CN103139572B - Photosensitive device and for its white balance method and device - Google Patents
Photosensitive device and for its white balance method and device Download PDFInfo
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Abstract
The present invention proposes a kind of photosensitive device and for its white balance method and device.White balance method comprises the following steps: determine with reference to white point according to the image information of input picture；The first colour cast difference and the second colour cast difference is calculated according to reference to white point；Blank level adjustment is judged whether according to the first colour cast difference and the second colour cast difference；If carried out blank level adjustment, determine photographed scene according to the image information of image；The scope of different channel gain values is determined according to photographed scene；Scope according to channel gain value and the step-length preset, adjust channel gain value to obtain the end value of channel gain value；And the Src Chan yield value of photosensitive device is adjusted according to the end value of channel gain value.The method according to the invention, adds the step determining image taking scene, and determines the adjusting range of different channel gain values under different photographed scenes, it is possible to accurately realize AWB under high color temperature shooting environmental.
Description
Technical field
The present invention relates to technical field of image processing, particularly to a kind of photosensitive device and for its white balance method and
Device.
Background technology
Generally under the conditions of different colour temperatures, the color of object can occur different change.Wherein, the change of white object
Changing the most obvious, such as, under low colour temperature (2600K) environment of indoor electric filament lamp, white object seems the reddest；
Under high color temperature (10000K) environment of fine day sunlight, white object seems partially blue.In order to reduce as far as possible
The impact that the color of object is caused by external light so that the image of shooting can show under different-colour environment
Object color originally, then need to carry out color and correct to realize real color balance, referred to as white balance.
At present, realize in the algorithm of AWB in RGB (Red, Green, Blue, red, green, blue) space,
Being typically based on G-value to adjust R value and the size of B value, first statistical computation is with reference to R, G, B average of white point
Value R_AVER, G_AVER and B_AVER, be respectively compared the difference of R_AVER and B_AVER and G_AVER
Value, judges the colour cast situation of current scene according to the size with G_AVER difference, so adjust R_AVER and
The size of B_AVER, i.e. regulation R passage and the size of channel B yield value R_GAIN and B_GAIN, it is achieved from
The adjustment of dynamic white balance.
Prior art there is problems of, and this AWB can be normal in the reference color temperature of 2500K-7500K
Adjust, but, under the scene that out of doors etc. colour temperature is higher, reflective due to some objects, these reflective spots are easy
It is judged as, with reference to white point, producing mistuning.
Summary of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
For reaching above-mentioned purpose, the embodiment of first aspect present invention proposes the white balance method of a kind of photosensitive device, bag
Include following steps: S1: the reference white point determining in described input picture according to the image information of input picture；S2: root
The first colour cast difference and the second colour cast difference is calculated with reference to white point according to described；S3: according to described first colour cast difference and institute
State the second colour cast difference and judge whether to blank level adjustment；S4: if it is determined that carry out blank level adjustment, then according to institute
The image information stating input picture determines the photographed scene of described input picture；S5: according to the shooting of described input picture
Scene determines the scope of different channel gain values；S6: according to scope and the default step-length of described channel gain value,
Adjust described channel gain value to obtain the end value of described channel gain value；And S7: according to described channel gain value
End value adjust described photosensitive device Src Chan yield value.
The white balance method of photosensitive device according to embodiments of the present invention, adds the step of the photographed scene determining image,
Under different photographed scenes, determine the adjusting range of different channel gain values, thus can wait higher color temperature out of doors
AWB is accurately realized under scene.
For reaching above-mentioned purpose, the embodiment of second aspect present invention proposes the white balancing apparatus of a kind of photosensitive device, bag
Include: colour cast computing module, for determining the reference white point in described input picture according to the image information of input picture,
And calculate the first colour cast difference and the second colour cast difference according to described with reference to white point；White balance judge module, for basis
Described first colour cast difference and the second colour cast difference judge whether described input picture carries out blank level adjustment；Channel gain
Value range determination module, for when described white balance judge module determine carry out blank level adjustment time, according to described input
The image information of image determines the photographed scene of described input picture, and determine the channel gain value of different photographed scene
Scope；And blank level adjustment module, for the scope according to described channel gain value and default step-length, adjust institute
State channel gain value to obtain the end value of described channel gain value.
The white balancing apparatus of photosensitive device according to embodiments of the present invention, is determined by the photographed scene of image, in difference
Photographed scene under change the adjusting range of channel gain value, thus can wait under the scene of higher color temperature the most real out of doors
Existing AWB.
For reaching above-mentioned purpose, the embodiment of a third aspect of the present invention also proposes a kind of photosensitive device, including: optics
Sensor, for obtaining the image of current scene；RGB channel analog gain module, is used for arranging described photosensitive device
Red, green, blue channel gain value；Digital Image Processing module, described Digital Image Processing module is led to described RGB
Road analog gain module connects, for processing to obtain to described image according to described red, green, blue channel gain value
Obtain the RGB data of described image；White balancing apparatus, described white balancing apparatus is connected with described Digital Image Processing module
With receive described image RGB data, and according to the RGB data of described image carry out blank level adjustment with obtain red,
Green, the final adjusted value of blue channel yield value, described white balancing apparatus is as according to any one of claim 10-23
White balancing apparatus；And feedback circuit, described feedback circuit is connected to described white balancing apparatus and simulates with described RGB channel
Between gain module, the end value of the channel gain value for being determined by described white balancing apparatus feeds back to described RGB and leads to
Road analog gain module is to be adjusted described red, green, blue channel gain value.
Photosensitive device according to embodiments of the present invention, by increasing the white balancing apparatus of the present invention, waits higher color out of doors
Can accurately realize AWB under the scene of temperature, shoot high-quality image.
