CN105592270B - image brightness compensation method, device and terminal device - Google Patents
image brightness compensation method, device and terminal device Download PDFInfo
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- 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
The present invention proposes a kind of image brightness compensation method, device and terminal device, wherein, the imaging sensor being provided previously by includes：Photosensitive pixel array, and the optical filter being arranged on photosensitive pixel array, optical filter include filter unit array, and each filter unit covers multiple photosensitive pixels and forms merging pixel；When the output of the multiple photosensitive pixels belonged in same merging pixel is added into acquisition pixel value generation merging image, whether the merging pixel for detecting corner reaches predetermined luminance；If so, then according to default compensation policy, with reference to the pixel value of the merging pixel of corner, brightness is carried out to remaining merging pixel and constrains compensation.Realize and the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness uniformity of entire image, noise has also obtained certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
Description
Technical field
The present invention relates to technical field of image processing, more particularly to a kind of image brightness compensation method, device and terminal to set
It is standby.
Background technology
Because camera lens and eyeglass are all smaller, light-inletting quantity is restricted.Meanwhile successively decreasing for concentric-ring pattern is presented in brightness of image,
In order to ensure the uniformity of brightness of image, it is necessary to carry out enhancing compensation to corner pixel brightness, the generation at dark angle is avoided.But
Also while noise is enhanced while being compensated to dark side angle, and the image denoising processing to the later stage brings considerable influence.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.
Therefore, first purpose of the present invention is to propose a kind of image brightness compensation method, opposite side the method achieve
The pixel at angle to center carries out brightness and constrains compensation, so that the brightness uniformity of entire image, noise has also obtained necessarily
Compacting, improve picture quality, the image denoising to the later stage alleviates burden.
Second object of the present invention is to propose a kind of brightness of image compensation device.
Third object of the present invention is to propose a kind of terminal device.
For the above-mentioned purpose, first aspect present invention embodiment proposes a kind of image brightness compensation method, including：In advance
The imaging sensor of offer includes：Photosensitive pixel array, and the optical filter being arranged on the photosensitive pixel array, wherein,
The optical filter includes filter unit array, and each filter unit covers multiple photosensitive pixels and forms merging pixel；The side
Method comprises the following steps：
When the output according to the photosensitive pixel array, by the output of the multiple photosensitive pixels belonged in same merging pixel
When being added acquisition pixel value generation merging image, whether detection reaches default bright positioned at the merging pixel for merging image corner
Degree；If it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, with reference to the conjunction of the corner
And the pixel value of pixel, brightness is carried out to remaining merging pixel and constrains compensation.
The image brightness compensation method of the embodiment of the present invention, it is same by belonging to when the output according to the photosensitive pixel array
When one output for merging multiple photosensitive pixels in pixel is added acquisition pixel value generation merging image, detection is located at the merging
Whether the merging pixel of image corner reaches predetermined luminance；If it is determined that the merging pixel of the corner reaches predetermined luminance, then root
According to default compensation policy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains benefit
Repay.Hereby it is achieved that the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness of entire image is equal
Even, noise has also obtained certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
For the above-mentioned purpose, second aspect of the present invention embodiment proposes a kind of brightness of image compensation device, including：Image
Sensor and image processor, wherein,
Described image sensor includes：Photosensitive pixel array, and the optical filter being arranged on the photosensitive pixel array,
Wherein, the optical filter includes filter unit array, and each filter unit covers multiple photosensitive pixels and forms merging pixel；
Described image processor includes：Detection module, it is same by belonging to for working as the output according to the photosensitive pixel array
When one output for merging multiple photosensitive pixels in pixel is added acquisition pixel value generation merging image, detection is located at the merging
Whether the merging pixel of image corner reaches predetermined luminance；Compensating module, for if it is determined that the merging pixel of the corner reaches
Predetermined luminance, then according to default compensation policy, with reference to the pixel value of the merging pixel of the corner, remaining merging pixel is entered
Compensation is constrained in row brightness.
The brightness of image compensation device of the embodiment of the present invention, it is same by belonging to when the output according to the photosensitive pixel array
When one output for merging multiple photosensitive pixels in pixel is added acquisition pixel value generation merging image, detection is located at the merging
Whether the merging pixel of image corner reaches predetermined luminance；If it is determined that the merging pixel of the corner reaches predetermined luminance, then root
According to default compensation policy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains benefit
Repay.Hereby it is achieved that the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness of entire image is equal
Even, noise has also obtained certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
For the above-mentioned purpose, third aspect present invention embodiment proposes a kind of terminal device, including figure as described above
Image brightness compensation device.
