CN106657806B - A kind of exposure method and mobile terminal - Google Patents
A kind of exposure method and mobile terminal Download PDFInfo
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- CN106657806B CN106657806B CN201710055036.3A CN201710055036A CN106657806B CN 106657806 B CN106657806 B CN 106657806B CN 201710055036 A CN201710055036 A CN 201710055036A CN 106657806 B CN106657806 B CN 106657806B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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Abstract
The present invention provides a kind of exposure method and mobile terminals, are related to field of communication technology.The described method includes: determining initial present intensity value and initial target brightness value according to collected present frame preview image；If initial present intensity value, which is less than initial target brightness value, calculates target light exposure value according to present frame preview image；Target light exposure value is the product of target light exposure time and target sensitivity；According to target light exposure value, the first time for exposure and the first sensitivity of next frame preview image are determined；According to the first time for exposure and the first sensitivity, next frame preview image is acquired；According to next frame preview image, the first present intensity value and first object brightness value are determined；If the first present intensity value is less than first object brightness value, the first sensitivity is adjusted to target sensitivity；According to target sensitivity, target frame preview image is acquired.The present invention can meet the exposure demand of different fixed frame per second by adjusting sensitivity.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of exposure methods and mobile terminal.
Background technique
With the fast development of the communication technology, mobile terminal has been developed as the necessity in people's life.Currently, phase
Machine is as one of the standard fitting in mobile terminal, and when carrying out shooting function, a dynamic frame per second model can be arranged in camera applications
It encloses to realize automatic exposure.In order to meet requirement of the user to shooting function, fixed frame per second, example can be set in camera applications
Such as, the camera of the mobile terminals such as mobile phone, tablet computer is all to be carried out in the case where fixed frame per second using the method for automatic exposure
Exposure.
In first technology, be arranged after fixed frame per second in camera applications, exposure method can come fully according to exposure meter into
Row exposure.
In the implementation of the present invention, inventor find first technology the prior art has at least the following problems:
In first technology, after fixed frame per second is set in the camera applications in mobile terminal, the time for exposure will limit, into one
Step exposure meter just will limit sensitivity, then exposure meter just not can guarantee each fix frame per second can be normal under most of scenes
Exposure.
Summary of the invention
In order to solve exposure meter in first technology not can guarantee each fix frame per second can under most of scenes it is normal
The problem of exposure, the embodiment of the present invention provide a kind of exposure method and mobile terminal.
On the one hand, the invention discloses a kind of exposure method, the method is applied to mobile terminal, comprising:
According to collected present frame preview image, initial present intensity value and initial target brightness value are determined；
If the initial present intensity value is less than the initial target brightness value, according to the present frame preview image,
Calculate target light exposure value；The target light exposure value is the product of target light exposure time and target sensitivity；
According to the target light exposure value, the first time for exposure and the first sensitivity of next frame preview image are determined；
According to first time for exposure and the first sensitivity, the next frame preview image is acquired；
According to the next frame preview image, the first present intensity value and first object brightness value are determined；
If the first present intensity value is less than first object brightness value, first sensitivity is adjusted to the target
Sensitivity；
According to the target sensitivity, target frame preview image is acquired.
On the other hand, the invention also discloses a kind of mobile terminals, comprising:
First determining module, for according to collected present frame preview image, determining initial present intensity value and initial
Target brightness value；
Computing module is worked as according to if being less than the initial target brightness value for the initial present intensity value
Previous frame preview image calculates target light exposure value；The target light exposure value is the product of target light exposure time and target sensitivity；
Second determining module, for determining the first time for exposure of next frame preview image according to the target light exposure value
With the first sensitivity；
First acquisition module, for acquiring the next frame preview according to first time for exposure and the first sensitivity
Image；
Third determining module, for determining the first present intensity value and first object according to the next frame preview image
Brightness value；
Module is adjusted, if being less than first object brightness value for the first present intensity value, by first sensitivity
It adjusts to the target sensitivity；
Second acquisition module, for acquiring target frame preview image according to the target sensitivity.
In embodiments of the present invention, in the case where fixed frame per second, user is pre- using the camera progress image of mobile terminal
When looking at, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image, then
The target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating bat
Take the photograph environment be dark situation when, according to target light exposure value inquire exposure meter after, determine the first time for exposure of next frame preview image
The first sensitivity is improved to target sensitivity in the case where remaining unchanged the first time for exposure with the first sensitivity, thus
It can satisfy the demand of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is ok in the case where fixed frame per second
Meet the exposure demand under most of scenes by adjusting sensitivity.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the step flow chart of one of the embodiment of the present invention one exposure method；
Fig. 2 is the step flow chart of one of the embodiment of the present invention two exposure method；
Fig. 3 is the structural schematic diagram of one of the embodiment of the present invention three mobile terminal；
Fig. 4 is the structural schematic diagram of one of the embodiment of the present invention four mobile terminal；
Fig. 5 is the block diagram of one of the embodiment of the present invention five mobile terminal；
Fig. 6 is the structural schematic diagram of one of the embodiment of the present invention six mobile terminal.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
A kind of exposure method provided by the invention and movement is discussed in detail eventually below by several specific embodiments are enumerated
End.
