CN105592270A - Image brightness compensation method and device, and terminal device - Google Patents
Image brightness compensation method and device, and terminal device Download PDFInfo
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Abstract
The invention provides an image brightness compensation method and device, and a terminal device. An image sensor provided in advance comprises a light-sensing pixel array and a light filter disposed on the light-sensing pixel array. The light filter comprises a light-filtering unit array. Each light-filtering unit covers multiple light-sensing pixels and forms a combined pixel. The method comprises steps of: detecting whether combined pixels at corners reach preset brightness when a combined image is generated by adding the outputs of multiple light-sensing pixels belonging to one combined pixel to acquire a pixel value; if yes, performing depressed compensation on the brightness of other combined pixels according to a preset compensation strategy and with reference to the pixel values of the combined pixels at the corners. The method and device achieve brightness depressed compensation on the pixels from a center to the corners so that the brightness of an entire image is uniform and the noise of the entire image is controlled to a certain extent. Thus, image quality is increased and burden of later image de-nosing is decreased.
Description
Technical field
The present invention relates to technical field of image processing, relate in particular to a kind of image brightness compensation method, device and terminal device.
Background technology
Due to camera lens and eyeglass all smaller, light-inletting quantity is restricted. Meanwhile, brightness of image presents successively decreasing of concentric-ring pattern, forEnsure the uniformity of brightness of image, need to strengthen compensation to corner pixel brightness, avoid the generation at dark angle. ButWhen dark side angle is compensated, also strengthen noise simultaneously, the image denoising processing in later stage has been brought to considerable influence.
Summary of the invention
The present invention is intended to solve at least to a certain extent one of technical problem in correlation technique.
For this reason, first object of the present invention is to propose a kind of image brightness compensation method, and the method has realized corner is arrivedThe pixel at center carries out brightness and constrains compensation, thereby makes the brightness of entire image even, and noise has also obtained certain pressureSystem, improves picture quality, has alleviated burden to the image denoising in later stage.
Second object of the present invention is to propose a kind of brightness of image compensation arrangement.
The 3rd object of the present invention is to propose a kind of terminal device.
For reaching above-mentioned purpose, first aspect present invention embodiment has proposed a kind of image brightness compensation method, comprising: carry in advanceThe imageing sensor of confession comprises: photosensitive pixel array, and be arranged on the optical filter on described photosensitive pixel array, wherein,Described optical filter comprises filter unit array, and each filter unit covers multiple photosensitive pixels and forms and merges pixel; Described sideMethod comprises the following steps:
When according to the output of described photosensitive pixel array, the output that belongs to the multiple photosensitive pixels in same merging pixel is addedObtain pixel value and generate while merging image, whether the merging pixel that detection is positioned at described merging image corner reaches default brightness;If determine, the merging pixel of described corner reaches default brightness, according to default compensation policy, with reference to the merging of described cornerThe pixel value of pixel, merges pixel to all the other and carries out the oppressive compensation of brightness.
The image brightness compensation method of the embodiment of the present invention, when according to the output of described photosensitive pixel array, will belong to same closingAnd the output of multiple photosensitive pixels in pixel is added and obtains pixel value and generate while merging image, detect and be positioned at described merging imageWhether the merging pixel of corner reaches default brightness; If determine, the merging pixel of described corner reaches default brightness, according to pre-If compensation policy, with reference to the pixel value of the merging pixel of described corner, all the other are merged to pixels and carry out brightness and constrain compensation.Thus, realize the oppressive compensation of brightness carried out to the pixel at center in corner, thereby made the brightness of entire image even,Noise has also obtained certain compacting, improves picture quality, has alleviated burden to the image denoising in later stage.
For reaching above-mentioned purpose, second aspect present invention embodiment has proposed a kind of brightness of image compensation arrangement, comprising: image passesSensor and image processor, wherein,
Described imageing sensor comprises: photosensitive pixel array, and be arranged on the optical filter on described photosensitive pixel array, itsIn, described optical filter comprises filter unit array, each filter unit covers multiple photosensitive pixels and forms and merges pixel;
Described image processor comprises: detection module, for when according to the output of described photosensitive pixel array, will belong to sameThe output that merges the multiple photosensitive pixels in pixel is added while obtaining pixel value generation merging image, detects and is positioned at described merging figureWhether the merging pixel as corner reaches default brightness; Compensating module, if reach pre-for the merging pixel of determining described cornerIf brightness, according to default compensation policy, the pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and entersCompensation is constrained in row brightness.
