CN107172364A

CN107172364A - A kind of image exposure compensation method, device and computer-readable recording medium

Info

Publication number: CN107172364A
Application number: CN201710296745.0A
Authority: CN
Inventors: 王君地
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2017-04-28
Filing date: 2017-04-28
Publication date: 2017-09-15
Anticipated expiration: 2037-04-28
Also published as: CN107172364B

Abstract

The invention discloses a kind of image exposure compensation method, device and computer-readable recording medium, according to the pixel distribution feature of shooting preview image, shooting preview image can be divided into multiple exposure compensating subregions in image shoot process；According to the pixel distribution feature of each exposure compensating subregion, exposure compensating parameter corresponding with each exposure compensating subregion is obtained；According to exposure compensating parameter corresponding with exposure compensating subregion, compensation is exposed to exposure compensating parameter respectively.Relative to image overall exposure compensating of the prior art, the present invention has carried out exposure compensating sub-zone dividing according to the pixel distribution feature of image to image, each sub-regions are respectively arranged with corresponding exposure compensating parameter, so each exposure compensating subregion can obtain suitable different degrees of exposure compensating, effectively reduce overexposure and owe to expose existing possibility, strengthen the profile and third dimension of image, improve the image quality of image, improve the shooting experience of user.

Description

A kind of image exposure compensation method, device and computer-readable recording medium

Technical field

The present invention relates to technique for taking field, more particularly to a kind of image exposure compensation method, device and computer-readable Storage medium.

Background technology

Exposure compensating is also referred to as EV (exposure value) adjustment, refers to that the illumination to shooting environmental in image shoot process is not enough And a kind of image enhancement technique taken.Traditional exposure compensating is to strengthen the brightness and contrast of global image, i.e., for one For individual image, exposure compensating refers to entering all subject (including shooting background) in image using same exposure intensity Row exposure.

Traditional exposure compensating does not account for demand of the different zones for different exposure intensities of image, using tradition Exposure compensating the problem of easily allow the image to produce local overexposure or owe to expose, make picture quality entire lowering.So prior art In, lack it is a kind of in shooting process, can be according to the actual conditions of preview image, and the different zones to preview image are used Different exposure intensities are exposed the scheme of compensation.

The content of the invention

It is a primary object of the present invention to propose a kind of image exposure compensation method, device and computer-readable storage medium Matter, it is intended to which solution easily allows image to produce the problem of local overexposure or deficient exposure using exposure compensating in the prior art.

To achieve the above object, the present invention provides a kind of image exposure compensation method, including：

In image shoot process, according to the pixel distribution feature of shooting preview image, shooting preview image is divided into Multiple exposure compensating subregions；

According to the pixel distribution feature of each exposure compensating subregion, expose corresponding with each exposure compensating subregion is obtained Light compensating parameter；

According to exposure compensating parameter corresponding with each exposure compensating subregion, exposure compensating subregion is exposed respectively Light is compensated.

Further, according to the pixel distribution feature of shooting preview image, shooting preview image is divided into multiple exposures Compensation subregion includes：

According to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into multiple brightness related The different exposure compensating subregion of characteristic, brightness correlation properties include brightness and/or brightness change speed.

Further, according to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into many The different exposure compensating subregion of individual brightness correlation properties includes：

It is pre- by shooting according to luminance component and default Luminance Analysis model to shooting preview image zooming-out luminance component Image of looking at is divided into the exposure compensating subregion of multiple different brightness degrees；

Or, rim detection is carried out to shooting preview image and determines subject fringe region in shooting preview image and non- Subject fringe region, the exposure compensating sub-district that subject fringe region and non-shooting thing fringe region are set into two is different Domain；

Or, to shooting preview image zooming-out luminance component, according to luminance component and default Luminance Analysis model, it will clap Take the photograph the exposure compensating subregion that preview image is divided into multiple different brightness degrees；Rim detection is carried out to shooting preview image true Determine the subject fringe region in shooting preview image, subject fringe region is set to exposure compensating subregion；Wherein, it is right When subject fringe region is exposed compensation benefit is exposed only according to the corresponding exposure compensating parameter of subject fringe region Repay.

The distribution of color in shooting preview image is determined, shooting preview image is divided into by multiple exposures according to the distribution of color Light compensates subregion；What is included in exposure compensating subregion is the close color lump of color.

Further, obtaining exposure compensating parameter corresponding with each exposure compensating subregion includes：

The exposure compensating parameter for being adapted to each exposure compensating subregion is chosen from default exposure compensating parameter；

Or, each exposure compensating subregion is set in real time according to the characteristics of the Luminance Distribution of each exposure compensating subregion Corresponding exposure compensating parameter.

To achieve the above object, the present invention also provides a kind of image exposure compensation device, the image exposure compensation device bag Include processor, memory and communication bus；

Communication bus is used to realize the connection communication between processor and memory；

Processor is used to perform the image exposure compensation program stored in memory, to realize following steps：

Further, processor is used to perform image exposure compensation program, to realize following steps：

Or, for determining the subject fringe region in shooting preview image to shooting preview image progress rim detection With non-shooting thing fringe region, the exposure compensating that subject fringe region and non-shooting thing fringe region are set into two is different Subregion；

Or, for shooting preview image zooming-out luminance component, according to luminance component and default Luminance Analysis model, Shooting preview image is divided into the exposure compensating subregion of multiple different brightness degrees；Edge inspection is carried out to shooting preview image The subject fringe region determined in shooting preview image is surveyed, subject fringe region is set to exposure compensating subregion；Its In, exposed when being exposed compensation to subject fringe region only according to the corresponding exposure compensating parameter of subject fringe region Light is compensated.

To achieve the above object, the present invention also provides a kind of computer-readable recording medium, the computer-readable storage medium Matter is stored with one or more program, and one or more program can be performed, to realize following steps：

Image exposure compensation method, device and the computer-readable recording medium proposed using the present embodiment, can be in figure As in shooting process, according to the pixel distribution feature of shooting preview image, shooting preview image is divided into multiple exposure compensatings Subregion；According to the pixel distribution feature of each exposure compensating subregion, expose corresponding with each exposure compensating subregion is obtained Light compensating parameter；According to exposure compensating parameter corresponding with exposure compensating subregion, exposure compensating parameter is exposed respectively Compensation.Relative to image overall exposure compensating of the prior art, the present invention enters according to the pixel distribution feature of image to image Exposure compensating sub-zone dividing is gone, each sub-regions are respectively arranged with corresponding exposure compensating parameter, so each exposure is mended Suitable different degrees of exposure compensating can be obtained by repaying subregion, reduced overexposure and owed to expose existing possibility, improve image Image quality, improve user shooting experience.

