CN106791809A

CN106791809A - A kind of light measuring method and mobile terminal

Info

Publication number: CN106791809A
Application number: CN201611151717.1A
Authority: CN
Inventors: 殷求明
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2016-12-14
Filing date: 2016-12-14
Publication date: 2017-05-31
Anticipated expiration: 2036-12-14
Also published as: CN106791809B

Abstract

The invention provides a kind of light measuring method and mobile terminal, wherein method is applied to include the mobile terminal of the first camera and second camera, including：During first camera collection preview image is exported to preview interface of taking pictures, the target photometry region of the preview image is obtained；Target field depth where obtaining the target photometry region that the second camera is detected；Based on the target field depth, the light metering weight of the preview image is adjusted；The light metering weight after based on adjustment, light-metering is carried out to the preview image, improves the accuracy of light-metering, the photometric data of more realistic imaging demand is obtained, to realize follow-up reasonable exposure, it is ensured that effect of taking pictures.

Description

A kind of light measuring method and mobile terminal

Technical field

The present invention relates to communication technical field, more particularly to a kind of light measuring method and mobile terminal.

Background technology

The photometric system of digital camera, is light intensity --- the TTL that subject reflection is measured by camera lens (Through The Lens) light-metering.Light-metering inductor is placed in light path of photography, light unit from mirror reflection to light-metering Light-metering is carried out on part.The light intensity data for measuring is transferred in the processor of camera, by the calculating process of automatic exposure after, certainly Exposure combination is made, that is, the aperture for shooting is combined with shutter speed, the diaphragm shutter value for then being provided by camera is taken pictures, The accurate photo of exposure can be shot.

The difference of different zones, size and calculating weight according to light-metering inductor to being measured in viewfinder range, surveys Light mode can be divided into average metering, central heavy spot light-metering, spot light-metering, matrix light-metering isotype.

Wherein, the photometric range of spot light-metering is the region that view finder picture center accounts for whole picture about 1%-3% areas, point Light-metering is not influenceed by outer other scene brightness of photometry region substantially, therefore can be easily using spot light-metering to subject Or the regional of background is detected, and spot light-metering has sensitivity higher and precision, can fully show whole picture The light reaction in face.With the maturation of touch-screen and extensive use, on camera and intelligent terminal equipped with touch-screen, Yong Huke To select the specific region of spot light-metering by touch-screen, rather than must be carried out to middle position, this is also greatly improved a little The effect of light-metering and ease for use.

In correlation technique, when light-metering is carried out by the way of spot light-metering, light-metering point need to be first confirmd that, then with the light-metering point Centered on, a rectangle or border circular areas are done, the rectangle or border circular areas account for the area of the 1%-3% of whole preview interface.So And, this Exposure Metering directly carries out light-metering by photometry region of a selection area, for selection area outside need also exist for The light-metering and exposure for carrying out the part of clear display cause bad influence, and the picture taken is not that overexposure is exactly to owe exposure, is caused Serious exposure error, it is impossible to meet picture photographing demand.

The content of the invention

A kind of light measuring method and mobile terminal are provided in the embodiment of the present invention, exposure is easily caused to solve existing light-metering Error, it is impossible to meet the problem of picture photographing demand.

On the one hand, the embodiment of the present invention provides a kind of light measuring method, is applied to include the first camera and second camera Mobile terminal, including：

During first camera collection preview image is exported to preview interface of taking pictures, the preview graph is obtained The target photometry region of picture；

Target field depth where obtaining the target photometry region that the second camera is detected；

Based on the target field depth, the light metering weight of the preview image is adjusted；

The light metering weight after based on adjustment, light-metering is carried out to the preview image.

On the other hand, the embodiment of the present invention also provides a kind of mobile terminal, including the first camera and second camera, also Including：

First acquisition module, for being exported to the process of preview interface of taking pictures in first camera collection preview image In, obtain the target photometry region of the preview image；

Second acquisition module, for obtaining described in first acquisition module acquisition that the second camera is detected Target field depth where target photometry region；

Adjusting module, for the target field depth obtained based on second acquisition module, adjusts the preview The light metering weight of image；

Light-metering module, for based on the light metering weight after adjusting module adjustment, being carried out to the preview image Light-metering.

So, during by being exported to preview interface of taking pictures in the first camera collection preview image, this is obtained pre- Look at the target photometry region of image, and the target field depth where obtaining the target photometry region that second camera is detected, Based on the target field depth, the light metering weight of preview image is adjusted, it is final to realize based on the light metering weight after adjustment, to preview Image carries out light-metering, the process, by the cooperation between two cameras, obtains target photometry region in preview image and image Place target field depth, based on the field depth where target photometry region, to the light-metering power of overall preview image It is adjusted again, the light-metering strategy of entire scope is determined with the field depth information of subrange, realizes in preview image There is the reference object of difference, carry out differentiated light-metering operation with differentiated light metering weight in locus, it is ensured that light-metering Accuracy, lifts light-metering effect.

Brief description of the drawings

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.

Fig. 1 represents the flow chart of light measuring method in first embodiment of the invention；

Fig. 2 represents the flow chart of light measuring method in second embodiment of the invention；

Fig. 3 represents the flow chart of light measuring method in third embodiment of the invention；

Fig. 4 represents the flow chart of light measuring method in fourth embodiment of the invention；

Fig. 5 represents the structured flowchart one of mobile terminal in fifth embodiment of the invention；

Fig. 6 represents the structured flowchart two of mobile terminal in fifth embodiment of the invention；

Fig. 7 represents the structured flowchart of mobile terminal in sixth embodiment of the invention；

Fig. 8 represents the structured flowchart of mobile terminal in seventh embodiment of the invention.

Specific embodiment

First embodiment

A kind of light measuring method disclosed in the present embodiment, is applied to include the mobile end of the first camera and second camera End, with reference to shown in Fig. 1, including：

Step 101：During the first camera collection preview image is exported to preview interface of taking pictures, the preview is obtained The target photometry region of image.

When camera is opened, mobile terminal is in preview interface of taking pictures, and camera can be adopted constantly to external sights Collection, obtains preview image, exports to preview interface of taking pictures, and the preview image is shown in preview interface of taking pictures, and this first Camera collection preview image is exported to the process of preview interface of taking pictures, including the first camera is acquired to external sights, Treatment obtains preview image, and preview image is conveyed to display screen, and by the pre- of the first camera collection in preview interface of taking pictures The process that image of looking at shows.

Wherein, the target photometry region is a part for viewing area in preview interface.The acquisition of the target photometry region Can be the automatic acquisition process of mobile terminal, or acquisition process is realized according to the selection of user instruction.Based on the target Photometry region is carrying out ensuing light-metering treatment.

Specifically, as one preferred embodiment, the step of target photometry region of the acquisition preview image, including： Mobile terminal user is in the clicking operation in preview interface of taking pictures for detection；When clicking operation is detected, clicking operation is obtained Position；The preview image being included, the region of the preset first range of the position of the clicking operation is defined as the target Photometry region.

The process, corresponds specifically to user and is exported to preview interface of taking pictures in the first camera collection preview image, takes pictures When showing preview image in preview interface, carry out clicking on the situation for choosing target area, this time shift in preview interface of taking pictures Dynamic terminal is detecting user when the clicking operation in preview interface is taken pictures, you can obtain the target light-metering area selected by user Domain, the generation position of clicking operation described in the target photometry region is clicked on automatically according to user and obtains target area, makes target The actual demand for being determined for compliance with user of photometry region.

