CN103391404A - Automatic exposure method, device, camera device and mobile terminal - Google Patents
Automatic exposure method, device, camera device and mobile terminal Download PDFInfo
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- CN103391404A CN103391404A CN2012101398924A CN201210139892A CN103391404A CN 103391404 A CN103391404 A CN 103391404A CN 2012101398924 A CN2012101398924 A CN 2012101398924A CN 201210139892 A CN201210139892 A CN 201210139892A CN 103391404 A CN103391404 A CN 103391404A
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Abstract
The invention discloses a camera automatic exposure method, a device, a camera device and a mobile terminal, and relates to the digital photographing technology. The method comprises the steps of determining the current exposure value of a camera on the basis of a camera response curve according to the brightness value of a photograph, wherein the camera response curve is a corresponding relation between the exposure value of the camera and the photograph brightness; determining the exposure compensation amount according to the current exposure value and the optimal exposure value of the camera, and determining the optimal exposure value according to the camera response curve; adjusting the camera so as to adjust the brightness of a photograph pixel according to the exposure compensation amount. On the basis of the inherent response curve of the camera, the current exposure value corresponding to the photograph brightness is obtained, the exposure compensation amount of the current exposure value and the exposure compensation amount of the optimal exposure value are obtained, the brightness of the photograph pixel is adjusted according to the exposure compensation amount, the automatic exposure adjustment is carried out on the basis of the camera inherent response curve and is not carried out on the basis of the brightness value of the taken photograph in the prior art, and the camera automatic exposure method has the advantages of being more accurate, more stable and higher in adaptability.
Description
Technical field
The present invention relates to camera technique, particularly a kind of automatic explosion method, device, camera installation and mobile terminal.
Background technology
Automatic exposure (the Auto-Exposure of digital camera, AE) function has been the necessary functions that picture signal is processed (Image Signal Processing) system, its objective is the luminance level of adjusting the picture of taking pictures, thereby reflect more realistically captured object or scene.When recording scene (object area-of-interest etc.) when brighter, AE will reduce the exposure value of camera automatically; Otherwise when recording scene (object area-of-interest etc.) when darker, AE will increase the exposure value of camera automatically.The exposure value of general camera was determined by aperture size and the time for exposure of camera.Aperture is larger, and the time for exposure is longer, and exposure value is larger, and the light-inletting quantity of camera is larger, and captured object is just brighter.Certainly, the brightness value of the digital photograph of final captured object also depends on the reflection coefficient of object itself.
At present, the automatic exposure of most of digital camera supposes that all the exposure value of camera is linear with the final lightness that forms, the brightness value that the adjustment of exposure value records based on current photo and the difference between predefined desirable brightness value, difference is larger, and the exposure value adjustment is larger.Although the adjustment of exposure value can determine by adjusting aperture or time for exposure, adjusting aperture can affect the depth of field of taking pictures.Therefore, the camera on general mobile terminal etc. is all to adopt to adjust the time for exposure and reach the purpose of adjusting exposure value.The stability problem that automatic exposure during for preview is adjusted, existing method rarely has to be mentioned.How existing method focuses mostly on measures in the brightness value of captured photo, and average brightness/intermediate value of utilizing single zone etc. is arranged, and also has mean value/intermediate value of utilizing multizone brightness/bright dark areas accounting etc. to carry out the automatic exposure compensation.
The CCD/CMOS array is very dark or there will be cut-off or saturated phenomenon when very bright, exists certain non-linear between the exposure value of camera and lightness.The time for exposure of camera is generally controlled by the built-in special register of camera, and its value can in very large range change in the integer mode, and aperture size possess different dimensions, and the normalization of exposure value is also a problem.And the relation between how to confirm normalization exposure value and lightness is a problem to be solved.In addition, how portraying lightness is also a problem, namely how the different brightness values of numerous photo pixels is represented with some overall brightness values.
Summary of the invention
The present inventor finds to have problems in above-mentioned prior art, and therefore at least one problem in described problem, has proposed a kind of new technical scheme.
