CN107592473A - Exposure parameter method of adjustment, device, electronic equipment and readable storage medium storing program for executing - Google Patents
Exposure parameter method of adjustment, device, electronic equipment and readable storage medium storing program for executing Download PDFInfo
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Abstract
The application is related to a kind of exposure parameter method of adjustment, device, electronic equipment and readable storage medium storing program for executing.The above method includes：If it is backlight scene to detect present filming scene, the exposure parameter of a two field picture in multiframe preview image is improved；Recognition of face is carried out to the image for improving exposure parameter, detects in the image for improving exposure parameter and whether there is face to be captured；If face to be captured be present in the image for improving exposure parameter, the exposure parameter of electronic equipment is adjusted.The above method, by improving the exposure of a two field picture in multiple image, the power consumption of electronic equipment can be saved；After face is detected, the exposure of electronic equipment is adjusted.It may be such that face imaging is bright, clear in backlight scene hypograph, improves the image quality of image.
Description
Technical field
The application is related to field of computer technology, more particularly to a kind of exposure parameter method of adjustment, device, electronic equipment
And readable storage medium storing program for executing.
Background technology
With developing rapidly for electronic equipment, increasing user is taken pictures using electronic equipment.Using electronics
When equipment is taken pictures, when photographed scene is in backlight scene, because portrait is in the centre of light source and electronic equipment, cause
Background parts are brighter, portrait part is dark, and portrait imaging is dark in the image shot, and picture quality is poor.
The content of the invention
The embodiment of the present application provides a kind of exposure parameter method of adjustment, device, electronic equipment and readable storage medium storing program for executing, can be with
The shooting effect to portrait is improved under backlighting condition.
A kind of exposure parameter method of adjustment, including：
If it is backlight scene to detect present filming scene, the exposure parameter of a two field picture in multiframe preview image is improved；
Recognition of face is carried out to the image for improving exposure parameter, detects and whether there is in the image for improving exposure parameter
Face to be captured；
If face to be captured be present in the image for improving exposure parameter, the exposure parameter of electronic equipment is adjusted.
A kind of exposure parameter adjusting apparatus, including：
First adjusting module, if detecting, present filming scene is backlight scene, is improved after obtaining the image of default frame number
The exposure parameter of next two field picture；
Identification module, for carrying out recognition of face to the image for improving exposure parameter, detect the raising exposure parameter
It whether there is face to be captured in image；
Second adjusting module, if for face be present in the image for improving exposure parameter, adjust the exposure of electronic equipment
Optical parameter.
A kind of electronic equipment, including memory and processor, computer-readable instruction is stored in the memory, it is described
When instruction is by the computing device so that the computing device method as described above.
A kind of computer-readable recording medium, is stored thereon with computer program, and the computer program is held by processor
Method as described above is realized during row.
In the embodiment of the present application, under backlight scene, by improving the exposure parameter of a two field picture in multiple image, i.e.,
Improve exposure.Detection, which is improved in exposure image, whether there is face, face be present when improving in exposure image, then electronics
Equipment adjusts exposure.The above method, by improving the exposure of a two field picture in multiple image, electronic equipment can be saved
Power consumption；After face is detected, the exposure of electronic equipment is adjusted.May be such that in backlight scene hypograph face imaging it is bright,
Clearly, the image quality of image is improved.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the internal structure schematic diagram of electronic equipment 10 in one embodiment；
Fig. 2 is the flow chart of exposure parameter method of adjustment in one embodiment；
Fig. 3 is the flow chart of exposure parameter method of adjustment in another embodiment；
Fig. 4 is the flow chart of exposure parameter method of adjustment in another embodiment；
Fig. 5 is the structured flowchart of exposure parameter adjusting apparatus in one embodiment；
Fig. 6 is the structured flowchart of exposure parameter adjusting apparatus in another embodiment；
Fig. 7 is the schematic diagram of image processing circuit in one embodiment.
Embodiment
In order that the object, technical solution and advantage of the application are more clearly understood, it is right below in conjunction with drawings and Examples
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, and
It is not used in restriction the application.
Fig. 1 is the internal structure schematic diagram of electronic equipment 10 in one embodiment.As shown in figure 1, the electronic equipment 10 wraps
Include the processor connected by system bus, non-volatile memory medium, built-in storage, network interface, display screen and input dress
Put.Wherein, the non-volatile memory medium of electronic equipment 10 is stored with operating system and computer-readable instruction.The computer can
To realize a kind of image processing method when reading instruction is executed by processor.The processor is used to provide calculating and control ability, branch
Support the operation of whole electronic equipment 10.Built-in storage in electronic equipment 10 is computer-readable in non-volatile memory medium
The operation of instruction provides environment.Network interface is used to carry out network service with server.The display screen of electronic equipment 10 can be
LCDs or electric ink display screen etc., input unit can be the touch layers or electricity covered on display screen
Button, trace ball or the Trackpad or the external keyboard that are set on the sub- shell of equipment 10, Trackpad or mouse etc..Should
Electronic equipment 10 can be mobile phone, tablet personal computer or personal digital assistant or Wearable etc..Those skilled in the art can
To understand, the block diagram of the structure, the only part-structure related to application scheme that are shown in Fig. 1, do not form to this Shen
Please the restriction of electronic equipment 10 that is applied thereon of scheme, specific electronic equipment 10 can include it is more more than shown in figure or
Less part, either combine some parts or arranged with different parts.