Specifically, as it is another preferred embodiment, the step of the target photometry region of the acquisition preview image, bag Include：The region of the preset second range in preview image is defined as target photometry region.

The process, specially directly carries out area locking in the preview image of target photometry region, the target light-metering area Domain can be specifically a default default zone in systems, and the region of the preset second range can be for display screen just Central area, to meet conventional photographing operation, the automatic selection area of system makes light-metering process simple to use.

Specifically, as it is another preferred embodiment, the step of the target photometry region of the acquisition preview image, bag Include：Face datection is carried out to preview image；When face is detected, the region where face is defined as target photometry region.

The process, specific to light-metering demand when user is to portrait, directly by human face region in preview image Can be automatically and efficiently main with human face region when can make in reference object comprising personage as target photometry region Parameter acquiring region, ensuing contrast matching process is carried out according to the parameter of the human face region, with the people captured by user Thing is attached most importance to, and realizes final face exposure enhancing, is maximized guarantee human face region and is obtained good light-metering effect, to enter One step ensures the final good shooting effect of human face region, meets user's request.

Step 102：Target field depth where obtaining the target photometry region that second camera is detected.

The realization of the process, especially by both second camera and the first camera coordinate, second camera by itself The view data absorbed, can be by two cameras with reference to the view data obtained during the first camera collection preview image The method of triangle polyester fibre between made thing body, obtains the depth of field parameter information of subject in preview image, and then available Target field depth in preview image where target photometry region.

Step 103：Based on the target field depth, the light metering weight of preview image is adjusted.

Because the reference object shown in preview image spatially has position difference all around, on diverse location The depth of field value of reference object there is difference.Wherein, the target field depth is right with shooting shown in target photometry region As corresponding, shown reference object is a part for shown reference object in preview image in target photometry region, Based on the field depth where a part of region, it is adjusted come the light metering weight to overall preview image, with subrange Field depth information determine the light-metering strategy of entire scope, there is the shooting of difference to preview image spatial location in realization Object, differentiated light-metering operation is carried out with differentiated light metering weight, it is ensured that the accuracy of light-metering, lift light-metering effect.

Step 104：Based on the light metering weight after adjustment, light-metering is carried out to preview image.

Based on the target field depth, the light metering weight of the preview image after being adjusted is held according to the light metering weight Final light-metering operation of the row to preview image.

Light measuring method in the embodiment of the present invention, is exported to preview circle of taking pictures by gathering preview image in the first camera During face, the target photometry region of the preview image is obtained, and obtain the target photometry region that second camera is detected The target field depth at place, based on the target field depth, adjusts the light metering weight of preview image, final to realize based on adjustment Light metering weight afterwards, light-metering is carried out to preview image, the process, by the cooperation between two cameras, obtains preview image And in image the place of target photometry region target field depth, based on the field depth where target photometry region, come it is right The light metering weight of overall preview image is adjusted, and the light-metering plan of entire scope is determined with the field depth information of subrange Slightly, realization exist to preview image spatial location difference reference object, carried out with differentiated light metering weight it is differentiated Light-metering is operated, it is ensured that the accuracy of light-metering, lifts light-metering effect, the photometric data of more realistic imaging demand is obtained, with reality Now follow-up reasonable exposure, it is ensured that effect of taking pictures.

Second embodiment

A kind of light measuring method disclosed in the present embodiment, is applied to include the mobile end of the first camera and second camera End, with reference to shown in Fig. 2, including：

Step 201：During the first camera collection preview image is exported to preview interface of taking pictures, preview graph is obtained The target photometry region of picture.

Wherein, the target photometry region is the part of viewing area in preview interface of taking pictures.The target photometry region Acquisition can be the automatic acquisition process of mobile terminal, or realize acquisition process according to the selection of user instruction.Based on this Target photometry region is carrying out ensuing light-metering treatment.

Step 202：Target field depth where obtaining the target photometry region that second camera is detected.

Step 203：The field depth of all pixels point in fringe region in control second camera detection preview image.

Wherein, the fringe region is：All image-regions in addition to target photometry region.

The realization of the process, especially by both second camera and the first camera coordinate, second camera by itself The view data absorbed, can be by two cameras with reference to the view data obtained during the first camera collection preview image The method of triangle polyester fibre between made thing body, obtains the depth of field parameter information of subject in preview image, and then available The corresponding field depth of pixel in all image-regions in preview image in addition to target photometry region.

Step 204：In edge region, at least one object edge area that field depth is the target field depth is extracted Domain.

The step, based on the target field depth where target photometry region, is carried out in the fringe region of preview image Matching, extracts the object edge region that field depth is the target field depth, each at least one object edge region The corresponding depth of field numerical value of pixel is in the target field depth.

Step 205：Photometry region centered on target photometry region and at least one object edge region are determined.

The process, extracts in the target field depth according to where target photometry region, in edge region and obtains the depth of field After scope is at least one object edge region of the target field depth, the target photometry region and at least one object edge Region turns into center photometry region.The center photometry region be preview image in be in identical field depth (target field depth) The region that is constituted of pixel.

The process, the corresponding target field depth of target photometry region that will be selected in preview image as comparison condition, Contrasting the field depth corresponding to the pixel in which region in the display image of the whole preview interface of matching is and the target scape What deep scope was consistent, the viewing area being consistent with the target field depth i.e. centered on photometry region.

For example, corresponding to the kitten and doggie of identical field depth in such as preview image, user clicks kitten, Kitten and doggie so can be carried out into the big light-metering of weight all as center photometry region to center photometry region.By right One region choose, you can the image-region of field depth identical with this region is determined automatically, complete to center The determination and division of photometry region, improve light-metering process accuracy with it is intelligent.

Step 206：All image-regions outside the photometry region of preview image Zhong Chu centers are defined as to aid in photometry region.

Accordingly, the auxiliary photometry region is similarly the part in preview image, after center photometry region is determined, And then residual image region is auxiliary photometry region in obtaining preview image.

Step 207：The light metering weight of adjustment center photometry region and auxiliary photometry region.

Specifically, the weight of the light metering weight less than the center photometry region of the auxiliary photometry region is set.

Wherein, the span of light metering weight is 0-100%.The determination of light metering weight, for the difference obtained to division Region sets different light metering weights, with the light-metering for preview image stress, it is ensured that such as face or Jiao of focusing of taking pictures The important area such as shooting picture at point place can have rationally, have stressing property and more meet the photometric data of actually imaging demand, with Realize follow-up reasonable exposure, it is ensured that effect of taking pictures.

Step 208：Based on the light metering weight after adjustment, light-metering is carried out to preview image.

Based on the target field depth, the light metering weight of the preview image after being adjusted is held according to the light metering weight Light-metering operation of the row to the center photometry region in preview image and auxiliary photometry region.

Wherein, the process of light-metering is carried out to preview image based on the light metering weight after adjustment, specially based on preview image The corresponding monochrome information of pixel is carried out right of execution and is resurveyed light operation in the different areas, in gathering the different zones for determining respectively The corresponding brightness value of pixel, the average brightness in different zones is weighted with the corresponding light metering weight ratio in each region Calculate, obtain photometry result, to realize follow-up luminance compensation, improve the accuracy of light-metering.

