CN108337446A - High-dynamic-range image acquisition method, device based on dual camera and equipment - Google Patents
High-dynamic-range image acquisition method, device based on dual camera and equipment Download PDFInfo
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- CN108337446A CN108337446A CN201810326327.6A CN201810326327A CN108337446A CN 108337446 A CN108337446 A CN 108337446A CN 201810326327 A CN201810326327 A CN 201810326327A CN 108337446 A CN108337446 A CN 108337446A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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Abstract
This application discloses a kind of high-dynamic-range image acquisition method, device and equipment based on dual camera, wherein method include：Preview screen is generated according to the picture of the first camera acquisition；The exposure value for adjusting second camera, when determining that the corresponding each color channel histograms of picture of second camera acquisition meet preset condition, corresponding under-exposure offset and overexposure offset；According to under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.The method achieve the pictures using the acquisition of non-preview camera, dynamic determination best under-exposure offset corresponding with photographed scene and best overexposure offset, to ensure the precision of determining under-exposure offset and overexposure offset, but also the quality of the high dynamic range images finally obtained can be promoted, improve user experience.
Description
Technical field
This application involves technical field of image processing, more particularly to a kind of high dynamic range images based on dual camera obtain
Take method, apparatus and equipment.
Background technology
Nowadays, various intelligent terminals have become the necessary article of user's daily life, and user can be carried out by terminal device
The operation of multiple functions.For example, utilizing the camera shooting high dynamic range images (High-Dynamic in terminal device
Range, abbreviation HDR).Wherein, HDR be by by normal exposure image, three images of under-exposure image and overexposure light image into
Row fusion obtains.
In actual application, when user is using camera shooting high dynamic range images, terminal device is typically first sharp
The picture of shooting area is acquired with camera module and carries out preview, and then the color histogram of preview screen is determined, with
Under-exposure amount and overexposure light quantity are estimated, the under-exposure of same area is then shot according to the under-exposure amount of estimation and overexposure light quantity
Image and overexposure light image.Then pass through image fusion technology by the normal exposure image, under-exposure image and overexposure of shooting
Image is synthesized, and high dynamic range images are obtained.
However, by the color histogram both ends of preview screen in practical application, there may be shut-off features, to cause
There are large errors for the under-exposure amount and overexposure light quantity of estimation so that the exposure of the under-exposure image and overexposure light image that get
Amount is inadequate, to influence the dynamic range of the high dynamic range images obtained so that the quality of the high dynamic range images of acquisition
Difference.
Invention content
The application is intended to solve above-mentioned one of technological deficiency at least to a certain extent.
For this purpose, first purpose of the application is to propose a kind of high dynamic range images acquisition side based on dual camera
Method, the method achieve the picture using the acquisition of non-preview camera, dynamic determination best deficient exposure corresponding with photographed scene
Light offset and best overexposure offset, to ensure determining under-exposure offset and overexposure offset
Precision, but also the quality of the high dynamic range images finally obtained can be promoted, improve user experience.
Second purpose of the application is to propose a kind of high dynamic range image acquisition device based on dual camera.
The third purpose of the application is to propose a kind of terminal device.
The 4th purpose of the application is to propose a kind of computer readable storage medium.
To achieve the goals above, the high dynamic range images based on dual camera of the application first aspect embodiment obtain
Method is taken, including：Preview screen is generated according to the picture of the first camera acquisition；The exposure value of second camera is adjusted, is determined
It is corresponding under-exposure when the corresponding each color channel histograms of picture of the second camera acquisition meet preset condition
Offset and overexposure offset；According to the under-exposure offset and overexposure offset, the high dynamic of current scene is obtained
Range image.
To achieve the goals above, the high dynamic range images based on dual camera of the application second aspect embodiment obtain
Device is taken, including：Generation module, the picture for being acquired according to the first camera generate preview screen；Determining module, for adjusting
It is pre- to determine that the corresponding each color channel histograms of picture of the second camera acquisition meet for the exposure value of whole second camera
If when condition, corresponding under-exposure offset and overexposure offset；Acquisition module, for according to the under-exposure compensation
Value and overexposure offset, obtain the high dynamic range images of current scene.
To achieve the goals above, the terminal device of the application third aspect embodiment, including：Memory, processor and
Camera module；The camera module, for obtaining the image under present filming scene；The memory, it is executable for storing
Program code；The processor is held to run with described for reading the executable program code stored in the memory
The corresponding program of line program code, for realizing the high dynamic range figure based on dual camera described in first aspect embodiment
As acquisition methods.
To achieve the goals above, the computer readable storage medium of the application fourth aspect embodiment, is stored thereon with
Computer program realizes the height based on dual camera described in first aspect embodiment when the computer program is executed by processor
Dynamic-range image acquisition method.