The brightness of image compensation arrangement of the embodiment of the present invention, when according to the output of described photosensitive pixel array, will belong to same closingAnd the output of multiple photosensitive pixels in pixel is added and obtains pixel value and generate while merging image, detect and be positioned at described merging imageWhether the merging pixel of corner reaches default brightness; If determine, the merging pixel of described corner reaches default brightness, according to pre-If compensation policy, with reference to the pixel value of the merging pixel of described corner, all the other are merged to pixels and carry out brightness and constrain compensation.Thus, realize the oppressive compensation of brightness carried out to the pixel at center in corner, thereby made the brightness of entire image even,Noise has also obtained certain compacting, improves picture quality, has alleviated burden to the image denoising in later stage.
For reaching above-mentioned purpose, third aspect present invention embodiment has proposed a kind of terminal device, comprises that image as above is brightDegree compensation arrangement.
The terminal device of the embodiment of the present invention, when according to the output of described photosensitive pixel array, will belong in same merging pixelThe output of multiple photosensitive pixels be added and obtain pixel value and generate and merge when image, detect and be positioned at closing of described merging image cornerAnd whether pixel reaches default brightness; If determine, the merging pixel of described corner reaches default brightness, according to default compensationStrategy, the pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness. Thus, realShowed the oppressive compensation of brightness is carried out to the pixel at center in corner, thereby made the brightness of entire image even, noise also obtainsArrive certain compacting, improved picture quality, alleviated burden to the image denoising in later stage.
Brief description of the drawings
The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviousWith easy understanding, wherein:
Fig. 1 is the perspective view of the imageing sensor that provides of the 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 imageing 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 arrangement 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.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein identical from start to finishOr similarly label represents same or similar element or has the element of identical or similar functions. Below by retouching with reference to accompanying drawingThe embodiment stating is exemplary, is intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
Image brightness compensation method, device and the terminal device of the embodiment of the present invention are described below with reference to accompanying drawing.
The dead pixel compensation method of the imageing sensor that particularly, the present embodiment provides is configured in the terminal with imageing sensorIn equipment, be specifically described. The type that it should be noted that terminal device is a lot, for example: mobile phone, IPAD, intelligence are wornWear equipment etc.
Fig. 1 is the perspective view of the imageing sensor that provides of the embodiment of the present invention.
Imageing sensor 1 is as shown in Figure 1 set in advance in terminal device, and wherein, imageing sensor 1 can be CCDOr cmos sensor.
Referring to Fig. 1, imageing sensor 1 comprises: photosensitive pixel array 11, and be arranged on described photosensitive pixel array 11Optical filter, wherein, described optical filter comprises filter unit array 12, each filter unit 121 covers multiple photosensitive pixels111 also form merging pixel.
Because the real-time luminosity of environment is a key factor that affects imageing sensor image quality, when the brightness of photo environmentWhen too low, there is too much image noise in the image of generation, makes not fogging clear.
In order to address the above problem, the imageing sensor 1 providing based on Fig. 1 in the present embodiment, can according to environment in real timeLight situation, determines whether according to the output of photosensitive pixel array 11, by the multiple photosensitive pixels 111 in same merging pixelOutput be added and obtain pixel value, the image of output and real-time bright situation respective pixel.
Therefore, the imageing sensor providing based on above-mentioned Fig. 1 and different image formation modes, implement provided by the inventionImage brightness compensation method. Specific as follows:
Fig. 2 is the flow chart of the image brightness compensation method of one embodiment of the invention.
As shown in Figure 2, this image brightness compensation method comprises the following steps:
Step 101, when according to the output of described photosensitive pixel array, by the multiple photosensitive pixels that belong in same merging pixelOutput be added and obtain pixel value and generate and merge when image, detect the merging pixel that is positioned at described merging image corner and whether reachDefault brightness.
Particularly, referring to Fig. 1, when each photosensitive pixel 111 in photosensitive pixel array 11 is known in imageing sensor in detectionLight-inletting quantity hour, illustrate that the sensitization degree of current environment is poor, and image noise is more, causes the image exported very unclearChu. Therefore, need to, according to the output of each photosensitive pixel 111 in photosensitive pixel array 11, will belong in same merging pixelThe output of multiple photosensitive pixels be added and obtain pixel value, to improve light-inletting quantity, make up single photosensitive pixel light-inletting quantity notThe defect of foot, and then generate merging image, thus improve the definition of output image.
In order more clearly to describe, the output that belongs to the multiple photosensitive pixels in same merging pixel to be added and to obtain pixel value lifeThe process that becomes to merge image, is described as follows in conjunction with Fig. 3-Fig. 4:
Fig. 3 is the filter unit array schematic diagram in imageing sensor provided by the invention.
Fig. 4 is merging pel array schematic diagram provided by the invention.
