CN107343157A - A kind of exposal control method, device and computing device - Google Patents
A kind of exposal control method, device and computing device Download PDFInfo
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- CN107343157A CN107343157A CN201710560449.7A CN201710560449A CN107343157A CN 107343157 A CN107343157 A CN 107343157A CN 201710560449 A CN201710560449 A CN 201710560449A CN 107343157 A CN107343157 A CN 107343157A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
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Abstract
A kind of exposal control method, device and computing device, for any exposure key element, according to influence of the value of the exposure key element to image definition, corresponding to distinguishing there is provided each value of the exposure key element, the weighted value horizontal for characterizing image definition, therefore, when being exposed control, can be according to the span of each exposure key element, and it is each exposure key element span distinguish corresponding to proportion range, determine that exposure value is equal to and it is expected exposure value, and the optimum combination of each exposure key element value of weight sum maximum, it may be such that exposure effect meets desired image brightness, ensure that the horizontal highest of image definition, so as to improve the quality of IMAQ.
Description
Technical field
The present invention relates to acquisition technology field, more particularly to a kind of exposal control method, device and computing device.
Background technology
IMAQ, for example, taking pictures, exactly when the shutter of image collecting device is pressed, shutter closes immediately after opening
On, opened in shutter in this short time, light from camera lens transmission come in, impinge upon on photo-sensitive cell, on photo-sensitive cell count with
The color for the light that the sensitivity speck record of ten thousand meters senses, thus collects image.
Photography is exactly the art used up, it is seen then that exposes and plays most important effect for gathering the quality of image.Exposure can
Key element is exposed by time for exposure, gain etc. to be controlled.When time for exposure is sensor (photo-sensitive cell) gathered data, pixel
The time of accumulative electric charge, the time for exposure is longer, and the brightness of the image collected is bigger, but simultaneously in image because object of which movement produces
Raw smear is more serious.Gain is the multiple that the data-signal that sensor collects is exaggerated, and gain is bigger, that is, times magnification
Number is bigger, and the brightness of image is bigger, but the noise that image introduces simultaneously is also bigger.
Automatic exposure refers to brightness of the image collecting device according to photographed scene, adjust automatically time for exposure and/or gain
Deng exposure key element, to cause the brightness of image of collection to meet the process of expectation brightness.The automatic explosion method of prior art, logical
While the exposure key element regulation brightness of image such as overexposure time, gain, other negative effects, example can be produced to image effect
Such as, the motion smear of image can be increased, introduce more noises etc..Therefore, how to take into account brightness of image and image definition is certainly
The problem that dynamic exposure method is faced.
The content of the invention
The embodiments of the invention provide a kind of exposal control method, device and computing device, to solve existing exposure side
The problem of method can reduce image definition while brightness of image is lifted by adjusting exposure key element.
The embodiments of the invention provide a kind of exposal control method, methods described includes：
It is determined that detect exposure adjustment trigger action；
Present image brightness value, current exposure value and desired image brightness value are determined, by the current exposure value and institute
The ratio between the product of desired image brightness value and described present image brightness value is stated to be defined as it is expected exposure value；
According to the value model of the expectation exposure value, the span of each exposure key element got and each exposure key element
Proportion range corresponding to distinguishing is enclosed, it is determined that so that exposure value is equal to each exposure of the expectation exposure value and weight sum maximum
The optimum combination of light key element value；Wherein, exposure value determines that weight sum will equal to each exposure according to the value of each exposure key element
Element value distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, and the weighted value corresponding to value is got over
It is small, the value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；
Exposure is adjusted according to the optimum combination for each exposure key element value determined.
Correspondingly, the embodiment of the present invention additionally provides a kind of device, including：
Detection unit, for determining to detect exposure adjustment trigger action；
Computing unit, for determining present image brightness value, current exposure value and desired image brightness value, described it will work as
The ratio between product and the present image brightness value of prior exposure value and the desired image brightness value are defined as it is expected exposure value；With
And the span institute according to the expectation exposure value, the span of each exposure key element got and each exposure key element
Proportion range corresponding to respectively, it is determined that so that exposure value is equal to the expectation exposure value and each exposure of weight sum maximum will
The optimum combination of plain value；Wherein, exposure value determines according to the value of each exposure key element, and weight sum is equal to each exposure key element
Value distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller,
The value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；
Execution unit, for adjusting exposure according to the optimum combination for each exposure key element value determined.
The embodiment of the present invention additionally provides a kind of computing device, including：
Memory, instructed for storage program；
Processor, for calling the programmed instruction stored in the memory, performed according to the programmed instruction of acquisition：It is determined that
Detect exposure adjustment trigger action；And present image brightness value, current exposure value and desired image brightness value are determined,
The ratio between the product of the current exposure value and the desired image brightness value and described present image brightness value are defined as it is expected
Exposure value；And according to the value of the expectation exposure value, the span of each exposure key element got and each exposure key element
Scope distinguish corresponding to proportion range, it is determined that so that exposure value is equal to the expectation exposure value and maximum each of weight sum
Expose the optimum combination of key element value；Wherein, exposure value determines that weight sum is equal to each exposure according to the value of each exposure key element
The value of key element distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, the weighted value corresponding to value
It is smaller, the value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；Finally, according to determination
The optimum combination adjustment exposure of each exposure key element value gone out.