The terminal device of the embodiment of the present invention, when the output according to the photosensitive pixel array, same merging picture will be belonged to
When the output of multiple photosensitive pixels in element is added acquisition pixel value generation merging image, detection merges image corner positioned at described
Merging pixel whether reach predetermined luminance；If it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default
Compensation policy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains compensation.Thus,
Realize and the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness uniformity of entire image, noise
Certain compacting has been obtained, has improved picture quality, the image denoising to the later stage alleviates burden.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the dimensional structure diagram of imaging sensor provided in an embodiment of the present invention；
Fig. 2 is the flow chart of the image brightness compensation method of one embodiment of the invention；
Fig. 3 is the filter unit array schematic diagram in imaging sensor provided by the invention；
Fig. 4 is merging pel array schematic diagram provided by the invention；
Fig. 5 is the flow chart of the image brightness compensation method of another embodiment of the present invention；
Fig. 6 is the flow chart of the image brightness compensation method of another embodiment of the present invention；
Fig. 7 is the structural representation of the brightness of image compensation device of another embodiment of the present invention；
Fig. 8 is the structural representation of the terminal device of one embodiment of the invention；
Fig. 9 is the structural representation of the terminal device of another embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the image brightness compensation method, device and terminal device of the embodiment of the present invention are described.
Specifically, the dead pixel compensation method for the imaging sensor that the present embodiment provides is configured in imaging sensor
It is specifically described in terminal device.It should be noted that the type of terminal device is a lot, such as：Mobile phone, IPAD, intelligence are worn
Wear equipment etc..
Fig. 1 is the dimensional structure diagram of imaging sensor provided in an embodiment of the present invention.
Imaging sensor 1 as shown in Figure 1 is set in terminal device in advance, wherein, imaging sensor 1 can be CCD
Or cmos sensor.
Referring to Fig. 1, imaging sensor 1 includes：Photosensitive pixel array 11, and be arranged on the photosensitive pixel array 11
Optical filter, wherein, the optical filter includes filter unit array 12, and each filter unit 121 covers multiple photosensitive pixels 111
And form merging pixel.
Because the real-time luminosity of environment is a key factor of influence imaging sensor image quality, when photo environment
When brightness is too low, there is excessive image noise in the image of generation so that fogging image.
, can be according to the reality of environment based on the imaging sensor 1 of Fig. 1 offers in the present embodiment in order to solve the above problems
Shi Guangliang situations, it is determined whether according to the output of photosensitive pixel array 11, by multiple photosensitive pixels 111 in same merging pixel
Output be added and obtain pixel value, output and the image of real-time bright situation respective pixel.
Therefore, based on above-mentioned Fig. 1 imaging sensors provided and different image formation modes, implement the present invention and provide
Image brightness compensation method.It is specific as follows：
Fig. 2 is the flow chart of the image brightness compensation method of one embodiment of the invention.
As shown in Fig. 2 the image brightness compensation method comprises the following steps：
Step 101, when the output according to the photosensitive pixel array, multiple light-sensitive images in same merging pixel will be belonged to
When the output of element is added acquisition pixel value generation merging image, whether detection reaches positioned at the merging pixel for merging image corner
To predetermined luminance.
Specifically, referring to Fig. 1, when each photosensitive pixel 111 in photosensitive pixel array 11 is known in imaging sensor in detection
Light-inletting quantity it is smaller when, illustrate that the photosensitive degree of current environment is poor, image noise is more, cause output image it is very unclear
Chu.Therefore, it is necessary to according to the output of each photosensitive pixel 111 in photosensitive pixel array 11, will belong in same merging pixel
The output of multiple photosensitive pixels, which be added, obtains pixel value, to improve light-inletting quantity, makes up single photosensitive pixel light-inletting quantity deficiency
The defects of, and then generate and merge image, so as to improve the definition of output image.
In order to which more clearly the output of the multiple photosensitive pixels belonged in same merging pixel is added acquisition picture by description
Element value generation merges the process of image, is described as follows with reference to Fig. 3-Fig. 4：
Fig. 3 is the filter unit array schematic diagram in imaging sensor provided by the invention.
Fig. 4 is merging pel array schematic diagram provided by the invention.
Referring to Fig. 1 and Fig. 3, illustrated so that each filter unit 121 covers 2*2 photosensitive pixel 111 as an example：
The output for the 2*2 photosensitive pixel that each filter unit 121 is covered is added, in other words, will be adjacent respectively
The output of color identical photosensitive pixel merge into a monochromatic pixel.Due to the fine difference of illumination, each photosensitive pixel
Output corresponding to 111 may also be different, therefore the pixel value for merging pixel combines the output of its 2*2 photosensitive pixel 111.