Embodiment one
A kind of exposure method provided in an embodiment of the present invention is discussed in detail.
Referring to Fig.1, a kind of step flow chart of exposure method in the embodiment of the present invention is shown, can specifically include as follows
Step:
Step 101, according to collected present frame preview image, initial present intensity value and initial target brightness are determined
Value.
It, can be pre- in the terminal by starting camera in the mobile terminal with camera in practical application
The image of camera of looking at acquisition.
In the embodiment of the present invention, mobile terminal can determine that the present frame is pre- according to collected present frame preview image
Look at the initial present intensity value of image.Specific embodiment can be with are as follows: the present frame preview image can be divided into the area of 5*5
Domain counts the average brightness value in each region, then that is to say in the region 5*5 according to the different weights of central heavy spot light-metering
One weight coefficient is set according to each region of the average brightness value in each region to division, to calculate weighted luminance
Mean value obtains initial present intensity value.Wherein, which can also be divided into other shapes by the embodiment of the present invention
The region of formula, for example, the region of 3*3 can be divided into, the specific mode for dividing region can be set according to demand, the present invention
Embodiment does not limit it.In the embodiment of the present invention, the tool of the initial target brightness value of the present frame preview image is determined
Body embodiment can be with are as follows: in the way of from bright to dark, counts the initial present intensity histogram letter of present frame preview image
Breath, the number for then counting pixel reach corresponding brightness value when 40%, can be according to formula target_luma=
Initial target brightness value is calculated in cur_luma* (b)/a, wherein target_luma is initial target brightness value, cur_
Luma is initial present intensity value, and a is that the number of pixel in histogram reaches corresponding brightness value when 40%, and b is factory
The constant value that family debugs out.In the embodiment of the present invention, counting percentage value that the number of pixel in above-mentioned histogram reaches can
It is set with the demand according to user to the brightness that mobile terminal collects preview image, the embodiment of the present invention do not limit it
System.
Step 102, it if initial present intensity value is less than initial target brightness value, according to present frame preview image, calculates
Target light exposure value out；The target light exposure value is the product of target light exposure time and target sensitivity.
The embodiment of the present invention is primarily adapted for use in dark situation, in practical applications, present frame can be confirmed in a manner of judgement
The size of initial the present intensity value and initial target brightness value of preview image can be with when current shooting environmental is dark situation
Judge that initial present intensity value is less than the size of initial target brightness value.If initial present intensity value is less than initial target brightness
Value, then can be pre- according to the initial present intensity value and initial target brightness value of present frame preview image, and acquisition present frame
It lookes at the initial exposure time of image and target sensitivity is calculated in initial sensitivity, which refers to can satisfy
The exposure value of normal exposure is the product of target sensitivity Yu target light exposure time.Specific embodiment can be with are as follows: can basis
Target light exposure value is calculated in formula L=s0*iso0* (target_luma/cur_luma)；Wherein, L is target light exposure value, s0
For the initial exposure time of collected present frame preview image, iso0 is the initial photosensitive of collected present frame preview image
Degree, s0*iso0 are initial exposure value, that is to say the product of initial exposure time and initial sensitivity, and target_luma is acquisition
The initial target brightness value of the present frame preview image arrived, cur_luma are the initial current of collected present frame preview image
Brightness value.
It should be noted that in practical applications, when current shooting environmental is suitable, it that is to say and can satisfy normal exposure
Shooting environmental, it is initial to may determine that the initial present intensity value of present frame preview image can be equal to by way of judgement
Target brightness value, then collected present frame preview image is the preview image for meeting normal exposure.
Step 103, according to target light exposure value, the first time for exposure and the first sensitivity of next frame preview image are determined.
It should be noted that common exposure algorithm will use exposure meter to be exposed, in practical application, mobile whole
After fixed frame per second is set in end, it that is to say and limit the maximum time for exposure in exposure meter.Such as be arranged in the terminal
Fixed frame per second is 20 frames, then each frame image maximum time for exposure is 1/20 second, be that is to say in exposure meter, maximum can transport
Calculating to the time for exposure is 1/20 second.In practical application, each manufacturer is in the camera preview image effect of debugging mobile terminal, generally
It is preferentially improved in exposure meter the time for exposure, slowly improves sensitivity.For example, in exposure meter, when the time for exposure is 1/20 second,
Corresponding sensitivity can be 200.Wherein, the fixation frame per second being arranged in the terminal may be 30 frames, for anchor-frame
The size of rate can be set according to the actual situation, and the embodiment of the present invention does not limit it.