Fig. 2 is the flow chart of exposure parameter method of adjustment in one embodiment.A kind of as shown in Fig. 2 exposure parameter adjustment
Method, including：
Step 202, if detecting, present filming scene is backlight scene, improves the exposure of a two field picture in multiframe preview image
Optical parameter.
Backlight scene refers to state of the main body between light source and electronic equipment that be taken.Under backlight scene, due to the back of the body
Scape part luma is higher, easily cause shot subject exposure it is insufficient, picture imaging effect is poor.Electronic equipment is opening shooting
After class application program, the preview graph of current scene can be shot.After the preview graph of current scene is obtained, electronic equipment can obtain
State the grey level histogram of preview graph.Under backlight scene, in incandescent gray level and very dark gray level in the grey level histogram of image
Upper pixel distribution is higher, i.e., pixel is mainly distributed on the gray level of both sides in histogram in the grey level histogram of image, in Nogata
Scheme the less of middle grey level distribution；And under non-backlight scene, pixel is mainly distributed on directly in the grey level histogram of image
Gray level among side's figure.Electronic equipment, can be by analyzing grey level histogram after the grey level histogram of preview graph is got
Distribution situation judges whether preview graph is backlight image., can be by preview after electronic equipment gets the grey level histogram of preview graph
The gray scale of figure is divided into the grade of predetermined number, if the ratio in the pixel quantity of given level exceedes preset value, judges preview graph
For backlight image, then present filming scene is backlight scene.For example, electronic equipment by the grey level histogram of preview image by very dark
Gray level is divided into 1,2,3,4,5,6,7,8,9,10 grades to incandescent gray level, if in the pixel of 1,2,9,10 this 4 grades
Quantity sum accounts for more than the 50% of total pixel, then judges that preview image is backlight image, then present filming scene is backlight scene.
When electronic equipment detects that preview graph is backlight image, i.e., when present filming scene is backlight scene, electronic equipment
The exposure parameter of a two field picture in multiframe preview image can be improved.Above-mentioned exposure parameter is the ginseng for adjusting image exposure amount
Count, concretely sensitivity ISO.ISO represents charge coupled cell (Charge-coupled Device, CCD) in electronic equipment
Or the photosensitive speed of complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS)
Degree, electronic equipment can adjust ISO by adjusting the sensitivity of sensor devices or merging sensitivity speck.When ISO increases, image is bright
Degree improves, and when ISO is reduced, brightness of image reduces.Electronic equipment can adjust the brightness of image by adjusting ISO.
The exposure parameter that electronic equipment improves a two field picture in multiframe preview image refers in the multiframe preview continuously acquired
In image, electronic equipment improves the exposure parameter of a wherein two field picture, and then improves the brightness of this two field picture.Electronic equipment exists
When improving exposure parameter, ISO values directly can be transferred to maximum, that is, adjust image to most bright state.
Step 204, to improve exposure parameter image carry out recognition of face, detection improve exposure parameter image in whether
Face to be captured be present.
Electronic equipment can carry out recognition of face to the image for improving exposure parameter, and detection, which is improved in the image of exposure parameter, is
No face to be captured to be present, i.e. electronic equipment can carry out recognition of face to image after improving brightness, after detecting above-mentioned raising brightness
Whether include face in image.When electronic equipment detects face after above-mentioned raising brightness in image, can further detect
Whether above-mentioned face is face to be captured, and above-mentioned face to be captured shoots face corresponding to main body.Electronic equipment can pass through people
The position of face and the area of face determine whether above-mentioned face is face to be captured.Specifically include：Electronic equipment is detecting figure
As in after face, the number of pixels in image shared by human face region can be obtained as face area.When face location position in image
When image intermediate region, can determine that face is face to be captured；When face area is more than specified threshold in image, can determine that
Face is face to be captured.I.e. when face is in image intermediate region in image, face is face to be captured in image；Work as figure
As in face apart from electronic equipment it is nearer when, face is face to be captured in image.
Step 206, if face to be captured be present in the image of raising exposure parameter, the exposure parameter of electronic equipment is adjusted.
When face to be captured be present in the image for detecting raising exposure parameter, electronic equipment can adjust exposure parameter,
Specially electronic equipment adjustment ISO values so that face imaging to be captured is bright, clear in image.Wherein, electronic equipment can basis
The grey level histogram of image adjusts ISO values, and electronic equipment also can adjust ISO values according to the brightness value of current scene.