Brief description of the drawings

Fig. 1 is the hardware architecture diagram for the mobile terminal for realizing each embodiment of the invention；

Fig. 2 is a kind of flow chart of image exposure compensation method of the present invention；

Fig. 3 is that a kind of of the present invention is exposed the compensation division of subregion to image and right based on pixel distribution feature Subregion is exposed the theory diagram of compensation；

Fig. 4 is a kind of schematic diagram of exposure sub-zone dividing to shooting preview image of the present invention；

Fig. 5 is a kind of based on schematic diagram of the fringe region to the exposure sub-zone dividing of shooting preview image of the present invention；

Fig. 6 is a kind of hardware architecture diagram of image exposure compensation device of the present invention；

Fig. 7 is a kind of division for being exposed compensation subregion to image based on brightness identification and limb recognition of the present invention And the theory diagram of compensation is exposed to subregion.

The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.

Embodiment

It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.

In follow-up description, the suffix using such as " module ", " part " or " unit " for representing element is only Be conducive to the explanation of the present invention, itself there is no a specific meaning.Therefore, " module ", " part " or " unit " can be mixed Ground is used.

Terminal can be implemented in a variety of manners.For example, the terminal described in the present invention can include such as mobile phone, flat board Computer, notebook computer, palm PC, personal digital assistant (Personal Digital Assistant, PDA), portable Media player (Portable Media Player, PMP), guider, wearable device, Intelligent bracelet, pedometer etc. are moved Move the fixed terminals such as terminal, and numeral TV, desktop computer.

It will be illustrated in subsequent descriptions by taking mobile terminal as an example, it will be appreciated by those skilled in the art that except special Outside element for moving purpose, construction according to the embodiment of the present invention can also apply to the terminal of fixed type.

Referring to Fig. 1, its hardware architecture diagram for a kind of mobile terminal of realization each embodiment of the invention, the shifting Dynamic terminal 100 can include：RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103rd, A/V (audio/video) input block 104, sensor 105, display unit 106, user input unit 107, interface unit 108th, the part such as memory 109, processor 110 and power supply 111.It will be understood by those skilled in the art that shown in Fig. 1 Mobile terminal structure does not constitute the restriction to mobile terminal, and mobile terminal can be included than illustrating more or less parts, Either combine some parts or different parts arrangement.

The all parts of mobile terminal are specifically introduced with reference to Fig. 1：

Radio frequency unit 101 can be used for receiving and sending messages or communication process in, the reception and transmission of signal, specifically, by base station Downlink information receive after, handled to processor 110；In addition, up data are sent into base station.Generally, radio frequency unit 101 Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrating Frequency unit 101 can also be communicated by radio communication with network and other equipment.Above-mentioned radio communication can use any communication Standard or agreement, including but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications System), GPRS (General Packet Radio Service, general packet radio service), CDMA2000 (Code Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code Division Multiple Access, WCDMA), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division Duplexing-Long Term Evolution, FDD Long Term Evolution) and TDD-LTE (Time Division Duplexing-Long Term Evolution, time division duplex Long Term Evolution) etc..

WiFi belongs to short range wireless transmission technology, and mobile terminal can help user's transmitting-receiving electricity by WiFi module 102 Sub- mail, browse webpage and access streaming video etc., it has provided the user wireless broadband internet and accessed.Although Fig. 1 shows Go out WiFi module 102, but it is understood that, it is simultaneously not belonging to must be configured into for mobile terminal, completely can be according to need To be omitted in the essential scope for do not change invention.

Audio output unit 103 can be in call signal reception pattern, call mode, record mould in mobile terminal 1 00 When under the isotypes such as formula, speech recognition mode, broadcast reception mode, it is that radio frequency unit 101 or WiFi module 102 are received or The voice data stored in memory 109 is converted into audio signal and is output as sound.Moreover, audio output unit 103 The audio output related to the specific function that mobile terminal 1 00 is performed can also be provided (for example, call signal receives sound, disappeared Breath receives sound etc.).Audio output unit 103 can include loudspeaker, buzzer etc..

A/V input blocks 104 are used to receive audio or video signal.A/V input blocks 104 can include graphics processor (Graphics Processing Unit, GPU) 1041 and microphone 1042,1041 pairs of graphics processor is in video acquisition mode Or the view data progress of the static images or video obtained in image capture mode by image capture apparatus (such as camera) Reason.Picture frame after processing may be displayed on display unit 106.Picture frame after being handled through graphics processor 1041 can be deposited Storage is transmitted in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042 Quiet down sound (voice data), and can be voice data by such acoustic processing.Audio (voice) data after processing can To be converted to the form output that mobile communication base station can be sent to via radio frequency unit 101 in the case of telephone calling model. Microphone 1042 can implement various types of noises and eliminate (or suppression) algorithm to eliminate (or suppression) in reception and send sound The noise produced during frequency signal or interference.

Mobile terminal 1 00 also includes at least one sensor 105, such as optical sensor, motion sensor and other biographies Sensor.Specifically, optical sensor includes ambient light sensor and proximity transducer, wherein, ambient light sensor can be according to environment The light and shade of light adjusts the brightness of display panel 1061, and proximity transducer can close when mobile terminal 1 00 is moved in one's ear Display panel 1061 and/or backlight.As one kind of motion sensor, accelerometer sensor can detect in all directions (general For three axles) size of acceleration, size and the direction of gravity are can detect that when static, the application available for identification mobile phone posture (such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) etc.； The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer, The other sensors such as hygrometer, thermometer, infrared ray sensor, will not be repeated here.

Display unit 106 is used for the information for showing the information inputted by user or being supplied to user.Display unit 106 can be wrapped Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used Forms such as (Organic Light-Emitting Diode, OLED) configures display panel 1061.The display unit of the present invention 106 can be shown to shooting preview image user, and the shooting preview image by exposure compensating is shown into user's sight See.

User input unit 107 can be used for the numeral or character information for receiving input, and produce the use with mobile terminal The key signals input that family is set and function control is relevant.Specifically, user input unit 107 may include contact panel 1071 with And other input equipments 1072.Contact panel 1071, also referred to as touch-screen, collect touch operation of the user on or near it (such as user is using any suitable objects such as finger, stylus or annex on contact panel 1071 or in contact panel 1071 Neighbouring operation), and corresponding attachment means are driven according to formula set in advance.Contact panel 1071 may include touch detection Two parts of device and touch controller.Wherein, touch detecting apparatus detects the touch orientation of user, and detects touch operation band The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it It is converted into contact coordinate, then gives processor 110, and the order sent of reception processing device 110 and can be performed.In addition, can To realize contact panel 1071 using polytypes such as resistance-type, condenser type, infrared ray and surface acoustic waves.Except contact panel 1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can be wrapped Include but be not limited to physical keyboard, in function key (such as volume control button, switch key etc.), trace ball, mouse, action bars etc. One or more, do not limit herein specifically.