In the embodiment of the present invention, exposure value is the product of time for exposure and sensitivity, the then exposure of next frame preview image
Value is the time for exposure of next frame preview image and the product of sensitivity, that is to say that the first exposure value of next frame preview image is
First time for exposure of next frame preview image and the product of the first sensitivity, the embodiment of the present invention can be according to the targets of calculating
Exposure value, successively inquires the first time for exposure and the first sensitivity of next frame preview image in exposure meter, when the first exposure
Between and the first sensitivity be exposure meter in optimum combination.It that is to say, when shooting environmental is dark situation, inquired in exposure meter true
The closest target light exposure value of product of fixed the first time for exposure and the first sensitivity.When shooting environmental was bright, acquisition
To the initial present intensity value of present frame preview image be likely larger than initial target brightness value, then can be according to target light exposure value
Direction query in exposure meter along time for exposure reduction is photosensitive to first time for exposure equal with target light exposure value and first
The combination of degree, it can the preview graph for meeting normal exposure is collected according to the first time for exposure of inquiry and the first sensitivity
Picture.
Step 104, according to the first time for exposure and the first sensitivity, next frame preview image is acquired.
In the embodiment of the present invention, after determining the first time for exposure and the first sensitivity in exposure meter, by the first exposure
Time and the first sensitivity, which are transferred in imaging sensor, carries out data processing, then acquires next frame preview image and carries out in advance
It lookes at.
Step 105, according to next frame preview image, the first present intensity value and first object brightness value are determined.
In the embodiment of the present invention, mobile terminal can determine next frame preview according to collected next frame preview image
First present intensity value of image.Specific embodiment can be with are as follows: the next frame preview image can be divided into the area of 5*5
Domain counts the average brightness in each region, and the region 5*5 then that is to say root according to the different weights of central heavy spot light-metering
One weight coefficient is arranged to each region of division according to the average brightness value in each region, so that it is equal to calculate weighted luminance
Value obtains the first present intensity value.Wherein, which can also be divided into other forms by the embodiment of the present invention
Region, for example, the region of 3*3 can be divided into, the specific mode for dividing region can be set according to demand, and the present invention is real
Example is applied not limit it.In the embodiment of the present invention, the specific of the first object brightness value of the next frame preview image is determined
Embodiment can be with are as follows: in the way of from bright to dark, the first present intensity histogram information of next frame preview image is counted,
Then the number for counting pixel reaches corresponding brightness value when 40%, can be according to formula target_luma1=
First object brightness value is calculated in cur_luma1* (b)/a1, wherein target_luma1 is first object brightness value, cur_
Luma1 is the first present intensity value, and a1 reaches corresponding brightness value, b when 40% for the number of pixel in histogram and is
The constant value that producer debugs out.In the embodiment of the present invention, the percentage value that the number of pixel in above-mentioned histogram reaches is counted
Can the demand according to user to the brightness that mobile terminal collects preview image set, the embodiment of the present invention is not subject to it
Limitation.
Step 106, if the first present intensity value is less than first object brightness value, the first sensitivity is adjusted photosensitive to target
Degree.
In the embodiment of the present invention, when current shooting environment is dark situation, it can be determined that go out collected next frame preview
First present intensity value of image is less than first object brightness value, then adjusts the first exposure value according to the target light exposure value of calculating,
Due to limiting the maximum time for exposure in exposure meter, then adjusting the first exposure value that is to say that the first time for exposure kept not
Become, adjusts the first sensitivity value.Specifically, the first time for exposure remained unchanged, as target light exposure time, by the first sensitivity
It improves to target sensitivity.Wherein, the first sensitivity is improved the mode to target sensitivity can be with are as follows: can be in automatic exposure
The range value that a sensitivity changes is set in algorithm, the first sensitivity can be successively increased according to the range value of setting, until
Increase to equal with target sensitivity, then stops increasing.It should be noted that the range value set in automatic exposure algorithm can
To be set according to the type of the model of mobile terminal or exposure meter, the embodiment of the present invention is not limited it.
Step 107, according to target sensitivity, target frame preview image is acquired.
Target light exposure time and target sensitivity are transferred in imaging sensor and carry out data processing, then acquires target
Frame preview image carries out preview, is to meet normal expose according to target light exposure time and the collected preview image of target sensitivity
The preview image of light.
In embodiments of the present invention, in the case where fixed frame per second, user is pre- using the camera progress image of mobile terminal
When looking at, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image, then
The target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating bat
Take the photograph environment be dark situation when, according to target light exposure value inquire exposure meter after, determine the first time for exposure of next frame preview image
The first sensitivity is improved to target sensitivity in the case where remaining unchanged the first time for exposure with the first sensitivity, thus
It can satisfy the demand of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is ok in the case where fixed frame per second
Meet the exposure demand under most of scenes by adjusting sensitivity.
Embodiment two
Based on embodiment one, a kind of exposure method provided in an embodiment of the present invention is discussed in detail.
Referring to Fig. 2, a kind of exposure method flow chart of steps in the embodiment of the present invention is shown, can specifically include following step
It is rapid:
Step 201, according to collected present frame preview image, initial present intensity value and initial target brightness are determined
Value.
