CN105915875A - White balance calibration method and device and calibration parameter obtaining method and device thereof - Google Patents
White balance calibration method and device and calibration parameter obtaining method and device thereof Download PDFInfo
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- CN105915875A CN105915875A CN201610389007.6A CN201610389007A CN105915875A CN 105915875 A CN105915875 A CN 105915875A CN 201610389007 A CN201610389007 A CN 201610389007A CN 105915875 A CN105915875 A CN 105915875A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
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Abstract
The invention relates to a white balance calibration method and device and a calibration parameter obtaining method and device thereof. The white balance calibration parameter obtaining method comprises the steps of: obtaining an eyeball area in an image to be calibrated; according to the eyeball area, obtaining an RGB ratio of the eyeball area; according to the RGB ratio, determining whether the eyeball area is gray; and if yes, determining that the RGB ratio is a white balance calibration parameter. The white balance calibration parameter obtaining device comprises an eyeball area obtaining module used for obtaining the eyeball area in the image to be calibrated; an RGB ratio obtaining module used for obtaining the RGB ratio of the eyeball area according to the eyeball area; a gray detection module used for determining whether the eyeball area is gray according to the RGB ratio; and a white balance calibration parameter determining module used for determining that the RGB ratio is the white balance calibration parameter when the eyeball area is gray. According to the invention, the white balance is restored without the influences of environment light and a background.
Description
Technical field
The present invention relates to white balancing techniques field, particularly relate to a kind of white balance calibration gain of parameter method,
White balance calibration gain of parameter device, white balance calibration method and white balance calibration device.
Background technology
White balance is the very important concept in one, telephotography field, by it can solve color rendition and
The series of problems that tone processes.The most basic principle of white balance is exactly that the thing of white is reduced into white.
But, after sensor (sensor) output image, (Image Signal Processor, at picture signal for ISP
Reason) it is not aware which block region itself is white, the R/G (red green) of entire image, B/G can only be added up
(blue green), then goes to estimate which is to need to be reduced into R:G:B=1:1:1 by algorithm.The most once occur
The when of mixed light scene or color single object, white balance arises that the defects such as reduction is inaccurate.
Summary of the invention
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of white balance calibration method and apparatus and calibration thereof
Gain of parameter method and apparatus, it is possible to do not affected by ambient light and background, accurate reproduction white balance.
In order to achieve the above object, the technical scheme that the present invention takes is as follows:
A kind of white balance calibration gain of parameter method, including step:
Obtain the eyeball in image to be calibrated；
The RGB ratio of described eyeball is obtained according to described eyeball；
Determine whether described eyeball is Lycoperdon polymorphum Vitt according to described RGB ratio；
If so, described RGB ratio is defined as white balance calibration parameter.
A kind of white balance calibration gain of parameter device, including:
Eyeball acquisition module, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module, for obtaining the RGB ratio of described eyeball according to described eyeball
Value；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB ratio
Value is defined as white balance calibration parameter.
White balance calibration gain of parameter method and apparatus of the present invention, utilizes Asian eyeball to be usually ash
The principle of color, when eyeball is Lycoperdon polymorphum Vitt, is defined as white balance calibration ginseng by the RGB ratio of eyeball
Number, the most no matter how background environment and light environment change, and utilize this white balance calibration parameter can be accurate
Reduction white balance.
A kind of white balance calibration method, including step:
Obtain the eyeball in image to be calibrated；
The RGB ratio of described eyeball is obtained according to described eyeball；
Determine whether described eyeball is Lycoperdon polymorphum Vitt according to described RGB ratio；
If so, described RGB ratio is defined as white balance calibration parameter；
According to described white balance calibration parameter, described image to be calibrated is carried out white balance calibration.
A kind of white balance calibration device, including:
Eyeball acquisition module, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module, for obtaining the RGB ratio of described eyeball according to described eyeball
Value；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB ratio
Value is defined as white balance calibration parameter；
White balance calibration module, for carrying out white according to described white balance calibration parameter to described image to be calibrated
Balance calibration.