An object of the present invention is to provide a kind of technical scheme for the camera automatic exposure.
According to a first aspect of the invention, provide a kind of camera automatic explosion method, having comprised: determine the current exposure value of camera based on the camera response curve according to the brightness value of photo, the camera response curve is the exposure value of camera and the corresponding relation between lightness; Determine exposure compensation amount according to the optimum exposure value of current exposure value and camera, optimum exposure value is determined according to the camera response curve; Adjust the brightness of photo pixel according to exposure compensation amount.
Alternatively, adjust camera according to exposure compensation amount and comprise with the brightness of adjusting the photo pixel: the time for exposure of adjusting camera according to exposure compensation amount makes camera reach optimum exposure value, thereby adjusts the brightness value of photo by pixel; Perhaps according to the brightness value of exposure compensation amount and each pixel of photo, determine the brightness adjustment value of each pixel of photo, thereby adjust the brightness value of photo by pixel.
Alternatively, the exposure value that represents camera with the logarithm of the exposure value of camera.
Alternatively, by the average brightness of the single area-of-interest of photo or the brightness value of middle value representation photo; Perhaps, the brightness value that represents photo by mean value, intermediate value or the bright dark areas accounting of a plurality of area-of-interests of photo.
Alternatively, comprise many camera response curves corresponding with the aperture-coefficient of camera respectively, and with every optimum exposure value that the camera response curve is corresponding; Determine that based on the camera response curve the current exposure value of camera comprises according to the brightness value of photo: determine the current aperture parameters of camera and the current camera response curve corresponding with current aperture parameters; Determine the current exposure value of camera based on current camera response curve according to the brightness value of photo; Determine that according to the optimum exposure value of current exposure value and camera exposure compensation amount comprises: according to current exposure value and the optimum exposure value corresponding with current camera response curve, determine exposure compensation amount; Adjusting camera according to exposure compensation amount comprises with the brightness of adjusting the photo pixel: adjust the time for exposure of camera according to exposure compensation amount to adjust the brightness of photo pixel.
Alternatively, the method also comprises the step of demarcating based on the camera response curve: shine by uniform source of light the test panel that comprises many different transmission coefficient stripeds and obtain the corresponding relation of exposure value and brightness; Corresponding relation match camera response curve based on exposure value and brightness; Determine the optimum exposure value of camera according to the camera response curve.
Alternatively, optimum exposure value is the minimum exposure value in the time of all seeing all stripeds clearly.
Alternatively, the method also comprises: obtain the exposure compensation amount between the exposure value of current exposure value and previous multiframe preview when preview; Adjust exposure when exposure compensation amount surpasses predetermined threshold, otherwise exposure remains unchanged.
According to a further aspect in the invention, a kind of automatic exposure device is provided, comprise: current exposure value determining unit, be used for determining the current exposure value of camera based on the camera response curve according to the brightness value of photo, the camera response curve is the exposure value of camera and the corresponding relation between lightness; The exposure compensation amount determining unit is used for determining exposure compensation amount according to the optimum exposure value of current exposure value and camera that optimum exposure value is determined according to the camera response curve; The pixel intensity adjustment unit, be used for adjusting according to exposure compensation amount the brightness of photo pixel.
Alternatively, the time for exposure that the pixel intensity adjustment unit is adjusted camera according to exposure compensation amount makes camera reach optimum exposure value, thereby adjusts the brightness value of photo by pixel; Perhaps according to the brightness value of exposure compensation amount and each pixel of photo, determine the brightness adjustment value of each pixel of photo, thereby adjust the brightness value of photo by pixel.
Alternatively, the exposure value that represents camera with the logarithm of the exposure value of camera; Or/and by the average brightness of the single area-of-interest of photo or the brightness value of middle value representation photo; Perhaps, the brightness value that represents photo by mean value, intermediate value or the bright dark areas accounting of a plurality of area-of-interests of photo.