The pixel of the merging image of generation is reduced by as original 1/4, referring to Fig. 4.
Such as：If the photosensitive pixel array 11 of imaging sensor 1 is 16M, the 2*2 that each filter unit 121 covers is individual
Photosensitive pixel 111 and the merging pixel formed, the output of 4 photosensitive pixels in each merging pixel is added and reads pixel
Value, the pixel of the merging image of generation are reduced by as 4M.
As described above, when the output according to the photosensitive pixel array, it is multiple photosensitive in same merging pixel by belonging to
When the output of pixel is added acquisition pixel value generation merging image, the light quantity that imaging sensor obtains greatly increases, and sensitivity is big
It is big to improve.Such as：
With continued reference to shown in Fig. 3 and Fig. 4, the image of generation becomes 4M from 16M, equivalent to each pixel in imaging sensor
Point add 4 times, the sensitivity of imaging sensor greatly improves, thus light-inletting quantity concentrically round type successively decrease degree reduction.Change sentence
Talk about, be exactly that the brightness of output image corner and the luminance difference at center greatly reduce.
At this time, it may be necessary to detect positioned at whether the merging pixel for merging image corner reaches predetermined luminance, to determine corner
Brightness can reach the requirement of vision.
It should be noted that different detection modes can be used according to different application scenarios, detection is positioned at merging figure
As whether the merging pixel of corner reaches predetermined luminance, the present embodiment is without limitation.It is illustrated below：
The first example：Corner brightness is detected by the average pixel value of the merging pixel of all corners, specifically included：
Obtain the average pixel value of the merging pixel of all corners, and the average pixel value and default first threshold
The size of value.
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches pre-
If brightness；If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness.
Second of example：Corner brightness is detected by the minimum pixel value of the merging pixel of all corners, specifically included：
Obtain the minimum pixel value of the merging pixel of all corners, and the minimum pixel value and default second threshold
The size of value.
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches pre-
If brightness；If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness.
The third example：Difference by the merging pixel of corner and the pixel value for merging pixel at center is bright to detect corner
Degree, is specifically included：
First, the average pixel value of the merging pixel of all corners is obtained.
Then, obtain positioned at it is described merging picture centre mergings pixel pixel value and the average pixel value it is poor
Absolute value, and the absolute value and the size of default 3rd threshold value.
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness；If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
Step 102, however, it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, ginseng
The pixel value of the merging pixel of the corner is examined, carrying out brightness to remaining merging pixel constrains compensation.
Specifically, however, it is determined that the merging pixel of the corner reaches predetermined luminance, illustrates due to by same merging pixel
The output of multiple photosensitive pixels is added, and causes the increase of light-inletting quantity, the brightness for merging pixel greatly promotes so that the brightness of corner
The requirement of vision can be reached.
Thus, when being compensated to brightness of image, no longer using center as reference brightness, lifting compensation is done to corner, this
Sample can bring larger noise, influence picture quality.The luminance compensation method of the offer of the present embodiment is according to default compensation
Strategy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains compensation.
It should be noted that it can be set according to specific application scenarios or adjust compensation policy, with reference to the conjunction of corner
And the pixel value of pixel, brightness is carried out to remaining merging pixel by different mode and standard and constrains compensation.Such as：
Can be previously according to merging pixel to be compensated and distance and the image compensation between merging pixel positioned at center
Object brightness corresponding mathematical modeling is set.And then according to the data model, with reference to the pixel value of the merging pixel of corner,
Brightness is carried out to remaining merging pixel and constrains compensation.
Or
Can be bright including center previously according to the object brightness of different brightness case setting images, the object brightness of image
Luminance difference amplitude in degree, certain distance, so as to generate matched curve.And then according to the matched curve, with reference to the conjunction of corner
And the pixel value of pixel, brightness is carried out to remaining merging pixel and constrains compensation.
It is emphasized that the specific manifestation shape of the pixel value of the merging pixel of corner referenced in above-mentioned compensation process
Formula has a lot, can be configured and adjust according to concrete application scene, the present embodiment is not restricted to this.Such as：
The average pixel value of the merging pixel of all corners is may be referred to, or,
It may be referred to the minimum pixel value of the merging pixel of all corners.