Further, contact panel 1071 can cover display panel 1061, detect thereon when contact panel 1071 or After neighbouring touch operation, processor 110 is sent to determine the type of touch event, with preprocessor 110 according to touch thing The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, contact panel 1071 and display panel 1061 be input and the output function that mobile terminal is realized as two independent parts, but in certain embodiments, can By contact panel 1071 and the input that is integrated and realizing mobile terminal of display panel 1061 and output function, not do specifically herein Limit.

Interface unit 108 is connected the interface that can pass through as at least one external device (ED) with mobile terminal 1 00.For example, External device (ED) can include wired or wireless head-band earphone port, external power source (or battery charger) port, wired or nothing Line FPDP, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end Mouth, video i/o port, ear port etc..Interface unit 108 can be used for receiving the input from external device (ED) (for example, number It is believed that breath, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 1 00 or can be with For transmitting data between mobile terminal 1 00 and external device (ED).

Memory 109 can be used for storage software program and various data.Memory 109 can mainly include storing program area And storage data field, wherein, application program (the such as sound that storing program area can be needed for storage program area, at least one function Sound playing function, image player function etc.) etc.；Storage data field can be stored uses created data (such as according to mobile phone Voice data, phone directory etc.) etc..In addition, memory 109 can include high-speed random access memory, it can also include non-easy The property lost memory, for example, at least one disk memory, flush memory device or other volatile solid-state parts.The present invention Memory 109 in can prestore image exposure compensation program.

Processor 110 is the control centre of mobile terminal, utilizes each of various interfaces and the whole mobile terminal of connection Individual part, by operation or performs and is stored in software program and/or module in memory 109, and calls and be stored in storage Data in device 109, perform the various functions and processing data of mobile terminal, so as to carry out integral monitoring to mobile terminal.Place Reason device 110 may include one or more processing units；It is preferred that, processor 110 can integrated application processor and modulatedemodulate mediate Device is managed, wherein, application processor mainly handles operating system, user interface and application program etc., and modem processor is main Handle radio communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.The present invention Processor 110 can run the image exposure compensation program being stored in above-mentioned memory 109, to realize following step： In image shoot process, according to the pixel distribution feature of shooting preview image, shooting preview image is divided into multiple exposures Compensate subregion；According to the pixel distribution feature of each exposure compensating subregion, obtain corresponding with each exposure compensating subregion Exposure compensating parameter；According to exposure compensating parameter corresponding with each exposure compensating subregion, respectively to exposure compensating parameter It is exposed compensation.

Mobile terminal 1 00 can also include the power supply 111 (such as battery) powered to all parts, it is preferred that power supply 111 Can be logically contiguous by power-supply management system and processor 110, so as to realize management charging by power-supply management system, put The function such as electricity and power managed.

Although Fig. 1 is not shown, mobile terminal 1 00 can also will not be repeated here including bluetooth module etc..

Based on above-mentioned mobile terminal hardware configuration, each embodiment of the inventive method is proposed.

Embodiment one：

Traditional exposure technique is to strengthen the brightness and contrast of global image, does not account for pixel distribution in image special Levy, such as be rich in high frequency detail composition at image border, it is necessary to which exposure intensity is big, and the part with big color lump is low in image Frequency existence of redundant is, it is necessary to which exposure intensity is small, by the way of global compensation, it is easy to which the part allowed in image produces overexposure or owed Expose, make picture quality entire lowering.In order to solve this problem, as shown in Fig. 2 the present embodiment shows a kind of image exposure compensation Method, according to the pixel distribution feature of shooting preview image, shooting preview image can be divided into image shoot process Multiple exposure compensating subregions, compensation is exposed to different exposure compensating subregions using different exposure compensating parameters. This subregion exposure compensation to shooting preview image, can be directed to the actual conditions of each exposure compensating subregion, The exposure compensating of varying strength is carried out to each exposure compensating subregion, it is to avoid during using traditional exposure compensating scheme, image The problem of local overexposure or deficient exposure, the experience of taking pictures of user is effectively improved, enhance and mended using the image exposure of the present embodiment The shoot function of the device of compensation method, such as mobile phone.

The present embodiment image exposure compensation method as shown in Figure 2, including：

S201, in image shoot process, according to the pixel distribution feature of shooting preview image, shooting preview image is drawn It is divided into multiple exposure compensating subregions；

S202, the pixel distribution feature according to each exposure compensating subregion, are obtained and each exposure compensating subregion pair The exposure compensating parameter answered；

S203, basis exposure compensating parameter corresponding with each exposure compensating subregion, enter to exposure compensating parameter respectively Row exposure compensating.

Wherein, the device of the shooting image of the present embodiment can be any device with camera and processor, including Mobile terminal such as mobile phone, tablet personal computer, notebook computer etc..

In the present embodiment, the pixel distribution feature of shooting preview image includes but is not limited to, in the shooting preview image The Color Distribution Features of pixel, the Luminance Distribution feature of pixel and the saturation distribution feature of pixel.

, in one embodiment, can be according to shooting preview for the division of exposure compensating subregion in shooting preview image The distribution characteristics of pixel color is divided in image, for example, by area where the close pixel of the color in shooting preview image Domain is divided into same exposure compensating region；For the division of exposure compensating subregion in shooting preview image, implement another Example in, can be divided according to the distribution characteristics of pixel intensity in shooting preview image, for example, by shooting preview image pre- If the first brightness range in region division be the first exposure compensating subregion, by shooting preview image in the second brightness model Region division in enclosing is the second exposure compensating subregion, by the region division in shooting preview image in the 3rd brightness range For the 3rd exposure compensating subregion, etc.；For the division of exposure compensating subregion in shooting preview image, In another embodiment, it can also be divided according to the distribution characteristics of pixel intensity in shooting preview image, for example can be advance Multiple setting pixel intensity scopes, are distributed according to the scope and the pixel intensity of shooting preview image, by shooting preview Image is divided into multiple exposure compensating subregions.

And for a shooting preview image, if in a window neighborhood, the brightness of pixel is compared Big change, then illustrate in the window neighborhood, there is the edge of subject in shooting preview image.For an image Speech, the readability at its edge is to influence a key factor of the picture quality, so in the present embodiment, taking the photograph preview image Pixel distribution feature further comprises the brightness variation characteristic of shooting preview image pixel.For taking the photograph subject in preview image For fringe region, its be rich in high frequency detail composition, it is necessary to exposure intensity it is bigger, in S202 obtain exposure compensating parameter When, it is necessary in view of the demand of fringe region.