Method in the embodiment of the present application, under backlight scene, joined by the exposure that a two field picture is improved in multiple image
Number, that is, improve exposure.Detection, which is improved in exposure image, whether there is face, face be present when improving in exposure image,
Then electronic equipment adjustment exposure.The above method, by improving the exposure of a two field picture in multiple image, electronics can be saved
The power consumption of equipment；After face is detected, the exposure of electronic equipment is adjusted.It may be such that face is imaged in backlight scene hypograph
It is bright, clear, improve the image quality of image.
In one embodiment, the exposure parameter of a two field picture in multiframe preview image is improved in step 202 including following
Any one in method：
(1) exposure parameter of a two field picture is improved according to default time interval.
(2) after the preview image of default frame number is got, the exposure parameter of next two field picture is improved.
After it is backlight scene that electronic equipment, which detects current scene, electronic equipment can improve a frame in multiframe preview image
The exposure parameter of image.Concretely：Electronic equipment improves the exposure parameter of a two field picture according to default time interval.Example
Such as, electronic equipment can be every 10 seconds exposure parameters for improving a two field picture.Electronic equipment can get the pre- of default frame number
Look at after image, then improve the exposure parameter of next two field picture.For example, electronic equipment after 30 frame preview images are got, improves
The exposure parameter of next two field picture.I.e. electronic equipment improves the exposure parameter of a two field picture every 30 frames.
Method in the embodiment of the present application, under backlight scene, by improving the exposure parameter of a two field picture in multiple image,
Both saved the power consumption of electronic equipment, be advantageous to again in image detection current scene of the electronic equipment by improving exposure whether
Face be present.
In one embodiment, the exposure parameter of electronic equipment is adjusted in step 206 to be included：If electronic equipment takes the photograph shifting to be double
Dynamic terminal, adjusts the exposure parameter of the camera of electronic equipment first and the exposure parameter of second camera respectively.
The above method also includes：If receiving shooting instruction, the first image, second camera are shot using the first camera
Shoot the second image；First image and the second image co-registration are handled.
When electronic equipment for it is double take the photograph mobile terminal when, mobile terminal can adjust the exposure of the camera of mobile terminal first respectively
The exposure parameter of parameter and second camera.Above-mentioned double mobile terminals of taking the photograph refer to the mobile terminal with two rear cameras.
Mobile terminal is shot after the exposure parameter and the exposure parameter of second camera for adjusting the first camera respectively if receiving
Instruction, the first image can be shot with the first camera, the second image is shot with second camera, then the first figure obtained will be shot
Picture and the processing of the second image co-registration.
In one embodiment, the exposure of the exposure parameter and second camera of the camera of mobile terminal first is adjusted respectively
Parameter includes：
(1) portrait area and background area in preview image are divided.
(2) the first brightness value, the second brightness value of background area of portrait area are obtained respectively.
(3) exposure parameter of the first camera is adjusted according to the first brightness value, according to the shooting of the second brightness value adjustment second
The exposure parameter of head.
Mobile terminal can divide portrait area and background after it face be present in detecting image to the preview image of acquisition
Region.Specifically include：Mobile terminal is identified in image after face by face recognition algorithms, uses region-growing method with face
Middle characteristic point is starting point, obtains portrait area corresponding to face.After portrait area is got, in image in addition to portrait area
Part is background area.
After portrait area in dividing image and background area, mobile terminal can obtain respectively portrait area brightness value and
The brightness value of background area.Wherein, mobile terminal can the Y-component according to corresponding to portrait area in YUV color spaces determine brightness
Value, mobile terminal can the Y-component according to corresponding to background area in YUV color spaces determine brightness value, not limited to this.Mobile terminal
After the first brightness value of portrait area is got, the exposure parameter of the first camera can be adjusted according to the first brightness value, that is, is moved
The dynamic camera of terminal first adjustment ISO is made one as regional imaging is bright, clear.Mobile terminal is getting the second of background area
After brightness value, the exposure parameter of second camera, i.e. mobile terminal second camera adjustment ISO can be adjusted according to the second brightness value
Make background area imaging bright, clear.
Wherein, when shooting the first image using the first camera, mobile terminal can focus mobile terminal to human face region；
When shooting the second image using second camera, mobile terminal can focus mobile terminal to background area.
Mobile terminal can be handled the first image and the second image co-registration after the first image and the second image is got.
Concretely, mobile terminal is by background area fusion treatment in portrait area in the first image and the second image.Further, move
Dynamic terminal can carry out transition processing to the combination of edge of background area in portrait area in the first image and the second image.
Method in the embodiment of the present application, under backlight scene, using dual camera in mobile terminal to portrait area in image
Domain and background area adjust exposure parameter respectively, then the image shot respectively is synthesized, and may be such that the portrait area under backlight scene
It is bright, clear that domain is imaged with background area, improves the quality of image.