This step is identical as the step 101 in embodiment one, and this will not be detailed here.
Step 202, it if initial present intensity value is less than initial target brightness value, according to present frame preview image, calculates
Target light exposure value out；Target light exposure value is the product of target light exposure time and target sensitivity.
This step is identical as the step 102 in embodiment one, and this will not be detailed here.
Step 203, according to target light exposure value, the first time for exposure and the first sensitivity of next frame preview image are determined.
This step is identical as the step 103 in embodiment one, and this will not be detailed here.
Step 204, according to the first time for exposure and the first sensitivity, next frame preview image is acquired.
This step is identical as the step 104 in embodiment one, and this will not be detailed here.
Step 205, according to next frame preview image, the first present intensity value and first object brightness value are determined.
This step is identical as the step 105 in embodiment one, and this will not be detailed here.
Step 206, if the first present intensity value is less than first object brightness value, the first sensitivity is adjusted photosensitive to target
Degree.
This step is identical as the step 106 in embodiment one, and this will not be detailed here.
Step 207, judge whether target sensitivity is less than default sensitivity threshold value.
It should be noted that default sensitivity threshold value is the upper limit value of the sensitivity set in automatic exposure algorithm, when
Sensitivity is lower than this upper limit value, then the quality of collected preview image is preferable, and noise is unobvious.Wherein, setting is default
Sensitivity threshold value is generally between 1600 to 3200, and the size of the default sensitivity threshold value of setting can be according to preview image
It is required that the embodiment of the present invention does not limit it to set.In the embodiment of the present invention, judge target sensitivity with preset it is photosensitive
The mode of threshold value is spent there are two kinds as a result, the first, presets sensitivity threshold value when target sensitivity is more than or equal to, execute step
Rapid 2081, second, when target sensitivity is less than default sensitivity threshold value, execution step 2082.
Step 2081, when target sensitivity is more than or equal to default sensitivity threshold value, then target sensitivity is updated to pre-
If sensitivity threshold value, updated target sensitivity is transferred to imaging sensor；
Step 2082, sensitivity threshold value is preset when target sensitivity is less than, target sensitivity is transferred to imaging sensor.
Step 209, according to target sensitivity, target frame preview image is acquired.
This step is identical as the step 107 in embodiment one, and this will not be detailed here.
In embodiments of the present invention, in the case where fixed frame per second, user is pre- using the camera progress image of mobile terminal
When looking at, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image, then
The target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating bat
Take the photograph environment be dark situation when, according to target light exposure value inquire exposure meter after, determine the first time for exposure of next frame preview image
The first sensitivity is improved to target sensitivity in the case where remaining unchanged the first time for exposure with the first sensitivity, thus
It can satisfy the demand of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is ok in the case where fixed frame per second
Meet the exposure demand under most of scenes by adjusting sensitivity.
Embodiment three
A kind of mobile terminal provided in an embodiment of the present invention is discussed in detail.
Referring to Fig. 3, a kind of structural block diagram of mobile terminal of the embodiment of the present invention three is shown.
The mobile terminal 300 of the embodiment of the present invention includes:
The interactive relation between the function and each module of each module is described in detail below.
First determining module 301, for according to collected present frame preview image, determining initial present intensity value and just
Beginning target brightness value.
Computing module 302, if being less than initial target brightness value for initial present intensity value, according to present frame preview graph
Picture calculates target light exposure value.Target light exposure value is the product of target light exposure time and target sensitivity.Further, it calculates
Module 302 is used for: target light exposure value is calculated according to formula L=s0*iso0* (target_luma/cur_luma)；Wherein,
L is target light exposure value, and s0 is the initial exposure time of present frame preview image, and iso0 is the initial photosensitive of present frame preview image
Degree, s0*iso0 are initial exposure value, and target_luma is initial target brightness value, and cur_luma is initial present intensity value.
Second determining module 303, for according to target light exposure value, determine next frame preview image the first time for exposure and
First sensitivity.
First acquisition module 304, for acquiring next frame preview image according to the first time for exposure and the first sensitivity.
Third determining module 305, for determining that the first present intensity value and first object are bright according to next frame preview image
Angle value.
Adjust module 306, if for the first present intensity value be less than first object brightness value, by the first sensitivity adjust to
Target sensitivity.Further, adjustment module 306 is used for: the first time for exposure remained unchanged, and the first sensitivity is improved to mesh
Mark sensitivity.
Second acquisition module 307, for acquiring target frame preview image according to target sensitivity.
In embodiments of the present invention, in the case where fixed frame per second, user is pre- using the camera progress image of mobile terminal
When looking at, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image, then
The target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating bat
Take the photograph environment be dark situation when, according to target light exposure value inquire exposure meter after, determine the first time for exposure of next frame preview image
The first sensitivity is improved to target sensitivity in the case where remaining unchanged the first time for exposure with the first sensitivity, thus
It can satisfy the demand of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is ok in the case where fixed frame per second
Meet the exposure demand under most of scenes by adjusting sensitivity.