White balance calibration method and apparatus of the present invention, utilizes Asian eyeball to be usually the principle of Lycoperdon polymorphum Vitt,
When eyeball is Lycoperdon polymorphum Vitt, the RGB ratio of eyeball is defined as white balance calibration parameter, then root
Carrying out white balance calibration according to white balance calibration parameter, the most no matter how background environment and light environment change,
Can accurate reproduction white balance.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of white balance calibration gain of parameter embodiment of the method for the present invention；
Fig. 2 is the structural representation of white balance calibration gain of parameter device embodiment of the present invention；
Fig. 3 is the schematic flow sheet of white balance calibration embodiment of the method for the present invention；
Fig. 4 is the structural representation of white balance calibration device embodiment of the present invention；
Fig. 5 is the structural representation of white balance calibration module embodiments of the present invention.
Detailed description of the invention
By further illustrating the technological means and the effect of acquirement that the present invention taked, below in conjunction with the accompanying drawings and
Preferred embodiment, to technical scheme, carries out clear and complete description.
First the detailed description of the invention of white balance calibration gain of parameter method and apparatus is described in detail.
As it is shown in figure 1, a kind of white balance calibration gain of parameter method, including step:
S110, the eyeball obtained in image to be calibrated；
S120, according to described eyeball obtain described eyeball RGB ratio；
S130, determine according to described RGB ratio whether described eyeball is Lycoperdon polymorphum Vitt；
S140, if so, described RGB ratio is defined as white balance calibration parameter.
The inventive method can realize according to corresponding program, and program operates in the mobile end with camera function
In end, such as mobile phone, Intelligent flat and digital camera etc..Below the implementation process of each step is carried out in detail
Thin introduction.
In step S110 and step S120, open camera, obtain the eyeball of image in camera view picture
Region, wherein identifies that eyeball can realize according to mode existing in prior art.Get eyeball district
Behind territory, calculate the RGB ratio of eyeball.
In step S130 and step S140, Lycoperdon polymorphum Vitt does not has color exactly, and rgb color component is the most equal,
White balance calibration is exactly using neutral ash as reference.
Determine that whether eyeball is that the mode of Lycoperdon polymorphum Vitt has multiple, such as, an enforcement according to RGB ratio
In example, described RGB ratio includes first ratio (R/G) of R and G and second ratio (B/G) of B and G；
Determine that whether described eyeball is that the step of Lycoperdon polymorphum Vitt may include that according to described RGB ratio
If described first ratio is less than first threshold, and described second ratio is less than Second Threshold, it is determined that institute
Stating eyeball is Lycoperdon polymorphum Vitt；
If described first ratio is more than or equal to first threshold, or described second ratio is more than or equal to Second Threshold,
Then determine that described eyeball is not for Lycoperdon polymorphum Vitt.
First threshold and Second Threshold can be set according to actual needs, and both can be different numerical value,
Can also be identical numerical value.If R/G or B/G exceedes corresponding threshold values, then show that eyeball is not
Lycoperdon polymorphum Vitt, it is likely that be the blue eyeball of foreigner, it is also possible to be band coloured spectacles or reflective glasses
Reason, the RGB ratio of this eyeball is not suitable for as white balance calibration parameter.If R/G and B/G is equal
In corresponding threshold range, then show that eyeball is Lycoperdon polymorphum Vitt, i.e. this eyeball is black and white eyeball, then can be used to
Do the foundation of white balance reduction, i.e. the RGB ratio of this eyeball can be as white balance calibration parameter.
It should be noted that user can also set the Rule of judgment of other ratio and correspondence thereof as required,
Such as arrange threshold value corresponding for G/B with R/B etc., this is not made restriction by the present invention.
After obtaining white balance calibration parameter, it is possible to use existing white balance calibration method in prior art to enter
Row white balance calibration, owing to the present invention RGB ratio using eyeball as Lycoperdon polymorphum Vitt is as white balance calibration parameter,
Do not affected by ambient light and background, even if so mixed light scene or the single object of color occur, it is possible to
Image to be carried out correct white balance reduction.