The present invention has the beneficial effect that：
, can be it is determined that detecting exposure the embodiments of the invention provide a kind of exposal control method, device and computing device
After adjusting trigger action, present image brightness value, current exposure value and desired image brightness value are determined, by the current exposure
The ratio between product and the present image brightness value of value and the desired image brightness value are defined as it is expected exposure value；And according to institute
State it is expected exposure value, the span of each exposure key element got and each exposure key element span distinguish corresponding to
Proportion range, it is determined that so that exposure value be equal to the expectation exposure value and the maximum each exposure key element value of weight sum most
Excellent combination；Wherein, exposure value determines according to the value of each exposure key element, and the value that weight sum is equal to each exposure key element is distinguished
The sum of corresponding weighted value；For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller, any exposure
The value of the light key element and brightness of IMAQ is proportional, definition is in inverse ratio；Finally, will according to each exposure determined
The optimum combination adjustment exposure of plain value.That is, any exposure key element is directed to, according to the value of the exposure key element to image
The influence of definition, there is provided each value of the exposure key element it is corresponding, horizontal for characterizing image definition respectively
Weighted value, therefore, can be according to the span of each exposure key element, and each exposure key element when being exposed control
Span distinguish corresponding to proportion range, determine that exposure value is equal to each exposure for it is expected that exposure value and weight sum are maximum
The optimum combination of light key element value, you can so that exposure effect meets desired image brightness, ensure that image definition level
Highest, so as to improve the quality of IMAQ.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 show the step flow chart of the exposal control method in the embodiment of the present invention one；
Fig. 2 show the structural representation of the device in the embodiment of the present invention two；
Fig. 3 show the structural representation of the computing device in the embodiment of the present invention three.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Embodiment one：
The embodiment of the present invention one provides a kind of exposal control method, and methods described is applicable to camera, video camera, video
The spectrum assignment of the equipment such as monitoring.Specifically, as shown in figure 1, it is the step flow of method described in the embodiment of the present invention one
Figure, methods described may include following steps：
Step 101：It is determined that detect exposure adjustment trigger action.
Alternatively, the determination detects exposure adjustment trigger action, may particularly include following any one or more：
Determine that the present image brightness value it is expected span beyond brightness of image；
It is determined that current stop opening it is expected span beyond the stop opening corresponding to current lens enlargement ratio；
Determine that the span of any exposure key element changes.
That is, when it is determined that present image brightness value it is expected span beyond brightness of image, this hair can be triggered
Exposal control method described in bright embodiment.It should be noted that described image brightness it is expected that span can be according to reality
Service condition is flexibly set.The present image brightness value, can be the video monitoring equipment for video monitoring equipment
The brightness value of the brightness value of the video frame image currently gathered or the video frame image collected recently apart from current time；For
For photographing device, it can be the brightness value for the photo that the photographing device currently gathers or be collected recently apart from current time
The brightness value of photo, the present embodiment are not limited in any way herein.
In addition, being directed to any image, the method that its image brightness values can use all pixels summation to be averaging again is calculated.
For example, for the image in YUV domains, after can the luminance signal Y of whole pixels value be added again divided by total pixel number, will obtain
Brightness value of the average value as the image.For another example, can be first according to brightness-formula Y=0.3R+ for the image in RGB domains
0.59G+0.11B calculates the luminance signal Y of each pixel value, then after the Y of whole value is added divided by total pixel number, will
Brightness value of the average value arrived as the image.Certainly, other methods can be also used to calculate the image brightness values of any image, this
Embodiment is not limited in any way herein.
Alternatively, when it is determined that current stop opening it is expected value beyond the stop opening corresponding to current lens enlargement ratio
During scope, the exposal control method described in the embodiment of the present invention can also be triggered.It should be noted that put for any of camera lens
Big multiplying power, a matching stop opening can be set and it is expected span.Because the enlargement ratio when camera lens is appointed to be described
During one enlargement ratio, if current stop opening it is expected span in the stop opening to match with any enlargement ratio
Within, then it may result in the problems such as introducing veiling glare, picture clarity decline；So in order to ensure the quality of IMAQ, should
This ensures that current stop opening is always at the stop opening corresponding to current lens enlargement ratio and it is expected within span.
Therefore, during camera lens zoom, however, it is determined that current stop opening is beyond corresponding to current lens enlargement ratio
When stop opening it is expected span, then adjustment is exposed；As can be seen here, the methods described that the present embodiment provides take into account
Influence of the aperture to image definition during camera lens zoom, so as to can further improve the quality of IMAQ.In addition, with appointing
The stop opening that one enlargement ratio matches it is expected that span can flexibly be set according to actual use situation, and the present embodiment is herein
It is not limited in any way.
Optionally as well, when it is determined that the span of any exposure key element changes, can also trigger of the invention real
Apply the exposal control method described in example.It should be noted that the span of any exposure key element can be according to actual use feelings
Condition is flexibly set, and when it is determined that the span of the one or more exposure key elements set changes, then re-starts exposure
Adjustment, to ensure that optimal exposure effect can be reached all the time.