In one embodiment, after step 206, the above method also includes：
Step 208, if electronic equipment is singly takes the photograph mobile terminal, according in the image for improving exposure parameter portrait area it is bright
Angle value adjusts exposure parameter, shoots the 3rd image.
Step 210, exposure parameter is adjusted according to the brightness value of background area in the image for improving exposure parameter again, shot
4th image.
Step 212, the 3rd image and the 4th image co-registration are handled.
When electronic equipment for when singly taking the photograph mobile terminal, mobile terminal can be continuously shot two images, then two images are closed
Into.Above-mentioned mobile terminal of singly taking the photograph refers to the mobile terminal with a rear camera.Mobile terminal is deposited in image is detected
After face, portrait area and background area can be divided to the preview image of acquisition.Specifically include：Mobile terminal is known by face
Other algorithm is identified in image after face, uses region-growing method using characteristic point in face as starting point, obtains people corresponding to face
As region.After portrait area is got, the part in image in addition to portrait area is background area.The people in image is divided
Behind region and background area, mobile terminal can obtain the brightness value of portrait area and the brightness value of background area respectively.Wherein,
Mobile terminal can the Y-component according to corresponding to portrait area in YUV color spaces determine brightness value, mobile terminal can be according to background area
Domain determines brightness value, not limited to this in Y-component corresponding to YUV color spaces.Mobile terminal can be first according to the brightness of portrait area
The exposure parameter of value adjustment camera, i.e. mobile terminal adjustment camera ISO make it that portrait area imaging is bright.Wherein, it is mobile
When shooting three images, mobile terminal can focus terminal to human face region.After the 3rd image is shot, mobile terminal can basis
The exposure parameter of the brightness value adjustment camera of background area, i.e. mobile terminal adjustment camera ISO cause background area to be imaged
It is bright, clear.Wherein, when shooting four images, mobile terminal can focus mobile terminal to background area.
Mobile terminal can be handled the 3rd image and the 4th image co-registration after the 3rd image and the 4th image is got.
Concretely, mobile terminal is by background area fusion treatment in portrait area in the 3rd image and the 4th image.Further, move
Dynamic terminal can carry out transition processing to the combination of edge of background area in portrait area in the 3rd image and the 4th image.
Method in the embodiment of the present application, under backlight scene, exposure is adjusted respectively to portrait area in image and background area
Optical parameter, that is, synthesized after adjusting exposure in shooting image, then by the image of shooting, may be such that the portrait area under backlight scene
It is bright, clear to be imaged with background area, improves the quality of image.
In one embodiment, recognition of face is carried out to the image for improving exposure parameter in step 204, detection improves exposure
Include in the image of parameter with the presence or absence of face to be captured：
(1) detection, which is improved in the image of exposure parameter, whether there is face.
(2) when face be present in the image for improving exposure parameter, the area of face and the position of face are obtained.
(3) detect whether face is face to be captured according to the position of the area of face and face.
Electronic equipment can be by whether there is face in the recognizer detection image of the human world.When electronic equipment detects image
In face be present after, can determine whether above-mentioned face is face to be captured by the position of face and the area of face.Specific bag
Include：Electronic equipment can obtain the number of pixels in image shared by human face region as people's face after face in detecting image
Product.When face location is located at image intermediate region in image, can determine that face is face to be captured；When face area in image
During more than specified threshold, can determine that face is face to be captured.I.e. when face is in image intermediate region in image, in image
Face is face to be captured；When face is nearer apart from electronic equipment in image, face is face to be captured in image.
Method in the embodiment of the present application, after it face be present during electronic equipment detects image, further analyze in image
Whether face is face to be captured.Be advantageous to the exposure that electronic equipment improves image when detecting face to be captured, avoid
The increased situation of powder consumption of electronic equipment that face just improves exposure and brought is detected in the picture.
In one embodiment, after step 206, the above method also includes：
Step 214, if receiving shooting instruction, according to adjustment post-exposure parameter shooting image.
Step 216, the grey level histogram of shooting image is obtained, the exposure that electronic equipment is adjusted according to grey level histogram is joined
Number.
Electronic equipment is after shooting instruction is received, according to adjustment post-exposure parameter shooting image.Electronic equipment is obtaining
After shooting image, the grey level histogram of shooting image can be further obtained.In above-mentioned grey level histogram, electronic equipment can obtain
Distribution situation of the shooting image pixel in each gray level.Can prestore intensity histogram corresponding to multiple standard pictures in electronic equipment
Figure, electronic equipment can make comparisons the grey level histogram of shooting image with the grey level histogram of standard picture, if matching degree is less than
Predetermined threshold value, then adjust the exposure parameter of electronic equipment.Wherein, when the pixel that very dark gray level is in grey level histogram is more
When, electronic equipment ISO is increased；When the pixel that incandescent gray level is in grey level histogram is more, electronic equipment ISO is dropped
It is low.