Aspect and advantage that the present invention adds will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or that add aspect and advantage will become bright from the following description of the accompanying drawings of embodiments
Aobvious and easy to understand, wherein:
Fig. 1 is the white balance method flow chart of the photosensitive device of one embodiment of the invention；
Fig. 2 is the method flow diagram of the photographed scene of the determination input picture of the embodiment of the present invention；
Fig. 3 is the method flow diagram adjusting red channel gain value of the embodiment of the present invention；
Fig. 4 is the method flow diagram adjusting blue channel yield value of the embodiment of the present invention；
Fig. 5 is the structural representation of the white balancing apparatus of the photosensitive device of one embodiment of the invention；
Fig. 6 is the structural representation of the colour cast computing module of the embodiment of the present invention；
Fig. 7 is the structural representation of the channel gain value range determination module of the embodiment of the present invention；
Fig. 8 is the structural representation of the blank level adjustment module of the embodiment of the present invention；And
Fig. 9 is the structural representation of the photosensitive device of one embodiment of the invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Fig. 1 is the white balance method flow chart of the photosensitive device of one embodiment of the invention.As it is shown in figure 1, according to this
The white balance method of the photosensitive device of inventive embodiments, comprises the following steps:
Step S101, determines the reference white point in input picture according to the image information of input picture.
Specifically, it is judged that the red, green, blue component value of input picture meets below with reference to white point judgment formula the most simultaneously,
| R-G | ＜ LIMIT1, (10)
| B-G | ＜ LIMIT2, (11)
LIMIT3 ＜ G ＜ LIMIT4, (12)
Wherein, R, G, B are respectively the red, green, blue component value of the pixel of input picture, LIMIT1, LIMIT2,
LIMIT3 and LIMIT4 is respectively predetermined first and detects threshold value, the second detection threshold value, the 3rd detection threshold value and the 4th
Detection threshold value.
Wherein, the purpose of formula (10) and formula (11) is that finding out tri-color components of RGB differs smaller
Pixel.The purpose of formula (12) is to remove the pixel that brightness ratio is relatively low and the highest, and this is due to brightness ratio
The pixel RGB component value that relatively low and brightness ratio is higher all can not reflect color, truly so should remove.If
The red, green, blue component value of the pixel of input picture meets above-mentioned with reference to white point judgment formula (10), (11) simultaneously
(12), then pixel is with reference to white point.
Specifically, can by under different-colour (such as 2500K-7500K) shoot white object, statistics | R-G | and
The size of | B-G |, arranges the rational numerical value of comparison as the first detection threshold value LIMIT1 according to the size of | R-G | He | B-G |
With the second detection threshold value LIMIT2.And according to the characteristic of photosensitive device, the 3rd detection threshold value LIMIT3 and the 4th is set
Detection threshold value LIMIT4.
Step S102, calculates the first colour cast difference and the second colour cast difference according to reference to white point.
Specifically, first, statistical computation is with reference to red, green, blue component meansigma methods R_AVER of white point, G_AVER
And B_AVER.More specifically, respectively the red, green, blue component with reference to white point is carried out cumulative summation obtain reference white
Red, green, blue component total value R_SUB of point, G_SUB and B_SUB, count respectively further according to the number with reference to white point
Calculate and obtain with reference to red, green, blue component meansigma methods R_AVER of white point, G_AVER and B_AVER.
Then, according to red, green, blue component meansigma methods R_AVER, G_AVER and B_AVER, by following
Formula calculates described first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB,
R_AVER_SUB=R_AVER-G_AVER (20)
B_AVER_SUB=B_AVER-G_AVER (21)
Step S103, sentences according to the first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB
Break and whether carry out blank level adjustment.
Specifically, it is judged that the first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB are the most same
Time meet following white balance judgment formula,
| R_AVER_SUB | ＜ LOCK1 (30)
| B_AVER_SUB | ＜ LOCK2 (31)
Wherein, LOCK1 and LOCK2 is respectively the first predetermined colour cast threshold value and the second colour cast threshold value.
Should be understood that if to reach the first colour cast difference R_AVER_SUB=0 and the second colour cast difference
B_AVER_SUB=0 is relatively difficult, therefore, in an embodiment of the present invention, by setting the first colour cast threshold value LOCK1
With the second colour cast threshold value LOCK2 as colour cast judgment threshold, under conditions of ensureing that image will not shake, first
The precision of the value the least image blank level adjustment of colour cast threshold value LOCK1 and the second colour cast threshold value LOCK2 is the best.
The first colour cast threshold value LOCK1 and the second colour cast threshold value LOCK2 according to determining judge colour cast situation.If the
One colo(u)r bias value R_AVER_SUB and the second colour cast difference B_AVER_SUB meet white balance judgment formula simultaneously,
Now think that image does not occurs colour cast, then input picture does not carry out white balance process, otherwise needs to carry out blank level adjustment,
Continue executing with step S104.
In one embodiment of the invention, if the first colour cast difference R_AVER_SUB meets R_AVER_SUB ＞
LOCK1, then explanation present filming scene is partially red inclined, and colour temperature is low colour temperature；If the second colour cast difference
B_AVER_SUB meets B_AVER_SUB ＞ LOCK2, then explanation current scene is partially blue inclined, and colour temperature is high
Colour temperature.
Step S104, if it is determined that carry out blank level adjustment, then determines input picture according to the image information of input picture
Photographed scene.
Specifically, it is illustrated in figure 2 the method flow diagram of the photographed scene of the determination input picture of the embodiment of the present invention,
The method of the photographed scene of determination input picture according to embodiments of the present invention, specifically includes following steps,
Step S401, according to the red, green, blue component value of the pixel of input picture, calculates defeated by below equation
Enter the brightness value Y of each pixel of image,
Y=a*R+b*G+c*B,
Wherein, a, b, c are proportionality coefficient, and a+b+c=1, in one embodiment of the invention, proportionality coefficient a,
B, c value is respectively a=0.299, b=0.587, c=0.114.
Step S402, according to the average brightness of the brightness value Y calculating input image of each pixel of input picture
Y_AVER。
Step S403, it is judged that the time of exposure INT_TIME and average brightness Y_AVER of photosensitive device, if with
Time meet scene judgment formula, scene judgment formula is as follows,
INT_TIME ＜ INT_TH (40)
Y_AVER ＞ Y_TH (41)
Wherein, INT_TH is predetermined time of exposure threshold value, and Y_TH is predetermined luminance threshold, time of exposure threshold value
INT_TH can determine according to photosensitive device.
Step S404, if the time of exposure INT_TIME of average brightness Y_AVER and photosensitive device meets simultaneously
Scene judgment formula (40) and (41), then the photographed scene of input picture is Outdoor Scene, otherwise input picture
Photographed scene is indoor scene.