Further, wherein, adjustment center photometry region and auxiliary photometry region light metering weight, based on the survey after adjustment Light weight, the implementation process of light-metering is carried out to preview image, to that should have different implementation process.

On the one hand, the step of light metering weight of the adjustment center photometry region and auxiliary photometry region, including：Adjustment center The light metering weight of photometry region is 100%；The light metering weight of adjustment auxiliary photometry region is 0.

Then, the light metering weight after adjustment should be based on, the step of carry out light-metering to preview image, including：According to center The light metering weight 100% of photometry region, the center photometry region to preview image carries out light-metering.

In that case, according to 100% light metering weight, light-metering is carried out to center photometry region, completely with preview In image it is all meet target photometry region where the region of target field depth carry out light-metering, ignore field depth for other The viewing area of scope, light-metering operation is carried out to focus on performance center photometry region, meets the light-metering of taking pictures under particular case Need.

On the one hand, the step of light metering weight of the adjustment center photometry region and auxiliary photometry region, including：Adjustment is described The light metering weight of center photometry region is a%；The light metering weight of the adjustment auxiliary photometry region is b%.

Then, the light metering weight after adjustment should be based on, the step of carry out light-metering to preview image, including：According to the center The light metering weight b% of the light metering weight a% of photometry region and the auxiliary photometry region, to the center photometry region and described Auxiliary photometry region carries out light-metering.

Wherein, 50<a<The span of 100, a+b=100, i.e. light metering weight is 0-100%, by the figure in preview image As region is divided into two, two-part light metering weight sum is 100%.Wherein, the light metering weight of center photometry region is more than auxiliary Help the light metering weight of photometry region.Preferably, a values are preferably 80, b values and are preferably 20.

The process, realization is had any different, is had the division of emphasis to preview image, and light-metering is implemented according to different weights Journey, different zones that can preferably in display picture carry out light-metering, improve the accuracy of light-metering, obtain more realistic The photometric data of imaging demand, to realize follow-up reasonable exposure, it is ensured that effect of taking pictures.

Light measuring method in the embodiment of the present invention, is exported to preview circle of taking pictures by gathering preview image in the first camera During face, the target photometry region of the preview image is obtained, and obtain the target photometry region that second camera is detected In the target field depth and fringe region at place the field depth of all pixels point come determine center photometry region and auxiliary survey Light region and its corresponding light metering weight, it is final to realize, based on the light metering weight after adjustment, light-metering being carried out to preview image, should Process, by the cooperation between two cameras, obtains the target scape at the place of target photometry region in preview image and image Deep scope, based on the field depth where target photometry region, is adjusted, with office come the light metering weight to overall preview image The field depth information of portion's scope determines the light-metering strategy of entire scope, and realization has difference to preview image spatial location Reference object, differentiated light-metering operation is carried out with differentiated light metering weight, it is ensured that the accuracy of light-metering, lifting light-metering effect Really.

3rd embodiment

A kind of light measuring method disclosed in the present embodiment, is applied to include the mobile end of the first camera and second camera End, with reference to shown in Fig. 3, including：

Step 301：During the first camera collection preview image is exported to preview interface of taking pictures, preview graph is obtained The target photometry region of picture.

Step 302：Target field depth where obtaining the target photometry region that second camera is detected.

Step 303：Based on target field depth, the average depth of field c of all pixels point in target photometry region is calculated.

Wherein, there are many pixels in the corresponding target photometry region of the target field depth, each pixel correspondence There is the depth of field numerical value of itself shown portion in preview image, the corresponding depth of field numerical value of those pixels is added and is averaged To the average depth of field, it is worth to by asking mathematic(al) mean.

Step 304：The field depth of all pixels point in fringe region in control second camera detection preview image.

Step 305：In target photometry region and fringe region, it is [c-w that field depth is extracted successively₁,c+w₁]、[c- w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image Region.

Wherein, 0≤w₁<w₂<w₃……<w_n<w_m。

The process, depth of view information according to pixel carries out weight light-metering.All pixels point in target photometry region The average depth of field is c, specifically, for example, can be by the depth of field for the pixel of c assigns highest light-metering weights in light-metering, the depth of field is big In c-5, the pixel less than c+5, secondary light metering weight high is assigned in light-metering, the rest may be inferred, wherein, the corresponding scape of pixel Gap between deep numerical value and c is bigger, and pixel corresponding region is smaller in the weight of light-metering.

Step 306：Adjustment field depth is [c-w respectively₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c- w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image-region light metering weight be m₁%, m₂%, m₃% ... m_n%.

Wherein, m_n<……<m₃<m₂<m₁, m₁%+m₂%+m₃%+ ...+m_n%=100%.

Specifically, the w₁Value can be 0, can be specifically, be 0 when numerical value is differed in preview image between the average depth of field When, it is maximum that the corresponding area metering weight of those pixels is set；Work as w₁Value is 0, w₂When value is 5, corresponding to field depth For [c-5, c) ∪ (c, c+5] image-region, now the depth of field numerical value of pixel is differed between the average depth of field in the image-region Numerical value is in the range of first, i.e., [- 5,0) and ∪ (0,5], the corresponding image-region of the field depth assigns secondary high in light-metering Light metering weight；Similarly, numerical value is differed between the average depth of field in preview image to be in (such as -10~-5, and 5 in the range of second ~pixel corresponding region 10) assigns smaller light metering weight in light-metering, wherein, all numerical value is absolute in the second scope Value is all higher than the absolute value of all numerical value of the first scope, the like, light metering weight is reduced, preferably to carry out according to main body Light-metering, improves the accuracy of light-metering.

For example, including kitten and thick grass in such as preview image, user clicks kitten, then calculate kitten institute The average depth of field c of all pixels point, the depth of field is carried out in image range where kitten and image range where thick grass in the zone The matching of scope, can by preview image be divided into the depth of field be c pixel region set highest light metering weight, by the depth of field with it is average The pixel region that the difference of the depth of field is between 0 ＜ c≤5 sets time weight high, and the depth of field is in into 5 with the difference of the average depth of field Pixel region between ＜ c≤10 sets smaller weight, and the rest may be inferred.Chosen by a region, you can by this The average depth of field is automatically obtained the region division to preview image in region, improve the accuracy of light-metering process with it is intelligent.

Step 307：It is [c-w according to field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪ (c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding light metering weight m of image-region₁%, m₂%, m₃% ... m_n%, is [c-w to field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂, c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering.

Based on the target field depth, the average depth of field of all pixels point in target photometry region is calculated, extracted The different images region in target photometry region and fringe region is obtained, and different light-metering power are adjusted to different images region Weight, finally implements light-metering and operates according to different light metering weights to different images region, and the process, realization has to preview image The division of emphasis is distinguished, had, light-metering process, different zones that can preferably in display picture are implemented according to different weights Light-metering is carried out, the accuracy of light-metering is improved, the photometric data of more realistic imaging demand is obtained, to realize follow-up reasonable exposure Light, it is ensured that effect of taking pictures.

Light measuring method in the embodiment of the present invention, by obtaining the target photometry region of the preview image, and target light-metering Target field depth where region, is calculated the average depth of field of all pixels point in target photometry region, and extraction obtains mesh Different images region in mark photometry region and fringe region, and different light metering weights are adjusted to different images region, finally Realize, based on the light metering weight after adjustment, light-metering being carried out to preview image, the process, by the cooperation between two cameras, The target field depth at the place of target photometry region in preview image and image is obtained, based on the scape where target photometry region Deep scope, is adjusted come the light metering weight to overall preview image, and entirety is determined with the field depth information of subrange The light-metering strategy of scope, realization there is the reference object of difference to preview image spatial location, with differentiated light metering weight Carry out differentiated light-metering operation, it is ensured that the accuracy of light-metering, lift light-metering effect.