Technical solution disclosed in the present application, has the advantages that：
Preview screen is generated according to the picture of the first camera acquisition first, then adjusts the exposure value of second camera,
And when determining that the corresponding each color channel histograms of picture of second camera acquisition meet preset condition, corresponding deficient exposure
Light offset and overexposure offset obtain current scene then according to determining under-exposure offset and overexposure offset
High dynamic range images.Hereby it is achieved that the picture acquired using non-preview camera, dynamic determination and photographed scene pair
The best under-exposure offset and best overexposure offset answered, to ensure determining under-exposure offset and mistake
The precision of exposure bias value, but also the quality of the high dynamic range images finally obtained can be promoted, improve user's body
It tests.
The additional aspect of the application and advantage will be set forth in part in the description, and will partly become from the following description
It obtains obviously, or recognized by the practice of the application.
Description of the drawings
The application is above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is the flow according to the high-dynamic-range image acquisition method based on dual camera of the application one embodiment
Figure；
Fig. 2 (a) is the schematic diagram according to the red channel histogram of the application one embodiment；
Fig. 2 (b) is the schematic diagram according to the green channel histogram of the application one embodiment；
Fig. 2 (c) is the schematic diagram according to the blue channel histogram of the application one embodiment；
Fig. 3 is the stream according to the high-dynamic-range image acquisition method based on dual camera of the application another embodiment
Cheng Tu；
Fig. 4 is the stream according to the high-dynamic-range image acquisition method based on dual camera of the application another embodiment
Cheng Tu；
Fig. 5 is the structure according to the high dynamic range image acquisition device based on dual camera of the application one embodiment
Schematic diagram；
Fig. 6 is the knot according to the high dynamic range image acquisition device based on dual camera of the application another embodiment
Structure schematic diagram；
Fig. 7 is the knot according to the high dynamic range image acquisition device based on dual camera of the application another embodiment
Structure schematic diagram；
Fig. 8 is the structural schematic diagram according to the terminal device of the application one embodiment.
Specific implementation mode
Embodiments herein is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the application, and should not be understood as the limitation to the application.
In order to solve in the related technology, under-exposure amount and overexposure light quantity to be estimated according to the color histogram of preview screen
When, since the color histogram both ends of preview screen are there may be shut-off feature, to which the under-exposure amount and mistake of estimation can be caused
There are large errors for light exposure so that the light exposure of the under-exposure image and overexposure light image that get is inadequate, to cause most
A kind of ropy problem of high dynamic range images obtained eventually, it is proposed that high dynamic range images acquisition based on dual camera
Method.
High-dynamic-range image acquisition method provided by the present application based on dual camera is acquired according only to the first camera
Picture generate preview screen, then by adjusting the exposure value of second camera, to determine the picture of second camera acquisition
When corresponding each color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset, so
Afterwards according to under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.Hereby it is achieved that utilizing
The picture of non-preview camera acquisition, dynamic determination best under-exposure offset corresponding with photographed scene and best overexposure
Offset to ensure the precision of determining under-exposure offset and overexposure offset, but also can carry
The quality for rising the high dynamic range images finally obtained, improves user experience.
Below with reference to the accompanying drawings the high-dynamic-range image acquisition method based on dual camera, dress of the embodiment of the present application are described
It sets and equipment.
Fig. 1 is combined first, and the high-dynamic-range image acquisition method based on dual camera of the application is carried out specifically
It is bright.
Fig. 1 is the flow according to the high-dynamic-range image acquisition method based on dual camera of the application one embodiment
Figure.
As shown in Figure 1, the high-dynamic-range image acquisition method based on dual camera of the application may include following step
Suddenly：
Step 101, preview screen is generated according to the picture of the first camera acquisition.
Specifically, the high-dynamic-range image acquisition method provided by the embodiments of the present application based on dual camera, Ke Yiyou
Terminal device provided by the present application executes.Wherein, the high dynamic range images based on dual camera are provided in terminal device to obtain
Device is taken, the image acquisition under present filming scene is managed or is controlled to realize.
Wherein, terminal device can be the arbitrary hardware device with dual camera in the present embodiment, such as smart mobile phone,
Camera, personal computer (personal computer, referred to as PC) etc., the application is not especially limited this.
Optionally, dual camera can refer to two cameras that direction is consistent in terminal device, for example can refer to hand
Two rear cameras or two front cameras in machine etc..
It should be noted that in the present embodiment, the set-up mode of two rear cameras can be, but be not limited to following
Mode：
Mode one：It is horizontally disposed.
Mode two：Vertically it is arranged.
Wherein, horizontal direction refers to the direction parallel with terminal device short side, and vertical direction refers to and terminal device long side
Parallel direction.
In specific implementation, high dynamic range figure acquisition device of the application based on dual camera is getting shooting
When instruction, the screening-mode of terminal device can be determined first, with determine terminal device current shooting pattern whether be
High dynamic range screening-mode.When it is high dynamic range screening-mode to determine current shooting pattern, you can the first camera shooting of control
Head is acquired the picture of present filming scene, to generate preview screen and be shown by the display interface of terminal device
Show.
Wherein, the application can determine that current shooting pattern is high dynamic range screening-mode in the following manner.