, it is necessary to obtain the corresponding exposure compensating ginseng of each exposure compensating subregion after exposure compensating subregion is marked off Number.Include exposure compensating intensity in the exposure compensating parameter of the present embodiment.

Wherein, the corresponding exposure compensating parameter of each exposure compensating subregion is usually different, for example, taking the photograph preview image In shooting main body be one tree, image background is blue sky and white cloud, then the branches and leaves part set can as first exposure subregion, The trunk part of tree is used as the 3rd exposure subregion, the first exposure sub-district as the second exposure subregion, the blue sky and white cloud of background Exposure compensating intensity highest in the exposure compensating parameter that domain is used, next to that the second exposure subregion, is the 3rd exposure again Region.

For above-mentioned exposure compensating parameter, its can be pre-set or in shooting process according to bat Take the photograph what the actual effect of preview image was set in real time.Wherein, when exposure compensating parameter is to pre-set, it can be pre-stored in and work as On the device of preceding shooting, mobile phone is used when such as active user shoots, exposure compensating parameter is pre-stored on mobile phone；Or exposure Compensating parameter can be pre-set on the server, and device (such as mobile phone) is obtained when shooting from the server；Or The device that device can be connected when shooting to it asks exposure compensating parameter, if having on the device of the connection, passes through connection Obtain the exposure compensating parameter.

In S203, it is determined that after exposure compensating parameter, it is possible to be exposed compensation to each exposure compensating parameter.This Compensation can be exposed to shooting preview image using existing exposure compensating algorithm in embodiment.The exposure compensating algorithm bag Include but be not limited to multi-Scale Retinex Algorithm.

Below by taking multi-Scale Retinex Algorithm as an example, and combine the regional exposure principle frame of shooting preview image in Fig. 3 Figure, is illustrated to how multiple exposure compensating subregions are exposed with compensation.

Referring to Fig. 3, it is assumed that for original image S (above-mentioned shooting preview image), according to pixel distribution feature thereon, Original image S is divided for three exposure compensating subregions of region-the first, the second exposure compensating subregion, the 3rd exposure is mended Repay subregion.According to the pixel distribution feature in each region, corresponding compensation yardstick σ is provided with to each region₁、σ₂、 σ₃。

Retinex algorithm rings serious image mainly for the treatment of exposure shadow.Its main target is exactly by a width Given original image S resolves into incident image L (x, y) and reflected image R (x, y), i.e.,

S (x, y)=R (x, y) L (x, y)

It is taken the logarithm and incident image and reflected image is separated, is had

Log [S (x, y)]=log [R (x, y)]+log [L (x, y)]

Latter aspect of taking the logarithm can simplify calculating, on the other hand also comply with the nonlinear characteristic of human eye.

Single scale Retinex algorithm introduces Gaussian filter to estimate incident the vector L, Gaussian function of image

Obtain reflecting component

R (x, y)=S (x, y)-S (x, y) * F (x, y)

In formula, σ is yardstick, and * is convolution, and enhanced image is just obtained by this conversion.

Global image uses same yardstick in the effect of the decision image enhaucament of σ in Gaussian function, single scale Retinex σ, this mode obviously ignores sensitiveness of the different details to enhancing effect.Multiple dimensioned Retinex (MSR, multi-scale Retinex) refer to strengthen picture using different scale σ in different zones, then combined in the way of linear weighted function, this The method of kind, which overcomes single scale Retinex algorithm, can not take into account the determination of σ values so that picture overall color fidelity, detail portion Divide enhancing.

In formula, F_i(x, y) is that parameter is σ_lGaussian function, W_lTo strengthen the weight added by image for each,N is Gaussian function total number.

In one embodiment, the above-mentioned pixel distribution feature according to shooting preview image, shooting preview image is divided Include for multiple exposure compensating subregions：

According to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into multiple brightness related The different exposure compensating subregion of characteristic, brightness correlation properties include brightness and/or brightness change speed.For an image Speech, the characteristic distributions of its brightness include the size distribution of brightness and the Variation Features of brightness.

So in one embodiment, shooting preview image can be divided according to brightness of image in shooting preview image For the different exposure compensating subregion of multiple brightness correlation properties.For example, in the shooting preview picture shown in Fig. 4, shooting Main body is truss A, and its brightness is higher, and background is ground B, and its brightness is relatively low, then can be by shooting preview picture according to brightness It is divided into the first exposure compensating subregion where flower, and the second exposure compensating subregion where ground, the first exposure compensating Subregion and the second exposure compensating subregion are exposed compensation using different exposure intensities.

Further, according to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into many The different exposure compensating subregion of individual brightness correlation properties includes：To shooting preview image zooming-out luminance component, according to brightness point Amount and default Luminance Analysis model, shooting preview image are divided into the exposure compensating subregion of multiple different brightness degrees. Wherein, default Luminance Analysis module includes but is not limited to LIP models.Before to shooting preview image zooming-out luminance component, also Shooting preview image first can be converted into the HIS color space types that suitable human eye is perceived.For example, in one embodiment will Shooting preview image is to be adapted to the HIS color spaces of human eye perception and extract luminance component from color space conversion, using pre- If LIP models, shooting preview image is divided into by low brightness area I according to brightness difference₁, middle luminance area I₂And saturation region Domain I₃Deng 3 parts.

LIP brightness is divided below and illustrated：

In theorem in Euclid space, gray tone function is defined as

P (x, y)=M (1-I (x, y)/I_max) (0.1)

In formula, M is gray value, and I (x, y) is luminance component, I_maxFor luminance saturation value.

LIP models are divided according to brightness of image, if P (x, y) and Q (x, y) is 2 gray tone functions, and a is positive real Number, defines computing

P (x, y) ⊙ Q (x, y)=M (P (x, y)-Q (x, y))/(M-Q (x, y))

WhereinWithThe calculating of gray tone function constitute vector space Z, gray tone vector Z and real number space is same Structure, becomes by δ and gets in return

δ (P (x, y))=- Mln (1-P (x, y)/M)

The similarly suitable gray tone space of conversion of real number space, and (P (x, y) is defined as by δ

P=δ (P (x, y))

P represents the gray tone function by conversion, and it has been the real number in real number field, and inverse transformation formula is

The exactly LIP origin of logarithm operation herein.

In one embodiment, compensation subregion only can be exposed according to brightness change speed in shooting preview image Division.Then according to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into multiple brightness phases Closing the different exposure compensating subregion of characteristic includes：Rim detection is carried out to shooting preview image to determine in shooting preview image Subject fringe region and non-shooting thing fringe region, two are set to by subject fringe region and non-shooting thing fringe region Different exposure compensating subregions.Wherein, the fringe region of subject is that brightness changes greatly obvious region.For one For shooting preview image, wherein may be comprising many subject, each subject has its edge, so in an image Fringe region should be able to be multiple edge cell domains set.For example in the shooting preview image shown in Fig. 5, subject is Vase C, shooting background is wall D, then what is shooting preview image progress rim detection obtained is vase C subject marginal zone Remaining region in the region that twice dotted line in domain, such as figure is irised out, shooting preview image is non-subject fringe region, is such as schemed Wall and vase in 5 not in the range of dotted line.

