.xAnd Osobel.y
For fixed value, W (x, y) indicates resolution weight, can preset, and P (x, y) indicates center pixel matrix, center pixel matrix i.e. with
Picture element matrix centered on (x, y) coordinate of image, the adjustment in the aperture of automatic diaphragm lens will lead to the variation of P (x, y).
Computing unit 205 is found out when adjusting in fine setting scope, corresponding automatic light when the resolution of image is maximized
The aperture of camera lens is enclosed, search procedure can be as shown in figure 4, IRIS controls the hole of the variation decision automatic diaphragm lens of voltage in Fig. 4
The variation of diameter, different IRIS control voltage values corresponds to the aperture value of different automatic diaphragm lens, i.e., when IRIS controls voltage
When being worth different, the aperture value of automatic diaphragm lens is also different, therefore, it is automatic to adjust voltage value can be controlled by adjusting IRIS
The aperture of aperture camera lens.In Fig. 4, entire adjustment process is searched it is found that when IRIS control voltage is 400, the resolution of image
There is maximum value, therefore, after lookup, IRIS can be controlled voltage and be adjusted to 400 by fine-adjusting unit 204, keep at this time automatic
The aperture that aperture controls camera lens is constant (i.e. guarantee IRIS control voltage is constant), that is, can guarantee that the resolution of image is optimal.
Next image is acquired using automatic diaphragm lens of the resolution of image when optimal, judging unit 206 can determine whether
Whether the average brightness of the image currently acquired and the difference of object brightness still meet the first prerequisite, if satisfied, then showing
During fine tuning, influence of the fine-adjusting unit 204 to the adjustment in the aperture of automatic diaphragm lens to the average brightness of image is can
Within the scope of receiving；If not satisfied, bright to image to the adjustment in the aperture of automatic diaphragm lens during then illustrating fine tuning
Being affected for degree, has had exceeded acceptable range, at this point, can be by determination unit 201 according to the brightness of image currently acquired
And object brightness determines the second brightness adjustment amount, then fine-adjusting unit 204 only adjusts image sensing according to the second brightness adjustment amount
The time for exposure of device and/or exposure gain, with the average brightness and mesh of the image for acquiring automatic diaphragm lens currently
The difference for marking brightness meets the first prerequisite.Again adjust imaging sensor time for exposure and/or exposure gain be in order to
The influence that the aperture of compensation fine tuning automatic diaphragm lens generates brightness of image.After entire fine tuning, automatic diaphragm lens are utilized
The image of acquisition is that can guarantee that the brightness of image is met the requirements, and can guarantee that the resolution of image is best, improves the matter of image
Amount.
Below referring to Fig. 3, Fig. 3 provides another embodiment schematic diagram of automatic aperture adjusting device of the present invention, this reality
The automatic aperture adjusting device 300 for applying example can be used for implementing automatic aperture adjusting method provided by the above embodiment, in reality
In, automatic aperture adjusting device 300 is desirably integrated into comprising video camera, camera and other equipment that can be imaged
In, which can be mobile phone, tablet computer, medical imaging device etc..
In a specific embodiment：Automatic aperture adjusting device 300 may include processor 301 and memory 302, deposit
Reservoir 302 refers to for storing computer operation instruction, processor 301 for executing the computer operation stored in memory 302
It enables, processor 301 executes the computer operation instruction stored in memory 302 and automatic aperture adjusting device 300 is realized such as
Lower operation：
The first brightness adjustment is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness
Amount；
The aperture of the automatic diaphragm lens and/or the exposure of imaging sensor are adjusted according to the first brightness adjustment amount
Between light time and/or the exposure gain of described image sensor, so that the image that the automatic diaphragm lens currently acquire is averaged
The difference of brightness and the object brightness meets the first prerequisite；
The corresponding fine setting scope in aperture for meeting automatic diaphragm lens when first prerequisite is searched, described
The aperture of the adjustment automatic diaphragm lens in fine setting scope；
The aperture for calculating the automatic diaphragm lens described in trim process automatic diaphragm lens acquisition when being different value
Image resolution, find out the aperture of corresponding automatic diaphragm lens when resolution highest；
Corresponding aperture when by the aperture adjustment of the automatic diaphragm lens being the resolution highest.
Optionally, processor 301 executes the computer operation instruction stored in memory 302 and is also used to so that auto iris
Adjustment device 300 realizes following operation：It is corresponding when being the resolution highest by the aperture adjustment of the automatic diaphragm lens
Aperture after, the average brightness and the mesh of the image of automatic diaphragm lens when according to resolution highest acquisition
The difference of mark brightness determines the second brightness adjustment amount, and the exposure of described image sensor is adjusted according to the second brightness adjustment amount
Time and/or exposure gain, with the average brightness and the mesh of the image for acquiring the automatic diaphragm lens currently
The difference of mark brightness meets first prerequisite.