Step 102：Present image brightness value, current exposure value and desired image brightness value are determined, by the current exposure
The ratio between product and the present image brightness value of light value and the desired image brightness value are defined as it is expected exposure value.
Because under the luminous environment of setting, the ratio between image brightness values and exposure value is setting value；Therefore, when current
Carve (under current luminous environment), the ratio between image brightness values and exposure value can be according to present image brightness value and current exposure
The ratio between value determines, further according to the desired image brightness value got, can determine that current time is relative with desired image brightness value
The expectation exposure value answered.
Still optionally further, the exposure key element may include：Time for exposure, gain and stop opening.When exposure key element bag
When including time for exposure, gain and stop opening, exposure value can be determined by formula (1)：
E=c1(T)+c2(G)+c3(A) formula (1)；
Wherein, E is exposure value；T is the time for exposure, T=T1, T2…TN, and Tn-1<Tn, 1<N≤N, N are just whole more than 1
Number, c1(T) it is to set transfer function for chronomere to be converted into the first of digit's decibel (dB)；G is gain, G=
G1, G2…GM, and Gm-1<Gm, 1<M≤M, M are positive integer more than 1, c2(G) it is for multiplication factor to be converted into the of decibel
Two setting transfer functions；A is stop opening, A=A1, A2…AK, and Ak-1<Ak, 1<K≤K, K are positive integer more than 1, c3(K)
For the 3rd setting transfer function for long measure to be converted to decibel.
It should be noted that the first setting transfer function c1(T), the second setting transfer function c2(G) and the 3rd setting turns
Exchange the letters number c3(K) can flexibly be chosen according to actual use situation.Because the unit of time for exposure, gain and stop opening is each not
It is identical, it is therefore preferred that chronomere, multiple and long measure can be converted to same digit's decibel, that is,
Say, by the value of the value of time for exposure, the value of gain and stop opening be respectively converted under same digit etc.
Valid value, then three equivalence values are added and obtain exposure value.
For example, it is assumed that time for exposure T minimum value is T_min, and under set scene (luminous environment), time for exposure T_min
Corresponding brightness of image is Y_min；In the case where scene, gain and stop opening are constant, time for exposure TN, corresponding figure
Image brightness is YN；So time for exposure TNCorresponding exposure value c1(TN) (dB)=20log (YN/Y_min)；Wherein, in any field
In the case of scape, gain and stop opening, Y_min corresponding to T_min, and TNCorresponding YNIt can be obtained by statistics.In addition,
The second setting transfer function c can be determined according to identical principle2(G) and the 3rd sets transfer function c3(K), the present embodiment is herein
Repeat no more.
Bring the value of the value of the time for exposure at current time, the value of gain and iris radius into formula respectively
(1) current exposure value, can be determined, the present embodiment will not be repeated here.
Step 103：According to it is described expectation exposure value, each exposure key element got span and respectively expose key element
Span distinguish corresponding to proportion range, it is determined that so that exposure value be equal to it is described expectation exposure value and weight sum most
The optimum combination of big each exposure key element value；Wherein, exposure value determines that weight sum is equal to according to the value of each exposure key element
The value of each exposure key element distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, corresponding to value
Weighted value is smaller, the value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio.
For the time for exposure, its span is T=T1, T2…TN, Tn-1<Tn, 1<N≤N, N are the positive integer more than 1.
Because the time for exposure is shorter, the brightness of the image collected is smaller, but simultaneously in image because smear caused by object of which movement is got over
Slightly；Conversely, the time for exposure is longer, the brightness of the image collected is bigger, while due to being dragged caused by object of which movement in image
Shadow is more serious.Therefore, can be set for characterizing the weight that image definition is horizontal, corresponding with the span of time for exposure
Scope is AndWith T1、With TnCorrespond；Namely
Say, the value of time for exposure is smaller, and the weighted value corresponding to the value is bigger；Conversely, the value of time for exposure is bigger, the value
Corresponding weighted value is smaller.
For gain, its span is G=G1, G2…GM, and Gm-1<Gm, 1<M≤M, M are the positive integer more than 1.By
Smaller in gain, the brightness of image is smaller, but the noise that image introduces simultaneously is also smaller；Conversely, gain is bigger, the brightness of image
It is bigger, while the noise that image introduces is also bigger.Therefore, can be set for characterize image definition it is horizontal, take with gain
The corresponding proportion range of value scope isAndWith G1、With GmCorrespond；That is, the value of gain is smaller, the weighted value corresponding to the value is bigger；Conversely, gain
Value is bigger, and the weighted value corresponding to the value is smaller.
For stop opening, its span is A=A1, A2…AK, and Ak-1<Ak, 1<K≤K, K are the positive integer more than 1.
Because stop opening is smaller, the brightness of image is smaller, but the depth of field is deeper simultaneously, and the veiling glare that image introduces is also fewer；Conversely, aperture
Aperture is bigger, and the brightness of image is bigger, while the depth of field is more shallow, and the veiling glare that image introduces is also more.Therefore, can be set for characterizing
Horizontal, corresponding with the span of the stop opening proportion range of image definition isAnd With A1、With AkCorrespond；That is, the value of stop opening is smaller, the value
Corresponding weighted value is bigger；Conversely, the value of stop opening is bigger, the weighted value corresponding to the value is smaller.