Alternatively, comprise many camera response curves corresponding with the aperture-coefficient of camera respectively, and with every optimum exposure value that the camera response curve is corresponding; Device also comprises: the aperture parameters determining unit, and for the current aperture parameters of determining camera, and the current camera response curve corresponding with current aperture parameters; The current camera response curve that current exposure value determining unit is determined based on the aperture determining unit according to the brightness value of photo is determined the current exposure value of camera; The exposure compensation amount determining unit is determined exposure compensation amount according to current exposure value and the optimum exposure value corresponding with current camera response curve; The pixel intensity adjustment unit is adjusted the time for exposure of camera to adjust the brightness of photo pixel according to exposure compensation amount.
Alternatively, this device also comprises: response curve is demarcated unit, is used for carrying out match camera response curve based on the exposure value that shines the test panel acquisition that comprises many different transmission coefficient stripeds by uniform source of light and the corresponding relation of brightness.
Alternatively, optimum exposure value is the minimum exposure value in the time of all seeing all stripeds clearly.
Alternatively, this device also comprises: preview exposure control unit, the exposure compensation amount between the exposure value that obtains current exposure value and previous multiframe preview when preview, adjust exposure when exposure compensation amount surpasses predetermined threshold, otherwise exposure remains unchanged.
According to another aspect of the invention, also provide camera installation and the mobile terminal that comprises above-mentioned automatic exposure device.
An advantage of the present invention is, the response curve intrinsic take camera carries out the adjustment of camera automatic exposure as basis, have more accurate, stable advantage.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, it is clear that further feature of the present invention and advantage thereof will become.
Description of drawings
The accompanying drawing that forms the part of specification has been described embodiments of the invention, and is used for explaining principle of the present invention together with the description.
With reference to accompanying drawing,, according to following detailed description, can more be expressly understood the present invention, wherein:
Fig. 1 illustrates the flow chart of an embodiment of camera exposure method of the present invention;
Fig. 2 illustrates the flow chart of another embodiment of camera exposure method of the present invention;
Fig. 3 illustrates the example that a camera response curve of the present invention is demarcated;
Fig. 4 illustrates the diagram of the example of camera response curve and optimum exposure value;
Fig. 5 A illustrates the diagram of the example of single center automatic exposure area-of-interest;
Fig. 5 B illustrates the diagram of the example of many automatic exposure area-of-interest;
Fig. 6 illustrates the flow chart of another embodiment of camera exposure method of the present invention;
When Fig. 7 illustrates preview of the present invention, flow chart is stablized in automatic exposure;
Fig. 8 illustrates the structure chart of an embodiment of automatic exposure device of the present invention;
Fig. 9 illustrates the structure chart of another embodiment of automatic exposure device of the present invention;
Figure 10 goes out the structure chart of another embodiment of automatic exposure device of the present invention.
Embodiment
Describe various exemplary embodiment of the present invention in detail now with reference to accompanying drawing.It should be noted that: unless illustrate in addition, the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step do not limit the scope of the invention.
Simultaneously, should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to the proportionate relationship of reality.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the present invention and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in suitable situation, described technology, method and apparatus should be regarded as authorizing the part of specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore,, in case be defined in an a certain Xiang Zaiyi accompanying drawing, do not need it is further discussed in accompanying drawing subsequently.
Fig. 1 illustrates the flow chart of an embodiment of camera exposure method of the present invention.
As shown in Figure 1, step 102, determine the current exposure value of camera according to the brightness value of photo based on the camera response curve, and the camera response curve represents the exposure value of camera and the corresponding relation between lightness.The camera response curve can be demarcated by experiment or be fixed at the rower that advances of dispatching from the factory by producer, the intrinsic characteristic of expression camera.The brightness value of photo is mapped on the camera response curve, and the exposure value that mapping point is corresponding is current exposure value.