For the object in shooting preview image, its edge shows as local feature discontinuity, such as gray scale, face Color, the mutation of texture structure.Edge is to discriminate between the boundary of different zones.Image border characteristic includes：Direction and amplitude.Along side The pixel grey scale change of edge trend is gentle, and the pixel grey scale conversion of vertical edge trend is violent.

Rim detection is exactly the characteristics of variation of image grayscale is most violent using edge, in a window neighborhood, to figure As each pixel is differentiated or second-order differential determines marginal point.The side of image is correspond at the peak value of first differential image Edge point, the zero crossing of second-order differential image correspond to the marginal point of image.For image, computing differential can be converted to calculating ladder Degree.The critical nature of image gradient is：The direction of gradient is upper gradation of image maximum rate of change, and it reflects image side just Grey scale change on edge.In this patent, because being image to be converted in HIS space, rim detection to track yes The sudden change region of brightness.

Conventional edge extracting gradient operator has：Robert operators, Sobel operators, Prewitt operators, Krisch operators, Canny operators.In the present embodiment, Sobel operators can be preferentially chosen, although Sobel algorithms detection edge is not most accurate , but its algorithm is simple, efficiency high, in use, the processor of mobile phone will not be taken too much in terminal especially mobile phone Resource.

Sobel is that the gradient of center pixel is estimated with 8 pixels of surrounding, and Sobel operators are to the point close to center pixel Higher weight should be given, so the pixel weight abutted with center pixel 4 is set to the volume of 2 or -2, Sobel edge detection algorithms Accumulating core is：

In one embodiment, brightness division and rim detection can be combined and shooting preview image is exposed Compensate the division of subregion.According to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into many The different exposure compensating subregion of individual brightness correlation properties includes：To shooting preview image zooming-out luminance component, according to brightness point Amount and default Luminance Analysis model, shooting preview image are divided into the exposure compensating subregion of multiple different brightness degrees； The subject fringe region in shooting preview image is determined to shooting preview image progress rim detection, by subject fringe region It is set to exposure compensating subregion；Wherein, only according to subject fringe region when being exposed compensation to subject fringe region Corresponding exposure compensating parameter is exposed compensation.

In this exposure sub-zone dividing scheme, the order of brightness division and rim detection to shooting preview image exists It is not have conditional in the present embodiment, compensation subregion can be exposed first to shooting preview image zooming-out luminance component Divide, rim detection identification fringe region can also be first carried out to shooting preview image.But the marginal zone for identifying Domain, even if it is also only used and subject fringe region in some or certain several exposure subregions marked off according to brightness Corresponding exposure compensating parameter is exposed compensation.

In one embodiment, subject thing fringe region can be first recognized, such as in Fig. 5 image, first identification is spent Fig. 5, the exposure of multiple brightness degrees is divided into further according to brightness in Fig. 5 by bottle C fringe region (dashed region in such as figure) Compensate subregion, it is assumed that in Figure 5 according to brightness divide be vase C where region and background D regions, then calculate get up one Have three regional exposure subregions：The fringe region of vase, vase C non-edge, wall D non-edge.

Except overseas using the Luminance Distribution feature division exposure compensating sub-district in shooting preview image, bat can also be utilized The distribution for the color taken the photograph in preview image divides exposure compensating subregion.In one embodiment, according to shooting preview image Pixel distribution feature, shooting preview image is divided into multiple exposure compensating subregions includes：Determine face in shooting preview image The distribution of color, multiple exposure compensating subregions are divided into according to the distribution of color by shooting preview image；Exposure compensating subregion In include is the close color lump of color.Or by taking the shooting preview image in Fig. 5 as an example, it is assumed that vase C color is red, Wall D is white, then the exposure subregion marked off includes vase region and wall body area.For the exposure divided according to color Compensate subregion, its exposure compensating parameter is the parameter that can be set according to color or according to exposure compensating subregion Brightness set parameter.

After exposure compensating subregion is marked off, exposure compensating parameter is exactly obtained.Wherein, obtain and each exposure compensating The corresponding exposure compensating parameter of subregion includes：Chosen from default exposure compensating parameter and be adapted to each exposure compensating subregion Exposure compensating parameter.Wherein default exposure compensating parameter can be with existing in the terminal of shooting image or with depositing On external memory such as server, obtained from the device shot to external memory.Default exposure compensating parameter can With the parameter set including the parameter set according to color, according to brightness and the parameter set for fringe region.

In one embodiment, obtaining exposure compensating parameter corresponding with each exposure compensating subregion includes：According to each The characteristics of Luminance Distribution of individual exposure compensating subregion, sets the corresponding exposure compensating parameter of each exposure compensating subregion in real time. In this scenario, can according to the brightness degree of the exposure compensating subregion divided in current shooting preview image and whether be Subject fringe region to set exposure compensating parameter for exposure compensating subregion.Higher for example is set to subject fringe region Exposure compensating intensity, the region higher to brightness sets less exposure compensating intensity etc..

The image exposure compensation method proposed using the present embodiment, can be in image shoot process, according to shooting preview The pixel distribution feature of image, multiple exposure compensating subregions are divided into by shooting preview image；According to each exposure compensating The pixel distribution feature in region, obtains exposure compensating parameter corresponding with each exposure compensating subregion；According to exposure compensating The corresponding exposure compensating parameter of subregion, is exposed compensation to exposure compensating parameter respectively.Relative to figure of the prior art As global exposure compensating, the present embodiment has carried out exposure compensating sub-zone dividing according to the pixel distribution feature of image to image, Each sub-regions are respectively arranged with corresponding exposure compensating parameter, so each exposure compensating subregion can be obtained suitably Different degrees of exposure compensating, reduces overexposure and owes to expose existing possibility, improve the image quality of image, improve the shooting of user Experience.

Further, the present embodiment can carry out figure area to the subject fringe region in shooting preview image, to shooting Thing fringe region uses the edge in corresponding exposure compensating parameter, reinforcing image so that image outline sense is stronger, presentation it is vertical Body effect is more preferable.