Method in the embodiment of the present application, the exposure parameter of electronic equipment is further adjusted according to shooting image, is set in electronics
On the basis of standby adjust automatically exposure parameter, by way of software analysis image information, to the further correction of exposure parameter, carry
The high accuracy of electronic equipment adjustment exposure parameter, improve the quality of image.
Fig. 5 is the structured flowchart of exposure parameter adjusting apparatus in one embodiment.As shown in figure 5, a kind of exposure parameter is adjusted
Engagement positions, including：
First adjusting module 502, if detecting, present filming scene is backlight scene, is carried after obtaining the image of default frame number
The exposure parameter of high next two field picture.
Identification module 504, for carrying out recognition of face to the image for improving exposure parameter, detection improves the figure of exposure parameter
It whether there is face to be captured as in.
Second adjusting module 506, if for improve exposure parameter image in face be present, adjust the exposure of electronic equipment
Parameter.
In one embodiment, the first adjusting module 502 improves the exposure parameter bag of a two field picture in multiframe preview image
Include any one in following methods：(1) exposure parameter of a two field picture is improved according to default time interval.(2) when getting
After the preview image of default frame number, the exposure parameter of next two field picture is improved.
In one embodiment, identification module 504 carries out recognition of face to the image for improving exposure parameter, and detection, which improves, to expose
Include in the image of optical parameter with the presence or absence of face to be captured：Detection, which is improved in the image of exposure parameter, whether there is face；When
Improve in the image of exposure parameter and face be present, obtain the area of face and the position of face；According to the area and face of face
Position detection face whether be face to be captured.
Fig. 6 is the structured flowchart of exposure parameter adjusting apparatus in another embodiment.A kind of as shown in fig. 6, exposure parameter
Adjusting apparatus, including：First adjusting module 602, identification module 604, the second adjusting module 606, image taking module 608, melt
Matched moulds block 610.Wherein, the first adjusting module 602, identification module 604, the second adjusting module 606 module work(corresponding with Fig. 5
Can be identical.
The exposure parameter of second adjusting module 606 adjustment electronic equipment includes：If electronic equipment takes the photograph mobile terminal to be double, point
Tiao Zheng not the exposure parameter of the camera of electronic equipment first and the exposure parameter of second camera；
Image taking module 608, if for receiving shooting instruction, the first image, second are shot using the first camera
Camera shoots the second image.
Fusion Module 610, for the first image and the second image co-registration to be handled.
In one embodiment, the second adjusting module 606 adjust respectively the camera of electronic equipment first exposure parameter and
The exposure parameter of second camera includes：Divide portrait area and background area in preview image；Portrait area is obtained respectively
First brightness value, the second brightness value of background area；The exposure parameter of the first camera is adjusted according to the first brightness value, according to the
Two brightness values adjust the exposure parameter of second camera.
In one embodiment, if image taking module 608 is additionally operable to electronic equipment singly to take the photograph mobile terminal, according to raising
The brightness value adjustment exposure parameter of portrait area, shoots the 3rd image in the image of exposure parameter；According to raising exposure parameter
The brightness value of background area adjusts exposure parameter again in image, shoots the 4th image.Fusion Module 610 is additionally operable to the 3rd figure
Picture and the processing of the 4th image co-registration.
In one embodiment, if image taking module 608 is additionally operable to receive shooting instruction, according to adjustment post-exposure ginseng
Number shooting image.Second adjusting module 606 is additionally operable to obtain the grey level histogram of shooting image, and electricity is adjusted according to grey level histogram
The exposure parameter of sub- equipment.
The division of modules is only used for for example, in other embodiments in above-mentioned exposure parameter adjusting apparatus, can
Exposure parameter adjusting apparatus is divided into different modules as required, with complete the whole of above-mentioned exposure parameter adjusting apparatus or
Partial function.
The embodiment of the present application additionally provides a kind of computer-readable recording medium.One or more can perform comprising computer
The non-volatile computer readable storage medium storing program for executing of instruction, when computer executable instructions are executed by one or more processors,
So that computing device following steps：
(1) if detecting, present filming scene is backlight scene, improves the exposure ginseng of a two field picture in multiframe preview image
Number.
(2) recognition of face is carried out to the image for improving exposure parameter, detection improves whether there is in the image of exposure parameter
Face to be captured.
(3) if face to be captured be present in the image of raising exposure parameter, the exposure parameter of electronic equipment is adjusted.
In one embodiment, improving the exposure parameter of a two field picture in multiframe preview image is included in following methods arbitrarily
It is a kind of：
(1) exposure parameter of a two field picture is improved according to default time interval.
(2) after the preview image of default frame number is got, the exposure parameter of next two field picture is improved.
In one embodiment, adjusting the exposure parameter of electronic equipment includes：If electronic equipment takes the photograph mobile terminal to be double, point
Tiao Zheng not the exposure parameter of the camera of electronic equipment first and the exposure parameter of second camera.Processor also performs：If receive
Instructed to shooting, the first image is shot using the first camera, second camera shoots the second image；By the first image and second
Image co-registration processing.