Example IV
Referring to Fig. 4, it is based on embodiment three, shows the structural block diagram of the mobile terminal of the embodiment of the present invention four.
The mobile terminal 400 of the embodiment of the present invention includes:
First determining module 401, for according to collected present frame preview image, determining initial present intensity value and just
Beginning target brightness value.
Computing module 402, if being less than initial target brightness value for initial present intensity value, according to present frame preview graph
Picture calculates target light exposure value；Target light exposure value is the product of target light exposure time and target sensitivity.Further, it calculates
Module 402 is used for: target light exposure value is calculated according to formula L=s0*iso0* (target_luma/cur_luma)；Wherein,
L is target light exposure value, and s0 is the initial exposure time of present frame preview image, and iso0 is the initial photosensitive of present frame preview image
Degree, s0*iso0 are initial exposure value, and target_luma is initial target brightness value, and cur_luma is initial present intensity value.
Second determining module 403, for according to target light exposure value, determine next frame preview image the first time for exposure and
First sensitivity.
First acquisition module 404, for acquiring next frame preview image according to the first time for exposure and the first sensitivity.
Third determining module 405, for determining that the first present intensity value and first object are bright according to next frame preview image
Angle value.
Adjust module 406, if for the first present intensity value be less than first object brightness value, by the first sensitivity adjust to
Target sensitivity.
Judgment module 407, for judging whether the target sensitivity is less than default sensitivity threshold value；
First transmission module 4081 is more than or equal to default sensitivity threshold value for working as the target sensitivity, then institute
It states target sensitivity and is updated to the default sensitivity threshold value, the updated target sensitivity is transferred to image sensing
Device.
Second transmission module 4082, for being less than default sensitivity threshold value when the target sensitivity, by the target sense
Luminosity is transferred to imaging sensor.
Second acquisition module 409, for acquiring target frame preview image according to target sensitivity.
In embodiments of the present invention, in the case where fixed frame per second, user is pre- using the camera progress image of mobile terminal
When looking at, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image, then
The target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating bat
Take the photograph environment be dark situation when, according to target light exposure value inquire exposure meter after, determine the first time for exposure of next frame preview image
The first sensitivity is improved to target sensitivity in the case where remaining unchanged the first time for exposure with the first sensitivity, thus
It can satisfy the demand of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is ok in the case where fixed frame per second
Meet the exposure demand under most of scenes by adjusting sensitivity.
Embodiment five
A kind of mobile terminal provided in an embodiment of the present invention is discussed in detail.
Referring to Fig. 5, a kind of block diagram of mobile terminal in the embodiment of the present invention is shown.
Mobile terminal 500 shown in fig. 5 includes: at least one processor 501, memory 502, at least one network interface
504, user interface 503 and camera (not shown).Various components in mobile terminal 500 are coupled in by bus system 505
Together.It is understood that bus system 505 is for realizing the connection communication between these components.It includes that data are total that bus system 505, which is removed,
It further include power bus, control bus and status signal bus in addition except line.It, will be each in Fig. 5 but for the sake of clear explanation
Kind bus is all designated as bus system 505.
Wherein, user interface 503 may include display, keyboard or pointing device (for example, mouse, trace ball
(trackball), touch-sensitive plate or touch screen etc..
It is appreciated that the memory 502 in the embodiment of the present invention can be volatile memory or nonvolatile memory,
It or may include both volatile and non-volatile memories.Wherein, nonvolatile memory can be read-only memory (Read-
Only Memory, ROM), programmable read only memory (Programmable ROM, PROM), the read-only storage of erasable programmable
Device (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or
Flash memory.Volatile memory can be random access memory (Random Access Memory, RAM), be used as external high
Speed caching.By exemplary but be not restricted explanation, the RAM of many forms is available, such as static random access memory
(Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory
(Synchronous DRAM, SDRAM), double data speed synchronous dynamic RAM (Double Data Rate
SDRAM, DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), synchronized links
Dynamic random access memory (Synchlink DRAM, SLDRAM) and direct rambus random access memory (Direct
Rambus RAM, DRRAM).The memory 502 of the system and method for description of the embodiment of the present invention is intended to include but is not limited to these
With the memory of any other suitable type.
In some embodiments, memory 502 stores following element, executable modules or data structures, or
Their subset of person or their superset: operating system 5021 and application program 5022.
In embodiments of the present invention, by the program or instruction of calling memory 502 to store, specifically, can be application
The program or instruction stored in program 5022, processor 501 are used to be determined according to the collected present frame preview image of camera
Initial present intensity value and initial target brightness value；If initial present intensity value is less than initial target brightness value, according to current
Frame preview image calculates target light exposure value；Target light exposure value is the product of target light exposure time and target sensitivity；According to mesh
Exposure value is marked, determines the first time for exposure and the first sensitivity of next frame preview image；According to the first time for exposure and first
Sensitivity acquires next frame preview image；According to next frame preview image, the first present intensity value and first object brightness are determined
Value；If the first present intensity value is less than first object brightness value, the first sensitivity is adjusted to target sensitivity；According to target sense
Luminosity acquires target frame preview image.