The first realization method
Get high dynamic range images acquisition instruction.
Specifically, the high dynamic range images acquisition instruction got in the present embodiment, can be that user is whole by clicking
High dynamic range images on the display panel of end equipment obtain function key, to trigger acquisition instruction；Alternatively, rotary mode turns
Disk, by label alignment HDR screening-modes etc., the application is not especially limited this.
Second of realization method
Determine that present filming scene is backlight scene.
Specifically, due to when photographed scene is backlight, the image of common exposal model shooting is likely to occur deficient exposure, or
The case where overexposure, therefore in order to get the more details of image, terminal device can determine that current shooting pattern is inverse
Light time, automatic switchover exposal model are high dynamic range images pattern.
Further, the application is controlled in the picture for controlling the first camera acquisition present filming scene
Second camera is acquired the picture of present filming scene, to facilitate the picture subsequently according to acquisition to carry out analyzing processing behaviour
Make.
Step 102, the exposure value for adjusting second camera determines that the corresponding each color of picture of second camera acquisition is logical
When road histogram meets preset condition, corresponding under-exposure offset and overexposure offset.
Wherein, preset condition can be arranged according to actual photographed scene adaptability, and the application is not especially limited this.Than
Such as, as brightness value increases in each color channel histograms, the folded addition and value of pixel ratio reaches pixel ratio threshold value etc..
In practical application, the brightness of image ranging from truncating that can be characterized in horizontal axis due to each color channel histograms
It has been shown that, that is, be only capable of displaying pixel distribution situation of the brightness range between 0-255.If for example, brightness in red channel histogram
At 255, when corresponding pixel quantity is 1000, it can only explain the corresponding brightness range of red channel in current picture and be more than
Or the pixel quantity equal to 255 is 1000, at this point, it is 500 or more that may have the corresponding brightness of the quantity of 800 pixels, only
It is 255 to have the corresponding brightness of 200 pixels, this allows for determining under-exposure offset or mistake according only to each color channel histograms
When exposure bias value, determining Numerical accuracy is inadequate, to influence the dynamic range of HDR image.Therefore, the embodiment of the present application
In, when determining under-exposure offset and overexposure offset, by using the picture for being not used in the camera acquisition that preview is shown
Face, the dynamic under-exposure offset and overexposure offset determined under present filming scene.
Specifically, when showing preview screen in terminal device display interface, terminal device can acquire second camera
Picture it is for statistical analysis, with the corresponding each color channel histograms of the picture acquired according to second camera, determine current
Under-exposure offset under photographed scene and overexposure offset.Then it is compensated according to determining under-exposure offset and overexposure
Value, control second camera acquire corresponding overexposure compensation picture and under-exposure compensation picture respectively, and to freshly harvested picture
Face is reanalysed respectively, to judge whether the corresponding each color channel histograms of freshly harvested picture meet default item
Part.
If satisfied, the under-exposure offset of above-mentioned determination and overexposure offset are then determined as final under-exposure benefit
Repay value and overexposure offset；If not satisfied, then according to the corresponding each color channel histograms of freshly harvested picture, again
New under-exposure offset and new overexposure offset are determined, then further according to the new under-exposure offset determined again
And new overexposure offset, control second camera acquire corresponding picture, and so on, until the picture of acquisition is corresponding
Until each color channel histograms meet preset condition, when then will meet preset condition, corresponding under-exposure offset and mistake
Exposure bias value is determined as corresponding under-exposure offset and overexposure offset under present filming scene.
Wherein, the corresponding each color channel histograms of picture of second camera acquisition in this application, can be according to RGB
Data determine that the present embodiment does not repeat this excessively.
It should be noted that if the RGB data obtained in the present embodiment includes red (R), green (G), blue (B) three colors
Channel, then corresponding determining each color channel histograms are then three, respectively red channel histogram, green channel histogram
Figure and blue channel histogram.
Further, three kinds of color channel histograms of above-mentioned determination, can be for details, reference can be made to shown in Fig. 2, and Fig. 2 (a) is red
Chrominance channel histogram, Fig. 2 (b) are green channel histogram, and Fig. 2 (c) is blue channel histogram.Wherein, each Color Channel is straight
In square figure, x-axis indicates that brightness of image, y-axis indicate that each pixel is located at the pixel ratio under the brightness in image.
If the RGB data obtained in the present embodiment includes R, Gr, Gb, when tetra- Color Channels of B, then corresponding determining face
Chrominance channel histogram is then four, respectively red channel histogram, green (Gr) channel histogram, the channel green (Gb) histogram
Figure and blue channel histogram.
It is further, smaller without influence, or influence on its corresponding each color channel histograms due to the size of picture,
Therefore in order to reduce operand in the embodiment of the present application, the application can also lead to before the exposure value of adjustment second camera
Crossing reduces the current resolution ratio of second camera, to improve arithmetic speed.
That is, the application is by reducing second camera current resolution, the picture dimension that will be acquired reduces, and
This will not impact brightness histogram the diminution for acquiring picture dimension, to realize reduction operand, improve operation speed
Degree.For example, second camera resolution ratio is reduced to 500,000 etc. from 20,000,000.