Fourth embodiment

A kind of light measuring method disclosed in the present embodiment, is applied to include the mobile end of the first camera and second camera End, with reference to shown in Fig. 4, including：

Step 401：During the first camera collection preview image is exported to preview interface of taking pictures, preview graph is obtained The target photometry region of picture.

Step 402：Target field depth where obtaining the target photometry region that second camera is detected.

Step 403：Based on target field depth, the average depth of field d of all pixels point in target photometry region is calculated.

Step 404：It is determined that the target span residing for average depth of field d.

Being calculated in target photometry region after the average depth of field of all pixels point, determine that the average depth of field d is in Which target span, the determination process of ensuing light metering weight is carried out with the target span according to residing for it.

Step 405：According to default span and the corresponding relation of light metering weight, determine that target span is corresponding Light metering weight s%.

The light metering weight is corresponding with the span residing for average depth of field d, it is determined that the target residing for average depth of field d takes After value scope, from the corresponding relation of span and light metering weight, light metering weight corresponding with target span is obtained.

Wherein, average depth of field d values are bigger, and s% values are also bigger, the size of average depth of field d and the size of light metering weight Positive correlation, when depth of field numerical value is larger, to increase the follow-up exposure compensating to respective regions, improves effect of taking pictures.

Step 406：The light metering weight for determining the fringe region in preview image is t%.

The fringe region is：All image-regions in addition to target photometry region；Wherein s+t=100.The process, will be pre- The image-region look in image is divided into two, and two-part light metering weight sum is 100%.Preferably, s>T, i.e. s values are more than The value of t.

For example, including kitten and thick grass in such as preview image, user clicks kitten, then calculate kitten institute The average depth of field c of all pixels point in the zone, if c is 5, the span in 4≤c ＜ 6, it is determined that the survey in kitten region Light weight be with 4≤c of scope ＜ 6 corresponding 70%, thick grass area metering weight be 30%；If c is 7, in taking for 6≤c ＜ 8 Value scope, it is determined that the light metering weight in kitten region is to be with 6≤c of scope ＜ 8 corresponding 80%, thick grass area metering weight 20%；By that analogy.Chosen by a region, you can determined by the span where the average depth of field in the region Selected areas and the light metering weight in other regions, improve light-metering reasonability with it is intelligent.Step 407：According to center light-metering area The light metering weight s% in the domain and light metering weight t% of fringe region, light-metering is carried out to center photometry region and fringe region.

Wherein, the center photometry region is the target photometry region, the target depth of field where target photometry region is obtained Scope, and the average depth of field d of all pixels point in target photometry region is calculated, it is determined that the target residing for average depth of field d takes Value scope, determines the light metering weight of the corresponding light metering weight s% of target span and fringe region for after t%, you can according to The light metering weight performs the light-metering operation to the center photometry region in preview image and auxiliary photometry region.

Light measuring method in the embodiment of the present invention, by obtaining the target photometry region of the preview image, and target light-metering Target field depth where region, is calculated the average depth of field of all pixels point in target photometry region, and then obtain mesh Different light metering weight in mark photometry region and fringe region, it is final to realize based on the light metering weight after adjustment, to preview image Light-metering is carried out, the process, by the cooperation between two cameras, obtains the institute of target photometry region in preview image and image Target field depth, based on the field depth where target photometry region, enter come the light metering weight to overall preview image Row adjustment, determines the light-metering strategy of entire scope with the field depth information of subrange, realizes to hollow of preview image There is the reference object of difference, differentiated light-metering operation carried out with differentiated light metering weight in position, it is ensured that light-metering it is accurate Property, lift light-metering effect.

5th embodiment

The embodiment of the present invention discloses a kind of mobile terminal, can realize the light measuring method in first embodiment to fourth embodiment Details, and reach identical effect.Including the first camera and second camera, with reference to shown in Fig. 5, Fig. 6, also include：The One acquisition module 501, the second acquisition module 502, adjusting module 503 and light-metering module 504.

First acquisition module 501, for being exported to preview interface of taking pictures in first camera collection preview image During, obtain the target photometry region of the preview image.

Second acquisition module 502, the institute for obtaining first acquisition module 501 that the second camera is detected Target field depth where stating target photometry region.

Adjusting module 503, for the target field depth obtained based on second acquisition module 502, adjusts institute State the light metering weight of preview image.

Light-metering module 504, for based on the light metering weight after the adjustment of the adjusting module 503, to the preview graph As carrying out light-metering.

Wherein, the adjusting module 503 includes：First control submodule 5031, the first extracting sub-module 5032, first are true Stator modules 5033, the second determination sub-module 5034 and the first adjustment submodule 5035.

First control submodule 5031, for controlling the fringe region in the second camera detection preview image The field depth of middle all pixels point.

First extracting sub-module 5032, in edge region, extracting the control of the first control submodule 5031 institute State at least one object edge region that second camera detects that the field depth for obtaining is the target field depth.

First determination sub-module 5033, for the target photometry region and first extracting sub-module 5032 to be extracted At least one object edge region determine centered on photometry region.

Second determination sub-module 5034, for will remove what first determination sub-module 5033 determined in the preview image All image-regions outside the center photometry region are defined as aiding in photometry region.

First adjustment submodule 5035, for adjusting the center light-metering area that first determination sub-module 5033 determines The light metering weight of the auxiliary photometry region that domain and second determination sub-module 5034 determine；Wherein, the fringe region For：All image-regions in addition to target photometry region.

Wherein, the first adjustment submodule 5035 includes：First adjustment unit 50351 and the second adjustment unit 50352.

First adjustment unit 50351, the light metering weight for adjusting the center photometry region is 100%.

Second adjustment unit 50352, the light metering weight for adjusting the auxiliary photometry region is 0.

Then the light-metering module 504 includes：First light-metering submodule 5041.

First light-metering submodule 5041, for the light metering weight 100% according to the center photometry region, to the preview The center photometry region of image carries out light-metering.

Wherein, the first adjustment submodule 5035 includes：3rd adjustment unit 50353 and the 4th adjustment unit 50354.

3rd adjustment unit 50353, the light metering weight for adjusting the center photometry region is a%.

4th adjustment unit 50354, the light metering weight for adjusting the auxiliary photometry region is b%.

Then the light-metering module 504 includes：Second light-metering submodule 5042.

Second light-metering submodule 5042, surveys for the light metering weight a% according to the center photometry region and the auxiliary The light metering weight b% in light region, light-metering is carried out to the center photometry region and the auxiliary photometry region；Wherein, 50<a< 100, a+b=100.

Wherein, the adjusting module 503 includes：First calculating sub module 5036, the second control submodule 5037, second carry Take the adjustment submodule 5039 of submodule 5038 and second.

First calculating sub module 5036, for based on the target field depth, calculating institute in the target photometry region There is the average depth of field c of pixel.

Second control submodule 5037, for controlling the fringe region in the second camera detection preview image The field depth of middle all pixels point.