In one embodiment, the exposure of the exposure parameter and second camera of the camera of electronic equipment first is adjusted respectively
Parameter includes：Divide portrait area and background area in preview image；The first brightness value, the background area of portrait area are obtained respectively
Second brightness value in domain；The exposure parameter of the first camera is adjusted according to the first brightness value, second is adjusted according to the second brightness value
The exposure parameter of camera.
In one embodiment, also perform：If electronic equipment is singly takes the photograph mobile terminal, according to the image for improving exposure parameter
The brightness value adjustment exposure parameter of middle portrait area, shoots the 3rd image；According to background area in the image for improving exposure parameter
Brightness value adjust exposure parameter again, shoot the 4th image；3rd image and the 4th image co-registration are handled.
In one embodiment, recognition of face is carried out to the image for improving exposure parameter, detection improves the figure of exposure parameter
Include as in the presence or absence of face to be captured：Detection, which is improved in the image of exposure parameter, whether there is face；Join when improving exposure
Face be present in several images, obtain the area of face and the position of face；Detected according to the position of the area of face and face
Whether face is face to be captured.
In one embodiment, also perform：If receiving shooting instruction, according to adjustment post-exposure parameter shooting image；Obtain
The grey level histogram of shooting image is taken, the exposure parameter of electronic equipment is adjusted according to grey level histogram.
The application also provides a kind of computer program product for including instruction, when above computer program product is in computer
During upper operation so that computer performs following steps：
(1) if detecting, present filming scene is backlight scene, improves the exposure ginseng of a two field picture in multiframe preview image
Number.
(2) recognition of face is carried out to the image for improving exposure parameter, detection improves whether there is in the image of exposure parameter
Face to be captured.
(3) if face to be captured be present in the image of raising exposure parameter, the exposure parameter of electronic equipment is adjusted.
In one embodiment, improving the exposure parameter of a two field picture in multiframe preview image is included in following methods arbitrarily
It is a kind of：
(1) exposure parameter of a two field picture is improved according to default time interval.
(2) after the preview image of default frame number is got, the exposure parameter of next two field picture is improved.
In one embodiment, adjusting the exposure parameter of electronic equipment includes：If electronic equipment takes the photograph mobile terminal to be double, point
Tiao Zheng not the exposure parameter of the camera of electronic equipment first and the exposure parameter of second camera.Processor also performs：If receive
Instructed to shooting, the first image is shot using the first camera, second camera shoots the second image；By the first image and second
Image co-registration processing.
In one embodiment, the exposure of the exposure parameter and second camera of the camera of electronic equipment first is adjusted respectively
Parameter includes：Divide portrait area and background area in preview image；The first brightness value, the background area of portrait area are obtained respectively
Second brightness value in domain；The exposure parameter of the first camera is adjusted according to the first brightness value, second is adjusted according to the second brightness value
The exposure parameter of camera.
In one embodiment, also perform：If electronic equipment is singly takes the photograph mobile terminal, according to the image for improving exposure parameter
The brightness value adjustment exposure parameter of middle portrait area, shoots the 3rd image；According to background area in the image for improving exposure parameter
Brightness value adjust exposure parameter again, shoot the 4th image；3rd image and the 4th image co-registration are handled.
In one embodiment, recognition of face is carried out to the image for improving exposure parameter, detection improves the figure of exposure parameter
Include as in the presence or absence of face to be captured：Detection, which is improved in the image of exposure parameter, whether there is face；Join when improving exposure
Face be present in several images, obtain the area of face and the position of face；Detected according to the position of the area of face and face
Whether face is face to be captured.
In one embodiment, also perform：If receiving shooting instruction, according to adjustment post-exposure parameter shooting image；Obtain
The grey level histogram of shooting image is taken, the exposure parameter of electronic equipment is adjusted according to grey level histogram.
So that electronic equipment is mobile terminal as an example, the embodiment of the present application also provides a kind of mobile terminal.Above-mentioned mobile terminal
Include image processing circuit, image processing circuit can utilize hardware and/or component software to realize, it may include define ISP
The various processing units of (Image Signal Processing, picture signal processing) pipeline.Fig. 7 is to scheme in one embodiment
As the schematic diagram of process circuit.As shown in fig. 7, for purposes of illustration only, the image procossing skill related to the embodiment of the present application is only shown
The various aspects of art.
As shown in fig. 7, image processing circuit includes ISP processors 740 and control logic device 750.Imaging device 710 is caught
View data handled first by ISP processors 740, ISP processors 740 view data is analyzed with catch can be used for it is true
The image statistics of fixed and/or imaging device 710 one or more control parameters.Imaging device 710 may include there is one
The camera of individual or multiple lens 712 and imaging sensor 714.Imaging sensor 714 may include colour filter array (such as
Bayer filters), imaging sensor 714 can obtain the luminous intensity caught with each imaging pixel of imaging sensor 714 and wavelength
Information, and the one group of raw image data that can be handled by ISP processors 740 is provided.Sensor 720 (such as gyroscope) can be based on passing
The parameter (such as stabilization parameter) of the image procossing of collection is supplied to ISP processors 740 by the interface type of sensor 720.Sensor 720
Interface can utilize SMIA (Standard Mobile Imaging Architecture, Standard Mobile Imager framework) interface,
The combination of other serial or parallel camera interfaces or above-mentioned interface.