In above-described embodiment, the response curve intrinsic take camera obtains current exposure value corresponding to lightness as basis, obtain the exposure compensation amount of current exposure value and optimum exposure value, adjust the brightness of camera with the photo pixel according to exposure compensation amount, its adjustment is carried out based on the intrinsic response curve of camera, rather than in prior art, the brightness value based on captured photo is adjusted automatic exposure, have advantages of more accurate, more stable, adaptability is stronger.
Fig. 2 illustrates the flow chart of another embodiment of camera exposure method of the present invention.In this embodiment, camera response curve and optimum exposure value are demarcated by experiment.
As shown in Figure 2, step 202, the camera response curve that calibration for cameras is intrinsic.Introduce an example of calibration for cameras response curve by experiment in connection with Fig. 3 after a while.
Introduce an example of calibration for cameras response curve by experiment below in conjunction with Fig. 3.
As shown in Figure 3, step 302, generate test panel.Test panel is comprised of many stripeds with different transmission coefficients, and it comprises from the darkest to the most various transmission coefficient stripeds of bright scope.
Usually the dimension difference of aperture size and camera exposure time, by 32 integer discrete representations, cause the exposure value scope larger.Can adopt the logarithm of exposure value to represent exposure value, namely the camera response curve is expressed as the corresponding relation of exposure value logarithm and brightness value.Optimum exposure value is also corresponding to the logarithm of actual optimum exposure value.This expression mode has also played certain inhibitory action for insensitive overexposure zone.
For demarcation and the optimum exposure value of camera response curve as shown in Figure 4,, for a collection of camera sensor, can only need do once,, by image data, be aided with the automation curve approximate algorithm and complete, other links can all be completed automatically.
In above-described embodiment, by the intrinsic response curve of calibration for cameras, thus the optimum exposure value of definite camera, optimum exposure value is demarcated acquisition by experiment, the intrinsic optimum exposure setting of reflection camera.
, except by adjusting the time for exposure, adjusting exposure value, can also adjust exposure value by adjusting aperture and time for exposure.In one embodiment,, for different aperture parameters values, adjust the time for exposure according to the mode of Fig. 3 embodiment respectively, thereby obtain the camera response curve under different aperture parameters values, and the optimum exposure value under this aperture parameters.In another embodiment, adjust respectively aperture parameters and time for exposure, thereby obtain the corresponding relation of exposure value and brightness value, match obtains the camera response curve, and optimum exposure value.
The brightness value of current photo can obtain by single or a plurality of area-of-interests.Fig. 5 A illustrates the diagram of the example of single center automatic exposure area-of-interest.Brightness value in each area-of-interest can be the mean value of all pixel intensity in this zone, also can use any other method representation, as intermediate value etc.Area-of-interest in reality can also have other form, and the weight of different area-of-interests can self-definedly arrange.Fig. 5 B illustrates the diagram of the example of many automatic exposure area-of-interest, as shown in Figure 5 B,, except center automatic exposure area-of-interest, also comprises a plurality of auxiliary AE area-of-interests.For the situation of many area-of-interests, a kind of method that judges whether that fast overexposure still owes to expose to the sun is the accounting of special Liang Te dark space piece in Zone Full, and bright dark space piece accounting can be thought and need the automatic exposure compensation over 50%.When calculating the multizone brightness value, the weight of Kuai He center, special bright dark space block can be set greater than other blocks.
Fig. 6 illustrates the flow chart of another embodiment of camera exposure method of the present invention.In this embodiment, corresponding to different aperture parameters demarcation camera response curves separately, and corresponding optimum exposure value.
As shown in Figure 6, step 602, demarcate the camera response curve under different aperture parameters.
In above-described embodiment, for different aperture parameters, demarcate different camera response curves, can reflect more accurately the characteristic that camera is intrinsic, make that adjustment is more accurate, more stable, adaptability is stronger.
Camera is when preview (Preview), and automatic exposure also must meet certain stability, otherwise there will be strange jitter phenomenon.When Fig. 7 illustrates preview of the present invention, flow chart is stablized in automatic exposure.
As shown in Figure 7, step 702, for example obtain the previous exposure value of previous frame or multiformat film from register.