The method that the embodiments of the present invention disclose can be applied in processor 501, or be realized by processor 501.
Processor 501 may be a kind of IC chip, the processing capacity with signal.During realization, the above method it is each
Step can be completed by the integrated logic circuit of the hardware in processor 501 or the instruction of software form.Above-mentioned processing
Device 501 can be general processor, digital signal processor (Digital Signal Processor, DSP), dedicated integrated electricity
Road (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components.It may be implemented or execute disclosed each method, step and the logic diagram in the embodiment of the present invention.It is general
Processor can be microprocessor or the processor is also possible to any conventional processor etc..In conjunction with institute of the embodiment of the present invention
The step of disclosed method, can be embodied directly in hardware decoding processor and execute completion, or with the hardware in decoding processor
And software module combination executes completion.Software module can be located at random access memory, and flash memory, read-only memory may be programmed read-only
In the storage medium of this fields such as memory or electrically erasable programmable memory, register maturation.The storage medium is located at
The step of memory 502, processor 501 reads the information in memory 502, completes the above method in conjunction with its hardware.
It is understood that the embodiment of the present invention description these embodiments can with hardware, software, firmware, middleware,
Microcode or combinations thereof is realized.For hardware realization, processing unit be may be implemented in one or more specific integrated circuits
(Application Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal
Processing, DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable
Logic Device, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general place
It manages in device, controller, microcontroller, microprocessor, other electronic units for executing herein described function or combinations thereof.
For software implementations, can by execute the embodiment of the present invention described in function module (such as process, function etc.) come
Realize technology described in the embodiment of the present invention.Software code is storable in memory and is executed by processor.Memory can
With portion realizes in the processor or outside the processor.
Optionally, processor 501 is also used to: judging target sensitivity and default sensitivity threshold value；When target sensitivity is big
In or equal to default sensitivity threshold value, then target sensitivity is updated to default sensitivity threshold value, and updated target is photosensitive
Degree is transferred to imaging sensor；Sensitivity threshold value is preset when target sensitivity is less than, target sensitivity is transferred to image sensing
Device.
Mobile terminal 500 can be realized each process that mobile terminal is realized in previous embodiment, to avoid repeating, here
It repeats no more.
Embodiment six
Fig. 6 is the structural schematic diagram of the mobile terminal of another embodiment of the present invention.Specifically, the mobile terminal in Fig. 6
It can be mobile phone, tablet computer, personal digital assistant (Personal Digital Assistant, PDA) or vehicle-mounted computer
Deng.
Mobile terminal in Fig. 6 includes radio frequency (Radio Frequency, RF) circuit 610, memory 620, input unit
630, display unit 640, processor 660, voicefrequency circuit 670, WiFi (Wireless Fidelity) module 680, power supply 690
And camera (not shown).
Wherein, input unit 630 can be used for receiving the number or character information of user's input, and generation and mobile terminal
User setting and function control related signal input.Specifically, in the embodiment of the present invention, which can be with
Including touch panel 631.Touch panel 631, also referred to as touch screen collect the touch operation (ratio of user on it or nearby
Such as user uses the operation of finger, stylus any suitable object or attachment on touch panel 631), and according to setting in advance
Fixed formula drives corresponding attachment device.Optionally, touch panel 631 may include touch detecting apparatus and touch controller two
A part.Wherein, the touch orientation of touch detecting apparatus detection user, and touch operation bring signal is detected, signal is passed
Give touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into contact coordinate, then
The processor 660 is given, and order that processor 660 is sent can be received and executed.Furthermore, it is possible to using resistance-type, electricity
The multiple types such as appearance formula, infrared ray and surface acoustic wave realize touch panel 631.In addition to touch panel 631, input unit 630
Can also include other input equipments 632, other input equipments 632 can include but is not limited to physical keyboard, function key (such as
Volume control button, switch key etc.), trace ball, mouse, one of operating stick etc. or a variety of.
Wherein, display unit 640 can be used for showing information input by user or be supplied to the information and movement of user
The various menu interfaces of terminal.Display unit 640 may include display panel 641, optionally, can use LCD or organic light emission
The forms such as diode (Organic Light-Emitting Diode, OLED) configure display panel 641.
It should be noted that touch panel 631 can cover display panel 641, touch display screen is formed, when the touch display screen is examined
After measuring touch operation on it or nearby, processor 660 is sent to determine the type of touch event, is followed by subsequent processing device
660 provide corresponding visual output according to the type of touch event in touch display screen.
Touch display screen includes Application Program Interface viewing area and common control viewing area.The Application Program Interface viewing area
And arrangement mode of the common control viewing area does not limit, can be arranged above and below, left-right situs etc. can distinguish two it is aobvious
Show the arrangement mode in area.The Application Program Interface viewing area is displayed for the interface of application program.Each interface can be with
The interface elements such as the icon comprising at least one application program and/or widget desktop control.The Application Program Interface viewing area
Or the empty interface not comprising any content.This commonly uses control viewing area for showing the higher control of utilization rate, for example,
Application icons such as button, interface number, scroll bar, phone directory icon etc. are set.