Second extracting sub-module 5038, in the target photometry region and the fringe region, institute being extracted successively It is [c-w to state the second control submodule 5037 and control the field depth that the second camera detection is obtained₁,c+w₁]、[c-w₂,c- w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image-region.

Second adjustment submodule 5039, the scape for obtaining is extracted for adjusting second extracting sub-module 5038 respectively Deep scope is [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c- w_n)∪(c+w_n,c+w_m] image-region light metering weight be m₁%, m₂%, m₃% ... m_n%.

Then the light-metering module 504 includes：3rd light-metering submodule 5043.

3rd light-metering submodule 5043, for being [c-w according to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+ w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding survey of image-region Light weight m₁%, m₂%, m₃% ... m_n%, is [c-w to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+ w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering；Its In, 0≤w₁<w₂<w₃……<w_n<w_m, m_n<……<m₃<m₂<m₁, m₁%+m₂%+m₃%+ ...+m_n%=100%, the side Edge region is：All image-regions in addition to target photometry region.

Wherein, the adjusting module 503 includes：Second calculating sub module 50310, the 3rd determination sub-module 50311 and Four determination sub-modules 50312.

Second calculating sub module 50310, for based on the target field depth, calculating institute in the target photometry region There is the average depth of field d of pixel.

3rd determination sub-module 50311, for determining the described average depth of field that second calculating sub module 50310 is calculated Target span residing for d.

4th determination sub-module 50312, for the corresponding relation according to default span and light metering weight, determines institute State the corresponding light metering weight s% of the target span of the determination of the 3rd determination sub-module 50311.

Then the light-metering module 504 includes：5th determination sub-module 5044 and the 4th light-metering submodule 5045.

5th determination sub-module 5044, the light metering weight for determining the fringe region in the preview image is t%.

4th light-metering submodule 5045, determines for the 5th determination sub-module 5044 according to center photometry region The light metering weight t% of light metering weight s% and the fringe region, surveys to the center photometry region and the fringe region Light；Wherein, the center photometry region is the target photometry region, and the fringe region is：In addition to target photometry region All image-regions, the average depth of field d values are bigger, and s% values are also bigger, s+t=100.

Wherein, first acquisition module 501 includes：Detection sub-module 5011, acquisition submodule 5012 and the 6th determine Submodule 5013.

Detection sub-module 5011, for detecting mobile terminal user in the clicking operation in preview interface of taking pictures.

Acquisition submodule 5012, obtains for when clicking operation is detected, obtaining the detection of detection sub-module 5011 Clicking operation position.

6th determination sub-module 5013, for the preview image to be included into the institute that the acquisition submodule 5012 is obtained The region for stating the preset first range of the position of clicking operation is defined as the target photometry region.

Wherein, first acquisition module 501 includes：7th determination sub-module 5014.

7th determination sub-module 5014, it is described for the region of the preset second range in the preview image to be defined as Target photometry region.

Wherein, first acquisition module 501 includes：The determination sub-module 5016 of detection sub-module 5015 and the 8th.

Detection sub-module 5015, for carrying out Face datection to the preview image.

8th determination sub-module 5016, for when face is detected, the region where the face being defined as described Target photometry region.

Mobile terminal in the embodiment of the present invention, is exported to preview circle of taking pictures by gathering preview image in the first camera During face, the target photometry region of the preview image is obtained, and obtain the target photometry region that second camera is detected The target field depth at place, based on the target field depth, adjusts the light metering weight of preview image, final to realize based on adjustment Light metering weight afterwards, light-metering is carried out to preview image, the process, by the cooperation between two cameras, obtains preview image And in image the place of target photometry region target field depth, based on the field depth where target photometry region, come it is right The light metering weight of overall preview image is adjusted, and the light-metering plan of entire scope is determined with the field depth information of subrange Slightly, realization exist to preview image spatial location difference reference object, carried out with differentiated light metering weight it is differentiated Light-metering is operated, it is ensured that the accuracy of light-metering, lifts light-metering effect.

Sixth embodiment

As shown in fig. 7, the mobile terminal 600 includes：At least one processor 601, memory 602, at least one network Interface 604 and user interface 603 and camera, the camera include the first camera 606 and second camera 607.It is mobile Each component in terminal 600 is coupled by bus system 605.It is understood that bus system 605 is used to realize these groups Connection communication between part.Bus system 605 in addition to including data/address bus, also including power bus, controlling bus and state Signal bus.But for the sake of for clear explanation, various buses are all designated as bus system 605 in the figure 7.

Wherein, user interface 603 can include display, keyboard or pointing device (for example, mouse, trace ball (trackball), touch-sensitive plate or touch-screen etc..

It is appreciated that the memory 602 in the embodiment of the present invention can be volatile memory or nonvolatile memory, Or may include both volatibility and nonvolatile memory.Wherein, nonvolatile memory can be read-only storage (Read- Only Memory, ROM), programmable read only memory (Programmable ROM, PROM), the read-only storage of erasable programmable Device (Erasable PROM, EPROM), Electrically Erasable Read Only Memory (Electrically EPROM, EEPROM) or Flash memory.Volatile memory can be random access memory (Random Access Memory, RAM), and it is used as outside height Speed caching.By exemplary but be not restricted explanation, the RAM of many forms can use, such as static RAM (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), double data speed synchronous dynamic RAM (Double Data Rate SDRAM, DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), synchronized links Dynamic random access memory (Synch Link DRAM, SLDRAM) and direct rambus random access memory (Direct Rambus RAM, DRRAM).The embodiment of the present invention description system and method memory 602 be intended to including but not limited to these With the memory of any other suitable type.

In some embodiments, memory 602 stores following element, can perform module or data structure, or Person their subset, or their superset：Operating system 6021 and application program 6022.

Wherein, operating system 6021, comprising various system programs, such as ccf layer, core library layer, driving layer etc. are used for Realize various basic businesses and process hardware based task.Application program 6022, comprising various application programs, such as media Player (Media Player), browser (Browser) etc., for realizing various applied business.Realize the embodiment of the present invention The program of method may be embodied in application program 6022.

In embodiments of the present invention, by the program for calling memory 602 to store or instruction, specifically, can be application The program stored in program 6022 or instruction, processor 601 are used to be exported to bat in first camera collection preview image During preview interface, the target photometry region of the preview image is obtained；Obtain what the second camera was detected Target field depth where the target photometry region；Based on the target field depth, the survey of the preview image is adjusted Light weight；The light metering weight after based on adjustment, light-metering is carried out to the preview image.

The method that the embodiments of the present invention are disclosed can apply in processor 601, or be realized by processor 601. Processor 601 is probably a kind of IC chip, the disposal ability with signal.In implementation process, the above method it is each Step can be completed by the instruction of the integrated logic circuit of the hardware in processor 601 or software form.Above-mentioned treatment Device 601 can be general processor, digital signal processor (Digital Signal Processor, DSP), special integrated electricity Road (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic, Discrete hardware components.Can realize or perform disclosed each method in the embodiment of the present invention, step and logic diagram.It is general Processor can be microprocessor or the processor can also be any conventional processor etc..With reference to embodiment of the present invention institute The step of disclosed method, can be embodied directly in hardware decoding processor and perform completion, or with the hardware in decoding processor And software module combination performs completion.Software module may be located at random access memory, and flash memory, read-only storage may be programmed read-only In the ripe storage medium in this area such as memory or electrically erasable programmable memory, register.The storage medium is located at Memory 602, processor 601 reads the information in memory 602, with reference to the step of its hardware completion above method.