The span of any exposure key element can be by the acquiescence span that hardware is supported, or user is according to reality
The span that use demand is set.Correspondingly, with the corresponding proportion range of span of any exposure key element
Maximum and minimum value can be pre-set, and after the span of any exposure key element is set, then pass through interpolation calculation
Each median of proportion range corresponding to obtaining.
Still optionally further, it is described it is expected that exposure value, the span of each exposure key element and each exposure are wanted according to described
The span of element distinguish corresponding to proportion range, it is determined that so that exposure value it is expected exposure value and weight sum equal to described
The optimum combination of maximum each exposure key element value, may particularly include：
By time for exposure TxAnd TxCorresponding weighted valueGain GyAnd GyCorresponding weighted valueAnd aperture
Aperture AzAnd AzCorresponding weighted valueBring below equation group into, wherein, 1≤x≤N, 1≤y≤M, 1≤z≤K：
Wherein, E0For the expectation exposure value；λ is weight sum；
Determine that one or more meets E0=c1(T)+c2(G)+c3(A) and make it that λ is maximumIts
In, 1≤x0≤ N, 1≤y0≤ M, 1≤z0≤K。
That is, meeting conditions of exposure, that is, meet E0=c1(T)+c2(G)+c3(A) group of each exposure key element value
Conjunction may have multiple；Set algorithm, such as gradient descent method are based on again, are found out so that the value of each exposure key element corresponds to respectively
The maximum each exposure key element value of weighted value sum combination be each exposure key element value optimum combination, according to each exposure
The optimum combination of key element value is adjusted to exposure, then both may be such that exposure effect met desired image brightness, and ensured that
The horizontal highest of image definition.
Still optionally further, it is determined that so that exposure value is equal to each exposure of the expectation exposure value and weight sum maximum
After the optimum combination of light key element value, methods described may also include：
According to preset rules, from the optimum combination for each exposure key element value of one or more determined, one is filtered out
The optimum combination of individual optimal each exposure key element value.
For example, when methods described is applied into dynamic scene monitoring, such as road monitoring, because the time for exposure is shorter, object
Motion smear is smaller, and image effect is better, therefore, can be from the optimum combinations for each exposure key element values of one or more determined
In, the optimum combination of a time for exposure most short each exposure key element value is filtered out as optimal each exposure key element value
Optimum combination, and exposure is adjusted according to the optimum combination of each exposure key element value filtered out.
Step 104：Exposure is adjusted according to the optimum combination for each exposure key element value determined.
It can be seen that respectively exposure key element is synchronously adjusted, optimal exposure effect can be realized rapidly.Further optionally, can root
According to the optimum combination of each exposure key element value, the driving that the optimal value of each exposure key element is respectively provided to each exposure key element is electric
Lu Zhong, exposure is quickly adjusted.
Preferably, in order to avoid bounce flash, the optimum combination adjustment for each exposure key element value that the basis is determined
Exposure, may particularly include：
For each exposure key element, according to the optimal of the current value of the exposure key element and each exposure key element value
Combination, determine the difference of the optimal value of the exposure key element and the current value of the exposure key element；
Based on regular and described difference is set, the adjusting step of the exposure key element is determined；
Determine the current value of the exposure key element and the target that the adjusting step sum of the exposure key element is the exposure key element
Value；
The exposure key element is adjusted according to the target value of the exposure key element.
That is, optimum combination that can be according to each exposure key element value and each current value for exposing key element, it is determined that
The adjusting step of each exposure key element；The adjusting step of the current value of each exposure key element and each exposure key element is separately summed again,
Determine the target value of each exposure key element；And the target value of each exposure key element is respectively provided to the driving electricity of each exposure key element
Lu Zhong；Step 101 is jumped to again and judges whether that needs are exposed adjustment, therefore, may be such that brightness of image smoothly reaches the phase
Hope image brightness values.
Set it should be noted that whether the subjective feeling that can be triggered based on adjustment time or brightness change is comfortable
For calculating the setting rule of adjusting step, for example, when needing adjustment time shorter, then rule can be set and cause adjusting step
It is larger；When the subjective feeling for needing brightness change to trigger tries one's best comfortable, then rule can be set and make it that adjusting step is smaller, this reality
Example is applied to will not be repeated here.
In summary, exposal control method provided in an embodiment of the present invention, can be it is determined that detect exposure adjustment triggering behaviour
After work, present image brightness value, current exposure value and desired image brightness value are determined, by the current exposure value and the phase
The ratio between the product of image brightness values and described present image brightness value is hoped to be defined as it is expected exposure value；And it is expected to expose according to described
The span of the span of each exposure key element be worth, got and each exposure key element distinguish corresponding to proportion range,
It is determined that so that exposure value is equal to the optimum combination of the expectation exposure value and each exposure key element value of weight sum maximum；Its
In, exposure value determines according to the value of each exposure key element, and the value that weight sum is equal to each exposure key element distinguishes corresponding power
The sum of weight values；For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller, any exposure key element
The brightness of value and IMAQ is proportional, definition is in inverse ratio；Finally, according to each exposure key element value determined
Optimum combination adjustment exposure.That is, any exposure key element is directed to, according to the value of the exposure key element to image definition
Influence, there is provided each value of the exposure key element institute respectively it is corresponding, for characterize image definition level weighted value, because
This, can be according to the span of each exposure key element, and the span institute of each exposure key element when being exposed control
Proportion range corresponding to respectively, determine that exposure value is equal to each exposure key element value for it is expected exposure value and weight sum maximum
Optimum combination, you can so that exposure effect meets desired image brightness, the horizontal highest of image definition is ensured that, so as to carry
The quality of hi-vision collection.