Step S105, determines the scope of channel gain value according to the photographed scene of input picture.
Specifically, if the photographed scene of input picture is Outdoor Scene, then channel gain is determined by below equation
The scope of value,
LIMIT5 ＜ R_GAIN ＜ LIMIT6 (50)
LIMIT7 ＜ B_GAIN ＜ LIMIT8 (51)
Wherein, R_GAIN and B_GAIN is the reddest, blue channel yield value, LIMIT5, LIMIT6, LIMIT7
With LIMIT8 be respectively the predetermined first outdoor gain threshold, the second outdoor gain threshold, the 3rd outdoor gain threshold and
4th outdoor gain threshold.In one embodiment of the invention, according to the colour temperature ring at indoor 2500K and 7500K
Pure color scene image is shot under border, the pure color scene image shot by statistics is red after blank level adjustment accurately,
Blue channel yield value R_GAIN and B_GAIN, gives the first outdoor gain threshold LIMIT5, the second outdoor increasing respectively
Benefit threshold value LIMIT6, the 3rd outdoor gain threshold LIMIT8 of outdoor gain threshold LIMIT7 and the 4th.
If the photographed scene of input picture is indoor scene, then determined the scope of channel gain value by below equation,
LIMIT9 ＜ R_GAIN ＜ LIMIT10 (52)
LIMIT11 ＜ B_GAIN ＜ LIMIT12 (53)
Wherein, LIMIT9, LIMIT10, LIMIT11 and LIMIT12 be respectively the predetermined first indoor gain threshold,
Gain threshold in second indoor gain threshold, the 3rd indoor gain threshold and fourth ventricle, in one embodiment of the present of invention
In, the scene more according to shooting substantial amounts of picture, particularly green plant out of doors, and through white balance accurately
Adjust, Selection effect be preferably worth as the first indoor gain threshold LIMIT9, the second indoor gain threshold LIMIT10,
The size of gain threshold LIMIT12 in 3rd indoor gain threshold LIMIT11 and fourth ventricle.So ensure that at family
Photosensitive device can be carried out correct blank level adjustment under each outer scene, will not be because of some reflective serious fields
Scape causes white balance mistake to adjust, and causes image generation colour cast phenomenon.
No matter out of doors under scene or indoor scene, all green channel gain value being set to predetermined value, in the present invention
An example in, green channel gain value can pre-deposit in the depositor of photosensitive device.
Step S106, according to scope and the default step-length of channel gain value, adjusts channel gain value and increases to obtain passage
The end value of benefit value.
Owing to outdoor and indoor colour temperature differs greatly, when therefore switching over, need longer adjustment process.In the present invention
An embodiment in, add the function that step-length selects, thus when different photographed scenes is mutually changed, regulation increases
The step-length that benefit adjusts, realizes image blank level adjustment more quickly.
Specifically, first, according to the first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB
Determine the step-length of channel gain value under different photographed scene.Then, according to step-length, the first colour cast difference
The scope of R_AVER_SUB, the second colour cast difference B_AVER_SUB and channel gain value adjusts channel gain value,
To obtain the end value of channel gain value.
Such as, it is judged that whether the first colour cast difference R_AVER_SUB meets the first following step-length selects formula,
| R_AVER_SUB | ＞ LOCK3 (60)
Wherein, the inclined threshold value of tertiary color that LOCK3 is predetermined, and meet LOCK3 ＞ LOCK1 to prevent needs
Little step-length have selected big step-length when adjusting, and adjustment phenomenon occurred.
If the first colour cast difference R_AVER_SUB meets the first step-length selects formula, then select red channel gain value
The step-length of R_GAIN is the first predetermined step-length STEP1, and the step-length otherwise selecting red channel gain value R_GAIN is
The second predetermined step-length STEP2, wherein STEP1 ＞ STEP2 ＞ 0.Thus, can select different according to concrete scene
Step-length, increases regulated efficiency and the precision of white balance.
Judge whether the second colour cast difference B_AVER_SUB meets the second following step-length and select formula,
| B_AVER_SUB | ＞ LOCK4 (61)
Wherein, LOCK4 is the 4th predetermined colour cast threshold value, and LOCK4 ＞ LOCK2 needs small step to prevent
Have selected big step-length during long adjustment, adjustment phenomenon occurred.
If the second colour cast difference B_AVER_SUB meets the second step-length selects formula, then select blue channel yield value
The step-length of B_GAIN is the first predetermined step-length STEP1, and otherwise the step-length of selection blue channel yield value B_GAIN is
The second predetermined step-length STEP2.
It should be understood that red channel gain value R_GAIN and blue channel yield value B_GAIN step-length determination regardless of
Sequencing.The step-length of red channel gain value R_GAIN and blue channel yield value B_GAIN can be identical, it is also possible to
Different.Specifically, the degree of accuracy according to R_GAIN and B_GAIN value sets the size of STEP1 and STEP2.
It is illustrated in figure 3 the method flow diagram adjusting red channel gain value of the embodiment of the present invention, implements according to the present invention
The method adjusting red channel gain value of example, specifically includes following steps,
Step S701, it is judged that whether the first colour cast difference R_AVER_SUB is more than 0.
Step S702, if the first colour cast difference R_AVER_SUB ＞ 0, the reddest channel gain value R_GAIN increases
One step-length.
Specifically, the big I of the step-length that red channel gain value R_GAIN increases is according to the first colour cast difference
R_AVER_SUB determines.If the first colour cast difference R_AVER_SUB meets the first above-mentioned step-length selects formula,
The reddest channel gain value R_GAIN increases by first step-length STEP1, if the first colour cast difference R_AVER_SUB
Being unsatisfactory for the first above-mentioned step-length and select formula, the reddest channel gain value R_GAIN increases by second step-length STEP2.
Step S703, if the first colour cast difference R_AVER_SUB ＜ 0, the reddest channel gain value R_GAIN reduces
One step-length.
Specifically, the big I of the step-length that red channel gain value R_GAIN reduces is according to the first colour cast difference
R_AVER_SUB determines.If the first colour cast difference R_AVER_SUB meets the first above-mentioned step-length selects formula,
The reddest channel gain value R_GAIN reduces first step-length STEP1, if the first colour cast difference R_AVER_SUB
Being unsatisfactory for the first above-mentioned step-length and select formula, the reddest channel gain value R_GAIN reduces second step-length STEP2.