It is understood that the embodiment of the present invention description these embodiments can with hardware, software, firmware, middleware, Microcode or its combination are realized.Realized for hardware, processing unit can be realized in one or more application specific integrated circuits (Application Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal Processing, DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable Logic Device, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general place In reason device, controller, microcontroller, microprocessor, other electronic units for performing herein described function or its combination.

For software realize, can by perform the module (such as process, function etc.) of function described in the embodiment of the present invention come Realize the technology described in the embodiment of the present invention.Software code is storable in memory and by computing device.Memory can To realize within a processor or outside processor.

Alternatively, processor 601 is additionally operable to：Obtain the overall distance shown between object and the reference plane in preview interface Parameter information；First area is chosen in the preview interface；According to the overall distance parameter information, determine that the display is right As the distance information value in the first area.

Used as another embodiment, the mobile terminal includes at least two cameras, and processor 601 is additionally operable to：Control The second camera detects the field depth of all pixels point in the fringe region in the preview image；Edge region In, extract at least one object edge region that field depth is the target field depth；By the target photometry region and Photometry region centered at least one object edge region determination；The center photometry region will be removed in the preview image Outer all image-regions are defined as aiding in photometry region；Adjust the survey of the center photometry region and the auxiliary photometry region Light weight；Wherein, the fringe region is：All image-regions in addition to target photometry region.

Alternatively, as another embodiment, processor 601 is additionally operable to：Adjust the light-metering power of the center photometry region Weight is 100%；The light metering weight of the adjustment auxiliary photometry region is 0；According to the light metering weight of the center photometry region 100%, the center photometry region to the preview image carries out light-metering.

Alternatively, as another embodiment, processor 601 is additionally operable to：Adjust the light-metering power of the center photometry region Weight is a%；The light metering weight of the adjustment auxiliary photometry region is b%；According to the light metering weight a% of the center photometry region With the light metering weight b% of the auxiliary photometry region, light-metering is carried out to the center photometry region and the auxiliary photometry region； Wherein, 50<a<100, a+b=100.

Alternatively, as another embodiment, processor 601 is additionally operable to：Based on the target field depth, calculate described The average depth of field c of all pixels point in target photometry region；Side in controlling the second camera to detect the preview image The field depth of all pixels point in edge region；In the target photometry region and the fringe region, the depth of field is extracted successively Scope is [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c- w_n)∪(c+w_n,c+w_m] image-region；The field depth is adjusted respectively for [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁, c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+wn,c+w_m] the light metering weight of image-region be m₁%, m₂%, m₃% ... m_n%；It is [c-w according to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、 [c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding light metering weight of image-region m₁%, m₂%, m₃% ... m_n%, is [c-w to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c- w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering；Wherein, 0≤w₁ <w₂<w₃……<w_n<w_m, m_n<……<m₃<m₂<m₁, m₁%+m₂%+m₃%+ ...+m_n%=100%, the fringe region is： All image-regions in addition to target photometry region.

Alternatively, as another embodiment, processor 601 is additionally operable to：Based on the target field depth, calculate described The average depth of field d of all pixels point in target photometry region；Determine the target span residing for the average depth of field d；According to Default span and the corresponding relation of light metering weight, determine the corresponding light metering weight s% of the target span；It is determined that The light metering weight of the fringe region in the preview image is t%；Light metering weight s% and the side according to center photometry region The light metering weight t% in edge region, light-metering is carried out to the center photometry region and the fringe region；Wherein, the center is surveyed Light region is the target photometry region, and the fringe region is：All image-regions in addition to target photometry region are described flat Equal depth of field d values are bigger, and s% values are also bigger, s+t=100.

Alternatively, as another embodiment, processor 601 is additionally operable to：Mobile terminal user is in preview circle of taking pictures for detection Clicking operation on face；When clicking operation is detected, the position of clicking operation is obtained；The preview image is included described The region of the preset first range of the position of clicking operation is defined as the target photometry region.

Alternatively, as another embodiment, processor 601 is additionally operable to：By default second model in the preview image The region enclosed is defined as the target photometry region.

Alternatively, as another embodiment, processor 601 is additionally operable to：Face datection is carried out to the preview image；When When detecting face, the region where the face is defined as the target photometry region.

The mobile terminal can realize each process of terminal realization in previous embodiment, to avoid repeating, here no longer Repeat.

7th embodiment

As shown in figure 8, the mobile terminal 700 can be mobile phone, panel computer, personal digital assistant (Personal Digital Assistant, PDA) or vehicle-mounted computer etc..

Mobile terminal 700 in Fig. 8 includes radio frequency (Radio Frequency, RF) circuit 710, memory 720, input Unit 730, display unit 740, processor 760, voicefrequency circuit 770, WiFi (Wireless Fidelity) module 780 and electricity Source 790 and camera, the camera include the first camera 751 and second camera 752.

Wherein, input block 730 can be used to receive the numeral or character information of user input, and produce and mobile terminal 700 user is set and the relevant signal input of function control.Specifically, in the embodiment of the present invention, the input block 730 can With including contact panel 731.Contact panel 731, also referred to as touch-screen, can collect user thereon or neighbouring touch operation (such as user uses the operations of any suitable object or annex on contact panel 731 such as finger, stylus), and according to advance The formula of setting drives corresponding attachment means.Optionally, contact panel 731 may include touch detecting apparatus and touch controller Two parts.Wherein, touch detecting apparatus detect the touch orientation of user, and detect the signal that touch operation brings, by signal Send touch controller to；Touch controller receives touch information from touch detecting apparatus, and is converted into contact coordinate, Give the processor 760 again, and the order sent of receiving processor 760 and can be performed.Furthermore, it is possible to using resistance-type, The polytypes such as condenser type, infrared ray and surface acoustic wave realize contact panel 731.Except contact panel 731, input block 730 can also include other input equipments 732, and other input equipments 732 can include but is not limited to physical keyboard, function key One or more in (such as volume control button, switch key etc.), trace ball, mouse, action bars etc..

Wherein, display unit 740 can be used for display by the information of user input or be supplied to information and the movement of user The various menu interfaces of terminal 700.Display unit 740 may include display panel 741, optionally, can use LCD or organic hairs The forms such as optical diode (Organic Light-Emitting Diode, OLED) configure display panel 741.

It should be noted that contact panel 731 can cover display panel 741, touch display screen is formed, when touch display screen inspection Measure thereon or after neighbouring touch operation, processor 760 is sent to determine the type of touch event, with preprocessor 760 provide corresponding visual output according to the type of touch event in touch display screen.

Touch display screen includes Application Program Interface viewing area and conventional control viewing area.The Application Program Interface viewing area And the arrangement mode of the conventional control viewing area is not limited, can be arranged above and below, left-right situs etc. can distinguish two and show Show the arrangement mode in area.The Application Program Interface viewing area is displayed for the interface of application program.Each interface can be with The interface element such as the icon comprising at least one application program and/or widget desktop controls.The Application Program Interface viewing area It can also be the empty interface not comprising any content.The conventional control viewing area be used for show utilization rate control higher, for example, Application icons such as settings button, interface numbering, scroll bar, phone directory icon etc..