Stability is adjusted in automatic exposure during for continuous preview, and its flow process as shown in Figure 7,, if the difference of the exposure value of the exposure value of current photo and a upper photo is excessive, while surpassing predetermined threshold, is adjusted exposure; Otherwise exposure remains unchanged, and preview sequence like this will be more stable.Certainly, here also can be according to the difference of exposure value, progressive adjustment exposure, can not give the people sensation that a kind of formula exposure that suddenlys change is adjusted, the automatic exposure stability while guaranteeing preview yet.And, can also according to before the difference of exposure value of exposure value (as serial mean) and current photo of a sequence photo decide exposure stability to control.
Fig. 8 illustrates the structure chart of an embodiment of automatic exposure device of the present invention.As shown in Figure 8, this device comprises: current exposure value determining unit 81, determine the current exposure value of camera based on the camera response curve according to the brightness value of photo, and the camera response curve is the exposure value of camera and the corresponding relation between lightness; Exposure compensation amount determining unit 82, determine exposure compensation amount according to the optimum exposure value of current exposure value and camera, and optimum exposure value is determined according to the camera response curve; Pixel intensity adjustment unit 83, adjust the brightness of photo pixel according to exposure compensation amount.For example, the time for exposure that pixel intensity adjustment unit 83 is adjusted camera according to exposure compensation amount makes camera reach optimum exposure value, thereby adjusts the brightness value of photo by pixel; Perhaps, determine the brightness adjustment value of each pixel of photo according to the brightness value of exposure compensation amount and each pixel of photo, thereby adjust the brightness value of photo by pixel.In one embodiment, the exposure value that represents camera with the logarithm of the exposure value of camera.Can be by the average brightness of the single area-of-interest of photo or the brightness value of middle value representation photo; Perhaps, the brightness value that represents photo by mean value, intermediate value or the bright dark areas accounting of a plurality of area-of-interests of photo.
In one embodiment, comprise many camera response curves corresponding with the aperture-coefficient of described camera respectively, and with every optimum exposure value that the camera response curve is corresponding.Fig. 9 illustrates the structure chart of another embodiment of automatic exposure device of the present invention.As shown in Figure 9, this automatic exposure device comprises: aperture parameters determining unit 90, determine the current aperture parameters of camera and the current camera response curve corresponding with current aperture parameters; Current exposure value determining unit 91, determine the current exposure value of camera according to the brightness value of photo based on the definite current camera response curve of aperture determining unit; Exposure compensation amount determining unit 92, determine exposure compensation amount according to current exposure value and the optimum exposure value corresponding with current camera response curve; Pixel intensity adjustment unit 93, adjust the time for exposure of camera to adjust the brightness of photo pixel according to exposure compensation amount.
Figure 10 goes out the structure chart of another embodiment of automatic exposure device of the present invention.As shown in figure 10, this automatic exposure device comprises response curve demarcation unit 101, current exposure value determining unit 81, exposure compensation amount determining unit 82 and pixel intensity adjustment unit 83.Current exposure value determining unit 81, exposure compensation amount determining unit 82 and pixel intensity adjustment unit 83 can be described referring to the correspondence of above-described embodiment, for being not described in detail at this for purpose of brevity.Response curve is demarcated unit 101, based on the exposure value that shines the test panel acquisition that comprises many different transmission coefficient stripeds by uniform source of light and the corresponding relation of brightness, carrys out the described camera response curve of match.
In one embodiment, automatic exposure device also comprises: preview exposure control unit 102, and, for the exposure compensation amount between the exposure value that obtains current exposure value and previous multiframe preview when preview, when surpassing predetermined threshold, exposure compensation amount adjusts exposure, otherwise exposure remains unchanged.
It will be understood by those of skill in the art that above-mentioned automatic exposure device can be included in camera installation, in camera, perhaps be included in the mobile terminal with camera function.