Step S704, it is judged that whether red channel gain value R_GAIN after adjustment is in the range of red channel gain value.
Step S705, if red channel gain value R_GAIN after Tiao Zhenging is not in the range of red channel gain value, then weighs
Multiple above-mentioned set-up procedure S702 is to step S704.
Step S706, if red channel gain value R_GAIN after Tiao Zhenging is in the range of red channel gain value, then adjusts
After the end value that red channel gain value R_GAIN is red channel gain value.
It is illustrated in figure 4 the method flow diagram adjusting blue channel yield value of the embodiment of the present invention, implements according to the present invention
The method adjusting blue channel yield value of example, specifically includes following steps,
Step S707, it is judged that whether the second colour cast difference B_AVER_SUB is more than 0.
Step S708, if the second colour cast difference B_AVER_SUB ＞ 0, then blue channel yield value B_GAIN increases
One step-length.
Specifically, the big I of the step-length that blue channel yield value B_GAIN increases is according to the second colour cast difference
B_AVER_SUB determines.If the second colour cast difference B_AVER_SUB meets the second above-mentioned step-length selects formula,
Then blue channel yield value B_GAIN increases by first step-length STEP1, if the second colour cast difference B_AVER_SUB
Be unsatisfactory for the second above-mentioned step-length and select formula, then blue channel yield value B_GAIN increases by second step-length STEP2.
Step S709, if the second colour cast difference B_AVER_SUB ＜ 0, then blue channel yield value B_GAIN reduces
One step-length.
Specifically, the big I of the step-length that blue channel yield value B_GAIN reduces is according to the second colour cast difference
B_AVER_SUB determines.If the second colour cast difference B_AVER_SUB meets the second above-mentioned step-length selects formula,
Then blue channel yield value B_GAIN reduces first step-length STEP1, if the second colour cast difference B_AVER_SUB
Be unsatisfactory for the second above-mentioned step-length and select formula, then blue channel yield value B_GAIN reduces second step-length STEP2.
Step S7010, it is judged that whether the blue channel yield value B_GAIN after adjustment is in the range of blue channel yield value.
Step S7011, if the blue channel yield value B_GAIN after Tiao Zhenging is not in the range of blue channel yield value, then
Repeat above-mentioned set-up procedure S708 to step S7010.
Step S7012, if the blue channel yield value B_GAIN after Tiao Zhenging is in the range of blue channel yield value, then adjusts
The end value that blue channel yield value B_GAIN is blue channel yield value after whole.
It should be understood that the red channel gain value of adjustment and adjust blue channel yield value regardless of tandem.
Step S107, adjusts the Src Chan yield value of photosensitive device according to the end value of channel gain value.
It should be understood that the white balance method of photosensitive device described in embodiments of the invention on the basis of G component, point
Not Tiao Zheng R passage and the yield value of channel B, change image R component and B component, it is achieved the blank level adjustment of image.
In other embodiments of the invention, it is also possible on the basis of other components, such as, adjust respectively on the basis of R component
G passage and the yield value of channel B, change image G component and B component and realize the blank level adjustment of image, and these change
Become and change should be included within the scope of the present invention.
The white balance method of photosensitive device according to embodiments of the present invention, on the one hand by adding the shooting determining image
The step of scene, changes the adjusting range of channel gain value under different photographed scenes, thus can wait higher out of doors
AWB is accurately realized under the scene of colour temperature；On the other hand, select according to the first colour cast difference and the second colour cast difference
Select different step-lengths, thus when different photographed scenes is mutually changed, the step-length of regulation Gain tuning, more quickly
Realize image blank level adjustment, such as, can be in the case of two kinds of colour temperature temperature difference be relatively big, as worked as color in indoor scene
When temperature changes greatly, first select larger step size to carry out coarse adjustment, then select less step-length fine tuning, which thereby enhance color
During temperature change, AWB regulates the speed.
Fig. 5 is the structural representation of the white balancing apparatus of the photosensitive device of one embodiment of the invention.As it is shown in figure 5,
The white balancing apparatus of photosensitive device according to embodiments of the present invention, including colour cast computing module 100, white balance judge module
200, channel gain value range determination module 300 and blank level adjustment module 400.
Wherein, colour cast computing module 100 for determining the reference white in input picture according to the image information of input picture
Point, and calculate the first colour cast difference and the second colour cast difference according to reference to white point.White balance judge module 200 is for root
Judge whether input picture carries out blank level adjustment according to the first colour cast difference and the second colour cast difference.Channel gain value scope
Determine module 300 for when white balance judge module 200 determine carry out blank level adjustment time, according to the figure of input picture
As information determines the photographed scene of input picture, and determine the scope of channel gain value.Blank level adjustment module 400 is used
In the scope according to channel gain value and default step-length, adjust channel gain value to obtain the end value of channel gain value.
Fig. 6 is the structural representation of the colour cast computing module of the embodiment of the present invention.As shown in Figure 6, at one of the present invention
In embodiment, colour cast computing module 100 includes reference white point detector unit 110 and colour cast computing unit 120.
Wherein, reference white point detector unit 110 is for determining input figure according to the red, green, blue component value of input picture
Reference white point in Xiang.Colour cast computing unit 120 is for calculating reference according to the red, green, blue component value with reference to white point
The red, green, blue component meansigma methods of white point, and according to red, green, blue component mean value calculation the first color with reference to white point
Deviation value and the second colour cast difference.
Fig. 7 is the structural representation of the channel gain value range determination module of the embodiment of the present invention.As it is shown in fig. 7,
In one embodiment of the present of invention, channel gain value range determination module 300 includes average luminance computing unit 310, claps
Take the photograph scene and determine that unit 320, outdoor channel yield value determine that unit 330 and indoor channel yield value determine unit 340.