In addition, the methods described that the present embodiment provides has considered not only influence of the aperture to exposure effect, it is also contemplated that
Influence of the aperture to image definition during camera lens zoom, so as to can further improve the quality of IMAQ.
Embodiment two：
Based on same inventive concept, the embodiment of the present invention two provides a kind of device, and described device can be camera, shooting
The equipment such as machine, video monitoring.Specifically, as shown in Fig. 2 it is the structural representation of device described in the embodiment of the present invention two,
Described device may include：
Detection unit 201, for determining to detect exposure adjustment trigger action；
Computing unit 202, for determining present image brightness value, current exposure value and desired image brightness value, by institute
The ratio between the product of current exposure value and the desired image brightness value and described present image brightness value is stated to be defined as it is expected exposure
Value；And the value model according to the expectation exposure value, the span of each exposure key element got and each exposure key element
Proportion range corresponding to distinguishing is enclosed, it is determined that so that exposure value is equal to each exposure of the expectation exposure value and weight sum maximum
The optimum combination of light key element value；Wherein, exposure value determines that weight sum will equal to each exposure according to the value of each exposure key element
Element value distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, and the weighted value corresponding to value is got over
It is small, the value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；
Execution unit 203, for adjusting exposure according to the optimum combination for each exposure key element value determined.
Alternatively, the detection unit 201 can be specifically used for determining to detect by following any one or more modes
Exposure adjustment trigger action：
Determine that the present image brightness value it is expected span beyond brightness of image；
It is determined that current stop opening it is expected span beyond the stop opening corresponding to current lens enlargement ratio；
Determine that the span of any exposure key element changes.
Alternatively, the exposure key element may include：Time for exposure, gain and stop opening.
Alternatively, when exposing key element including time for exposure, gain and stop opening, exposure value can be true in the following manner
It is fixed：
E=c1(T)+c2(G)+c3(A)；
Wherein, E is exposure value；T is the time for exposure, T=T1, T2…TN, and Tn-1<Tn, 1<N≤N, N are just whole more than 1
Number, c1(T) it is to set transfer function for chronomere to be converted into the first of digit's decibel；G is gain, G=G1,
G2…GM, and Gm-1<Gm, 1<M≤M, M are positive integer more than 1, c2(G) it is for multiplication factor to be converted into the second of decibel
Set transfer function；A is stop opening, A=A1, A2…AK, and Ak-1<Ak, 1<K≤K, K are positive integer more than 1, c3(K) it is
For long measure to be converted to the 3rd setting transfer function of decibel.
Still optionally further, the computing unit 202 can be specifically used in the following manner according to it is described expectation exposure value,
The span of the span of each exposure key element and each exposure key element distinguish corresponding to proportion range, it is determined that so that exposing
Value is equal to the optimum combination of the expectation exposure value and each exposure key element value of weight sum maximum：
By time for exposure TxAnd TxCorresponding weighted valueGain GyAnd GyCorresponding weighted valueAnd aperture
Aperture AzAnd AzCorresponding weighted valueBring below equation group into, wherein, 1≤x≤N, 1≤y≤M, 1≤z≤K：
Wherein, E0For the expectation exposure value；λ is weight sum；λTFor weight corresponding with time for exposure T-phase,AndWith T1、With TnCorrespond；λGFor with gain G phase
Corresponding weight,AndWith G1、With GmOne a pair
Should；λAFor the weight corresponding with stop opening A,AndWith
A1、With AkCorrespond；
Determine that one or more meets E0=c1(T)+c2(G)+c3(A), and make it that λ is maximumIts
In, 1≤x0≤ N, 1≤y0≤ M, 1≤z0≤K。
Alternatively, the execution unit 303, can be specifically used for being directed to each exposure key element, according to working as the exposure key element
The optimum combination of preceding value and each exposure key element value, determine the optimal value and the exposure key element of the exposure key element
The difference of current value；And based on regular and described difference is set, determine the adjusting step of the exposure key element；And determine
The current value of the exposure key element and the target value that the adjusting step sum of the exposure key element is the exposure key element；Finally, root
The exposure key element is adjusted according to the target value of the exposure key element.