Existing camera automatic exposure compensation method, accuracy and flexibility are not good enough, no matter the difference of the imageing sensor of taking pictures (as non-linear/optimum exposure value etc.), all based on lightness value indirectly as according to adjusting automatic exposure, the lightness value be subject to camera non-linear/reflection coefficient of different reference objects impact on an equal basis, the just a kind of not accurate enough secondary indication of exposure value.In addition, the exposure stability problem of the sequence of pictures during for preview, it is few that existing method is considered.
The disclosure proposed a kind of that be simple and easy to realize, take automatic exposure compensation method and the device of the intrinsic response curve of camera as basis.Demarcate in advance and interpolation goes out actual corresponding curve between exposure value logarithm and lightness, carry out accordingly the automatic exposure of camera.Lightness can be the average brightness/intermediate value in single zone etc., can be also the mean value/intermediate value/bright dark areas accounting etc. of multizone brightness.Optimum exposure value is also that chamber is demarcated and obtained by experiment, reflection be the intrinsic optimum exposure setting of camera.Exposure value adjustment during for preview, introduced certain magnetic hysteresis, namely only has when estimated exposure value double or repeatedly previewing photos during greater than certain value, just carries out automatic exposure and process; Otherwise, do not carry out any operation.In each embodiment, exposure is adjusted and all to be based on the intrinsic response curve of camera and to carry out, rather than traditional brightness value based on captured photo adjusts automatic exposure, has the characteristics more accurate, more stable, that adaptability is stronger.
So far, described in detail according to camera automatic explosion method of the present invention, device and camera installation.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to top description, can understand how to implement technical scheme disclosed herein fully.
May realize in many ways method of the present invention, device and camera installation.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of described method is only in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specify.In addition, in certain embodiments, can be also the program that is recorded in recording medium with the invention process, these programs comprise be used to the machine readable instructions that realizes the method according to this invention.Thereby the present invention also covers storage and is used for the recording medium of the program of execution the method according to this invention.
Although by example, specific embodiments more of the present invention are had been described in detail, it should be appreciated by those skilled in the art, above example is only in order to describe, rather than in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (17)
1. a camera automatic explosion method, is characterized in that, comprising:
Determine the current exposure value of camera based on the camera response curve according to the brightness value of photo, described camera response curve is the exposure value of camera and the corresponding relation between lightness;
Determine exposure compensation amount according to the optimum exposure value of described current exposure value and camera, described optimum exposure value is determined according to described camera response curve;
Adjust the brightness of photo pixel according to described exposure compensation amount.
2. method according to claim 1, is characterized in that, described brightness according to described exposure compensation amount adjustment photo pixel comprises:
The time for exposure of adjusting described camera according to described exposure compensation amount makes described camera reach optimum exposure value, thereby adjusts the brightness value of photo by pixel;
Perhaps,
Described brightness according to described exposure compensation amount adjustment photo pixel comprises:
Determine the brightness adjustment value of each pixel of photo according to the brightness value of described exposure compensation amount and each pixel of photo, thereby adjust the brightness value of photo by pixel.
3. method according to claim 1, is characterized in that, represents the exposure value of described camera with the logarithm of the exposure value of described camera.
4. method according to claim 1, is characterized in that, by the average brightness of the single area-of-interest of photo or the brightness value of the described photo of middle value representation;
Perhaps,
The brightness value that represents described photo by mean value, intermediate value or the bright dark areas accounting of a plurality of area-of-interests of described photo.
5. method according to claim 1, is characterized in that, comprises many camera response curves corresponding with the aperture-coefficient of described camera respectively, and with every optimum exposure value that the camera response curve is corresponding;
Described brightness value according to photo determines that based on described camera response curve the current exposure value of camera comprises:
Determine current aperture parameters and the current camera response curve corresponding with described current aperture parameters of described camera;
Determine the current exposure value of camera based on described current camera response curve according to the brightness value of photo;
Described optimum exposure value according to described current exposure value and camera determines that exposure compensation amount comprises:
Determine exposure compensation amount according to described current exposure value and the optimum exposure value corresponding with described current camera response curve;
It is described that brightness with adjustment photo pixel comprises according to the described camera of described exposure compensation amount adjustment:
Adjust the time for exposure of described camera according to described exposure compensation amount to adjust the brightness of photo pixel.