Wherein, processor 660 is the control centre of mobile terminal, utilizes each of various interfaces and connection whole mobile phone
A part by running or execute the software program and/or module that are stored in first memory 621, and is called and is stored in
Data in second memory 622 execute the various functions and processing data of mobile terminal, to carry out to mobile terminal whole
Monitoring.Optionally, processor 660 may include one or more processing units.
In embodiments of the present invention, by call store the first memory 621 in software program and/or module and/
Or the data in the second memory 622, processor 660 are used to be determined according to the collected present frame preview image of camera
Initial present intensity value and initial target brightness value；If initial present intensity value is less than initial target brightness value, according to current
Frame preview image calculates target light exposure value；Target light exposure value is the product of target light exposure time and target sensitivity；According to mesh
Exposure value is marked, determines the first time for exposure and the first sensitivity of next frame preview image；According to the first time for exposure and first
Sensitivity acquires next frame preview image；According to next frame preview image, the first present intensity value and first object brightness are determined
Value；If the first present intensity value is less than first object brightness value, the first sensitivity is adjusted to target sensitivity；According to target sense
Luminosity acquires target frame preview image.
Optionally, as another embodiment, processor 660 is also used to: judging whether target sensitivity is less than default sense
Luminosity threshold value；When target sensitivity is more than or equal to default sensitivity threshold value, then target sensitivity is updated to default sensitivity
Updated target sensitivity is transferred to imaging sensor by threshold value；When target sensitivity is less than default sensitivity threshold value, by mesh
Mark sensitivity is transferred to imaging sensor.
Optionally, processor 660 is also used to: if the first present intensity value is exposed less than first object brightness value, first
Between remain unchanged, the first sensitivity is improved to target sensitivity.
Optionally, processor 660 is also used to: being calculated according to formula L=s0*iso0* (target_luma/cur_luma)
Obtain target light exposure value；Wherein, L is target light exposure value, and s0 is the initial exposure time of present frame preview image, and iso0 is current
The initial sensitivity of frame preview image, s0*iso0 are initial exposure value, and target_luma is initial target brightness value, cur_
Luma is initial present intensity value.
As it can be seen that in embodiments of the present invention, in the case where fixed frame per second, user carries out figure using the camera of mobile terminal
When as preview, initial present intensity value and initial target brightness value can be calculated according to collected present frame preview image,
Then the target light exposure value for meeting normal exposure is calculated further according to initial present intensity value and initial target brightness value.When locating
Shooting environmental be dark situation when, according to target light exposure value inquire exposure meter after, determine next frame preview image first exposure
Time and the first sensitivity improve the first sensitivity to target sensitivity in the case where remaining unchanged the first time for exposure,
So as to meet the needs of normal exposure.In the embodiment of the present invention, the camera of mobile terminal is in the case where fixed frame per second, all
The exposure demand under most of scenes can be met by adjusting sensitivity.
Those of ordinary skill in the art may be aware that the embodiment in conjunction with disclosed in the embodiment of the present invention describe it is each
Exemplary unit and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part or the technical solutions that contribute to first technology can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, ROM, RAM, magnetic or disk etc. are various can store program code
Medium.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. a kind of exposure method, the method is applied to mobile terminal characterized by comprising
According to collected present frame preview image, initial present intensity value and initial target brightness value are determined；
If the initial present intensity value is less than the initial target brightness value, according to the present frame preview image, calculate
Target light exposure value out；The target light exposure value is the product of target light exposure time and target sensitivity；
According to the target light exposure value, the first time for exposure and the first sensitivity of next frame preview image are determined, wherein described
First time for exposure and first sensitivity are optimum combination in exposure meter, when shooting environmental is dark situation, in the exposure
First time for exposure for determining the closest target light exposure value and first sensitivity combination are inquired in light table；When
When shooting environmental was bright, according to the target light exposure value in the exposure meter along the time for exposure reduce direction query to
The combination of the target light exposure value equal first time for exposure and first sensitivity；
According to first time for exposure and the first sensitivity, the next frame preview image is acquired；
According to the next frame preview image, the first present intensity value and first object brightness value are determined；
If the first present intensity value is less than first object brightness value, first sensitivity is adjusted photosensitive to the target
Degree；
According to the target sensitivity, target frame preview image is acquired.
2. acquisition target frame is pre- the method according to claim 1, wherein described according to the target sensitivity
Look at image the step of before, if the first present intensity value be less than first object brightness value, by first sensitivity
After the step of adjusting to the target sensitivity, further includes:
Judge whether the target sensitivity is less than default sensitivity threshold value；
When the target sensitivity is more than or equal to default sensitivity threshold value, then the target sensitivity is updated to described default
The updated target sensitivity is transferred to imaging sensor by sensitivity threshold value；
Sensitivity threshold value is preset when the target sensitivity is less than, the target sensitivity is transferred to imaging sensor.