Step 103, according to under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.
Specifically, under determining present filming scene under-exposure offset and overexposure offset after, based on double
The high dynamic range image acquisition device of camera can obtain current scene according to under-exposure offset and overexposure offset
High dynamic range images.
When specific implementation, the application can utilize the first camera and/or second camera, according to under-exposure offset
And overexposure offset, obtain the high dynamic range images of current scene.
It is understood that obtaining the high dynamic range figure of current scene using the first camera and/or second camera
As can obtain the under-exposure image of current scene using the first camera, while current scene is obtained using second camera
Overexposure light image, then the normal exposure image for obtaining current scene, under-exposure image and overexposure light image are merged
Processing, generates the high dynamic range images of current scene；
Alternatively, can also be that merely with the first camera, according to under-exposure compensation and overexposure offset, front court is worked as in acquisition
Then the overexposure light image of scape, under-exposure compensation and normal exposure image will obtain overexposure light image, under-exposure compensation and normal
Exposure image carries out fusion treatment, generates the high dynamic range images of current scene；
Alternatively, can also be that merely with second camera, according to under-exposure compensation and overexposure offset, front court is worked as in acquisition
Then the overexposure light image of scape, under-exposure compensation and normal exposure image will obtain overexposure light image, under-exposure compensation and normal
Exposure image carries out fusion treatment, generates the high dynamic range images of current scene, the application is not especially limited this.
It should be noted that when being the high dynamic range images for obtaining current scene using the first camera in the application
When, in order to get the image that light exposure meets condition, the picture that the application can will be acquired according to second camera, really
Fixed under-exposure offset and overexposure offset is mapped to the first camera so that the first camera can get it is corresponding
High dynamic range images.
The high-dynamic-range image acquisition method based on dual camera of the embodiment of the present application, first according to the first camera
The picture of acquisition generates preview screen, then adjusts the exposure value of second camera, and determine the picture of second camera acquisition
When corresponding each color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset, so
Afterwards according to determining under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.Hereby it is achieved that
Using the picture of non-preview camera acquisition, dynamic determination best under-exposure offset corresponding with photographed scene and most preferably
Overexposure offset, to ensure the precision of determining under-exposure offset and overexposure offset, but also
The quality that the high dynamic range images finally obtained can be promoted, improves user experience.
By above-mentioned analysis it is found that in the embodiment of the present application, it can be acquired according to non-preview camera (second camera)
Picture, the under-exposure offset and overexposure offset being dynamically determined under present filming scene.Specific implementation when, due to
During actual photographed, the acquisition parameters of the first camera and second camera have differences, such as light exposure or sensitivity
Etc. parameters difference when.Therefore in order to get the satisfactory under-exposure image of light exposure and overexposure light image, this implementation
Example determines under-exposure offset in the corresponding each color channel histograms of preview screen currently acquired using a camera
And after overexposure offset, it is also necessary to according to the corresponding light exposure of two cameras and sensitivity, determine that another is taken the photograph
As corresponding under-exposure offset or overexposure offset.With reference to Fig. 3, to the height based on dual camera of the application
Dynamic-range image acquisition method is further described.
Fig. 3 is the flow chart of another high-dynamic-range image acquisition method based on dual camera of the application.
As shown in figure 3, the high-dynamic-range image acquisition method based on dual camera of the application may include following step
Suddenly：
Step 301, preview screen is generated according to the picture of the first camera acquisition.
Step 302, the exposure value for adjusting second camera determines that the corresponding each color of picture of second camera acquisition is logical
When road histogram meets preset condition, corresponding under-exposure offset and overexposure offset.
Step 303, according to the corresponding light exposure of the first camera and the corresponding light exposure of sensitivity, second camera and sense
Luminosity and under-exposure offset and overexposure offset determine the under-exposure offset of the corresponding target of the first camera and target
Overexposure offset.
That is, the application needs to ensure when obtaining the image of different exposure parameters respectively using two cameras
The acquisition parameters of itself match the corresponding exposure parameter of each camera with the camera, to make the first camera and second image
The under-exposure image and overexposure light image that head obtains respectively meet the requirements.
Wherein, in the present embodiment, the light exposure acquisition modes of the first camera and second camera, can be according to formula
(1) it is determined with (2)：
Specifically, light exposure=photoreceptor receives speed × time for exposure ... ... ... (1) of light
Photoreceptor receives intensity × aperture ... ... ... ... (2) of speed=ambient light of light
Then, by above-mentioned formula (1) and (2) simultaneous, you can obtain intensity × aperture × exposure of light exposure=ambient light
Time (is known as formula (3)).
In practical application, since the time for exposure is the time of shutter opening, i.e. shutter.So above-mentioned formula (3) can be with
It is transformed to：Intensity × aperture × shutter of light exposure=ambient light.