The image brightness compensation method that the present embodiment provides, it is same by belonging to when the output according to the photosensitive pixel array
When one output for merging multiple photosensitive pixels in pixel is added acquisition pixel value generation merging image, detection is located at the merging
Whether the merging pixel of image corner reaches predetermined luminance, however, it is determined that corner reaches predetermined luminance, then according to default compensation plan
Slightly, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains compensation.Hereby it is achieved that
The oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness uniformity of entire image, noise also obtain
Certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
Based on above-described embodiment, for step 102, compensation plan can be set or adjusted according to specific application scenarios
Slightly, with reference to the pixel value of the merging pixel of corner, brightness is carried out to remaining merging pixel by different mode and standard and constrained
Compensation, is illustrated by subsequent embodiment：
Fig. 5 is the flow chart of the image brightness compensation method of another embodiment of the present invention.
As shown in figure 5, being directed to above-mentioned steps 102, the image brightness compensation method comprises the following steps：
Step 201, the brightness case of current environment is detected.
Step 202, default compensation matched curve corresponding with the brightness case is obtained.
Step 203, the average pixel value of the merging pixel of all corners is obtained.
Step 204, brightness is carried out to remaining merging pixel with reference to the average pixel value according to the compensation matched curve
Constrain compensation.
Specifically, according to the brightness case of the current environment detected, default compensation corresponding with brightness case is obtained
Matched curve.Wherein it is possible to bright situation is detected in several ways, such as：
The photosensitive information of environment can be obtained, whether reaches default according to the bright situation of photosensitive infomation detection photo environment
Brightness.
Wherein, the particular content of photosensitive information is a lot, such as：Sensitivity value is ISO values, or, the automatic exposure of camera lens
It is worth (Automatic Exposure, AE).Therefore, can be needed to obtain photo environment by different photo-sensitive cells according to application
Photosensitive information, the present embodiment is not restricted to this.
Then, the average pixel value of the merging pixel of all corners is obtained, and then according to corresponding with real-time bright situation
Compensate matched curve and the oppressive compensation of brightness is carried out to remaining merging pixel with reference to the average pixel value.Such as：Intended according to compensation
The amplitude for closing curve adds the first negative value, the pixel of the merging pixel at center 1/2 of adjusting the distance to the pixel value of center merging pixel
Value adds the second negative value, wherein, the second negative value is less than the first negative value, constrains so as to carry out brightness to remaining merging pixel successively
Compensation.
The image brightness compensation method that the present embodiment provides, by detecting the brightness case of current environment, obtain default
It is corresponding with the brightness case to compensate matched curve, the average pixel value of all corners is referred to according to the compensation matched curve
Brightness is carried out to remaining merging pixel and constrains compensation.Hereby it is achieved that the oppressive benefit of brightness is carried out to the pixel of corner to center
Repay, so that the brightness uniformity of entire image, noise has also obtained certain compacting, improves picture quality, the figure to the later stage
As denoising alleviates burden.
Fig. 6 is the flow chart of the image brightness compensation method of another embodiment of the present invention.
As shown in fig. 6, being directed to above-mentioned steps 102, the image brightness compensation method comprises the following steps：
Step 301, the minimum pixel value of the merging pixel of all corners is obtained.
Step 302, the standard successively decreased according to the brightness of image from center to corner with radius squared inverse, with reference to it is described most
Small pixel value carries out brightness to remaining merging pixel and constrains compensation.
Specifically, obtain the minimum pixel value of the merging pixel of all corners, so according to the brightness of image from center to
The standard that corner is successively decreased with radius squared inverse, brightness is carried out to remaining merging pixel with reference to the minimum pixel value and constrains benefit
Repay.Such as：The pixel value for merging pixel to center according to the amplitude of compensation matched curve adds the 3rd negative value, center 3/ of adjusting the distance
The pixel value of 5 merging pixel adds the 4th negative value, wherein, the 4th negative value is less than the 3rd negative value, so as to be closed successively to remaining
And pixel carries out brightness and constrains compensation so that the brightness of the image after brightness is oppressive meets to fall with radius squared from center to corner
The standard that number successively decreases.
The image brightness compensation method that the present embodiment provides, is put down by the brightness according to image from center to corner with radius
The standard that square inverse successively decreases, brightness pressure is carried out to remaining merging pixel with reference to the minimum pixel value of the merging pixel of all corners
Suppression compensation.Hereby it is achieved that the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness of entire image
Uniformly, noise has also obtained certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
Based on above-described embodiment, further, in addition to：
If it is determined that the merging pixel of the corner is not reaching to predetermined luminance, will be multiple in same merging pixel although illustrating
The output of photosensitive pixel is added, but because bright situation at that time or the pixel quantity of merging are very few, causes light-inletting quantity still
So deficiency so that the brightness of corner can't reach the requirement of vision.
Thus, it is right with reference to the pixel value of the merging pixel positioned at the merging picture centre according to default compensation policy
Remaining merges pixel and carries out luminance raising compensation.