In addition, raw image data can also be sent to sensor 720 by imaging sensor 714, sensor 720 can be based on passing
The interface type of sensor 720 is supplied to ISP processors 740, or sensor 720 to deposit raw image data raw image data
Store up in video memory 730.
ISP processors 740 handle raw image data pixel by pixel in various formats.For example, each image pixel can
Bit depth with 8,10,12 or 14 bits, ISP processors 740 can be carried out at one or more images to raw image data
Reason operation, statistical information of the collection on view data.Wherein, image processing operations can be by identical or different bit depth precision
Carry out.
ISP processors 740 can also receive view data from video memory 730.For example, the interface of sensor 720 will be original
View data is sent to video memory 730, and the raw image data in video memory 730 is available to ISP processors 740
It is for processing.Video memory 730 can be independent special in the part of storage arrangement, storage device or electronic equipment
With memory, and it may include DMA (Direct Memory Access, direct direct memory access (DMA)) feature.
When receiving from the interface of imaging sensor 714 or from the interface of sensor 720 or from video memory 730
During raw image data, ISP processors 740 can carry out one or more image processing operations, such as time-domain filtering.Figure after processing
As data can be transmitted to video memory 730, to carry out other processing before shown.ISP processors 740 are from image
The reception processing data of memory 730, and the image in original domain and in RGB and YCbCr color spaces is carried out to processing data
Data processing.View data after the processing of ISP processors 740 may be output to display 770, so that user watches and/or by scheming
Shape engine or GPU (Graphics Processing Unit, graphics processor) are further handled.In addition, ISP processors 740
Output also can be transmitted to video memory 730, and display 770 can read view data from video memory 730.At one
In embodiment, video memory 730 can be configured as realizing one or more frame buffers.In addition, ISP processors 740 is defeated
Go out can be transmitted to encoder/decoder 760, so as to encoding/decoding image data.The view data of coding can be saved, and
Decompressed before being shown in the equipment of display 770.Encoder/decoder 760 can be realized by CPU or GPU or coprocessor.
The statistics that ISP processors 740 determine, which can be transmitted, gives the unit of control logic device 750.For example, statistics can wrap
Include the image sensings such as automatic exposure, AWB, automatic focusing, flicker detection, black level compensation, the shadow correction of lens 712
The statistical information of device 714.Control logic device 750 may include the processor and/or micro-control for performing one or more routines (such as firmware)
Device processed, one or more routines according to the statistics of reception, can determine the control parameter and ISP processors of imaging device 710
740 control parameter.For example, the control parameter of imaging device 710 may include the control parameter of sensor 720 (such as gain, exposure
Time of integration of control, stabilization parameter etc.), camera flash control parameter, the control parameter of lens 712 (such as focus on or zoom
With focal length) or these parameters combination.ISP control parameters may include to be used for AWB and color adjustment (for example, in RGB
During processing) gain level and color correction matrix, and the shadow correction parameter of lens 712.
It it is below the step of realizing exposure parameter method of adjustment with image processing techniques in Fig. 7：
(1) if detecting, present filming scene is backlight scene, improves the exposure ginseng of a two field picture in multiframe preview image
Number.
(2) recognition of face is carried out to the image for improving exposure parameter, detection improves whether there is in the image of exposure parameter
Face to be captured.
(3) if face to be captured be present in the image of raising exposure parameter, the exposure parameter of electronic equipment is adjusted.
In one embodiment, improving the exposure parameter of a two field picture in multiframe preview image is included in following methods arbitrarily
It is a kind of：
(1) exposure parameter of a two field picture is improved according to default time interval.
(2) after the preview image of default frame number is got, the exposure parameter of next two field picture is improved.
In one embodiment, adjusting the exposure parameter of electronic equipment includes：If electronic equipment takes the photograph mobile terminal to be double, point
Tiao Zheng not the exposure parameter of the camera of electronic equipment first and the exposure parameter of second camera.Processor also performs：If receive
Instructed to shooting, the first image is shot using the first camera, second camera shoots the second image；By the first image and second
Image co-registration processing.
In one embodiment, the exposure of the exposure parameter and second camera of the camera of electronic equipment first is adjusted respectively
Parameter includes：Divide portrait area and background area in preview image；The first brightness value, the background area of portrait area are obtained respectively
Second brightness value in domain；The exposure parameter of the first camera is adjusted according to the first brightness value, second is adjusted according to the second brightness value
The exposure parameter of camera.