That is, when under natural light and not by flash lamp and reflector, ambient light can not change, therefore it is big
In most cases, control light exposure can be realized by changing the lens aperture of camera and changing aperture time.
Further, since sensitivity (International Standards Organization, referred to as ISO) is
Charge coupled cell (Charge-coupled Device, referred to as CCD) or complementary metal oxide half in terminal device
The film speed of conductor (Complementary Metal Oxide Semiconductor, referred to as CMOS), and sensitivity can
To be determined by formula (4).Therefore, the application can obtain the sense of the first camera and second camera according to formula (4)
Luminosity.
Specifically, the calculation of sensitivity such as formula (4)：
H*S=0.8 ... ... ... ... ... ... ... ... (4)
Wherein, H indicates that light exposure, S indicate sensitivity.
That is, the ISO numerical value the high, illustrate that the photoperceptivity of the sensitive component is stronger.
In turn, it after getting the light exposure and sensitivity of the first camera and second camera, is based in the application
The high dynamic range image acquisition device of dual camera, you can according to the light exposure of the first camera of above-mentioned acquisition and photosensitive
It spends, the light exposure and sensitivity of second camera, and the under-exposure offset determined according to the picture of second camera acquisition
And overexposure offset, determine the under-exposure offset of the corresponding target of the first camera and target overexposure offset.
Step 304, according to under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.
The high-dynamic-range image acquisition method based on dual camera of the embodiment of the present application, by using second camera
The corresponding each color channel histograms of preview screen currently acquired, determine under-exposure offset and overexposure offset, so
It is mended afterwards according to the first camera and the corresponding light exposure of second camera and sensitivity and under-exposure offset and overexposure
Value is repaid, the under-exposure offset of the corresponding target of the first camera and target overexposure offset are determined so as to owing to expose
The determination of light offset and overexposure offset is more acurrate reliable, and the high dynamic range images matter finally got is effectively ensured
Amount.
By above-mentioned analysis it is found that the application acquires picture progress preview by controlling the first camera, and control second
Camera acquires same frame, to adjust the exposure of second camera according to the corresponding each color channel histograms of above-mentioned picture
Value, until when determining that the corresponding each color channel histograms of picture of second camera acquisition meet preset condition, it is corresponding to owe
Exposure bias value and overexposure offset, then according to determining under-exposure offset and overexposure offset, front court is worked as in acquisition
The high dynamic range images of scape.For clearer explanation, corresponding under-exposure offset and overexposure under current scene are determined
The process of compensation.With reference to Fig. 4, by taking under-exposure offset as an example, to it is provided by the present application according to second camera acquisition
Picture determines that the process of under-exposure offset is further described.
Fig. 4 is the flow chart of another high-dynamic-range image acquisition method based on dual camera of the application.
As shown in figure 4, the high-dynamic-range image acquisition method based on dual camera of the application may include following step
Suddenly：
Step 401, preview screen is generated according to the picture of the first camera acquisition.
Step 402, the corresponding each color channel histograms of the first picture acquired according to second camera, determine that second takes the photograph
As corresponding first overexposure degree.
It, can be according to the corresponding each color channel histograms of the first picture, by the pixel of each Color Channel when specific implementation
Ratio is overlapped in the way of brightness from high to low, is until the folded addition and value of pixel ratio reaches pixel ratio threshold value
Only, then determine that the folded addition and value of pixel ratio reaches pixel ratio threshold position, corresponding brightness value.
It, can be by above-mentioned brightness value and normal exposure brightness after determining brightness value corresponding with pixel ratio threshold value
Threshold value is compared, to obtain the first overexposure degree of current scene.
Wherein, the first overexposure degree can be a concrete numerical value, or a numberical range, the application is to this
It is not especially limited.
Step 403, according to the first overexposure degree, the first under-exposure offset is determined.
When specific implementation, the first overexposure degree of current scene and normal exposure luminance threshold can be carried out to make poor place
Reason, to obtain corresponding difference, then determines the first under-exposure offset of current scene according to above-mentioned difference.
Step 404, according to the first under-exposure offset, control second camera acquires the second picture.
Step 405, according to the corresponding each color channel histograms of the second picture, judge corresponding second mistake of second camera
Depth of exposure whether within a preset range, if, thening follow the steps 406, otherwise, execute step 407.
Specifically, after control second camera acquires the second picture, by logical to the corresponding each color of the second picture
Road histogram is analyzed, whether within a preset range to determine the second overexposure degree.When the second overexposure degree that determines exists
When preset range, then it can determine that the first under-exposure offset is the corresponding under-exposure offset of second camera；When determining
Two depth of exposure then continue, according to the second overexposure, to determine the second under-exposure offset, and control second not in preset range
Camera obtains third picture according to the second under-exposure offset.
Step 406, determine that the first under-exposure offset is the corresponding under-exposure offset of second camera.
Step 407, according to the second overexposure degree, the second under-exposure offset is determined.
Step 408, according to the second under-exposure offset, control second camera acquires third picture, until according to second
The corresponding each color channel histograms of the most freshly harvested picture of camera determine the overexposure degree of second camera in default model
In enclosing.