Wherein processor 760 is the control centre of mobile terminal 700, using various interfaces and connection whole mobile phone Various pieces, by running or performing software program and/or module of the storage in first memory 721, and call storage Data in second memory 722, perform the various functions and processing data of mobile terminal 700, so as to mobile terminal 700 Carry out integral monitoring.Optionally, processor 760 may include one or more processing units.

In embodiments of the present invention, by call store the first memory 721 in software program and/or module and/ Or the data in the second memory 722, processor 760 is used to be exported to taking pictures in first camera collection preview image During preview interface, the target photometry region of the preview image is obtained；Obtain the institute that the second camera is detected Target field depth where stating target photometry region；Based on the target field depth, the light-metering of the preview image is adjusted Weight；The light metering weight after based on adjustment, light-metering is carried out to the preview image.

Alternatively, as another embodiment, processor 760 is additionally operable to control the second camera to detect the preview graph The field depth of all pixels point in fringe region as in；In edge region, extraction field depth is the target depth of field At least one object edge region of scope；The target photometry region and at least one object edge region are defined as Center photometry region；All image-regions in the preview image in addition to the center photometry region are defined as to aid in light-metering Region；Adjust the light metering weight of the center photometry region and the auxiliary photometry region；Wherein, the fringe region is：Remove All image-regions outside target photometry region.

Alternatively, as another embodiment, the light metering weight that processor 760 is additionally operable to adjust the center photometry region is 100%；The light metering weight of the adjustment auxiliary photometry region is 0；According to the light metering weight 100% of the center photometry region, The center photometry region to the preview image carries out light-metering.

Alternatively, as another embodiment, the light metering weight that processor 760 is additionally operable to adjust the center photometry region is A%；The light metering weight of the adjustment auxiliary photometry region is b%；Light metering weight a% and institute according to the center photometry region The light metering weight b% of auxiliary photometry region is stated, light-metering is carried out to the center photometry region and the auxiliary photometry region；Its In, 50<a<100, a+b=100.

Alternatively, as another embodiment, processor 760 is additionally operable to, based on the target field depth, calculate the mesh The average depth of field c of all pixels point in mark photometry region；Edge in controlling the second camera to detect the preview image The field depth of all pixels point in region；In the target photometry region and the fringe region, depth of field model is extracted successively It is [c-w to enclose₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n) ∪(c+w_n,c+w_m] image-region；The field depth is adjusted respectively for [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+ w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the light metering weight of image-region be m₁%, m₂%, m₃% ... m_n%；It is [c-w according to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、 [c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding light metering weight of image-region m₁%, m₂%, m₃% ... m_n%, is [c-w to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c- w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering；Wherein, 0≤w₁ <w₂<w₃……<w_n<w_m, m_n<……<m₃<m₂<m₁, m₁%+m₂%+m₃%+ ...+m_n%=100%, the fringe region is： All image-regions in addition to target photometry region.

Alternatively, as another embodiment, processor 760 is additionally operable to, based on the target field depth, calculate the mesh The average depth of field d of all pixels point in mark photometry region；Determine the target span residing for the average depth of field d；According to pre- If span and light metering weight corresponding relation, determine the corresponding light metering weight s% of the target span；Determine institute The light metering weight for stating the fringe region in preview image is t%；According to the light metering weight s% and the edge of center photometry region The light metering weight t% in region, light-metering is carried out to the center photometry region and the fringe region；Wherein, the center light-metering Region is the target photometry region, and the fringe region is：All image-regions in addition to target photometry region, it is described average Depth of field d values are bigger, and s% values are also bigger, s+t=100.

Alternatively, as another embodiment, processor 760 is additionally operable to detection mobile terminal user in preview interface of taking pictures On clicking operation；When clicking operation is detected, the position of clicking operation is obtained；The preview image is included into the point The region for hitting the preset first range of the position of operation is defined as the target photometry region.

Alternatively, as another embodiment, processor 760 is additionally operable to the preset second range in the preview image Region be defined as the target photometry region.

Alternatively, as another embodiment, processor 760 is additionally operable to carry out Face datection to the preview image；When When detecting face, the region where the face is defined as the target photometry region.

Those of ordinary skill in the art it is to be appreciated that with reference to disclosed in the embodiment of the present invention embodiment description it is each The unit and algorithm steps of example, can be realized with the combination of electronic hardware or computer software and electronic hardware.These Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty Technical staff can realize described function to each specific application using distinct methods, but this realization should not Think beyond the scope of this invention.

It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.

In embodiment provided herein, it should be understood that disclosed apparatus and method, can be by other Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, is only A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of device or unit by some interfaces Connect, can be electrical, mechanical or other forms.

The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme 's.

In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.

If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can be with store program codes Medium.

The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.

Each embodiment in this specification is described by the way of progressive, what each embodiment was stressed be with The difference of other embodiment, between each embodiment identical similar part mutually referring to.

Although having been described for the preferred embodiment of the embodiment of the present invention, those skilled in the art once know base This creative concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to Including preferred embodiment and fall into having altered and changing for range of embodiment of the invention.

Finally, in addition it is also necessary to explanation, in embodiments of the present invention, such as first and second or the like relational terms are only Only it is used for making a distinction an entity or operation with another entity or operation, and not necessarily requires or imply these realities There is any this actual relation or order between body or operation.And, term " including ", "comprising" or its it is any its His variant is intended to including for nonexcludability, so that process, method, article or terminal including a series of key elements set It is standby not only to include those key elements, but also other key elements including being not expressly set out, or also include being this process, side Method, article or the intrinsic key element of terminal device.In the absence of more restrictions, being limited by sentence "including a ..." Fixed key element, it is not excluded that also exist in the process including the key element, method, article or terminal device other identical Key element.

Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person for the art comes Say, some improvements and modifications can also be made under the premise of principle of the present invention is not departed from, and these improvements and modifications also exist In protection scope of the present invention.

Claims

1. a kind of light measuring method, is applied to include the mobile terminal of the first camera and second camera, it is characterised in that bag Include：

During first camera collection preview image is exported to preview interface of taking pictures, the preview image is obtained Target photometry region；

2. method according to claim 1, it is characterised in that described based on the target field depth, adjusts described pre- Look at image light metering weight the step of, including：

The field depth of all pixels point in fringe region in controlling the second camera to detect the preview image；

In edge region, at least one object edge region that field depth is the target field depth is extracted；

Photometry region centered on the target photometry region and at least one object edge region are determined；

All image-regions in the preview image in addition to the center photometry region are defined as to aid in photometry region；

Adjust the light metering weight of the center photometry region and the auxiliary photometry region；

3. method according to claim 2, it is characterised in that the adjustment center photometry region and the auxiliary are surveyed The step of light metering weight in light region, including：

The light metering weight for adjusting the center photometry region is 100%；

The light metering weight of the adjustment auxiliary photometry region is 0；

Then it is described based on adjustment after the light metering weight, the step of carry out light-metering to the preview image, including：

According to the light metering weight 100% of the center photometry region, the center photometry region to the preview image is carried out Light-metering.

4. method according to claim 2, it is characterised in that the adjustment center photometry region and the auxiliary are surveyed The step of light metering weight in light region, including：

The light metering weight for adjusting the center photometry region is a%；

The light metering weight of the adjustment auxiliary photometry region is b%；

According to the light metering weight a% and the light metering weight b% of the auxiliary photometry region of the center photometry region, in described Heart photometry region and the auxiliary photometry region carry out light-metering；

Wherein, 50<a<100, a+b=100.