In order to realize above-described embodiment, the present invention also proposes a kind of brightness of image compensation device.
Fig. 7 is the structural representation of the brightness of image compensation device of one embodiment of the invention.
As shown in fig. 7, the brightness of image compensation device includes：
Imaging sensor 1 and image processor 2, wherein,
The structure of described image sensor 1 specifically includes referring to Fig. 1：Photosensitive pixel array 11, and it is arranged on the sense
Optical filter in light image pixel array 11, wherein, the optical filter includes filter unit array 12, and each filter unit 121 covers
Multiple photosensitive pixels 111 simultaneously form merging pixel；
Described image processor 2 includes：Detection module 21 and compensating module 22, wherein,
Detection module 21, for working as the output according to the photosensitive pixel array, it will belong to more in same merging pixel
When the output of individual photosensitive pixel is added acquisition pixel value generation merging image, detection is positioned at the merging picture for merging image corner
Whether element reaches predetermined luminance；
Specifically, in one embodiment, the detection module 21 is used for：
Obtain the average pixel value of the merging pixel of all corners；
Compare the size of the average pixel value and default first threshold；
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches pre-
If brightness；
If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness.
In another embodiment, the detection module 21 is used for：
Obtain the minimum pixel value of the merging pixel of all corners；
Compare the size of the minimum pixel value and default Second Threshold；
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches pre-
If brightness；
If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness.
In another embodiment, the detection module 21 is used for：
Obtain the average pixel value of the merging pixel of all corners；
Obtain the poor absolute of pixel value and the average pixel value of the merging pixel positioned at the merging picture centre
Value；
Compare the size of the absolute value and default 3rd threshold value；
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to pre-
If brightness；
If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
Compensating module 22, for if it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation
Strategy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains compensation.
Specifically, in one embodiment, the compensating module 22 is used for：
The standard successively decreased according to the brightness of image from center to corner with radius squared inverse, with reference to the merging of the corner
The pixel value of pixel carries out brightness to remaining merging pixel and constrains compensation.
Specifically, in another embodiment,
The detection module 21 is additionally operable to：Detect the brightness case of current environment；
Wherein, the detection module 21 is used for：
Obtain the photosensitive information of current environment；
According to the photosensitive information and the brightness case of predetermined threshold value detection current environment.
The compensating module 22 is used for：The compensating module is used for：According to default benefit corresponding with the brightness case
Matched curve is repaid, the oppressive compensation of brightness is carried out to remaining merging pixel with reference to the pixel value of the merging pixel of the corner.
Based on above-described embodiment, the pixel value of the merging pixel with reference to the corner, including：
With reference to the average pixel value of the merging pixel of all corners, or,
With reference to the minimum pixel value of the merging pixel of all corners.
It should be noted that the foregoing explanation to image brightness compensation method embodiment is also applied for the embodiment
Brightness of image compensation device, here is omitted.
The brightness of image compensation device of the embodiment of the present invention, it is same by belonging to when the output according to the photosensitive pixel array
When one output for merging multiple photosensitive pixels in pixel is added acquisition pixel value generation merging image, detection is located at the merging
Whether the merging pixel of image corner reaches predetermined luminance；If it is determined that the merging pixel of the corner reaches predetermined luminance, then root
According to default compensation policy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains benefit
Repay.Hereby it is achieved that the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness of entire image is equal
Even, noise has also obtained certain compacting, improves picture quality, and the image denoising to the later stage alleviates burden.
Based on above-described embodiment, in another embodiment, the compensating module 22 is additionally operable to：
If it is determined that the merging pixel of the corner is not reaching to predetermined luminance, then according to default compensation policy, reference bit
In the pixel value of the merging pixel of the merging picture centre, luminance raising compensation is carried out to remaining merging pixel.
In order to realize above-described embodiment, the present invention also proposes a kind of terminal device.The terminal device includes：Example is performed as described above
The brightness of image compensation device carried.
Wherein, the terminal equipment type is a lot, such as including：Mobile phone, IPAD or, Intelligent worn device.
It should be noted that the foregoing explanation to image brightness compensation method embodiment is also applied for the embodiment
Terminal device, here is omitted.
The terminal device of the embodiment of the present invention, when the output according to the photosensitive pixel array, same merging picture will be belonged to
When the output of multiple photosensitive pixels in element is added acquisition pixel value generation merging image, detection merges image corner positioned at described
Merging pixel whether reach predetermined luminance；If it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default
Compensation policy, with reference to the pixel value of the merging pixel of the corner, brightness is carried out to remaining merging pixel and constrains compensation.Thus,
Realize and the oppressive compensation of brightness is carried out to the pixel of corner to center, so that the brightness uniformity of entire image, noise
Certain compacting has been obtained, has improved picture quality, the image denoising to the later stage alleviates burden.