In summary, device provided in an embodiment of the present invention, can it is determined that detect exposure adjustment trigger action after, it is determined that
Present image brightness value, current exposure value and desired image brightness value, the current exposure value and the desired image is bright
The ratio between the product of angle value and the present image brightness value are defined as it is expected exposure value；And according to the expectation exposure value, acquisition
The span of the span of each exposure key element arrived and each exposure key element distinguish corresponding to proportion range, it is determined that so that
Exposure value is equal to the optimum combination of the expectation exposure value and each exposure key element value of weight sum maximum；Wherein, exposure value
According to it is each exposure key element value determine, weight sum be equal to it is each exposure key element value distinguish corresponding to weighted value sum；
For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller, the value and image of any exposure key element
The brightness of collection is proportional, definition is in inverse ratio；Finally, adjusted according to the optimum combination for each exposure key element value determined
Whole exposure.That is, being directed to any exposure key element, according to influence of the value of the exposure key element to image definition, set
Each value of the exposure key element corresponding respectively, horizontal for characterizing image definition weighted value, therefore, carrying out
During spectrum assignment, it can be corresponded to respectively according to the span of each exposure key element, and the span of each exposure key element
Proportion range, determine that exposure value is equal to the optimal set for it is expected the maximum each exposure key element value of exposure value and weight sum
Close, you can so that exposure effect meets desired image brightness, ensure that the horizontal highest of image definition, adopted so as to improve image
The quality of collection.
In addition, influence of the aperture to exposure effect is considered not only, it is also contemplated that aperture pair during camera lens zoom
The influence of image definition, so as to can further improve the quality of IMAQ.
Embodiment three：
The embodiment of the present invention three provides a kind of computing device, as shown in figure 3, it is the meter described in the embodiment of the present invention
Calculate the structural representation of equipment.The computing device is specifically as follows camera, video camera, video monitoring equipment etc..Specifically, by scheming
3 understand that the computing device described in the embodiment of the present invention can include (the Center Processing of central processing unit 301
Unit, CPU), memory 302, input equipment 303 and output equipment 304 etc., input equipment 303 can include button and/or
Touch-screen etc., output equipment 304 can include display device, such as liquid crystal display (Liquid Crystal Display, LCD)
Deng.
Memory 302 can include read-only storage (ROM) and random access memory (RAM), and to central processing unit
The programmed instruction and data stored in 301 offer memories 302.In embodiments of the present invention, memory 302 can be used for storing
The program of exposal control method.
Central processing unit 301 by call memory 302 store programmed instruction, central processing unit 301 can be used for according to
The programmed instruction of acquisition performs：It is determined that detect exposure adjustment trigger action；And determine present image brightness value, current exposure
Light value and desired image brightness value, by the product of the current exposure value and the desired image brightness value and the current figure
The ratio between image brightness value is defined as it is expected exposure value；And according to the expectation exposure value, the value model of each exposure key element got
Enclose and respectively expose key element span distinguish corresponding to proportion range, it is determined that so that exposure value be equal to it is described it is expected expose
The optimum combination of each exposure key element value of value and weight sum maximum；Wherein, exposure value is true according to the value of each exposure key element
It is fixed, weight sum be equal to each exposure key element value distinguish corresponding to weighted value sum；For any exposure key element, value is got over
Greatly, the weighted value corresponding to value is smaller, the value of any exposure key element and IMAQ brightness is proportional, definition
In inverse ratio；Finally, exposure is adjusted according to the optimum combination for each exposure key element value determined.
In addition, it is necessary to explanation, any number of elements in drawing and description is used to example and unrestricted, and
Any name is only used for distinguishing, without any restrictions implication.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, apparatus (equipment) or computer journey
Sequence product.Therefore, in terms of the present invention can use complete hardware embodiment, complete software embodiment or combine software and hardware
The form of embodiment.Moreover, the present invention can use the calculating for wherein including computer usable program code in one or more
The computer program that machine usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow chart with reference to method, apparatus (equipment) and computer program product according to embodiments of the present invention
And/or block diagram describes.It should be understood that can be by each flow in computer program instructions implementation process figure and/or block diagram
And/or square frame and the flow in flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided to refer to
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is made to produce
One machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for realizing
The device for the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (13)
1. a kind of exposal control method, it is characterised in that methods described includes：
It is determined that detect exposure adjustment trigger action；
Present image brightness value, current exposure value and desired image brightness value are determined, by the current exposure value and the phase
The ratio between the product of image brightness values and described present image brightness value is hoped to be defined as it is expected exposure value；
According to the span institute of the expectation exposure value, the span of each exposure key element got and each exposure key element
Proportion range corresponding to respectively, it is determined that so that exposure value is equal to the expectation exposure value and each exposure of weight sum maximum will
The optimum combination of plain value；Wherein, exposure value determines according to the value of each exposure key element, and weight sum is equal to each exposure key element
Value distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller,
The value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；
Exposure is adjusted according to the optimum combination for each exposure key element value determined.
2. the method as described in claim 1, it is characterised in that the determination detects exposure adjustment trigger action, specific bag
Include following any one or more：
Determine that the present image brightness value it is expected span beyond brightness of image；
It is determined that current stop opening it is expected span beyond the stop opening corresponding to current lens enlargement ratio；
Determine that the span of any exposure key element changes.
3. the method as described in claim 1, it is characterised in that the exposure key element includes：Time for exposure, gain and diaphragm hole
Footpath.