Optionally, processor 301 executes the computer operation instruction stored in memory 302 and is also used to so that auto iris
Adjustment device 300 realizes following operation：In the average brightness of the image acquired according to automatic diaphragm lens and the difference of object brightness
It is worth before the first brightness adjustment amount that determines, it is preset judges whether the difference of the average brightness and history average brightness meets second
Condition triggers if the difference of the average brightness and history average brightness meets second prerequisite according to automatic light
The step of average brightness of image and the difference of object brightness of circle camera lens acquisition determine the first brightness adjustment amount.
Optionally, processor 301 executes the computer operation instruction stored in memory 302 and is also used to so that auto iris
Adjustment device 300 realizes following operation：Calculate the average brightness of the image of the automatic diaphragm lens acquisition, circular
It is as follows：
Wherein YavgIndicate the average brightness of image, NblockIndicate the block counts of image, YiIndicate i-th
The brightness of a block, WiIndicate the weight coefficient of i-th of block, NpixelIndicate the sum of all pixels of image.
Optionally, the computer operation instruction stored in the execution of processor 301 memory 302 makes auto iris adjustment dress
Set 300 according to the first brightness adjustment amount adjust the automatic diaphragm lens aperture and/or imaging sensor exposure when
Between and/or the exposure gain of described image sensor specifically include：It the time for exposure for first adjusting imaging sensor, then adjusts
The aperture of automatic diaphragm lens finally adjusts the exposure gain of imaging sensor.
Optionally, different fine setting scopes corresponds to different adjustment steppings, and processor 301 executes to be stored in memory 302
Computer operation instruction make automatic aperture adjusting device 300 adjust the automatic diaphragm lens in the fine setting scope
Aperture includes：According to automatic diaphragm lens described in adjustment step by step modulating corresponding with the fine setting scope in the fine setting scope
Aperture；
Processor 301 executes the computer operation instruction stored in memory 302 and automatic aperture adjusting device 300 is counted
The solution of the aperture for calculating the automatic diaphragm lens described in trim process image of automatic diaphragm lens acquisition when being different value
As degree includes：According to the every aperture for adjusting the primary automatic diaphragm lens of adjustment stepping corresponding with the fine setting scope, just
Calculate the resolution of an image.
Optionally, the computer operation instruction stored in the execution of processor 301 memory 302 makes auto iris adjustment dress
The method for setting the resolution of the image of the 300 calculating automatic diaphragm lens acquisition is as follows：
Wherein, FVtIndicate image
Resolution, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate that vertical direction Sobel Operator, W (x, y) indicate solution
Picture degree weight, P (x, y) indicate center pixel matrix, and the adjustment in the aperture of the automatic diaphragm lens will lead to the change of P (x, y)
Change.
It should be noted that in embodiments of the present invention, automatic diaphragm lens and imaging sensor can be integrated in automatic light
On circle adjustment device 300, a part as automatic aperture adjusting device 300 itself；Or automatic diaphragm lens and image pass
Sensor can also be separated with automatic aperture adjusting device 300, be individually present.Auto iris adjustment dress provided in an embodiment of the present invention
300 are set, can be also used for realizing other functions in above-mentioned apparatus embodiment, details are not described herein.
In addition it should be noted that, the apparatus embodiments described above are merely exemplary, wherein described as separation
The unit of part description may or may not be physically separated, component shown as a unit can be or
It can not be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to reality
Border needs to select some or all of the modules therein to achieve the purpose of the solution of this embodiment.In addition, provided by the invention
In Installation practice attached drawing, the connection relationship between module indicates there is communication connection between them, specifically can be implemented as one
Item or a plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, it can
It understands and implements.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can borrow
Help software that the mode of required common hardware is added to realize, naturally it is also possible to by specialized hardware include specific integrated circuit, specially
It is realized with CPU, private memory, special components and parts etc..Under normal circumstances, all functions of being completed by computer program are ok
It is easily realized with corresponding hardware, moreover, being used to realize that the specific hardware structure of same function is also possible to a variety of more
Sample, such as analog circuit, digital circuit or special circuit etc..But software program is real in situations more for the purpose of the present invention
It is now more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words makes the prior art
The part of contribution can be embodied in the form of software products, which is stored in the storage medium that can be read
In, such as the floppy disk of computer, USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory
Device (RAM, Random Access Memory), magnetic or disk etc., including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
It is provided for the embodiments of the invention a kind of automatic aperture adjusting method above and device is described in detail, it is right
In those of ordinary skill in the art, thought according to an embodiment of the present invention can in specific embodiments and applications
There is change place, therefore, the contents of this specification are not to be construed as limiting the invention.