Fig. 8 is the structural representation of the terminal device of one embodiment of the invention, as shown in figure 8, the terminal device includes：
Brightness of image compensation device 10, the central processing unit 20 and external memory 30 being connected with described image luminance compensating mechanism 10, institute
Central processing unit 20 is stated to be used to control the storage image of external memory 30.
It should be noted that the foregoing explanation to image brightness compensation method embodiment is also applied for the embodiment
Terminal device, its realization principle is similar, and here is omitted.
Fig. 9 is the structural representation of the terminal device of another embodiment of the present invention, as shown in figure 9, the terminal device bag
Include：Brightness of image compensation device 10, the central processing unit 20 being connected with described image luminance compensating mechanism 10 and display device 40,
The central processing unit 20 is used to control the display image of display device 40.
It should be noted that the foregoing explanation to image brightness compensation method embodiment is also applied for the embodiment
Terminal device, its realization principle is similar, and here is omitted.
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 the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include
Module, fragment or the portion of the code of the executable instruction of one or more the step of being used to realize specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress used with reference to these instruction execution systems, device or equipment
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wiring
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium, which can even is that, to print the paper of described program thereon or other are suitable
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, 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, have 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 to realize all or part of step that above-described embodiment method carries
Suddenly it is that by program the hardware of correlation can be instructed to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in each embodiment of the present invention can be integrated in a proxy module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although have been shown and retouch above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (22)
1. a kind of image brightness compensation method, it is characterised in that the imaging sensor being provided previously by includes：Photosensitive pixel array,
And the optical filter on the photosensitive pixel array is arranged on, wherein, the optical filter includes filter unit array, each to filter
Unit covers multiple photosensitive pixels and forms merging pixel；It the described method comprises the following steps：
When the output according to the photosensitive pixel array, the output of the multiple photosensitive pixels belonged in same merging pixel is added
When obtaining pixel value generation merging image, whether merging pixel of the detection positioned at the merging image corner reaches predetermined luminance；
If it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, with reference to the corner
Merge the pixel value of pixel, carrying out brightness to remaining merging pixel constrains compensation, wherein, it is described according to default compensation policy,
The oppressive compensation of brightness is carried out to remaining merging pixel with reference to the pixel value of the merging pixel of the corner, including：Front ring is worked as in detection
The brightness case in border；Obtain default compensation matched curve corresponding with the brightness case；Obtain the merging picture of all corners
The average pixel value of element；Brightness pressure is carried out to remaining merging pixel with reference to the average pixel value according to the compensation matched curve
Suppression compensation；
If it is determined that the merging pixel of the corner is not reaching to predetermined luminance, then according to default compensation policy, with reference to positioned at institute
The pixel value for the merging pixel for merging picture centre is stated, luminance raising compensation is carried out to remaining merging pixel.
2. the method as described in claim 1, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the average pixel value of the merging pixel of all corners；
Compare the size of the average pixel value and default first threshold；
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
3. the method as described in claim 1, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the minimum pixel value of the merging pixel of all corners；
Compare the size of the minimum pixel value and default Second Threshold；
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
4. the method as described in claim 1, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the average pixel value of the merging pixel of all corners；
Obtain the poor absolute value of the pixel value and the average pixel value of the merging pixel positioned at the merging picture centre；
Compare the size of the absolute value and default 3rd threshold value；
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to default bright
Degree；
If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
5. the method as described in claim 1, it is characterised in that the brightness case of the detection current environment, including：
Obtain the photosensitive information of current environment；
According to the photosensitive information and the brightness case of predetermined threshold value detection current environment.
6. a kind of image brightness compensation method, it is characterised in that the imaging sensor being provided previously by includes：Photosensitive pixel array,
And the optical filter on the photosensitive pixel array is arranged on, wherein, the optical filter includes filter unit array, each to filter
Unit covers multiple photosensitive pixels and forms merging pixel；It the described method comprises the following steps：
When the output according to the photosensitive pixel array, the output of the multiple photosensitive pixels belonged in same merging pixel is added
When obtaining pixel value generation merging image, whether merging pixel of the detection positioned at the merging image corner reaches predetermined luminance；
If it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, with reference to the corner
Merge the pixel value of pixel, carrying out brightness to remaining merging pixel constrains compensation, wherein, it is described according to default compensation policy,
The oppressive compensation of brightness is carried out to remaining merging pixel with reference to the pixel value of the merging pixel of the corner, including：Obtain all sides
The minimum pixel value of the merging pixel at angle；The standard successively decreased according to the brightness of image from center to corner with radius squared inverse,
Brightness is carried out to remaining merging pixel with reference to the minimum pixel value and constrains compensation；
If it is determined that the merging pixel of the corner is not reaching to predetermined luminance, then according to default compensation policy, with reference to positioned at institute
The pixel value for the merging pixel for merging picture centre is stated, luminance raising compensation is carried out to remaining merging pixel.