Wherein, average luminance computing unit 310 is based on the red, green, blue component value of the pixel according to input picture
Calculate the average brightness of input picture.Photographed scene determine unit 320 for the average brightness according to input picture and
The time of exposure of photosensitive device, it is judged that the photographed scene of input picture is Outdoor Scene or indoor scene.Outdoor channel increases
Benefit value determines that unit 330 is for determining the channel gain value scope of Outdoor Scene.Indoor channel yield value determines unit 340
For determining the channel gain value scope of indoor scene.
Fig. 8 is the structural representation of the blank level adjustment module of the embodiment of the present invention.As shown in Figure 8, in the one of the present invention
In individual embodiment, blank level adjustment module 400 includes first step size determination unit the 410, second step size determination unit 420
With blank level adjustment unit 430.
Wherein, the first step size determination unit 410 for determining the step-length of red channel gain value according to the first colour cast difference.
Second step size determination unit 420 for determining the step-length of blue channel yield value according to the second colour cast difference.Blank level adjustment
Unit 430 for respectively according to the step-length of red channel gain value and the step-length of blue channel yield value to red channel gain value and
Blue channel yield value is adjusted.
Should be understood that the specific operation process of the modules in assembly of the invention embodiment and unit can be implemented with method
Description in example is identical, is not described in detail herein.
The white balancing apparatus of photosensitive device according to embodiments of the present invention, is on the one hand determined by the photographed scene of image,
Under different photographed scenes, change the adjusting range of channel gain value, thus can wait out of doors under the scene of higher color temperature
Accurately realize AWB；On the other hand, select different step-lengths according to the first colour cast difference with the second colour cast difference,
Thus when different photographed scenes is mutually changed, the step-length of regulation Gain tuning, realize image white balance more quickly
Adjust.Additionally, assembly of the invention realizes simple, cost is relatively low.
Fig. 9 is the structural representation of the photosensitive device of one embodiment of the invention.As it is shown in figure 9, it is real according to the present invention
Execute the photosensitive device of example, including optical pickocff 1, RGB channel analog gain module 2, white balancing apparatus 3, feedback
Circuit 4 and numeral image processing module 5.
Wherein, optical pickocff 1 is for obtaining the image of current scene.RGB channel analog gain module 2 and optics
Sensor 1 is connected, for arranging the red, green, blue channel gain value of photosensitive device.Digital Image Processing module 5 with
RGB channel gain analog module 2 is connected, for processing to obtain to image according to red, green, blue channel gain value
Obtain the RGB data of image.White balancing apparatus 3 be connected with Digital Image Processing module 5 with receive image RGB number
According to, and carry out blank level adjustment to obtain the final adjustment of red, green, blue channel gain value according to the RGB data of image
Value, white balancing apparatus 3 is the white balancing apparatus described in the invention described above embodiment.Feedback circuit 4 is connected to white balance
Between device 3 and RGB channel analog gain module 2, for channel gain value that white balancing apparatus 3 is determined
Whole adjusted value feeds back to RGB channel analog gain module 2 to be adjusted red, green, blue channel gain value.
It should be noted that in embodiments of the present invention, the blank level adjustment carried out in white balancing apparatus 3 is at RGB
Space realizes, and after namely needing the view data of other color spaces is transformed into rgb space data, reapplies
The white balance adjustment method of the embodiment of the present invention.
Photosensitive device according to embodiments of the present invention, by increasing the white balancing apparatus of the present invention, waits higher color out of doors
Can accurately realize AWB under the scene of temperature, shoot high-quality image, meanwhile, according to different shooting fields
Scape implements different blank level adjustments, when switching between different photographed scenes, selects different adjustment step-lengths,
Accomplish that quick AWB adjusts, it is achieved accurate, the quick obtaining of shooting image.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible
Understand these embodiments can be carried out without departing from the principles and spirit of the present invention multiple change, amendment,
Replacing and modification, the scope of the present invention is limited by claims and equivalent thereof.
Claims (24)
1. the white balance method of a photosensitive device, it is characterised in that comprise the following steps:
S1: determine the reference white point in described input picture according to the image information of input picture；
S2: calculate the first colour cast difference and the second colour cast difference with reference to white point according to described；
S3: judge whether to white balance according to described first colour cast difference and described second colour cast difference and adjust
Whole；
S4: if it is determined that carry out blank level adjustment, then according to average brightness and the institute of described input picture
State the time of exposure of photosensitive device and determine that the photographed scene of described input picture is Outdoor Scene or indoor field
Scape；
S5: determine the scope of different channel gain values according to the photographed scene of described input picture；
S6: according to the scope of described channel gain value and the step-length preset, adjust described channel gain value with
Obtain the end value of described channel gain value；And
S7: adjust the Src Chan gain of described photosensitive device according to the end value of described channel gain value
Value.
The white balance method of photosensitive device the most according to claim 1, it is characterised in that described
Step S1 specifically includes:
S11: judge that the red, green, blue component value of described input picture meets below with reference in vain the most simultaneously
Point judgment formula,
| R-G | < LIMIT1,
| B-G | < LIMIT2,
LIMIT3 < G < LIMIT4,
Wherein, R, G, B are respectively the red, green, blue component value of pixel, LIMIT1, LIMIT2,
LIMIT3 and LIMIT4 is respectively predetermined first and detects threshold value, the second detection threshold value, the 3rd detection
Threshold value and the 4th detection threshold value；And
S12: if the red, green, blue component value of the pixel of described input picture meets described ginseng simultaneously
Examining white point judgment formula, the most described pixel is with reference to white point.
The white balance method of photosensitive device the most according to claim 1, it is characterised in that described
Step S2 specifically includes:
S21: with reference to red, green, blue component meansigma methods R_AVER of white point, G_AVER described in statistical computation
And B_AVER；And
S22: according to described red, green, blue component meansigma methods R_AVER, G_AVER and B_AVER is logical
Cross below equation and calculate described first colour cast difference R_AVER_SUB and the second colour cast difference
B_AVER_SUB,
R_AVER_SUB=R_AVER-G_AVER,
B_AVER_SUB=B_AVER-G_AVER.
The white balance method of photosensitive device the most according to claim 1, it is characterised in that described
Step S3 specifically includes:
S31: judge described first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB
Meet following white balance judgment formula the most simultaneously,
| R_AVER_SUB | < LOCK1,
| B_AVER_SUB | < LOCK2,
Wherein, LOCK1 and LOCK2 is respectively the first predetermined colour cast threshold value and the second colour cast threshold value；With
And
S32: if described first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB
Meeting described white balance judgment formula, the most described input picture does not carry out white balance process, otherwise simultaneously
Continue step S4.