That is, by constantly dividing the corresponding each color channel histograms of picture of second camera acquisition
Analysis, determines different under-exposure offsets, and controls second camera and adopted according to the under-exposure offset of iteration progress picture
Collection, until the overexposure degree of the corresponding each color channel histograms of picture of second camera acquisition reaches expected.
Likewise, when determining the first overexposure offset of current scene, with the first under-exposure benefit for determining current scene
The process for repaying value is similar, and unique distinctive points are, needs the pixel ratio in each Color Channel according to brightness from low to high
Incremental mode is overlapped.
Step 409, according to under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.
The high-dynamic-range image acquisition method based on dual camera of the embodiment of the present application, first according to the first camera
The picture of acquisition generates preview screen, then adjusts the exposure value of second camera, and determine the picture of second camera acquisition
When corresponding each color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset, so
Afterwards according to determining under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.Hereby it is achieved that
Using the picture of non-preview camera acquisition, dynamic determination best under-exposure offset corresponding with photographed scene and most preferably
Overexposure offset, to ensure the precision of determining under-exposure offset and overexposure offset, but also
The quality that the high dynamic range images finally obtained can be promoted, improves user experience.
In order to realize that above-described embodiment, the application also proposed a kind of high dynamic range images acquisition based on dual camera
Device.
Fig. 5 is the structural representation of the high dynamic range image acquisition device based on dual camera of the application one embodiment
Figure.
As shown in figure 5, the high dynamic range image acquisition device based on dual camera of the application includes：Generation module
110, determining module 111 and acquisition module 112.
Wherein, generation module 110 is used to generate preview screen according to the picture that the first camera acquires；
Determining module 111 is used to adjust the exposure value of second camera, determines the picture pair of the second camera acquisition
When each color channel histograms answered meet preset condition, corresponding under-exposure offset and overexposure offset；
The height that acquisition module 112 is used to obtain current scene according to the under-exposure offset and overexposure offset is dynamic
State range image.
In a kind of optional way of realization, the acquisition module 112, be specifically used for according to the under-exposure offset and
Overexposure offset obtains the high dynamic range figure of current scene using first camera and/or the second camera
Picture.
In a kind of optional way of realization, the acquisition module 112 is additionally operable to work as using first camera acquisition
The under-exposure image of preceding scene, while utilizing the overexposure light image of second camera acquisition current scene；It will be described current
Normal exposure image, under-exposure image and the overexposure light image of scene carry out fusion treatment, and the height for generating the current scene is dynamic
State range image.
In a kind of optional way of realization, high dynamic range images of the embodiment of the present application based on dual camera obtain dress
It sets, further includes：Adjustment module.
Wherein adjustment module, for reducing the current resolution ratio of second camera shooting.
It should be noted that aforementioned explaining to the high-dynamic-range image acquisition method embodiment based on dual camera
The bright high dynamic range image acquisition device based on dual camera for being also applied for the embodiment, realization principle is similar, herein
It repeats no more.
High dynamic range image acquisition device provided in this embodiment based on dual camera, first according to the first camera
The picture of acquisition generates preview screen, then adjusts the exposure value of second camera, and determine the picture of second camera acquisition
When corresponding each color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset, so
Afterwards according to determining under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.Hereby it is achieved that
By using non-preview camera the picture color histogram of acquisition is analyzed in real time, it is corresponding with photographed scene to obtain
Best under-exposure offset and best overexposure offset, to be compensated according to best under-exposure offset and best overexposure
Value, obtains the high dynamic range images of photographed scene, can not only ensure determining under-exposure offset and overexposure offset
Precision, but also the high dynamic range images quality finally shot can be promoted.
Fig. 6 is that the structure of the high dynamic range image acquisition device based on dual camera of the application another embodiment is shown
It is intended to.
Referring to Fig. 6, being somebody's turn to do the high dynamic range image acquisition device based on dual camera may include：
Wherein, generation module 110 is used to generate preview screen according to the picture that the first camera acquires；
Determining module 111 is used to adjust the exposure value of second camera, determines the picture pair of the second camera acquisition
When each color channel histograms answered meet preset condition, corresponding under-exposure offset and overexposure offset；
In a kind of optional way of realization, high dynamic range images of the embodiment of the present application based on dual camera obtain dress
It sets, further includes：Second determining module 113.
Wherein, the second determining module 113 is used to be taken the photograph according to the corresponding light exposure of first camera and sensitivity, second
As corresponding light exposure and sensitivity and the under-exposure offset and overexposure offset, first camera is determined
Corresponding target is under-exposure offset and target overexposure offset.
The height that acquisition module 112 is used to obtain current scene according to the under-exposure offset and overexposure offset is dynamic
State range image.
It should be noted that aforementioned explaining to the high-dynamic-range image acquisition method embodiment based on dual camera
The bright high dynamic range image acquisition device based on dual camera for being also applied for the embodiment, realization principle is similar, herein
It repeats no more.