7. method as claimed in claim 6, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the average pixel value of the merging pixel of all corners；
Compare the size of the average pixel value and default first threshold；
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
8. method as claimed in claim 6, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the minimum pixel value of the merging pixel of all corners；
Compare the size of the minimum pixel value and default Second Threshold；
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
9. method as claimed in claim 6, it is characterised in that merging pixel of the detection positioned at the merging image corner
Whether predetermined luminance is reached, including：
Obtain the average pixel value of the merging pixel of all corners；
Obtain the poor absolute value of the pixel value and the average pixel value of the merging pixel positioned at the merging picture centre；
Compare the size of the absolute value and default 3rd threshold value；
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to default bright
Degree；
If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
A kind of 10. brightness of image compensation device, it is characterised in that including：Imaging sensor and image processor, wherein,
Described image sensor includes：Photosensitive pixel array, and the optical filter being arranged on the photosensitive pixel array, its
In, the optical filter includes filter unit array, and each filter unit covers multiple photosensitive pixels and forms merging pixel；
Described image processor includes：
Detection module, for working as the output according to the photosensitive pixel array, it will belong to multiple photosensitive in same merging pixel
When the output addition acquisition pixel value generation of pixel merges image, whether detection is located at the merging pixel for merging image corner
Reach predetermined luminance；
Compensating module, for if it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, ginseng
The pixel value of the merging pixel of the corner is examined, carrying out brightness to remaining merging pixel constrains compensation, wherein,
The detection module is additionally operable to：The brightness case of current environment is detected, and obtains being averaged for the merging pixel of all corners
Pixel value；
The compensating module is used for：Obtain default compensation matched curve corresponding with the brightness case；According to the compensation
Matched curve carries out brightness to remaining merging pixel with reference to the average pixel value and constrains compensation；
The compensating module, it is additionally operable to if it is determined that the merging pixel of the corner is not reaching to predetermined luminance, then according to default
Compensation policy, with reference to the pixel value of the merging pixel positioned at the merging picture centre, brightness is carried out to remaining merging pixel
Lifting compensation.
11. device as claimed in claim 10, it is characterised in that the detection module is used for：
Obtain the average pixel value of the merging pixel of all corners；
Compare the size of the average pixel value and default first threshold；
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
12. device as claimed in claim 10, it is characterised in that the detection module is used for：
Obtain the minimum pixel value of the merging pixel of all corners；
Compare the size of the minimum pixel value and default Second Threshold；
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
13. device as claimed in claim 10, it is characterised in that the detection module is used for：
Obtain the average pixel value of the merging pixel of all corners；
Obtain the poor absolute value of the pixel value and the average pixel value of the merging pixel positioned at the merging picture centre；
Compare the size of the absolute value and default 3rd threshold value；
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to default bright
Degree；
If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
14. device as claimed in claim 10, it is characterised in that the detection module is used for：
Obtain the photosensitive information of current environment；
According to the photosensitive information and the brightness case of predetermined threshold value detection current environment.
A kind of 15. brightness of image compensation device, it is characterised in that including：Imaging sensor and image processor, wherein,
Described image sensor includes：Photosensitive pixel array, and the optical filter being arranged on the photosensitive pixel array, its
In, the optical filter includes filter unit array, and each filter unit covers multiple photosensitive pixels and forms merging pixel；
Described image processor includes：
Detection module, for working as the output according to the photosensitive pixel array, it will belong to multiple photosensitive in same merging pixel
When the output addition acquisition pixel value generation of pixel merges image, whether detection is located at the merging pixel for merging image corner
Reach predetermined luminance；
Compensating module, for if it is determined that the merging pixel of the corner reaches predetermined luminance, then according to default compensation policy, ginseng
The pixel value of the merging pixel of the corner is examined, carrying out brightness to remaining merging pixel constrains compensation, wherein,
The detection module is additionally operable to obtain the minimum pixel value of the merging pixel of all corners；
The compensating module is additionally operable to the standard successively decreased according to the brightness of image from center to corner with radius squared inverse, reference
The minimum pixel value carries out brightness to remaining merging pixel and constrains compensation；
The compensating module, it is additionally operable to if it is determined that the merging pixel of the corner is not reaching to predetermined luminance, then according to default
Compensation policy, with reference to the pixel value of the merging pixel positioned at the merging picture centre, brightness is carried out to remaining merging pixel
Lifting compensation.