The white balance method of photosensitive device the most according to claim 1, it is characterised in that described
Step S4 specifically includes:
S41: according to the red, green, blue component value of the pixel of described input picture, according to below equation
Calculate the brightness value Y of each pixel of described input picture,
Y=a*R+b*G+c*B,
Wherein, a, b, c are proportionality coefficient, and a+b+c=1；
S42: calculate described input picture according to the brightness value Y of each pixel of described input picture
Average brightness Y_AVER；
S43: according to time of exposure INT_TIME and the described average brightness of described photosensitive device
Y_AVER, judges the photographed scene of described input picture by following scene judgment formula,
INT_TIME < INT_TH,
Y_AVER > Y_TH,
Wherein, INT_TH is predetermined time of exposure threshold value, and Y_TH is predetermined luminance threshold；And
S44: if the time of exposure INT_TIME of described average brightness Y_AVER and photosensitive device is same
Time meet described scene judgment formula, the photographed scene of the most described input picture is Outdoor Scene, otherwise
The photographed scene of described input picture is indoor scene.
The white balance method of photosensitive device the most according to claim 1, it is characterised in that described
Step S5 specifically includes:
If the photographed scene of described input picture is Outdoor Scene, then determined described by below equation
The scope of channel gain value,
LIMIT5 < R_GAIN < LIMIT6,
LIMIT7 < B_GAIN < LIMIT8,
Wherein, R_GAIN and B_GAIN is the reddest, blue channel yield value, LIMIT5, LIMIT6,
LIMIT7 and LIMIT8 be respectively the predetermined first outdoor gain threshold, the second outdoor gain threshold,
3rd outdoor gain threshold and the 4th outdoor gain threshold；And
If the photographed scene of described input picture is indoor scene, then determined described by below equation
The scope of channel gain value,
LIMIT9 < R_GAIN < LIMIT10,
LIMIT11 < B_GAIN < LIMIT12,
Wherein, LIMIT9, LIMIT10, LIMIT11 and LIMIT12 are respectively the first predetermined indoor
Gain threshold in gain threshold, the second indoor gain threshold, the 3rd indoor gain threshold and fourth ventricle,
Wherein, green channel gain value is predetermined value.
The white balance method of photosensitive device the most according to claim 4, it is characterised in that institute
State step S6 to specifically include:
S61: determine under different photographed scene according to described first colour cast difference and described second colour cast difference
Default step-length；
S62: according to described default step-length, the first colour cast difference, the second colour cast difference and channel gain value
Scope, adjust described channel gain value with obtain described channel gain value end value.
The white balance method of photosensitive device the most according to claim 7, it is characterised in that described
Step S61 specifically includes:
S611: judge whether described first colour cast difference R_AVER_SUB meets the first following step-length choosing
Select formula,
| R_AVER_SUB | > LOCK3,
Wherein, the inclined threshold value of tertiary color that LOCK3 is predetermined, and LOCK3 > LOCK1；
S612: if described first colour cast difference R_AVER_SUB meets described first step-length and selects formula,
The step-length then selecting red channel gain value R_GAIN is the first predetermined step-length STEP1, otherwise selects institute
The step-length stating red channel gain value R_GAIN is the second predetermined step-length STEP2, wherein STEP1 >
STEP2>0；
S613: judge whether described second colour cast difference B_AVER_SUB meets the second following step-length choosing
Select formula,
| B_AVER_SUB | > LOCK4,
Wherein, LOCK4 is the 4th predetermined colour cast threshold value, and LOCK4 > LOCK2；
S614: if described second colour cast difference B_AVER_SUB meets described second step-length and selects formula,
The step-length then selecting blue channel yield value B_GAIN is described the first predetermined step-length STEP1, otherwise selects
The step-length selecting described blue channel yield value B_GAIN is described the second predetermined step-length STEP2.
The white balance method of photosensitive device the most according to claim 8, it is characterised in that described
Step S62 specifically includes:
S621: judge that whether described first colour cast difference R_AVER_SUB is more than 0；
S622: if described first colour cast difference R_AVER_SUB > 0, and described first colour cast difference
R_AVER_SUB meets described first step-length and selects formula, and the most described red channel gain value R_GAIN increases
Add described first step-length；
S623: if described first colour cast difference R_AVER_SUB > 0, and described first colour cast difference
R_AVER_SUB is unsatisfactory for described first step-length and selects formula, the most described red channel gain value R_GAIN
Increase described second step-length；
S624: if described first colour cast difference R_AVER_SUB < 0, and described first colour cast difference
R_AVER_SUB meets described first step-length and selects formula, and the most described red channel gain value R_GAIN subtracts
Little described first step-length；
S625: if described first colour cast difference R_AVER_SUB < 0, and described first colour cast difference
R_AVER_SUB is unsatisfactory for described first step-length and selects formula, the most described red channel gain value R_GAIN
Reduce described second step-length；
S626: repetition step S622 is to step S625, until described red channel gain value R_GAIN exists
In the range of described red channel gain value；
S627: judge that whether described second colour cast difference B_AVER_SUB is more than 0；
S628: if described second colour cast difference B_AVER_SUB > 0, and described second colour cast difference
B_AVER_SUB meets described second step-length and selects formula, and the most described blue channel yield value B_GAIN increases
Add described first step-length；
S629: if described second colour cast difference B_AVER_SUB > 0, and described second colour cast difference
B_AVER_SUB is unsatisfactory for described second step-length and selects formula, the most described blue channel yield value B_GAIN
Increase described second step-length；
S6210: if described second colour cast difference B_AVER_SUB < 0, and described second colour cast difference
B_AVER_SUB meets described second step-length and selects formula, and the most described blue channel yield value B_GAIN subtracts
Little described first step-length；
S6211: if described second colour cast difference B_AVER_SUB < 0, and described second colour cast difference
B_AVER_SUB is unsatisfactory for described second step-length and selects formula, the most described blue channel yield value B_GAIN
Reduce described second step-length；And
S6212: repetition step S628 is to step S6211, until described blue channel yield value B_GAIN
In the range of described blue channel yield value.