4. method as claimed in claim 3, it is characterised in that when exposure key element includes time for exposure, gain and stop opening
When, exposure value determines in the following manner：
E=c1(T)+c2(G)+c3(A)；
Wherein, E is exposure value；T is the time for exposure, T=T1, T2…TN, and Tn-1<Tn, 1<N≤N, N are positive integer more than 1, c1
(T) it is to set transfer function for chronomere to be converted into the first of digit's decibel；G is gain, G=G1, G2…GM,
And Gm-1<Gm, 1<M≤M, M are positive integer more than 1, c2(G) it is to set conversion for multiplication factor to be converted into the second of decibel
Function；A is stop opening, A=A1, A2…AK, and Ak-1<Ak, 1<K≤K, K are positive integer more than 1, c3(K) it is for that will grow
Spend threeth setting transfer function of the Conversion of measurement unit for decibel.
5. method as claimed in claim 4, it is characterised in that described to be taken according to the expectation exposure value, each exposure key element
The span of value scope and each exposure key element distinguish corresponding to proportion range, it is determined that so that exposure value is equal to the expectation
The optimum combination of each exposure key element value of exposure value and weight sum maximum, is specifically included：
By time for exposure TxAnd TxCorresponding weighted value λTx, gain GyAnd GyCorresponding weighted value λGy, and stop opening Az
And AzCorresponding weighted value λAzBring below equation group into, wherein, 1≤x≤N, 1≤y≤M, 1≤z≤K：
<mrow>
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>E</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msub>
<mi>c</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>c</mi>
<mn>2</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>G</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>c</mi>
<mn>3</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<msub>
<mi>&lambda;</mi>
<mi>T</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&lambda;</mi>
<mi>G</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&lambda;</mi>
<mi>A</mi>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
<mo>,</mo>
</mrow>
Wherein, E0For the expectation exposure value；λ is weight sum；λTFor weight corresponding with time for exposure T-phase, λT=λT1,
λT2…λTN, and λTn-1>λTn, 1<N≤N, λT1With T1、λTnWith TnCorrespond；λGFor the weight corresponding with gain G, λG=λG1,
λG2…λGM, and λGm-1>λGm, 1<M≤M, λG1With G1、λGmWith GmCorrespond；λAFor the weight corresponding with stop opening A, λA
=λA1, λA2…λAK, and λAk-1>λAk, 1<K≤K, λA1With A1、λAkWith AkCorrespond；
Determine that one or more meets E0=c1(T)+c2(G)+c3(A), and make it that λ is maximumWherein, 1
≤x0≤ N, 1≤y0≤ M, 1≤z0≤K。
6. the method as described in claim 1, it is characterised in that each exposure key element value that the basis is determined is most
Excellent combination adjustment exposure, is specifically included：
For each exposure key element, according to the current value of the exposure key element and the optimal set of each exposure key element value
Close, determine the difference of the optimal value of the exposure key element and the current value of the exposure key element；
Based on regular and described difference is set, the adjusting step of the exposure key element is determined；
Determine the current value of the exposure key element and the target value that the adjusting step sum of the exposure key element is the exposure key element；
The exposure key element is adjusted according to the target value of the exposure key element.
7. a kind of device, it is characterised in that described device includes：
Detection unit, for determining to detect exposure adjustment trigger action；
Computing unit, for determining present image brightness value, current exposure value and desired image brightness value, by the current exposure
The ratio between product and the present image brightness value of light value and the desired image brightness value are defined as it is expected exposure value；And
Distinguished according to the span of the expectation exposure value, the span of each exposure key element got and each exposure key element
Corresponding proportion range, it is determined that so that exposure value is equal to the expectation exposure value and each exposure key element of weight sum maximum takes
The optimum combination of value；Wherein, exposure value determines according to the value of each exposure key element, and weight sum is equal to the value of each exposure key element
The sum of weighted value corresponding to distinguishing；For any exposure key element, value is bigger, and the weighted value corresponding to value is smaller, described
The value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；
Execution unit, for adjusting exposure according to the optimum combination for each exposure key element value determined.
8. device as claimed in claim 7, it is characterised in that the detection unit be specifically used for by it is following any one or
Multiple modes determine to detect exposure adjustment trigger action：
Determine that the present image brightness value it is expected span beyond brightness of image；
It is determined that current stop opening it is expected span beyond the stop opening corresponding to current lens enlargement ratio；
Determine that the span of any exposure key element changes.
9. device as claimed in claim 7, it is characterised in that the exposure key element includes：Time for exposure, gain and diaphragm hole
Footpath.
10. device as claimed in claim 9, it is characterised in that when exposure key element includes time for exposure, gain and stop opening
When, exposure value determines in the following manner：
E=c1(T)+c2(G)+c3(A)；
Wherein, E is exposure value；T is the time for exposure, T=T1, T2…TN, and Tn-1<Tn, 1<N≤N, N are positive integer more than 1, c1
(T) it is to set transfer function for chronomere to be converted into the first of digit's decibel；G is gain, G=G1, G2…GM,
And Gm-1<Gm, 1<M≤M, M are positive integer more than 1, c2(G) it is to set conversion for multiplication factor to be converted into the second of decibel
Function；A is stop opening, A=A1, A2…AK, and Ak-1<Ak, 1<K≤K, K are positive integer more than 1, c3(K) it is for that will grow
Spend threeth setting transfer function of the Conversion of measurement unit for decibel.