16. device as claimed in claim 15, it is characterised in that the detection module is used for：
Obtain the average pixel value of the merging pixel of all corners；
Compare the size of the average pixel value and default first threshold；
If the average pixel value is more than or equal to the first threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the average pixel value is less than the first threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
17. device as claimed in claim 15, it is characterised in that the detection module is used for：
Obtain the minimum pixel value of the merging pixel of all corners；
Compare the size of the minimum pixel value and default Second Threshold；
If the minimum pixel value is more than or equal to the Second Threshold, it is determined that the merging pixel of the corner reaches default bright
Degree；
If the minimum pixel value is less than the Second Threshold, it is determined that the merging pixel of the corner is not reaching to default bright
Degree.
18. device as claimed in claim 15, it is characterised in that the detection module is used for：
Obtain the average pixel value of the merging pixel of all corners；
Obtain the poor absolute value of the pixel value and the average pixel value of the merging pixel positioned at the merging picture centre；
Compare the size of the absolute value and default 3rd threshold value；
If the absolute value is more than or equal to the 3rd threshold value, it is determined that the merging pixel of the corner is not reaching to default bright
Degree；
If the absolute value is less than the 3rd threshold value, it is determined that the merging pixel of the corner reaches predetermined luminance.
A kind of 19. terminal device, it is characterised in that including：Brightness of image compensation dress as described in claim 10-14 is any
Put, or, the brightness of image compensation device as described in claim 15-18 is any.
20. equipment as claimed in claim 19, it is characterised in that the terminal device includes：
Mobile phone, IPAD or, Intelligent worn device.
21. equipment as claimed in claim 19, it is characterised in that also include：It is connected with described image luminance compensating mechanism
Central processing unit and external memory, the central processing unit are used to control the external memory storage image.
22. equipment as claimed in claim 19, it is characterised in that also include：It is connected with described image luminance compensating mechanism
Central processing unit and display device, the central processing unit are used to control the display device display image.
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| CN107295268A (en) * | 2016-07-29 | 2017-10-24 | 广东欧珀移动通信有限公司 | The dark angle compensation method of image, device and terminal device |
| CN106341617B (en) * | 2016-11-16 | 2019-08-02 | 信利光电股份有限公司 | A kind of method and device of camera crosstalk compensation |
| CN106341670B (en) * | 2016-11-29 | 2017-09-22 | 广东欧珀移动通信有限公司 | Control method, control device and electronic installation |
| CN106454054B (en) | 2016-11-29 | 2019-03-19 | Oppo广东移动通信有限公司 | Control method, control device and electronic device |
| CN106504218B (en) | 2016-11-29 | 2019-03-12 | Oppo广东移动通信有限公司 | Control method, control device and electronic device |
| CN106412407B (en) | 2016-11-29 | 2019-06-07 | Oppo广东移动通信有限公司 | Control method, control device and electronic device |
| CN107231525A (en) * | 2017-05-31 | 2017-10-03 | 深圳可思美科技有限公司 | The dark angle self-adapting compensation method of image and device |
| US11250813B2 (en) * | 2018-04-04 | 2022-02-15 | Huawei Technologies Co., Ltd. | Ambient light detection method and terminal |
| CN108401120B (en) * | 2018-04-28 | 2020-11-10 | 歌尔科技有限公司 | Photographing method and device and wearable smart watch |
| CN109005346B (en) | 2018-08-13 | 2020-04-03 | Oppo广东移动通信有限公司 | Control method, control device, electronic equipment and computer-readable storage medium |
| CN112422837B (en) * | 2019-08-20 | 2022-07-05 | 深圳市芯睿视科技有限公司 | Method, device, equipment and storage medium for synthesizing high dynamic range image |
| CN114140336B (en) * | 2021-10-08 | 2022-09-16 | 中国安全生产科学研究院 | Infrared image-based dead pixel processing method and device |
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| CN101340532A (en) * | 2007-07-02 | 2009-01-07 | 深圳创维－Rgb电子有限公司 | Brightness automatic compensating method of television image dark field |
| JP2013021660A (en) * | 2011-07-14 | 2013-01-31 | Sony Corp | Image processing apparatus, image pickup apparatus, image processing method, and program |
| CN103531175B (en) * | 2013-10-31 | 2016-08-17 | 广东威创视讯科技股份有限公司 | Splicing display device screen intensity uniformity tuning method and system |
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