Referring to Fig. 1 and Fig. 3, cover 2*2 photosensitive pixel 111 taking each filter unit 121 and describe as example:
The output of each and every one photosensitive pixel of 2*2 that each filter unit 121 is covered is added, in other words, and by adjacent respectivelyAn include monochrome pixels is merged in the output of the photosensitive pixel that color is identical. Due to the fine difference of illumination, each photosensitive pixel 111Corresponding output also may be different, and the pixel value that therefore merges pixel combines the output of its 2*2 photosensitive pixel 111.It is original 1/4 that the pixel of merging image generating is just reduced to, referring to Fig. 4.
For example: if the photosensitive pixel array of imageing sensor 1 11 is 16M, a 2*2 that each filter unit 121 coversPhotosensitive pixel 111 the merging pixel forming, be added read pixel by the output of 4 photosensitive pixels in each merging pixelValue, the pixel of the merging image of generation is just reduced to 4M.
As mentioned above, when according to the output of described photosensitive pixel array, by the multiple photosensitive pixels that belong in same merging pixelOutput be added and obtain pixel value and generate and merge when image, the light quantity that imageing sensor obtains increases greatly, speed is carried greatlyHigh. For example:
Continue referring to shown in Fig. 3 and Fig. 4, the image of generation becomes 4M from 16M, is equivalent to each picture in imageing sensorVegetarian refreshments has increased by 4 times, and the speed of imageing sensor improves greatly, therefore light-inletting quantity become concentric-ring pattern successively decrease degree reduce.In other words be exactly, that the brightness of output image corner and the luminance difference at center greatly reduce.
Now, whether the merging pixel that needs detection to be positioned at merging image corner reaches default brightness, to determine the brightness of cornerCan reach the requirement of vision.
It should be noted that and can adopt different detection modes according to different application scenarios, detect and be positioned at merging image limitWhether the merging pixel at angle reaches default brightness, and the present embodiment does not limit this. Illustrate as follows:
The first example: the average pixel value of the merging pixel by all corners detects corner brightness, specifically comprises:
Obtain the average pixel value of the merging pixel of all corners, and more described average pixel value and default first thresholdSize.
If described average pixel value is more than or equal to described first threshold, determine that the merging pixel of described corner reaches default brightDegree; If described average pixel value is less than described first threshold, determine that the merging pixel of described corner does not reach default brightDegree.
The second example: the minimum pixel value of the merging pixel by all corners detects corner brightness, specifically comprises:
Obtain the minimum pixel value of the merging pixel of all corners, and more described minimum pixel value and default Second ThresholdSize.
If described minimum pixel value is more than or equal to described Second Threshold, determine that the merging pixel of described corner reaches default brightDegree; If described minimum pixel value is less than described Second Threshold, determine that the merging pixel of described corner does not reach default brightDegree.
The third example: the difference of the pixel value by the merging pixel of corner and the merging pixel at center detects corner brightness,Specifically comprise:
First, obtain the average pixel value of the merging pixel of all corners.
Then, obtain be positioned at the pixel value of merging pixel of described merging picture centre and the difference of described average pixel value definitelyValue, and the size of more described absolute value and default the 3rd threshold value.
If described absolute value is more than or equal to described the 3rd threshold value, determine that the merging pixel of described corner does not reach default brightDegree; If described absolute value is less than described the 3rd threshold value, determine that the merging pixel of described corner reaches default brightness.
Step 102, if determine, the merging pixel of described corner reaches default brightness, according to default compensation policy, referenceThe pixel value of the merging pixel of described corner, merges pixel to all the other and carries out the oppressive compensation of brightness.
Particularly, if determine, the merging pixel of described corner reaches default brightness, illustrates due to by multiple in same merging pixelThe output of photosensitive pixel is added, and causes the increase of light-inletting quantity, and the brightness that merges pixel promotes greatly, makes the brightness energy of cornerEnough reach the requirement of vision.
Thus, in the time that brightness of image is compensated, be no longer reference brightness taking center, corner is done and promoted compensation, like thisCan bring larger noise, affect picture quality. The luminance compensation method providing of the present embodiment is according to default compensation planSlightly, the pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness.
It should be noted that and can or adjust compensation policy according to concrete application scenarios setting, with reference to the merging picture of cornerThe pixel value of element, merges pixel by different modes and standard to all the other and carries out the oppressive compensation of brightness. For example:
Can be in advance according to the order of distance and image compensation between the merging pixel at merging pixel Yu center to be compensatedMark brightness arranges corresponding Mathematical Modeling. And then, according to this data model, with reference to the pixel value of the merging pixel of corner, rightAll the other merge pixel and carry out the oppressive compensation of brightness.
Or,
The object brightness of image can be set according to different brightness situations in advance, the object brightness of image comprise center brightness,Luminance difference amplitude in certain distance, thus matched curve generated. And then according to this matched curve, with reference to the merging of cornerThe pixel value of pixel, merges pixel to all the other and carries out the oppressive compensation of brightness.