11. device as claimed in claim 10, it is characterised in that the computing unit is specifically used for basis in the following manner
The span for it is expected exposure value, the span of each exposure key element and each exposure key element distinguish corresponding to weight model
Enclose, it is determined that so that exposure value is equal to the optimum combination of the expectation exposure value and each exposure key element value of weight sum maximum：
By time for exposure TxAnd TxCorresponding weighted value λTx, gain GyAnd GyCorresponding weighted value λGy, and stop opening Az
And AzCorresponding weighted value λAzBring below equation group into, wherein, 1≤x≤N, 1≤y≤M, 1≤z≤K：
<mrow>
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>E</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msub>
<mi>c</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>c</mi>
<mn>2</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>G</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>c</mi>
<mn>3</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<msub>
<mi>&lambda;</mi>
<mi>T</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&lambda;</mi>
<mi>G</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&lambda;</mi>
<mi>A</mi>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
<mo>,</mo>
</mrow>
2
Wherein, E0For the expectation exposure value；λ is weight sum；λTFor weight corresponding with time for exposure T-phase, λT=λT1,
λT2…λTN, and λTn-1>λTn, 1<N≤N, λT1With T1、λTnWith TnCorrespond；λGFor the weight corresponding with gain G, λG=λG1,
λG2…λGM, and λGm-1>λGm, 1<M≤M, λG1With G1、λGmWith GmCorrespond；λAFor the weight corresponding with stop opening A, λA
=λA1, λA2…λAK, and λAk-1>λAk, 1<K≤K, λA1With A1、λAkWith AkCorrespond；
Determine that one or more meets E0=c1(T)+c2(G)+c3(A), and make it that λ is maximumWherein, 1
≤x0≤ N, 1≤y0≤ M, 1≤z0≤K。
12. device as claimed in claim 7, it is characterised in that the execution unit, specifically for being wanted for each exposure
Element, according to the current value of the exposure key element and the optimum combination of each exposure key element value, determine the exposure key element
The difference of optimal value and the current value of the exposure key element；And based on regular and described difference is set, determine the exposure
The adjusting step of key element；And determine that the current value of the exposure key element will for the exposure with the adjusting step sum of the exposure key element
The target value of element；Finally, the exposure key element is adjusted according to the target value of the exposure key element.
A kind of 13. computing device, it is characterised in that including：
Memory, instructed for storage program；
Processor, for calling the programmed instruction stored in the memory, performed according to the programmed instruction of acquisition：It is determined that detection
Trigger action is adjusted to exposure；And present image brightness value, current exposure value and desired image brightness value are determined, by institute
The ratio between the product of current exposure value and the desired image brightness value and described present image brightness value is stated to be defined as it is expected exposure
Value；And according to the span of the expectation exposure value, the span of each exposure key element got and each exposure key element
Proportion range corresponding to distinguishing, it is determined that so that exposure value is equal to each exposure of the expectation exposure value and weight sum maximum
The optimum combination of key element value；Wherein, exposure value determines that weight sum is equal to each exposure key element according to the value of each exposure key element
Value distinguish corresponding to weighted value sum；For any exposure key element, value is bigger, and the weighted value corresponding to value is got over
It is small, the value of any exposure key element and IMAQ brightness is proportional, definition is in inverse ratio；Finally, according to determining
Each exposure key element value optimum combination adjustment exposure.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560449.7A CN107343157A (en) | 2017-07-11 | 2017-07-11 | A kind of exposal control method, device and computing device |
| EP17887589.4A EP3545671A4 (en) | 2016-12-27 | 2017-12-17 | Systems and methods for exposure control |
| PCT/CN2017/116728 WO2018121313A1 (en) | 2016-12-27 | 2017-12-17 | Systems and methods for exposure control |
| US16/454,152 US10721409B2 (en) | 2016-12-27 | 2019-06-27 | Systems and methods for exposure control |
| US16/932,906 US11194227B2 (en) | 2016-12-27 | 2020-07-20 | Systems and methods for exposure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560449.7A CN107343157A (en) | 2017-07-11 | 2017-07-11 | A kind of exposal control method, device and computing device |
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| CN107343157A true CN107343157A (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710560449.7A Pending CN107343157A (en) | 2016-12-27 | 2017-07-11 | A kind of exposal control method, device and computing device |
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| CN (1) | CN107343157A (en) |
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| US10924684B2 (en) | 2016-10-26 | 2021-02-16 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| US11194227B2 (en) | 2016-12-27 | 2021-12-07 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| CN116723408A (en) * | 2022-02-28 | 2023-09-08 | 荣耀终端有限公司 | Exposure control method and electronic equipment |
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| CN104702851A (en) * | 2013-12-06 | 2015-06-10 | 英特尔公司 | Robust automatic exposure control using embedded data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10924684B2 (en) | 2016-10-26 | 2021-02-16 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| US11539897B2 (en) | 2016-10-26 | 2022-12-27 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| WO2018121313A1 (en) * | 2016-12-27 | 2018-07-05 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| US10721409B2 (en) | 2016-12-27 | 2020-07-21 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
| US11194227B2 (en) | 2016-12-27 | 2021-12-07 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for exposure control |
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Application publication date: 20171110 |