The high dynamic range image acquisition device based on dual camera of the embodiment of the present application, by using second camera
The corresponding each color channel histograms of preview screen currently acquired, determine under-exposure offset and overexposure offset, so
It is mended afterwards according to the first camera and the corresponding light exposure of second camera and sensitivity and under-exposure offset and overexposure
Value is repaid, the under-exposure offset of the corresponding target of the first camera and target overexposure offset are determined so as to owing to expose
The determination of light offset and overexposure offset is more acurrate reliable, and the high dynamic range images matter finally got is effectively ensured
Amount.
Fig. 7 is that the structure of the high dynamic range image acquisition device based on dual camera of the application another embodiment is shown
It is intended to.
Referring to Fig. 7, being somebody's turn to do the high dynamic range image acquisition device based on dual camera may include：
Wherein, generation module 110 is used to generate preview screen according to the picture that the first camera acquires；
In a kind of optional way of realization, high dynamic range images of the embodiment of the present application based on dual camera obtain dress
It sets, further includes：Third determining module 114, the 4th determining module 115, the first control module 116, judgment module the 117, the 5th are true
Cover half block 118, the 6th determining module 119 and the second control module 120.
Wherein, the corresponding each color of the first picture that third determining module 114 is used to be acquired according to the second camera
Channel histogram determines the corresponding first overexposure degree of the second camera；
4th determining module 115 is used to, according to the first overexposure degree, determine the first under-exposure offset；
First control module 116 is used for according to the described first under-exposure offset, controls the second camera acquisition the
Two pictures；
Judgment module 117 is used to, according to the corresponding each color channel histograms of second picture, judge that described second takes the photograph
Whether within a preset range as corresponding second overexposure degree；
5th determining module 118 is used for if so, determining that the first under-exposure offset is the second camera pair
The under-exposure offset answered.
6th determining module 119 is used to, if it is not, then according to the second overexposure degree, determine the second under-exposure compensation
Value；
Second control module 120 is used for according to the described second under-exposure offset, controls the second camera acquisition the
Three pictures determine described the until according to the corresponding each color channel histograms of the most freshly harvested picture of the second camera
The overexposure degree of two cameras is within a preset range.
The height that acquisition module 112 is used to obtain current scene according to the under-exposure offset and overexposure offset is dynamic
State range image.
It should be noted that aforementioned explaining to the high-dynamic-range image acquisition method embodiment based on dual camera
The bright high dynamic range image acquisition device based on dual camera for being also applied for the embodiment, realization principle is similar, herein
It repeats no more.
The high dynamic range image acquisition device based on dual camera of the embodiment of the present application, first according to the first camera
The picture of acquisition generates preview screen, then adjusts the exposure value of second camera, and determine the picture of second camera acquisition
When corresponding each color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset, so
Afterwards according to determining under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.Hereby it is achieved that
Using the picture of non-preview camera acquisition, dynamic determination best under-exposure offset corresponding with photographed scene and most preferably
Overexposure offset, to ensure the precision of determining under-exposure offset and overexposure offset, but also
The quality that the high dynamic range images finally obtained can be promoted, improves user experience.
In order to realize that above-described embodiment, the application also propose a kind of terminal device.
Fig. 8 is the structural schematic diagram of the terminal device of the application one embodiment.
Referring to Fig. 8, the application terminal device 100 includes memory 210, processor 220 and camera module 230；
The camera module 230 is used to obtain the image under present filming scene；
The memory 210 is for storing executable program code；
The processor 220 be used to read the executable program code that is stored in the memory 210 run with it is described
The corresponding program of executable program code, for realizing the high dynamic range based on dual camera described in first aspect embodiment
Enclose image acquiring method.
Wherein, terminal device can be the arbitrary hardware device with dual camera in the present embodiment, such as smart mobile phone,
Camera, personal computer (personal computer, referred to as PC) etc., the application is not especially limited this.
It should be noted that aforementioned explaining to the high-dynamic-range image acquisition method embodiment based on dual camera
The bright terminal device for being also applied for the embodiment, realization principle is similar, and details are not described herein again.
In terminal device provided in this embodiment, preview screen is generated according to the picture of the first camera acquisition first, so
The exposure value of second camera is adjusted afterwards, and determines that the corresponding each color channel histograms of the picture of second camera acquisition meet
When preset condition, corresponding under-exposure offset and overexposure offset, then according to determining under-exposure offset and
Overexposure offset obtains the high dynamic range images of current scene.Hereby it is achieved that by using non-preview camera to adopting
The picture color histogram of collection is analyzed in real time, to obtain best under-exposure offset corresponding with photographed scene and best mistake
Exposure bias value, to according to best under-exposure offset and best overexposure offset, obtain the high dynamic range of photographed scene
Image is enclosed, can not only ensure the precision of determining under-exposure offset and overexposure offset, but also can be promoted most
The high dynamic range images quality shot eventually.
In order to realize that above-described embodiment, the application also proposed a kind of computer readable storage medium.