10. the white balancing apparatus of a photosensitive device, it is characterised in that including:
Colour cast computing module, for determining the ginseng in described input picture according to the image information of input picture
Examine white point, and calculate the first colour cast difference and the second colour cast difference according to described with reference to white point；
White balance judge module, for judging described according to described first colour cast difference and the second colour cast difference
Whether input picture carries out blank level adjustment；
Channel gain value range determination module, for carrying out white balance when described white balance judge module determines
During adjustment, determine according to the average brightness of described input picture and the time of exposure of described photosensitive device
The photographed scene of described input picture is Outdoor Scene or indoor scene, and determines different photographed scene
The scope of channel gain value；And
Blank level adjustment module, for the scope according to described channel gain value and default step-length, adjusts
Described channel gain value is to obtain the end value of described channel gain value.
The white balancing apparatus of 11. photosensitive devices according to claim 10, it is characterised in that institute
State colour cast computing module to specifically include:
Reference white point detector unit, for determining institute according to the red, green, blue component value of described input picture
State the reference white point in input picture；And
Colour cast computing unit, for calculating reference white according to the described red, green, blue component value with reference to white point
The red, green, blue component meansigma methods of point, and average according to the described red, green, blue component with reference to white point
Value calculates described first colour cast difference and the second colour cast difference.
The white balancing apparatus of 12. photosensitive devices according to claim 11, it is characterised in that institute
State reference white point detector unit to be determined in described input picture by following reference white point judgment formula
With reference to white point,
| R-G | < LIMIT1,
| B-G | < LIMIT2,
LIMIT3 < G < LIMIT4,
Wherein, R, G, B are respectively the red, green, blue component value of the pixel in described input picture,
LIMIT1, LIMIT2, LIMIT3 and LIMIT4 are respectively predetermined first and detect threshold value, the second inspection
Survey threshold value, the 3rd detection threshold value and the 4th detection threshold value,
If the red, green, blue component value of the pixel of described input picture meets described with reference to white point simultaneously
Judgment formula, the most described pixel is with reference to white point, and otherwise, described pixel is not with reference to white point.
The white balancing apparatus of 13. photosensitive devices according to claim 11, it is characterised in that institute
State colour cast computing unit and calculate described first colour cast difference R_AVER_SUB and by below equation
Two colour cast differences B_AVER_SUB,
R_AVER_SUB=R_AVER-G_AVER,
B_AVER_SUB=B_AVER-G_AVER,
Wherein, R_AVER, G_AVER and B_AVER are respectively red, green, blue component meansigma methods.
The white balancing apparatus of 14. photosensitive devices according to claim 10, it is characterised in that white
By following white balance judgment formula, balance judge module judges whether described input picture is carried out white flat
Weighing apparatus adjusts,
| R_AVER_SUB | < LOCK1,
| B_AVER_SUB | < LOCK2,
Wherein, LOCK1 and LOCK2 is respectively the first predetermined colour cast threshold value and the second colour cast threshold value,
If described first colour cast difference R_AVER_SUB and the second colour cast difference B_AVER_SUB are simultaneously full
The described white balance judgment formula of foot, the most described input picture does not carry out white balance process, the most described defeated
Enter image and carry out white balance process.
The white balancing apparatus of 15. photosensitive devices according to claim 10, it is characterised in that institute
State channel gain value range determination module to specifically include:
Average luminance computing unit, for the red, green, blue component of the pixel according to described input picture
Value calculates the average brightness of described input picture；
Photographed scene determines unit, for according to the average brightness of described input picture and photosensitive device
Time of exposure, it is judged that the photographed scene of described input picture is Outdoor Scene or indoor scene；
Outdoor channel yield value determines unit, for determining the channel gain value scope of Outdoor Scene；With
Indoor channel yield value determines unit, for determining the channel gain value scope of indoor scene.
The white balancing apparatus of 16. photosensitive devices according to claim 15, it is characterised in that institute
State average luminance computing unit and calculated the average brightness of described input picture by below equation,
Yi=a*Ri+b*Gi+c*Bi,
Wherein, YiFor the brightness value of ith pixel point, Ri、GiAnd BiIt is respectively ith pixel point
Red, green, blue component value, Y_AVER is the average brightness of input picture, and n is the picture of input picture
The number of vegetarian refreshments, a, b and c are proportionality coefficient, and a+b+c=1.
The white balancing apparatus of 17. photosensitive devices according to claim 15, it is characterised in that institute
State photographed scene and determine that unit determines the shooting field of described input picture by following scene judgment formula
Scape,
INT_TIME < INT_TH,
Y_AVER > Y_TH,
Wherein, INT_TIME is the time of exposure of described photosensitive device, when INT_TH is predetermined exposure
Between threshold value, Y_TH is predetermined luminance threshold,
If the time of exposure INT_TIME of described average brightness Y_AVER and photosensitive device meets simultaneously
Described scene judgment formula, the photographed scene of the most described input picture is Outdoor Scene, the most described defeated
The photographed scene entering image is indoor scene.
The white balancing apparatus of 18. photosensitive devices according to claim 15, it is characterised in that logical
Cross below equation and determine the channel gain value scope of Outdoor Scene,
LIMIT5 < R_GAIN < LIMIT6,
LIMIT7 < B_GAIN < LIMIT8,
Wherein, R_GAIN and B_GAIN is the reddest, blue channel yield value, LIMIT5, LIMIT6,
LIMIT7 and LIMIT8 be respectively the predetermined first outdoor gain threshold, the second outdoor gain threshold,
3rd outdoor gain threshold and the 4th outdoor gain threshold, green channel gain value is predetermined value.
The white balancing apparatus of 19. photosensitive devices according to claim 15, it is characterised in that logical
Cross below equation and determine the channel gain value scope of indoor scene,
LIMIT9 < R_GAIN < LIMIT10,
LIMIT11 < B_GAIN < LIMIT12,
Wherein, LIMIT9, LIMIT10, LIMIT11 and LIMIT12 are respectively the first predetermined indoor
Gain threshold in gain threshold, the second indoor gain threshold, the 3rd indoor gain threshold and fourth ventricle,
Green channel gain value is predetermined value.