The concrete manifestation form that it is emphasized that the pixel value of the merging pixel of the corner of institute's reference in above-mentioned compensation process hasA lot, can arrange and adjust according to concrete application scenarios, the present embodiment be restricted this. For example:
Can be with reference to the average pixel value of the merging pixel of all corners, or,
Can be with reference to the minimum pixel value of the merging pixel of all corners.
The image brightness compensation method that the present embodiment provides, when according to the output of described photosensitive pixel array, will belong to same closingAnd the output of multiple photosensitive pixels in pixel is added and obtains pixel value and generate while merging image, detect and be positioned at described merging imageWhether the merging pixel of corner reaches default brightness, if determine, corner reaches default brightness, according to default compensation policy,The pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness. Thus, realized rightCorner is carried out brightness to the pixel at center and is constrained compensation, thereby makes the brightness of entire image even, and noise has also obtained oneFixed compacting, improves picture quality, has alleviated burden to the image denoising in later stage.
Based on above-described embodiment, for step 102, can or adjust compensation policy according to concrete application scenarios setting,With reference to the pixel value of the merging pixel of corner, by different modes and standard, all the other are merged to pixels and carry out brightness and constrain compensation,Illustrate 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, for above-mentioned steps 102, this image brightness compensation method comprises the following steps:
Step 201, the brightness situation of detection current environment.
Step 202, obtains the default compensation matched curve corresponding with described brightness situation.
Step 203, obtains the average pixel value of the merging pixel of all corners.
Step 204, carries out brightness with reference to described average pixel value to all the other merging pixels according to described compensation matched curve and constrainsCompensation.
Particularly, according to the brightness situation of detected current environment, obtain the default compensation matching corresponding with brightness situationCurve. Wherein, can detect in several ways bright situation, for example:
Can obtain the sensitization information of environment, detect the bright situation of photo environment according to sensitization information and whether reach default brightDegree.
Wherein, the particular content of sensitization information is a lot, for example: sensitivity value is ISO value, or, the automatic exposure of camera lensValue (AutomaticExposure, AE). Therefore, can need to obtain the ring of taking pictures by different photo-sensitive cells according to applicationThe sensitization information in border, the present embodiment is not restricted this.
Then, obtain the average pixel value of the merging pixel of all corners, and then according to the compensation corresponding with real-time bright situationMatched curve merges pixel with reference to described average pixel value to all the other and carries out the oppressive compensation of brightness. For example: according to compensation matching songThe pixel value that the amplitude of line merges pixel to center adds the first negative value, and the pixel value of the merging pixel at the center 1/2 of adjusting the distance addsUpper the second negative value, wherein, the second negative value is less than the first negative value, carries out the oppressive benefit of brightness thereby successively remaining is merged to pixelRepay.
The image brightness compensation method that the present embodiment provides, by detecting the brightness situation of current environment, obtains default and instituteState compensation matched curve corresponding to brightness situation, according to described compensation matched curve with reference to the average pixel value of all corners to itThe remaining pixel that merges is carried out the oppressive compensation of brightness. Thus, realize the oppressive compensation of brightness carried out to the pixel at center in corner,Thereby make the brightness of entire image even, noise has also obtained certain compacting, improve picture quality, give the image in later stageDenoising has alleviated burden.
Fig. 6 is the flow chart of the image brightness compensation method of another embodiment of the present invention.
As shown in Figure 6, for above-mentioned steps 102, this image brightness compensation method comprises the following steps:
Step 301, obtains the minimum pixel value of the merging pixel of all corners.
Step 302, according to therefrom four jiaos of standards of successively decreasing with radius squared inverse of mind-set of the brightness of image, with reference to described minimumPixel value merges pixel to remaining and carries out the oppressive compensation of brightness.
Particularly, obtain the minimum pixel value of the merging pixel of all corners, and then according to therefrom four jiaos of mind-sets of the brightness of imageThe standard of successively decreasing with radius squared inverse, merges pixel with reference to described minimum pixel value to remaining and carries out the oppressive compensation of brightness.For example: the pixel value that center is merged to pixel according to the amplitude of compensation matched curve adds the 3rd negative value, the center 3/5 of adjusting the distanceThe pixel value of merging pixel add the 4th negative value, wherein, the 4th negative value is less than the 3rd negative value, thereby successively remaining is closedAnd pixel carries out brightness and constrain compensation, make the brightness of the image after brightness is constrained meet therefrom four jiaos of mind-sets and fall with radius squaredThe standard that number successively decreases.