The computer readable storage medium, is stored thereon with computer program, which realizes when being executed by processor
The high-dynamic-range image acquisition method based on dual camera of one side embodiment.
In this application unless specifically defined or limited otherwise, the terms such as term " setting ", " connection " should do broad sense reason
Solution, for example, it may be mechanical connection, can also be electrical connection；It can be directly connected, the indirect phase of intermediary can also be passed through
Even, can be the interaction relationship of the connection or two elements inside two elements, unless otherwise restricted clearly.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in this application can be understood as the case may be.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the application includes other realization, wherein can not press shown or discuss suitable
Sequence, include according to involved function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be by the application
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the application can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that realize all or part of step that above-described embodiment method carries
Suddenly it is that relevant hardware can be instructed to complete by program, the program can be stored in a kind of computer-readable storage medium
In matter, which includes the steps that one or a combination set of embodiment of the method when being executed.
Storage medium mentioned above can be read-only memory, disk or CD etc..Although having been shown and retouching above
Embodiments herein is stated, it is to be understood that above-described embodiment is exemplary, and should not be understood as the limit to the application
System, those skilled in the art can be changed above-described embodiment, change, replace and become within the scope of application
Type.
Claims (10)
1. a kind of high-dynamic-range image acquisition method based on dual camera, which is characterized in that including：
Preview screen is generated according to the picture of the first camera acquisition；
The exposure value for adjusting second camera determines the corresponding each color channel histograms of picture of the second camera acquisition
When meeting preset condition, corresponding under-exposure offset and overexposure offset；
According to the under-exposure offset and overexposure offset, the high dynamic range images of current scene are obtained.
2. the method as described in claim 1, which is characterized in that the exposure value of the adjustment second camera determines institute
Picture corresponding each color channel histograms of second camera acquisition are stated when meeting preset condition, corresponding under-exposure benefit
Value and overexposure offset are repaid, including：
According to the corresponding each color channel histograms of the first picture that the second camera acquires, the second camera is determined
Corresponding first overexposure degree；
According to the first overexposure degree, the first under-exposure offset is determined；
According to the described first under-exposure offset, controls the second camera and acquire the second picture；
According to the corresponding each color channel histograms of second picture, corresponding second overexposure of the second camera is judged
Within a preset range whether degree；
If so, determining that the first under-exposure offset is the corresponding under-exposure offset of the second camera.
3. method as claimed in claim 2, which is characterized in that described to judge corresponding second overexposure of the second camera
Degree whether it is within the preset range, further includes：
If it is not, then determining the second under-exposure offset according to the second overexposure degree；
According to the described second under-exposure offset, the second camera acquisition third picture is controlled, until according to described second
The corresponding each color channel histograms of the most freshly harvested picture of camera determine the overexposure degree of the second camera pre-
If in range.
4. the method as described in claim 1, which is characterized in that described to be compensated according to the under-exposure offset and overexposure
Value, obtains the high dynamic range images of current scene, including：
According to the under-exposure offset and overexposure offset, first camera and/or the second camera are utilized
Obtain the high dynamic range images of current scene.
5. method as claimed in claim 4, which is characterized in that first camera and the second camera are corresponding respectively
Different light exposures and/or sensitivity；
Before the high dynamic range images for obtaining current scene using first camera and the second camera, also
Including：
According to the corresponding light exposure of first camera and the corresponding light exposure of sensitivity, second camera and sensitivity and
The under-exposure offset and overexposure offset determine the under-exposure offset of the corresponding target of first camera and target
Overexposure offset.
6. method as described in claim 4 or 5, which is characterized in that described to utilize first camera and/or described second
Camera obtains the high dynamic range images of current scene, including：
The under-exposure image of current scene is obtained using first camera, while being obtained currently using the second camera
The overexposure light image of scene；
The normal exposure image, under-exposure image and overexposure light image of the current scene are subjected to fusion treatment, described in generation
The high dynamic range images of current scene.
7. method according to any one of claims 1 to 5, which is characterized in that the exposure value of the adjustment second camera it
Before, further include：
Reduce the current resolution ratio of second camera shooting.
8. a kind of high dynamic range image acquisition device based on dual camera, which is characterized in that including：
Generation module, the picture for being acquired according to the first camera generate preview screen；
Determining module, the exposure value for adjusting second camera determine that the picture of the second camera acquisition is corresponding each
When color channel histograms meet preset condition, corresponding under-exposure offset and overexposure offset；
Acquisition module, for according to the under-exposure offset and overexposure offset, obtaining the high dynamic range of current scene
Image.
9. a kind of terminal device, which is characterized in that including：Memory, processor and camera module；
The camera module, for obtaining the image under present filming scene；
The memory, for storing executable program code；
The processor is run and the executable program for reading the executable program code stored in the memory
The corresponding program of code, for realizing the high dynamic range images based on dual camera as described in claim 1-7 is any
Acquisition methods.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program quilt
The high-dynamic-range image acquisition method based on dual camera as described in claim 1-7 is any is realized when processor executes.
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