5. method according to claim 1, it is characterised in that described based on the target field depth, adjusts described pre- Look at image light metering weight the step of, including：

Based on the target field depth, the average depth of field c of all pixels point in the target photometry region is calculated；

In the target photometry region and the fringe region, it is [c-w that field depth is extracted successively₁,c+w₁]、[c-w₂,c- w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image-region；

The field depth is adjusted respectively for [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+ w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image-region light metering weight be m₁%, m₂%, m₃% ... m_n%；

It is [c-w according to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+ w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding light metering weight m of image-region₁%, m₂%, m₃% ... m_n% is right The field depth is [c-w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]…… [c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering；

Wherein, 0≤w₁<w₂<w₃……<w_n<w_m, m_n<……<m₃<m₂<m₁, m₁%+m₂%+m₃%+ ...+m_n%=100%, institute Stating fringe region is：All image-regions in addition to target photometry region.

6. method according to claim 1, it is characterised in that described based on the target field depth, adjusts described pre- Look at image light metering weight the step of, including：

Based on the target field depth, the average depth of field d of all pixels point in the target photometry region is calculated；

Determine the target span residing for the average depth of field d；

According to default span and the corresponding relation of light metering weight, the corresponding light metering weight of the target span is determined S%；

The light metering weight for determining the fringe region in the preview image is t%；

According to the light metering weight s% and the light metering weight t% of the fringe region of center photometry region, to the center light-metering area Domain and the fringe region carry out light-metering；

Wherein, the center photometry region is the target photometry region, and the fringe region is：In addition to target photometry region All image-regions, the average depth of field d values are bigger, and s% values are also bigger, s+t=100.

7. method according to claim 1, it is characterised in that the target photometry region of the acquisition preview image Step, including：

Mobile terminal user is in the clicking operation in preview interface of taking pictures for detection；

When clicking operation is detected, the position of clicking operation is obtained；

The preview image being included, the region of the preset first range of the position of the clicking operation is defined as the target Photometry region.

8. method according to claim 1, it is characterised in that the target photometry region of the acquisition preview image Step, including：

The region of the preset second range in the preview image is defined as the target photometry region.

9. method according to claim 1, it is characterised in that the target photometry region of the acquisition preview image Step, including：

Face datection is carried out to the preview image；

When face is detected, the region where the face is defined as the target photometry region.

10. a kind of mobile terminal, including the first camera and second camera, it is characterised in that also include：

First acquisition module, during being exported to preview interface of taking pictures in first camera collection preview image, Obtain the target photometry region of the preview image；

Second acquisition module, for obtaining the target that first acquisition module that the second camera is detected is obtained Target field depth where photometry region；

Adjusting module, for the target field depth obtained based on second acquisition module, adjusts the preview image Light metering weight；

Light-metering module, for based on the light metering weight after adjusting module adjustment, light-metering being carried out to the preview image.

11. mobile terminals according to claim 10, it is characterised in that the adjusting module includes：

First control submodule, for controlling the second camera to detect the preview image in fringe region in all pictures The field depth of vegetarian refreshments；

First extracting sub-module, the second camera is controlled in edge region, extracting first control submodule The field depth that detection is obtained is at least one object edge region of the target field depth；

First determination sub-module, for by least one described in the target photometry region and first extracting sub-module extraction Photometry region centered on individual object edge region determination；

Second determination sub-module, for the center light-metering that first determination sub-module determines will to be removed in the preview image All image-regions outside region are defined as aiding in photometry region；

First adjustment submodule, for adjusting the center photometry region and described second that first determination sub-module determines The light metering weight of the auxiliary photometry region that determination sub-module determines；

12. mobile terminals according to claim 11, it is characterised in that the first adjustment submodule includes：

First adjustment unit, the light metering weight for adjusting the center photometry region is 100%；

Second adjustment unit, the light metering weight for adjusting the auxiliary photometry region is 0；

Then the light-metering module includes：

First light-metering submodule, for the light metering weight 100% according to the center photometry region, to the institute of the preview image The center photometry region of stating carries out light-metering.

13. mobile terminals according to claim 11, it is characterised in that the first adjustment submodule includes：

3rd adjustment unit, the light metering weight for adjusting the center photometry region is a%；

4th adjustment unit, the light metering weight for adjusting the auxiliary photometry region is b%；

Then the light-metering module includes：

Second light-metering submodule, for the light metering weight a% according to the center photometry region and the auxiliary photometry region Light metering weight b%, light-metering is carried out to the center photometry region and the auxiliary photometry region；

Wherein, 50<a<100, a+b=100.

14. mobile terminals according to claim 10, it is characterised in that the adjusting module includes：

First calculating sub module, for based on the target field depth, calculating all pixels point in the target photometry region Average depth of field c；

Second control submodule, for controlling the second camera to detect the preview image in fringe region in all pictures The field depth of vegetarian refreshments；

Second extracting sub-module, in the target photometry region and the fringe region, extracting second control successively It is [c-w that system module controls the field depth that the second camera detection is obtained₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+ w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] image-region；

Second adjustment submodule, the field depth obtained for adjusting second extracting sub-module to extract respectively is [c- w₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n, c+w_m] image-region light metering weight be m₁%, m₂%, m₃% ... m_n%；

Then the light-metering module includes：

3rd light-metering submodule, for being [c-w according to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、 [c-w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] the corresponding light metering weight of image-region m₁%, m₂%, m₃% ... m_n%, is [c-w to the field depth₁,c+w₁]、[c-w₂,c-w₁)∪(c+w₁,c+w₂]、[c- w₃,c-w₂)∪(c+w₂,c+w₃]……[c-w_m,c-w_n)∪(c+w_n,c+w_m] each image-region carry out light-metering；

15. mobile terminals according to claim 10, it is characterised in that the adjusting module includes：

Second calculating sub module, for based on the target field depth, calculating all pixels point in the target photometry region Average depth of field d；

3rd determination sub-module, for determining that the target residing for the described average depth of field d that second calculating sub module is calculated takes Value scope；

4th determination sub-module, for the corresponding relation according to default span and light metering weight, determines that the described 3rd is true The corresponding light metering weight s% of the target span that stator modules determine；

Then the light-metering module includes：

5th determination sub-module, the light metering weight for determining the fringe region in the preview image is t%；

4th light-metering submodule, for the light metering weight s% that the 5th determination sub-module according to center photometry region determines With the light metering weight t% of the fringe region, light-metering is carried out to the center photometry region and the fringe region；

16. mobile terminals according to claim 10 are characterized in that, first acquisition module includes：

Detection sub-module, for detecting mobile terminal user in the clicking operation in preview interface of taking pictures；

Acquisition submodule, for when clicking operation is detected, obtaining the clicking operation that the detection sub-module detection is obtained Position；

6th determination sub-module, for the preview image to be included into the clicking operation that the acquisition submodule is obtained The region of the preset first range of position is defined as the target photometry region.

17. mobile terminals according to claim 10, it is characterised in that first acquisition module includes：

7th determination sub-module, for the region of the preset second range in the preview image to be defined as into the target light-metering Region.

18. mobile terminals according to claim 10, it is characterised in that first acquisition module includes：

Detection sub-module, for carrying out Face datection to the preview image；

8th determination sub-module, for when face is detected, the region where the face being defined as into the target light-metering Region.