Embodiment two：

Referring to Fig. 6, the present embodiment proposes a kind of image exposure compensation device, and the image exposure compensation device includes processor 61, memory 62 and communication bus 63；Communication bus 63 is used to realize the connection communication between processor and memory；Processor 61 are used to perform the image exposure compensation program stored in memory 62, to realize following steps：In image shoot process, root According to the pixel distribution feature of shooting preview image, shooting preview image is divided into multiple exposure compensating subregions；According to each The pixel distribution feature of exposure compensating subregion, obtains exposure compensating parameter corresponding with each exposure compensating subregion；According to Exposure compensating parameter corresponding with each exposure compensating subregion, is exposed compensation to exposure compensating parameter respectively.

Wherein, the image exposure compensation device of the present embodiment can be any device with camera and processor, bag Include mobile terminal such as mobile phone, tablet personal computer, notebook computer etc..In the present embodiment, the pixel distribution of shooting preview image is special Levy including but not limited to, the Color Distribution Features of the pixel in the shooting preview image, the Luminance Distribution feature and pixel of pixel Saturation distribution feature.

, can be according to pixel color in shooting preview image for the division of exposure compensating subregion in shooting preview image Distribution characteristics divide；It can be divided according to the distribution characteristics of pixel intensity in shooting preview image, can also be according to bat Take the photograph the distribution characteristics of pixel intensity in preview image to divide, for example, multiple in advance pixel intensity scopes, root can be set It is distributed according to the scope and the pixel intensity of shooting preview image, shooting preview image is divided into multiple exposure compensating sub-districts Domain.

And for a shooting preview image, if in a window neighborhood, the brightness of pixel is compared Big change, then illustrate in the window neighborhood, there is the edge of subject in shooting preview image.For an image Speech, the readability at its edge is to influence a key factor of the picture quality, so in the present embodiment, taking the photograph preview image Pixel distribution feature further comprises the brightness variation characteristic of shooting preview image pixel.For taking the photograph subject in preview image For fringe region, its be rich in high frequency detail composition, it is necessary to exposure intensity it is bigger, processor 61 obtain exposure compensating parameter When, it is necessary in view of the demand of fringe region.Include exposure compensating intensity in the exposure compensating parameter of the present embodiment.Its In, the corresponding exposure compensating parameter of each exposure compensating subregion is usually different.

In one embodiment, processor 61 is used to perform image exposure compensation program, to realize following steps：According to bat The characteristic distributions of brightness of image in preview image are taken the photograph, shooting preview image is divided into the different exposure of multiple brightness correlation properties Subregion is compensated, brightness correlation properties include brightness and/or brightness change speed.For an image, point of its brightness Cloth feature includes the size distribution of brightness and the Variation Features of brightness.

So in one embodiment, processor 61 is used to perform image exposure compensation program, to realize following steps：Root According to brightness of image in shooting preview image, shooting preview image is divided into different exposure compensating of multiple brightness correlation properties Region.

Further, processor 61 is used to perform image exposure compensation program, to realize following steps：To shooting preview figure As extract light intensity level；According to luminance component and default Luminance Analysis model, shooting preview image is divided into multiple differences The exposure compensating subregion of brightness degree.Wherein, default Luminance Analysis module includes but is not limited to LIP models.To shooting Before preview image extract light intensity level, shooting preview image first can also be converted into the HIS color spaces that suitable human eye is perceived Type.LIP brightness is divided and described referring to the correlation of embodiment one.

Can also be the partitioning standards of exposure compensating subregion in view of brightness change speed in shooting preview image.One In individual embodiment, processor 61 is used to perform image exposure compensation program, to realize following steps：Shooting preview image is carried out Rim detection determines subject fringe region and non-shooting thing fringe region in shooting preview image；By subject fringe region With the non-shooting thing fringe region exposure compensating subregion that to be set to two different.Wherein, the fringe region of subject is brightness Change greatly obvious region.For a shooting preview image, wherein many subject, each bat may be included Taking the photograph thing has its edge, so the fringe region in an image should be able to be the set in multiple edge cell domains.

For the object in shooting preview image, its edge shows as local feature discontinuity, and edge is to discriminate between The boundary of different zones.The pixel grey scale change moved towards along edge is gentle, and the pixel grey scale conversion of vertical edge trend is violent. Rim detection is exactly the characteristics of variation of image grayscale is most violent using edge, in a window neighborhood, to each picture of image Vegetarian refreshments is differentiated or second-order differential determines marginal point.The marginal point of image, two are correspond at the peak value of first differential image The zero crossing of rank differential map picture correspond to the marginal point of image.For image, computing differential can be converted to calculating gradient.Image The critical nature of gradient is：The direction of gradient is upper gradation of image maximum rate of change, and it reflects on image border just Grey scale change.In this patent, because being that image is converted to track the brightness for being in HIS space, rim detection Sudden change region.

In one embodiment, brightness division and rim detection can be combined and shooting preview image is exposed Compensate the division of subregion.Processor 61 is used to perform image exposure compensation program, to realize following steps：To shooting preview figure As extract light intensity level, according to luminance component and default Luminance Analysis model, shooting preview image is divided into multiple differences The exposure compensating subregion of brightness degree；The subject in shooting preview image is determined to shooting preview image progress rim detection Fringe region, by subject fringe region exposure compensating subregion；Wherein, when being exposed compensation to subject fringe region only Compensation is exposed according to the corresponding exposure compensating parameter of subject fringe region.

In this exposure sub-zone dividing scheme, the order of brightness division and rim detection to shooting preview image exists It is not have conditional in the present embodiment, processor 61 can perform image exposure compensation program, first realize step：To shooting preview Image zooming-out luminance component, is exposed the division of compensation subregion, can also first realize step：Shooting preview image is carried out Rim detection recognizes fringe region.But the fringe region for identifying, even if its with some or certain it is several according to brightness The exposure subregion marked off has overlapping, also only uses exposure compensating parameter corresponding with subject fringe region to be exposed benefit Repay.

With reference to Fig. 7 theory diagram, compensation is exposed to set brightness division and rim detection in the present embodiment Illustrate.

For original image S (above-mentioned shooting preview image), using brightness of the LIP models in image by image S It is divided into low brightness area I₁, middle luminance area I₂With high-brightness region I₃.Image S is marked off using Sobel edge detection methods In subject fringe region I₄.To low brightness area I₁, middle luminance area I₂With high-brightness region I₃With fringe region I₄, use Exposure compensating algorithm be SSR (multi-Scale Retinex Algorithm, MSR) exposure compensating algorithm, to low brightness area I₁, middle brightness Region I₂With high-brightness region I₃With fringe region I₄Compensation yardstick σ 1, σ 2, σ 3, σ 4 are set respectively.Wherein it should be noted that I₄With other regions (low brightness area I₁, middle luminance area I₂With high-brightness region I₃In one or more) certainly exist Overlap, the compensation yardstick in these regions overlapped is all σ 4.