The image brightness compensation method that the present embodiment provides, by according to the brightness of image therefrom four jiaos of mind-sets fall with radius squaredThe standard that number successively decreases, the minimum pixel value of the merging pixel of all corners of reference merges pixel to remaining and carries out the oppressive benefit of brightnessRepay. Thus, realized the oppressive compensation of brightness has been carried out to the pixel at center in corner, thereby made the brightness of entire image equalEven, noise has also obtained certain compacting, improves picture quality, has alleviated burden to the image denoising in later stage.
Based on above-described embodiment, further, also comprise:
If determine, the merging pixel of described corner does not reach default brightness, although illustrate multiple sensitization in same merging pixelThe output of pixel is added, but because the pixel quantity of bright situation at that time or merging is very few, causes light-inletting quantity still notFoot, makes the brightness of corner can't reach the requirement of vision.
Thus, according to default compensation policy, reference is positioned at the pixel value of the merging pixel of described merging picture centre, to itRemaining merging pixel is carried out luminance raising compensation.
In order to realize above-described embodiment, the present invention also proposes a kind of brightness of image compensation arrangement.
Fig. 7 is the structural representation of the brightness of image compensation arrangement of one embodiment of the invention.
As shown in Figure 7, this brightness of image compensation arrangement comprises:
Imageing sensor 1 and image processor 2, wherein,
The structure of described imageing sensor 1, referring to Fig. 1, specifically comprises: photosensitive pixel array 11, and be arranged on described senseOptical filter on light pixel array 11, wherein, described optical filter comprises filter unit array 12, each filter unit 121Cover multiple photosensitive pixels 111 and form and merge pixel;
Described image processor 2 comprises: detection module 21 and compensating module 22, wherein,
Detection module 21, for working as according to the output of described photosensitive pixel array, by the multiple senses that belong in same merging pixelThe output of light pixel is added while obtaining pixel value generation merging image, and the merging pixel that detection is positioned at described merging image corner isNoly reach default brightness;
Particularly, in one embodiment, described detection module 21 for:
Obtain the average pixel value of the merging pixel of all corners;
The size of more described average pixel value and default first threshold;
If described average pixel value is more than or equal to described first threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described average pixel value is less than described first threshold, determine that the merging pixel of described corner does not reach default brightDegree.
In another embodiment, described detection module 21 for:
Obtain the minimum pixel value of the merging pixel of all corners;
The size of more described minimum pixel value and default Second Threshold;
If described minimum pixel value is more than or equal to described Second Threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described minimum pixel value is less than described Second Threshold, determine that the merging pixel of described corner does not reach default brightDegree.
In another embodiment, described detection module 21 for:
Obtain the average pixel value of the merging pixel of all corners;
Obtain and be positioned at the pixel value of merging pixel of described merging picture centre and the absolute value of the difference of described average pixel value;
The size of more described absolute value and default the 3rd threshold value;
If described absolute value is more than or equal to described the 3rd threshold value, determine that the merging pixel of described corner does not reach default brightDegree;
If described absolute value is less than described the 3rd threshold value, determine that the merging pixel of described corner reaches default brightness.
Compensating module 22, if reach default brightness for the merging pixel of determining described corner, according to default compensation policy,The pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness.
Particularly, in one embodiment, described compensating module 22 for:
According to therefrom four jiaos of standards of successively decreasing with radius squared inverse of mind-set of the brightness of image, with reference to the merging pixel of described cornerPixel value to remaining merge pixel carry out brightness constrain compensation.
Particularly, in another embodiment,
Described detection module 21 also for: detect the brightness situation of current environment;
Wherein, described detection module 21 for:
Obtain the sensitization information of current environment;
According to the brightness situation of described sensitization information and predetermined threshold value detection current environment.
Described compensating module 22 for: described compensating module is used for: intend according to the default compensation corresponding with described brightness situationClose curve, the pixel value of the merging pixel of the described corner of reference merges pixels to all the other and carries out the oppressive compensation of brightness.
Based on above-described embodiment, the pixel value of the merging pixel of the described corner of described reference, comprising:
The average pixel value of the merging pixel of all corners of reference, or,
The minimum pixel value of the merging pixel of all corners of reference.
It should be noted that the aforementioned image that explaining of image brightness compensation method embodiment is also applicable to this embodimentLuminance compensating mechanism repeats no more herein.
The brightness of image compensation arrangement of the embodiment of the present invention, when according to the output of described photosensitive pixel array, will belong to same closingAnd the output of multiple photosensitive pixels in pixel is added and obtains pixel value and generate while merging image, detect and be positioned at described merging imageWhether the merging pixel of corner reaches default brightness; If determine, the merging pixel of described corner reaches default brightness, according to pre-If compensation policy, with reference to the pixel value of the merging pixel of described corner, all the other are merged to pixels and carry out brightness and constrain compensation.Thus, realize the oppressive compensation of brightness carried out to the pixel at center in corner, thereby made the brightness of entire image even,Noise has also obtained certain compacting, improves picture quality, has alleviated burden to the image denoising in later stage.