In one embodiment, also perform：If electronic equipment is singly takes the photograph mobile terminal, according to the image for improving exposure parameter
The brightness value adjustment exposure parameter of middle portrait area, shoots the 3rd image；According to background area in the image for improving exposure parameter
Brightness value adjust exposure parameter again, shoot the 4th image；3rd image and the 4th image co-registration are handled.
In one embodiment, recognition of face is carried out to the image for improving exposure parameter, detection improves the figure of exposure parameter
Include as in the presence or absence of face to be captured：Detection, which is improved in the image of exposure parameter, whether there is face；Join when improving exposure
Face be present in several images, obtain the area of face and the position of face；Detected according to the position of the area of face and face
Whether face is face to be captured.
In one embodiment, also perform：If receiving shooting instruction, according to adjustment post-exposure parameter shooting image；Obtain
The grey level histogram of shooting image is taken, the exposure parameter of electronic equipment is adjusted according to grey level histogram.
Any reference to memory, storage, database or other media used in this application may include non-volatile
And/or volatile memory.Suitable nonvolatile memory may include read-only storage (ROM), programming ROM (PROM),
Electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include arbitrary access
Memory (RAM), it is used as external cache.By way of illustration and not limitation, RAM is available in many forms, such as
It is static RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDR SDRAM), enhanced
SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM).
Above example only expresses the several embodiments of the application, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the application the scope of the claims.It should be pointed out that for the person of ordinary skill of the art,
On the premise of the application design is not departed from, various modifications and improvements can be made, these belong to the protection model of the application
Enclose.Therefore, the protection domain of the application patent should be determined by the appended claims.
Claims (10)
- A kind of 1. exposure parameter method of adjustment, it is characterised in that including：If it is backlight scene to detect present filming scene, the exposure parameter of a two field picture in multiframe preview image is improved；Recognition of face is carried out to the image for improving exposure parameter, detects to whether there is in the image for improving exposure parameter and waits to clap Take the photograph face；If face to be captured be present in the image for improving exposure parameter, the exposure parameter of electronic equipment is adjusted.
- 2. according to the method for claim 1, it is characterised in that the exposure for improving a two field picture in multiframe preview image Parameter includes any one in following methods：The exposure parameter of a two field picture is improved according to default time interval；After the preview image of default frame number is got, the exposure parameter of next two field picture is improved.
- 3. according to the method for claim 1, it is characterised in that the exposure parameter of the adjustment electronic equipment includes：If the electronic equipment takes the photograph mobile terminal to be double, the exposure parameter and the of the camera of mobile terminal first is adjusted respectively The exposure parameter of two cameras；Methods described also includes：If receiving shooting instruction, the first image is shot using first camera, the second camera shoots the second figure Picture；Described first image and the second image co-registration are handled.
- 4. the method according to right will go 3, it is characterised in that described to adjust the camera of mobile terminal first respectively The exposure parameter of exposure parameter and second camera includes：Divide portrait area and background area in preview image；The first brightness value, the second brightness value of background area of the portrait area are obtained respectively；The exposure parameter of first camera is adjusted according to first brightness value, according to second brightness value adjustment The exposure parameter of second camera.
- 5. according to the method for claim 1, it is characterised in that methods described also includes：If the electronic equipment is singly takes the photograph mobile terminal, according to the brightness value of portrait area in the image of the raising exposure parameter Exposure parameter is adjusted, shoots the 3rd image；Exposure parameter is adjusted according to the brightness value of background area in the image of the raising exposure parameter again, shoots the 4th figure Picture；3rd image and the 4th image co-registration are handled.
- 6. method according to any one of claim 1 to 5, it is characterised in that the image of described pair of raising exposure parameter Recognition of face is carried out, detect includes in the image for improving exposure parameter with the presence or absence of face to be captured：Detect in the image of the raising exposure parameter and whether there is face；When face be present in the image of the raising exposure parameter, the area of the face and the position of face are obtained；Detect whether the face is face to be captured according to the position of the area of the face and face.
- 7. method according to any one of claim 1 to 5, it is characterised in that also include：If receiving shooting instruction, according to adjustment post-exposure parameter shooting image；The grey level histogram of the shooting image is obtained, the exposure parameter of electronic equipment is adjusted according to the grey level histogram.
- A kind of 8. exposure parameter adjusting apparatus, it is characterised in that including：First adjusting module, if detecting, present filming scene is backlight scene, is improved after the image of the default frame number of acquisition next The exposure parameter of two field picture；Identification module, for carrying out recognition of face to the image for improving exposure parameter, detect the image for improving exposure parameter In whether there is face to be captured；Second adjusting module, if for face be present in the image for improving exposure parameter, adjust the exposure ginseng of electronic equipment Number.
- 9. a kind of electronic equipment, including memory and processor, computer-readable instruction, the finger are stored in the memory When order is by the computing device so that method of the computing device as any one of claim 1 to 7.
- 10. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the computer program The method as any one of claim 1 to 7 is realized when being executed by processor.
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