Except overseas using the Luminance Distribution feature division exposure compensating sub-district in shooting preview image, bat can also be utilized The distribution for the color taken the photograph in preview image divides exposure compensating subregion.In one embodiment, processor 61 is used to perform figure As exposure compensating program, to realize following steps：The distribution of color in shooting preview image is determined, will be clapped according to the distribution of color Take the photograph preview image and be divided into multiple exposure compensating subregions；What is included in exposure compensating subregion is the close color lump of color.

After exposure compensating subregion is marked off, exposure compensating parameter is exactly obtained.Wherein, processor 61 is used to perform figure As exposure compensating program, to realize following steps：Chosen from default exposure compensating parameter and be adapted to each exposure compensating sub-district The exposure compensating parameter in domain.Wherein default exposure compensating parameter can with exist in the terminal of shooting image or with Exist on external memory such as server, obtained from the device shot to external memory.Default exposure compensating parameter The parameter, the parameter set according to brightness and the parameter set for fringe region set according to color can be included.

In one embodiment, processor 61 is used to perform image exposure compensation program, to realize following steps：According to each The characteristics of Luminance Distribution of individual exposure compensating subregion, sets the corresponding exposure compensating parameter of each exposure compensating subregion in real time. In this scenario, can according to the brightness degree of the exposure compensating subregion divided in current shooting preview image and whether be Subject fringe region to set exposure compensating parameter for exposure compensating subregion.Higher for example is set to subject fringe region Exposure compensating intensity, the region higher to brightness sets less exposure compensating intensity etc..

The image exposure compensation device proposed using the present embodiment, the image of processor operation pre-selection storage in memory Exposure compensating program, can carry out exposure compensating sub-zone dividing, each height to image according to the pixel distribution feature of image Region is respectively arranged with corresponding exposure compensating parameter, so each exposure compensating subregion can obtain suitable different journeys The exposure compensating of degree, the device of the present embodiment effectively reduces overexposure and owes to expose existing possibility, improves the image quality of image, carries The shooting experience of high user.And the profile of shooting preview image can also be strengthened, stereoeffect is improved.

Embodiment three：

The present embodiment proposes a kind of computer-readable recording medium, the computer-readable recording medium storage have one or Multiple programs, one or more program can be performed, to realize following steps：

In image shoot process, according to the pixel distribution feature of shooting preview image, shooting preview image is divided into Multiple exposure compensating subregions；According to the pixel distribution feature of each exposure compensating subregion, obtain and each exposure compensating The corresponding exposure compensating parameter in region；According to exposure compensating parameter corresponding with each exposure compensating subregion, respectively to exposure Compensating parameter is exposed compensation.

And for a shooting preview image, if in a window neighborhood, the brightness of pixel is compared Big change, then illustrate in the window neighborhood, there is the edge of subject in shooting preview image.For an image Speech, the readability at its edge is to influence a key factor of the picture quality, so in the present embodiment, taking the photograph preview image Pixel distribution feature further comprises the brightness variation characteristic of shooting preview image pixel.For taking the photograph subject in preview image For fringe region, its be rich in high frequency detail composition, it is necessary to exposure intensity it is bigger, obtain exposure compensating parameter when, it is necessary to examine Consider the demand of fringe region.Include exposure compensating intensity in the exposure compensating parameter of the present embodiment.Wherein, each exposes It is usually different to compensate the corresponding exposure compensating parameter of subregion.

In one embodiment, one or more program of the computer-readable recording medium storage can be performed, with Realize following steps：According to the characteristic distributions of brightness of image in shooting preview image, shooting preview image is divided into multiple bright The different exposure compensating subregion of correlation properties is spent, brightness correlation properties include brightness and/or brightness change speed.For one For image, the characteristic distributions of its brightness include the size distribution of brightness and the Variation Features of brightness.

So in one embodiment, one or more program of the computer-readable recording medium storage can be held OK, to realize following steps：According to brightness of image in shooting preview image, shooting preview image is divided into multiple brightness related The different exposure compensating subregion of characteristic.

Further, locating one or more program of the computer-readable recording medium storage can be performed, to realize Following steps：To shooting preview image zooming-out luminance component；It is pre- by shooting according to luminance component and default Luminance Analysis model Image of looking at is divided into the exposure compensating subregion of multiple different brightness degrees.Wherein, default Luminance Analysis module is included but not It is limited to LIP models.Before to shooting preview image zooming-out luminance component, shooting preview image first can also be converted into suitable people The HIS color space types that eye is perceived.LIP brightness is divided and described referring to the correlation of embodiment one.

Can also be the partitioning standards of exposure compensating subregion in view of brightness change speed in shooting preview image.One In individual embodiment, one or more program of the computer-readable recording medium storage can be performed, to realize following steps： Rim detection is carried out to shooting preview image and determines the subject fringe region in shooting preview image and non-shooting thing marginal zone Domain；The exposure compensating subregion that subject fringe region and non-shooting thing fringe region are set into two is different.Wherein, shoot The fringe region of thing is that brightness changes greatly obvious region.For a shooting preview image, wherein may include Many subject, each subject has its edge, so the fringe region in an image should be able to be that multiple edges are small The set in region.

In one embodiment, brightness division and rim detection can be combined and shooting preview image is exposed Compensate the division of subregion.One or more program of the computer-readable recording medium storage can be performed, with realize with Lower step：To shooting preview image zooming-out luminance component, according to luminance component and default Luminance Analysis model, by shooting preview Image is divided into the exposure compensating subregion of multiple different brightness degrees；Rim detection is carried out to shooting preview image to determine to shoot Subject fringe region in preview image, exposure compensating subregion is set to by subject fringe region；Wherein, to subject When fringe region is exposed compensation, compensation is exposed only according to the corresponding exposure compensating parameter of subject fringe region.

In this exposure sub-zone dividing scheme, the order of brightness division and rim detection to shooting preview image exists It is not have conditional in the present embodiment, one or more program of the computer-readable recording medium storage can be performed, first Realize following steps：To shooting preview image zooming-out luminance component, according to luminance component and default Luminance Analysis model, it will clap Take the photograph the exposure compensating subregion that preview image is divided into multiple different brightness degrees；Or first realize following steps：It is pre- to shooting Image of looking at progress rim detection determines the subject fringe region in shooting preview image, and subject fringe region is set to expose Light compensates subregion.But fringe region for identifying, even if it several is marked off with some or certain according to brightness Exposure subregion has overlapping, also only uses exposure compensating parameter corresponding with subject fringe region to be exposed compensation.

Except overseas using the Luminance Distribution feature division exposure compensating sub-district in shooting preview image, bat can also be utilized The distribution for the color taken the photograph in preview image divides exposure compensating subregion.In one embodiment, the computer-readable storage medium One or more program of matter storage can be performed, to realize following steps：The distribution of color in shooting preview image is determined, Shooting preview image is divided into by multiple exposure compensating subregions according to the distribution of color；What is included in exposure compensating subregion is The close color lump of color.