Claims (12)
1. a kind of automatic aperture adjusting method, which is characterized in that including：
The first brightness adjustment amount is determined according to the average brightness of image of automatic diaphragm lens acquisition and the difference of object brightness；
According to the first brightness adjustment amount adjust the automatic diaphragm lens aperture and/or imaging sensor exposure when
Between and/or described image sensor exposure gain so that the average brightness for the image that the automatic diaphragm lens currently acquire
Meet the first prerequisite with the difference of the object brightness；
The corresponding fine setting scope in aperture for meeting automatic diaphragm lens when first prerequisite is searched, in the fine tuning
The aperture of the adjustment automatic diaphragm lens in range；
The figure of the aperture for calculating the automatic diaphragm lens described in trim process automatic diaphragm lens acquisition when being different value
The resolution of picture finds out the aperture of corresponding automatic diaphragm lens when resolution highest；
Corresponding aperture when by the aperture adjustment of the automatic diaphragm lens being the resolution highest；
The average brightness of the image of automatic diaphragm lens acquisition when according to the resolution highest and the object brightness
Difference determine the second brightness adjustment amount, according to the second brightness adjustment amount adjust described image sensor time for exposure
And/or exposure gain, it is bright with the average brightness of the image that acquires the automatic diaphragm lens currently and the target
The difference of degree meets first prerequisite.
2. the method as described in claim 1, which is characterized in that in the average brightness of the image acquired according to automatic diaphragm lens
Before determining the first brightness adjustment amount with the difference of object brightness, the method also includes：
Judge whether the average brightness and the difference of history average brightness meet the second prerequisite, if the average brightness with
The difference of history average brightness meets second prerequisite, then the image that triggering is acquired according to automatic diaphragm lens is averaged
The difference of brightness and object brightness determines the step of the first brightness adjustment amount.
3. method according to claim 1 or 2, which is characterized in that being averaged for the image of the automatic diaphragm lens acquisition is bright
The calculation method of degree is as follows：
Wherein YavgIndicate the average brightness of image, NblockIndicate the block counts of image, YiIndicate i-th of area
The brightness of block, WiIndicate the weight coefficient of i-th of block, NpixelIndicate the sum of all pixels of image.
4. the method as described in claim 1, which is characterized in that described described automatic according to the first brightness adjustment amount adjustment
The exposure gain of the aperture of aperture camera lens and/or the time for exposure of imaging sensor and/or described image sensor specifically wraps
It includes：The time for exposure for first adjusting imaging sensor, the aperture of automatic diaphragm lens is then adjusted, finally adjusts imaging sensor
Exposure gain.
5. the method as described in claim 1, which is characterized in that different fine setting scopes corresponds to different adjustment steppings, described
The aperture that the automatic diaphragm lens are adjusted in the fine setting scope includes：
According to the hole of automatic diaphragm lens described in adjustment step by step modulating corresponding with the fine setting scope in the fine setting scope
Diameter；
The aperture for calculating the automatic diaphragm lens described in trim process automatic diaphragm lens acquisition when being different value
The resolution of image include：
According to the every aperture for adjusting the primary automatic diaphragm lens of adjustment stepping corresponding with the fine setting scope, one is just calculated
The resolution of secondary image.
6. the method as described in claim 1, which is characterized in that the solution of the image for calculating the automatic diaphragm lens acquisition
As the method for degree is as follows：
Wherein, FVtIndicate the solution picture of image
Degree, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate that vertical direction Sobel Operator, W (x, y) indicate resolution
Weight, P (x, y) indicate center pixel matrix, and the adjustment in the aperture of the automatic diaphragm lens will lead to the variation of P (x, y).
7. a kind of automatic aperture adjusting device, which is characterized in that including：
Determination unit, the average brightness of the image for being acquired according to automatic diaphragm lens and the difference of object brightness determine first
Brightness adjustment amount；
Coarse adjustment unit, aperture and/or image for adjusting the automatic diaphragm lens according to the first brightness adjustment amount pass
The time for exposure of sensor and/or the exposure gain of described image sensor, so that the figure that the automatic diaphragm lens currently acquire
The difference of the average brightness of picture and the object brightness meets the first prerequisite；
Searching unit meets the corresponding fine tuning model in aperture of automatic diaphragm lens when first prerequisite for searching
It encloses；
Fine-adjusting unit, for adjusting the aperture of the automatic diaphragm lens in the fine setting scope；
Computing unit, auto iris when being different value of the aperture for calculating the automatic diaphragm lens described in trim process
The resolution of the image of camera lens acquisition, finds out the aperture of corresponding automatic diaphragm lens when resolution highest；
The fine-adjusting unit is also used to, corresponding hole when by the aperture adjustment of the automatic diaphragm lens being the resolution highest
Diameter；
The determination unit is also used to, and the image of automatic diaphragm lens acquisition when according to the resolution highest is averaged
The difference of brightness and the object brightness determines the second brightness adjustment amount；
The fine-adjusting unit is also used to, according to the second brightness adjustment amount adjust described image sensor time for exposure and/
Or exposure gain, with the average brightness of the image that acquires the automatic diaphragm lens currently and the object brightness
Difference meets first prerequisite.