Based on above-described embodiment, in another embodiment, described compensating module 22 also for:
If determine, the merging pixel of described corner does not reach default brightness, according to default compensation policy, with reference to being positioned at instituteState the pixel value of the merging pixel that merges picture centre, remaining is merged to pixel and carry out luminance raising compensation.
In order to realize above-described embodiment, the present invention also proposes a kind of terminal device. This terminal device comprises: as above embodiment carriesBrightness of image compensation arrangement.
Wherein, described terminal equipment type is a lot, for example, comprise: mobile phone, IPAD or, intelligent wearing equipment.
It should be noted that the aforementioned terminal that explaining of image brightness compensation method embodiment is also applicable to this embodimentEquipment repeats no more herein.
The terminal device of the embodiment of the present invention, when according to the output of described photosensitive pixel array, will belong in same merging pixelThe output of multiple photosensitive pixels be added and obtain pixel value and generate and merge when image, detect and be positioned at closing of described merging image cornerAnd whether pixel reaches default brightness; If determine, the merging pixel of described corner reaches default brightness, according to default compensationStrategy, the pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness. Thus, realShowed the oppressive compensation of brightness is carried out to the pixel at center in corner, thereby made the brightness of entire image even, noise also obtainsArrive certain compacting, improved picture quality, alleviated burden to the image denoising in later stage.
Fig. 8 is the structural representation of the terminal device of one embodiment of the invention, and as shown in Figure 8, this terminal device comprises:Brightness of image compensation arrangement 10, the central processing unit 20 and the external memory 30 that are connected with described brightness of image compensation arrangement 10,Described central processing unit 20 is for controlling described external memory 30 memory images.
It should be noted that the aforementioned terminal that explaining of image brightness compensation method embodiment is also applicable to this embodimentEquipment, it is similar that it realizes principle, repeats no more herein.
Fig. 9 is the structural representation of the terminal device of another embodiment of the present invention, and as shown in Figure 9, this terminal device comprises:Brightness of image compensation arrangement 10, the central processing unit 20 and the display unit 40 that are connected with described brightness of image compensation arrangement 10,Described central processing unit 20 shows image for controlling described display unit 40.
It should be noted that the aforementioned terminal that explaining of image brightness compensation method embodiment is also applicable to this embodimentEquipment, it is similar that it realizes principle, repeats no more herein.
In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " specifically showExample " or the description of " some examples " etc. the specific features that means to describe in conjunction with this embodiment or example, structure, material orFeature is contained at least one embodiment of the present invention or example. In this manual, the schematic statement to above-mentioned termNot must for be identical embodiment or example. And specific features, structure, material or the feature of description canIn one or more embodiment in office or example with suitable mode combination. In addition, not conflicting in the situation that, abilityThe technical staff in territory can enter the feature of the different embodiment that describe in this description or example and different embodiment or exampleRow combination and combination.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importanceOr the implicit quantity that indicates indicated technical characterictic. Thus, the feature that is limited with " first ", " second " can be expressedOr impliedly comprise at least one this feature. In description of the invention, the implication of " multiple " is at least two, for example twoIndividual, three etc., unless otherwise expressly limited specifically.
Any process of otherwise describing in flow chart or at this or method are described and can be understood to, represent to comprise oneOr more for realizing module, fragment or the part of code of executable instruction of step of specific logical function or process,And the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to shown or discuss order,Comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be by of the present inventionEmbodiment person of ordinary skill in the field understands.
The logic and/or the step that in flow chart, represent or otherwise describe at this, for example, can be considered to for realityThe sequencing list of the executable instruction of existing logic function, may be embodied in any computer-readable medium, for instructionExecutive system, device or equipment (as computer based system, comprise that the system of processor or other can carry out from instructionSystem, device or equipment instruction fetch are also carried out the system of instruction) use, or in conjunction with these instruction execution systems, install or establishStandby and use. With regard to this description, " computer-readable medium " can be anyly can comprise, store, communicate by letter, propagateOr transmission procedure uses for instruction execution system, device or equipment or in conjunction with these instruction execution systems, device or equipmentDevice. The example more specifically (non-exhaustive list) of computer-readable medium comprises following: have one or more clothThe electrical connection section (electronic installation) of line, portable computer diskette box (magnetic device), random access memory (RAM), read-onlyMemory (ROM), the erasable read-only storage (EPROM or flash memory) of editing, fiber device, and portableCompact disc read-only memory (CDROM). In addition, computer-readable medium can be even the paper that can print described program thereonOr other suitable media, because can, for example by paper or other media are carried out to optical scanner, then edit, separateTranslate or process in electronics mode and obtain described program with other suitable methods if desired, be then stored in computerIn memory.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination. In above-mentioned realityExecute in mode, multiple steps or method can be with the software being stored in memory and carried out by suitable instruction execution system orFirmware is realized. For example, if realized with hardware, with the same in another embodiment, available well known in the art underAny one in row technology or their combination realize: have the logic gates for data-signal being realized to logic functionDiscrete logic, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), existingField programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is canComplete to carry out the hardware that instruction is relevant by program, described program can be stored in a kind of computer-readable recording medium,This program, in the time carrying out, comprises step of embodiment of the method one or a combination set of.