The white balancing apparatus of 20. photosensitive devices according to claim 10, it is characterised in that institute
State blank level adjustment module to specifically include:
First step size determination unit, for determining the step of red channel gain value according to described first colour cast difference
Long；
Second step size determination unit, for determining the step of blue channel yield value according to described second colour cast difference
Long；With
Blank level adjustment unit, for respectively according to step-length and the described blue channel gain of red channel gain value
Described red channel gain value and described blue channel yield value are adjusted by the step-length of value.
The white balancing apparatus of 21. photosensitive devices according to claim 20, it is characterised in that institute
Stating the first step size determination unit selects formula to determine described red channel gain value by the first following step-length
Step-length,
| R_AVER_SUB | > LOCK3,
Wherein, the inclined threshold value of tertiary color that LOCK3 is predetermined, and LOCK3 > LOCK1,
If described first colour cast difference R_AVER_SUB meets described first step-length selects formula, then select
The step-length selecting described red channel gain value R_GAIN is the first predetermined step-length STEP1, otherwise selects institute
The step-length stating red channel gain value R_GAIN is the second predetermined adjustment step-length STEP2, wherein STEP1 >
STEP2>0。
The white balancing apparatus of 22. photosensitive devices according to claim 20, it is characterised in that institute
Stating the second step size determination unit selects formula to determine described blue channel yield value by the second following step-length
Step-length,
| B_AVER_SUB | > LOCK4,
Wherein, LOCK4 is the 4th predetermined colour cast threshold value, and LOCK4 > LOCK2,
If described second colour cast difference B_AVER_SUB meets described second step-length selects formula, then select
The step-length selecting described blue channel yield value B_GAIN is described the first predetermined step-length STEP1, otherwise selects
The step-length selecting described blue channel yield value B_GAIN is described the second predetermined step-length STEP2.
The white balancing apparatus of 23. photosensitive devices according to claim 20, it is characterised in that institute
State blank level adjustment unit to specifically include:
Judge that whether described first colour cast difference R_AVER_SUB is more than 0；
If described first colour cast difference R_AVER_SUB > 0, and described first colour cast difference
R_AVER_SUB meets described first step-length and selects formula, and the most described red channel gain value R_GAIN increases
Add described first step-length；
If described first colour cast difference R_AVER_SUB > 0, and described first colour cast difference
R_AVER_SUB is unsatisfactory for described first step-length and selects formula, the most described red channel gain value R_GAIN
Increase described second step-length；
If described first colour cast difference R_AVER_SUB < 0, and described first colour cast difference
R_AVER_SUB meets described first step-length and selects formula, and the most described red channel gain value R_GAIN subtracts
Little described first step-length；
If described first colour cast difference R_AVER_SUB < 0, and described first colour cast difference
R_AVER_SUB is unsatisfactory for described first step-length and selects formula, the most described red channel gain value R_GAIN
Reduce described second step-length；
Judge that whether described second colour cast difference B_AVER_SUB is more than 0；
If described second colour cast difference B_AVER_SUB > 0, and described second colour cast difference
B_AVER_SUB meets described second step-length and selects formula, and the most described blue channel yield value B_GAIN increases
Add described first step-length；
If described second colour cast difference B_AVER_SUB > 0, and described second colour cast difference
B_AVER_SUB is unsatisfactory for described second step-length and selects formula, the most described blue channel yield value B_GAIN
Increase described second step-length；
If described second colour cast difference B_AVER_SUB < 0, and described second colour cast difference
B_AVER_SUB meets described second step-length and selects formula, and the most described blue channel yield value B_GAIN subtracts
Little described first step-length；And
If described second colour cast difference B_AVER_SUB < 0, and described second colour cast difference
B_AVER_SUB is unsatisfactory for described second step-length and selects formula, the most described blue channel yield value B_GAIN
Reduce described second step-length.
24. 1 kinds of photosensitive devices, it is characterised in that including:
Optical pickocff, for obtaining the image of current scene；
RGB channel analog gain module, for arranging the red, green, blue channel gain of described photosensitive device
Value；
Digital Image Processing module, described Digital Image Processing module and described RGB channel analog gain mould
Block connects, for processing to obtain to described image according to described red, green, blue channel gain value
The RGB data of described image；
White balancing apparatus, described white balancing apparatus is connected to receive described with described Digital Image Processing module
The RGB data of image, and according to the RGB data of described image carry out blank level adjustment with obtain red,
Green, the final adjusted value of blue channel yield value, described white balancing apparatus is as in claim 10-23
White balancing apparatus described in any one；With
Feedback circuit, described feedback circuit is connected to described white balancing apparatus and increases with the simulation of described RGB channel
Between benefit module, final for red, green, blue channel gain value that described white balancing apparatus is determined
Adjusted value feeds back to described RGB channel analog gain module with to described red, green, blue channel gain value
It is adjusted.
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| JP2015012304A (en) * | 2013-06-26 | 2015-01-19 | ソニー株式会社 | Image processing apparatus, image processing method, and program |
| CN106454285B (en) * | 2015-08-11 | 2019-04-19 | 比亚迪股份有限公司 | The adjustment system and method for adjustment of white balance |
| CN106878690A (en) * | 2015-12-14 | 2017-06-20 | 比亚迪股份有限公司 | The imaging method of imageing sensor, imaging device and electronic equipment |
| CN105959662B (en) * | 2016-05-24 | 2017-11-24 | 深圳英飞拓科技股份有限公司 | Self-adapted white balance method of adjustment and device |
| CN105915875B (en) * | 2016-06-01 | 2017-10-13 | 广东欧珀移动通信有限公司 | White balance calibration method and apparatus and its calibration parameter preparation method and device |
| CN106131376B (en) * | 2016-07-21 | 2019-02-12 | 浙江大华技术股份有限公司 | A kind of indoor and outdoor scene determines method and device |
| CN108632582B (en) * | 2017-03-17 | 2019-12-27 | 比亚迪股份有限公司 | White balance adjusting method and device for image |
| CN109119009A (en) * | 2017-06-26 | 2019-01-01 | 深圳回收宝科技有限公司 | Screen defect inspection method, detection device, system and storage medium |
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