6. method according to claim 1, is characterized in that, also comprises and demarcate described step based on the camera response curve:
Shine by uniform source of light the test panel that comprises many different transmission coefficient stripeds and obtain the corresponding relation of exposure value and brightness;
Based on the described camera response curve of the corresponding relation match of described exposure value and brightness;
Determine the optimum exposure value of camera according to described camera response curve.
7. method according to claim 6, is characterized in that, described optimum exposure value is the minimum exposure value in the time of all seeing all stripeds clearly.
8. method according to claim 1, is characterized in that, also comprises when preview:
Obtain the exposure compensation amount between the exposure value of current exposure value and previous multiframe preview;
Adjust exposure when described exposure compensation amount surpasses predetermined threshold, otherwise exposure remains unchanged.
9. an automatic exposure device, is characterized in that, comprising:
Current exposure value determining unit is used for determining the current exposure value of camera based on the camera response curve according to the brightness value of photo that described camera response curve is the exposure value of camera and the corresponding relation between lightness;
The exposure compensation amount determining unit is used for determining exposure compensation amount according to the optimum exposure value of described current exposure value and camera that described optimum exposure value is determined according to described camera response curve;
The pixel intensity adjustment unit, be used for adjusting according to described exposure compensation amount the brightness of photo pixel.
10. device according to claim 9, is characterized in that, the time for exposure that described pixel intensity adjustment unit is adjusted described camera according to described exposure compensation amount makes described camera reach optimum exposure value, thereby adjust the brightness value of photo by pixel; Perhaps described pixel intensity adjustment unit is determined the brightness adjustment value of each pixel of photo according to the brightness value of described exposure compensation amount and each pixel of photo, thereby adjusts the brightness value of photo by pixel.
11. device according to claim 9, is characterized in that, represents the exposure value of described camera with the logarithm of the exposure value of described camera;
Or/and
By the average brightness of the single area-of-interest of photo or the brightness value of the described photo of middle value representation;
Perhaps,
The brightness value that represents described photo by mean value, intermediate value or the bright dark areas accounting of a plurality of area-of-interests of described photo.
12. device according to claim 9, is characterized in that, comprises many camera response curves corresponding with the aperture-coefficient of described camera respectively, and with every optimum exposure value that the camera response curve is corresponding;
Described device also comprises:
The aperture parameters determining unit, for the current aperture parameters of determining described camera, and the current camera response curve corresponding with described current aperture parameters;
The current camera response curve that described current exposure value determining unit is determined based on described aperture determining unit according to the brightness value of photo is determined the current exposure value of camera;
Described exposure compensation amount determining unit is determined exposure compensation amount according to described current exposure value and the optimum exposure value corresponding with described current camera response curve;
Described pixel intensity adjustment unit is adjusted the time for exposure of described camera to adjust the brightness of photo pixel according to described exposure compensation amount.
13. device according to claim 9, is characterized in that, also comprises:
Response curve is demarcated unit, is used for carrying out the described camera response curve of match based on the exposure value that shines the test panel acquisition that comprises many different transmission coefficient stripeds by uniform source of light and the corresponding relation of brightness.
14. device according to claim 13, is characterized in that, described optimum exposure value is the minimum exposure value in the time of all seeing all stripeds clearly.
15. device according to claim 9, is characterized in that, also comprises:
Preview exposure control unit, the exposure compensation amount between the exposure value that obtains current exposure value and previous multiframe preview when preview, adjust exposure when described exposure compensation amount surpasses predetermined threshold, otherwise exposure remains unchanged.
16. a camera installation, comprise the described automatic exposure device of any one in claim 9 to 15.
17. a mobile terminal, comprise the described camera installation of claim 16.
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