In addition, the each functional unit in each embodiment of the present invention can be integrated in a proxy module, can be also eachThe independent physics in individual unit exists, and also can be integrated in a module two or more unit. Above-mentioned integrated module bothCan adopt the form of hardware to realize, also can adopt the form of software function module to realize. If described integrated module withThe form of software function module realizes and as production marketing independently or while using, also can be stored in a computer-readableGet in storage medium.
The above-mentioned storage medium of mentioning can be read-only storage, disk or CD etc. Although illustrated above and describedEmbodiments of the invention, are understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention,Those of ordinary skill in the art can change above-described embodiment within the scope of the invention, amendment, replacement and modification.
Claims (22)
1. an image brightness compensation method, is characterized in that, the imageing sensor providing in advance comprises: photosensitive pixel array,And be arranged on the optical filter on described photosensitive pixel array, wherein, described optical filter comprises filter unit array, each filterLight unit covers multiple photosensitive pixels and forms and merges pixel; Said method comprising the steps of:
When according to the output of described photosensitive pixel array, the output that belongs to the multiple photosensitive pixels in same merging pixel is addedObtain pixel value and generate while merging image, whether the merging pixel that detection is positioned at described merging image corner reaches default brightness;
If determine, the merging pixel of described corner reaches default brightness, according to default compensation policy, the described corner of referenceMerge the pixel value of pixel, all the other are merged to pixel and carry out the oppressive compensation of brightness.
2. the method for claim 1, is characterized in that, described detection is positioned at the merging picture of described merging image cornerWhether element reaches default brightness, comprising:
Obtain the average pixel value of the merging pixel of all corners;
The size of more described average pixel value and default first threshold;
If described average pixel value is more than or equal to described first threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described average pixel value is less than described first threshold, determine that the merging pixel of described corner does not reach default brightDegree.
3. the method for claim 1, is characterized in that, described detection is positioned at the merging picture of described merging image cornerWhether element reaches default brightness, comprising:
Obtain the minimum pixel value of the merging pixel of all corners;
The size of more described minimum pixel value and default Second Threshold;
If described minimum pixel value is more than or equal to described Second Threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described minimum pixel value is less than described Second Threshold, determine that the merging pixel of described corner does not reach default brightDegree.
4. the method for claim 1, is characterized in that, described detection is positioned at the merging picture of described merging image cornerWhether element reaches default brightness, comprising:
Obtain the average pixel value of the merging pixel of all corners;
Obtain and be positioned at the pixel value of merging pixel of described merging picture centre and the absolute value of the difference of described average pixel value;
The size of more described absolute value and default the 3rd threshold value;
If described absolute value is more than or equal to described the 3rd threshold value, determine that the merging pixel of described corner does not reach default brightDegree;
If described absolute value is less than described the 3rd threshold value, determine that the merging pixel of described corner reaches default brightness.
5. the method for claim 1, is characterized in that, the compensation policy that described basis is default, with reference to described cornerMerging pixel pixel value to all the other merge pixels carry out brightness constrain compensation, comprising:
According to therefrom four jiaos of standards of successively decreasing with radius squared inverse of mind-set of the brightness of image, with reference to the merging pixel of described cornerPixel value to remaining merge pixel carry out brightness constrain compensation.
6. the method for claim 1, is characterized in that, the compensation policy that described basis is default, with reference to described cornerMerging pixel pixel value to all the other merge pixels carry out brightness constrain compensation, comprising:
Detect the brightness situation of current environment;
According to the default compensation matched curve corresponding with described brightness situation, the pixel value of the merging pixel of the described corner of referenceAll the other are merged to pixel and carry out the oppressive compensation of brightness.
7. method as claimed in claim 6, is characterized in that, the brightness situation of described detection current environment, comprising:
Obtain the sensitization information of current environment;
According to the brightness situation of described sensitization information and predetermined threshold value detection current environment.