3. if the method according to claim 1, wherein the first present intensity value is less than first object
Brightness value, the step of first sensitivity is adjusted to the target sensitivity, comprising:
If the first present intensity value is less than first object brightness value, first time for exposure remained unchanged, by described the
One sensitivity is improved to the target sensitivity.
4. calculating mesh the method according to claim 1, wherein described according to the present frame preview image
The step of marking exposure value, comprising:
The target light exposure value is calculated according to formula L=s0*iso0* (target_luma/cur_luma)；Wherein, L is
The target light exposure value, s0 are the initial exposure time of the present frame preview image, and iso0 is the present frame preview image
Initial sensitivity, s0*iso0 be initial exposure value, target_luma be the initial target brightness value, cur_luma is institute
State initial present intensity value.
5. a kind of mobile terminal characterized by comprising
First determining module, for determining initial present intensity value and initial target according to collected present frame preview image
Brightness value；
Computing module, if being less than the initial target brightness value for the initial present intensity value, according to the present frame
Preview image calculates target light exposure value；The target light exposure value is the product of target light exposure time and target sensitivity；
Second determining module, for according to the target light exposure value, determining the first time for exposure and the of next frame preview image
One sensitivity, wherein first time for exposure and first sensitivity are optimum combination in exposure meter, when shooting environmental is
When dark situation, first time for exposure for determining the closest target light exposure value and described is inquired in the exposure meter
The combination of first sensitivity；When shooting environmental was bright, according to the target light exposure value along the time for exposure in the exposure meter
Combination of the reduced direction query to first time for exposure equal with the target light exposure value and first sensitivity；
First acquisition module, for acquiring the next frame preview image according to first time for exposure and the first sensitivity；
Third determining module, for determining the first present intensity value and first object brightness according to the next frame preview image
Value；
Module is adjusted, if being less than first object brightness value for the first present intensity value, first sensitivity is adjusted
To the target sensitivity；
Second acquisition module, for acquiring target frame preview image according to the target sensitivity.
6. mobile terminal according to claim 5, which is characterized in that further include:
Judgment module, for judging whether the target sensitivity is less than default sensitivity threshold value；
First transmission module, for being more than or equal to default sensitivity threshold value, then the target sense when the target sensitivity
Luminosity is updated to the default sensitivity threshold value, and the updated target sensitivity is transferred to imaging sensor；
Second transmission module transmits the target sensitivity for being less than default sensitivity threshold value when the target sensitivity
To imaging sensor.
7. mobile terminal according to claim 5, which is characterized in that the adjustment module is used for:
If the first present intensity value is less than first object brightness value, first time for exposure remained unchanged, by described the
One sensitivity is improved to the target sensitivity.
8. mobile terminal according to claim 5, which is characterized in that the computing module is used for:
The target light exposure value is calculated according to formula L=s0*iso0* (target_luma/cur_luma)；Wherein, L is
The target light exposure value, s0 are the initial exposure time of the present frame preview image, and iso0 is the present frame preview image
Initial sensitivity, s0*iso0 be initial exposure value, target_luma be the initial target brightness value, cur_luma is institute
State initial present intensity value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108513710A (en) * | 2017-12-19 | 2018-09-07 | 深圳市大疆创新科技有限公司 | The correlating method of image and location information, device and moveable platform |
| CN108111755A (en) * | 2017-12-20 | 2018-06-01 | 广东技术师范学院 | A kind of recognition methods of picked angle of human body and device |
| CN109474790B (en) * | 2018-11-05 | 2021-06-15 | 浙江大华技术股份有限公司 | Exposure adjusting method, exposure adjusting device, camera and computer storage medium |
| CN111385484B (en) * | 2018-12-28 | 2021-06-25 | 北京字节跳动网络技术有限公司 | Information processing method and device |
| CN110708475B (en) * | 2019-11-27 | 2021-08-24 | 维沃移动通信有限公司 | Exposure parameter determination method, electronic equipment and storage medium |
| CN111917995B (en) * | 2020-06-29 | 2022-02-08 | 北京迈格威科技有限公司 | Image processing method, image processing device, electronic equipment and storage medium |
| CN112153360B (en) * | 2020-08-24 | 2022-03-18 | 青岛小鸟看看科技有限公司 | Method, device and equipment for determining exposure parameters of head-mounted equipment |
| CN112839182B (en) * | 2020-12-30 | 2022-07-15 | 上海磐启微电子有限公司 | Automatic exposure control system and method |
| CN116074634B (en) * | 2022-05-27 | 2023-11-14 | 荣耀终端有限公司 | Exposure parameter determination method and device |
| CN118075617B (en) * | 2024-04-22 | 2024-07-23 | 杭州涂鸦信息技术有限公司 | Image exposure method, device, electronic equipment and storage medium |
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