After exposure compensating subregion is marked off, exposure compensating parameter is exactly obtained.Wherein, the computer-readable storage medium One or more program of matter storage can be performed, to realize following steps：Chosen from default exposure compensating parameter suitable Close the exposure compensating parameter of each exposure compensating subregion.Can be with there is shooting image in wherein default exposure compensating parameter In terminal or with existing on external memory such as server, obtained from the device shot to external memory.In advance If the exposure compensating parameter parameter that can include being set according to color, the parameter that is set according to brightness and set for fringe region The parameter put.

In one embodiment, one or more program of the computer-readable recording medium storage can be performed, with Realize following steps：Each exposure compensating subregion is set in real time according to the characteristics of the Luminance Distribution of each exposure compensating subregion Corresponding exposure compensating parameter.In this scenario, can be according to the exposure compensating sub-district divided in current shooting preview image The brightness degree in domain and whether be subject fringe region come for exposure compensating subregion set exposure compensating parameter.For example to clapping Take the photograph thing fringe region and higher exposure compensating intensity is set, the region higher to brightness sets less exposure compensating intensity etc. Deng.

The computer-readable recording medium proposed using the present embodiment, runs one or more programs of its storage, can be with Exposure compensating sub-zone dividing is carried out to image according to the pixel distribution feature of image, each sub-regions are respectively arranged with correspondence Exposure compensating parameter, so each exposure compensating subregion can obtain suitable different degrees of exposure compensating, this reality Applying example effectively reduces overexposure and owes to expose existing possibility, improves the image quality of image, improves the shooting experience of user.

It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row His property is included, so that process, method, article or device including a series of key elements not only include those key elements, and And also including other key elements being not expressly set out, or also include for this process, method, article or device institute inherently Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this Also there is other identical element in process, method, article or the device of key element.

The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.

Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases The former is more preferably embodiment.Understood based on such, technical scheme is substantially done to prior art in other words Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium In (such as ROM/RAM, magnetic disc, CD), including some instructions are to cause a station terminal (can be mobile phone, computer, service Device, air conditioner, or network equipment etc.) method that performs each of the invention embodiment.

Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot Form, these are belonged within the protection of the present invention.

Claims

1. a kind of image exposure compensation method, it is characterised in that including：

In image shoot process, according to the pixel distribution feature of shooting preview image, the shooting preview image is divided into Multiple exposure compensating subregions；

According to the pixel distribution feature of each exposure compensating subregion, obtain exposure corresponding with each exposure compensating subregion and mend Repay parameter；

According to exposure compensating parameter corresponding with each exposure compensating subregion, the exposure compensating subregion is exposed respectively Light is compensated.

2. image exposure compensation method as claimed in claim 1, it is characterised in that the pixel according to shooting preview image Distribution characteristics, the shooting preview image is divided into multiple exposure compensating subregions includes：

According to the characteristic distributions of brightness of image in shooting preview image, the shooting preview image is divided into multiple brightness related The different exposure compensating subregion of characteristic, the brightness correlation properties include brightness and/or brightness change speed.

3. image exposure compensation method as claimed in claim 2, it is characterised in that image in the image according to shooting preview The characteristic distributions of brightness, the different exposure compensating subregion bag of multiple brightness correlation properties is divided into by the shooting preview image Include：

To shooting preview image zooming-out luminance component, according to the luminance component and default Luminance Analysis model, clapped described Take the photograph the exposure compensating subregion that preview image is divided into multiple different brightness degrees；

Or, rim detection is carried out to shooting preview image and determines subject fringe region in the shooting preview image and non- Subject fringe region, the exposure compensating that the subject fringe region and non-shooting thing fringe region are set into two is different Subregion；

Or, to shooting preview image zooming-out luminance component, according to the luminance component and default Luminance Analysis model, by institute State the exposure compensating subregion that shooting preview image is divided into multiple different brightness degrees；Edge inspection is carried out to shooting preview image The subject fringe region determined in the shooting preview image is surveyed, the subject fringe region is set to exposure compensating Region；Wherein, mended when compensation is exposed to the subject fringe region only according to the corresponding exposure of subject fringe region Repay parameter and be exposed compensation.

4. image exposure compensation method as claimed in claim 1, it is characterised in that the pixel according to shooting preview image Distribution characteristics, the shooting preview image is divided into multiple exposure compensating subregions includes：

The distribution of color in shooting preview image is determined, is divided into the shooting preview image according to the distribution of the color many Individual exposure compensating subregion；What is included in the exposure compensating subregion is the close color lump of color.

5. the image exposure compensation method as described in claim any one of 1-4, it is characterised in that the acquisition exposes with each The corresponding exposure compensating parameter of compensation subregion includes：

Or, each exposure compensating subregion described in setting in real time according to the characteristics of the Luminance Distribution of each exposure compensating subregion Corresponding exposure compensating parameter.

6. a kind of image exposure compensation device, it is characterised in that described image exposure compensating device includes processor, memory and Communication bus；

The communication bus is used to realize the connection communication between the processor and the memory；

The processor is used to perform the image exposure compensation program stored in the memory, to realize following steps：

7. image exposure compensation device as claimed in claim 6, it is characterised in that the processor is used to perform described image Exposure compensating program, to realize following steps：

8. image exposure compensation device as claimed in claim 7, it is characterised in that the processor is used to perform described image Exposure compensating program, to realize following steps：

To the shooting preview image zooming-out luminance component, according to the luminance component and default Luminance Analysis model, by institute State the exposure compensating subregion that shooting preview image is divided into multiple different brightness degrees；

Or, for determining the subject fringe region in the shooting preview image to shooting preview image progress rim detection With non-shooting thing fringe region, the exposure that the subject fringe region and non-shooting thing fringe region are set into two is different Compensate subregion；

Or, for shooting preview image zooming-out luminance component, according to the luminance component and default Luminance Analysis model, The shooting preview image is divided into the exposure compensating subregion of multiple different brightness degrees；Side is carried out to shooting preview image Edge detection determines the subject fringe region in the shooting preview image, and the subject fringe region is set into exposure mends Repay subregion；Wherein, the subject fringe region is exposed corresponding only according to the subject fringe region during compensation Exposure compensating parameter be exposed compensation.

9. the image exposure compensation device as described in claim any one of 6-8, it is characterised in that the processor is used to perform Described image exposure compensating program, to realize following steps：

10. a kind of computer-readable recording medium, it is characterised in that the computer-readable recording medium storage have one or Multiple programs, one or more of programs can be performed, to realize following steps：