8. the method as described in as arbitrary in claim 1-7, is characterized in that the picture of the merging pixel of the described corner of described referenceElement value, comprising:
The average pixel value of the merging pixel of all corners of reference, or,
The minimum pixel value of the merging pixel of all corners of reference.
9. the method as described in as arbitrary in claim 1-7, is characterized in that, also comprises:
If determine, the merging pixel of described corner does not reach default brightness, according to default compensation policy, with reference to being positioned at instituteState the pixel value of the merging pixel that merges picture centre, remaining is merged to pixel and carry out luminance raising compensation.
10. a brightness of image compensation arrangement, is characterized in that, comprising: imageing sensor and image processor, wherein,
Described imageing sensor comprises: photosensitive pixel array, and be arranged on the optical filter on described photosensitive pixel array, itsIn, described optical filter comprises filter unit array, each filter unit covers multiple photosensitive pixels and forms and merges pixel;
Described image processor comprises:
Detection module, for working as according to the output of described photosensitive pixel array, by the multiple sensitization that belong in same merging pixelThe output of pixel is added obtains pixel value and generates while merging image, detect be positioned at described merging image corner merging pixel whetherReach default brightness;
Compensating module, if reach default brightness for the merging pixel of determining described corner, according to default compensation policy,The pixel value of the merging pixel of the described corner of reference, merges pixels to all the other and carries out the oppressive compensation of brightness.
11. devices as claimed in claim 10, is characterized in that, described detection module is used for:
Obtain the average pixel value of the merging pixel of all corners;
The size of more described average pixel value and default first threshold;
If described average pixel value is more than or equal to described first threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described average pixel value is less than described first threshold, determine that the merging pixel of described corner does not reach default brightDegree.
12. devices as claimed in claim 10, is characterized in that, described detection module is used for:
Obtain the minimum pixel value of the merging pixel of all corners;
The size of more described minimum pixel value and default Second Threshold;
If described minimum pixel value is more than or equal to described Second Threshold, determine that the merging pixel of described corner reaches default brightDegree;
If described minimum pixel value is less than described Second Threshold, determine that the merging pixel of described corner does not reach default brightDegree.
13. devices as claimed in claim 10, is characterized in that, described detection module is used for:
Obtain the average pixel value of the merging pixel of all corners;
Obtain and be positioned at the pixel value of merging pixel of described merging picture centre and the absolute value of the difference of described average pixel value;
The size of more described absolute value and default the 3rd threshold value;
If described absolute value is more than or equal to described the 3rd threshold value, determine that the merging pixel of described corner does not reach default brightDegree;
If described absolute value is less than described the 3rd threshold value, determine that the merging pixel of described corner reaches default brightness.
14. devices as claimed in claim 10, is characterized in that, described compensating module is used for:
According to therefrom four jiaos of standards of successively decreasing with radius squared inverse of mind-set of the brightness of image, with reference to the merging pixel of described cornerPixel value to remaining merge pixel carry out brightness constrain compensation.
15. devices as claimed in claim 10, is characterized in that, described detection module also for:
Detect the brightness situation of current environment;
Described compensating module is used for: according to the default compensation matched curve corresponding with described brightness situation, with reference to described cornerMerging pixel pixel value to all the other merge pixels carry out brightness constrain compensation.
16. devices as claimed in claim 15, is characterized in that, described detection module is used for:
Obtain the sensitization information of current environment;
According to the brightness situation of described sensitization information and predetermined threshold value detection current environment.
17. devices as described in as arbitrary in claim 10-16, is characterized in that the merging pixel of the described corner of described referencePixel value, comprising:
The average pixel value of the merging pixel of all corners of reference, or,
The minimum pixel value of the merging pixel of all corners of reference.
18. devices as described in as arbitrary in claim 10-16, is characterized in that, described compensating module also for:
If determine, the merging pixel of described corner does not reach default brightness, according to default compensation policy, with reference to being positioned at instituteState the pixel value of the merging pixel that merges picture centre, remaining is merged to pixel and carry out luminance raising compensation.
19. 1 kinds of terminal devices, is characterized in that, comprising: the brightness of image compensation dress as described in as arbitrary in claim 9-18Put.
20. equipment as claimed in claim 19, is characterized in that, described terminal device comprises:
Mobile phone, IPAD or, intelligent wearing equipment.
21. equipment as claimed in claim 19, is characterized in that, also comprise: be connected with described brightness of image compensation arrangementCentral processing unit and external memory, described central processing unit is used for controlling described external memory memory image.
22. equipment as claimed in claim 19, is characterized in that, also comprise: be connected with described brightness of image compensation arrangementCentral processing unit and display unit, described central processing unit is used for controlling described display unit and shows image.
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