8. device as claimed in claim 7, which is characterized in that described device further includes：
Judging unit, for judging whether the average brightness and the difference of history average brightness meet the second prerequisite, if
The difference of the average brightness and history average brightness meets second prerequisite, then triggers the determination unit according to institute
The average brightness of image and the difference of object brightness for stating automatic diaphragm lens acquisition determine the first brightness adjustment amount.
9. device as claimed in claim 7 or 8, which is characterized in that the computing unit is also used to calculate the auto iris
The average brightness of the image of camera lens acquisition, specific calculation method are as follows：
Wherein YavgIndicate the average brightness of image, NblockIndicate the block counts of image, YiIndicate i-th of area
The brightness of block, WiIndicate the weight coefficient of i-th of block, NpixelIndicate the sum of all pixels of image.
10. device as claimed in claim 7, which is characterized in that the coarse adjustment unit is according to the first brightness adjustment amount tune
The exposure of the aperture of the whole automatic diaphragm lens and/or the time for exposure of imaging sensor and/or described image sensor
Gain specifically includes：The time for exposure for first adjusting imaging sensor, the aperture of automatic diaphragm lens is then adjusted, finally adjustment figure
As the exposure gain of sensor.
11. device as claimed in claim 7, which is characterized in that different fine setting scopes corresponds to different adjustment steppings；
The fine-adjusting unit is specifically used for：According to adjustment step by step modulating corresponding with the fine setting scope in the fine setting scope
The aperture of the automatic diaphragm lens；
The computing unit is specifically used for：The primary automatic light is adjusted according to adjustment stepping corresponding with the fine setting scope is every
The aperture of camera lens is enclosed, the resolution of an image is just calculated.
12. device as claimed in claim 7, which is characterized in that the computing unit calculates the method tool of the resolution of image
Body is as follows：
Wherein, FVtIndicate the solution picture of image
Degree, Osobel.xIndicate horizontal direction Sobel Operator, Osobel.yIndicate that vertical direction Sobel Operator, W (x, y) indicate resolution
Weight, P (x, y) indicate center pixel matrix, and the adjustment in the aperture of the automatic diaphragm lens will lead to the variation of P (x, y).
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| CN105979162B (en) * | 2016-07-21 | 2019-03-29 | 凌云光技术集团有限责任公司 | A kind of the automatic exposure method of adjustment and device of expansible dynamic image |
| JP6580111B2 (en) * | 2017-02-10 | 2019-09-25 | キヤノン株式会社 | Imaging device and imaging apparatus |
| CN107995436A (en) * | 2017-12-19 | 2018-05-04 | 浙江大华技术股份有限公司 | A kind of light compensation method and device |
| CN108881736B (en) * | 2018-06-30 | 2020-08-04 | 浙江大华技术股份有限公司 | Aperture correction method and device |
| CN110139042B (en) * | 2019-04-18 | 2020-08-04 | 浙江大华技术股份有限公司 | Aperture adjusting method and device, storage medium and monitoring device |
| CN110166704B (en) * | 2019-05-30 | 2021-07-13 | 深圳市道创智能创新科技有限公司 | Calibration method and device of multispectral camera |
| CN214202002U (en) * | 2020-08-03 | 2021-09-14 | 神盾股份有限公司 | Display device with fingerprint sensing function |
| CN112911177B (en) * | 2021-02-02 | 2023-02-07 | 中国电子科技集团公司第四十四研究所 | Control method for improving imaging quality of CMOS image sensor |
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| CN103888681A (en) * | 2014-04-18 | 2014-06-25 | 四川华雁信息产业股份有限公司 | Automatic exposure method and device |
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| CN101827217A (en) * | 2009-12-10 | 2010-09-08 | 浙江大华技术股份有限公司 | Self-adaptive quick setting method of auto iris driving voltage value |
| CN102135700B (en) * | 2010-01-22 | 2013-06-12 | 杭州海康威视数字技术股份有限公司 | Automatic aperture adjusting method and device |
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| CN1567081A (en) * | 2003-06-13 | 2005-01-19 | 金宝电子工业股份有限公司 | Automatic exposure method for digital cameras |
| CN103888681A (en) * | 2014-04-18 | 2014-06-25 | 四川华雁信息产业股份有限公司 | Automatic exposure method and device |
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