Based on same inventive concept, the present invention also provides for a kind of white balance calibration gain of parameter device, below knot
Close accompanying drawing the detailed description of the invention of apparatus of the present invention is described in detail.
As in figure 2 it is shown, a kind of white balance calibration gain of parameter device, including:
Eyeball acquisition module 110, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module 120, for obtaining the RGB of described eyeball according to described eyeball
Ratio；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module 130, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module 140, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB
Ratio is defined as white balance calibration parameter.
Apparatus of the present invention can realize according to corresponding chip, and chip is arranged on the mobile end with camera function
In end, such as mobile phone, Intelligent flat and digital camera etc..Below the implementation process of modules is carried out in detail
Thin introduction.
Opening camera, eyeball acquisition module 110 obtains the eyeball of image in camera view picture,
Wherein identify that eyeball can realize according to mode existing in prior art.After getting eyeball,
RGB ratio obtains module 120 and calculates the RGB ratio of eyeball.
According to RGB ratio, Lycoperdon polymorphum Vitt detection module 130 determines that whether eyeball is that Lycoperdon polymorphum Vitt mode has multiple, example
As, in one embodiment, described RGB ratio includes the first ratio (R/G) and B and G of R and G
The second ratio (B/G), described Lycoperdon polymorphum Vitt detection module 130 at described first ratio less than first threshold, and
When described second ratio is less than Second Threshold, determine that described eyeball is Lycoperdon polymorphum Vitt；Big at described first ratio
In equal to first threshold, or described second ratio more than or equal to Second Threshold time, determine described eyeball
It it is not Lycoperdon polymorphum Vitt.
First threshold and Second Threshold can be set according to actual needs, and both can be different numerical value,
Can also be identical numerical value.If R/G or B/G exceedes corresponding threshold values, then show that eyeball is not
Lycoperdon polymorphum Vitt, the RGB ratio of this eyeball is not suitable for as white balance calibration parameter.If R/G and B/G is equal
In corresponding threshold range, then show that eyeball is Lycoperdon polymorphum Vitt, i.e. this eyeball is black and white eyeball, can be used to do
The foundation of white balance reduction, white balance calibration parameter determination module 140 is then by the RGB ratio of this eyeball
As white balance calibration parameter.
It should be noted that user can also set the Rule of judgment of other ratio and correspondence thereof as required,
Such as arrange threshold value corresponding for G/B with R/B etc., this is not made restriction by the present invention.
After obtaining white balance calibration parameter, it is possible to use existing white balance calibration method in prior art to enter
Row white balance calibration, owing to the present invention RGB ratio using eyeball as Lycoperdon polymorphum Vitt is as white balance calibration parameter,
Do not affected by ambient light and background, even if so mixed light scene or the single object of color occur, it is possible to
Image to be carried out correct white balance reduction.
Below the detailed description of the invention of the white balance calibration method and apparatus of the present invention is described in detail.
As it is shown on figure 3, a kind of white balance calibration method, including step:
S210, the eyeball obtained in image to be calibrated；
S220, according to described eyeball obtain described eyeball RGB ratio；
S230, determine according to described RGB ratio whether described eyeball is Lycoperdon polymorphum Vitt；
S240, if so, described RGB ratio is defined as white balance calibration parameter；
S250, according to described white balance calibration parameter, described image to be calibrated is carried out white balance calibration.
The inventive method can realize according to corresponding program, and program operates in the mobile end with camera function
In end, such as mobile phone, Intelligent flat and digital camera etc..Below the implementation process of each step is carried out in detail
Thin introduction.
In step S210 and step S220, open camera, obtain the eyeball of image in camera view picture
Region, wherein identifies that eyeball can realize according to mode existing in prior art.Get eyeball district
Behind territory, calculate the RGB ratio of eyeball.
In step S230 and step S240, determine that whether eyeball is the side of Lycoperdon polymorphum Vitt according to RGB ratio
Formula has multiple, and such as, in one embodiment, described RGB ratio includes first ratio (R/G) of R and G
The second ratio (B/G) with B and G；
Determine that whether described eyeball is that the step of Lycoperdon polymorphum Vitt may include that according to described RGB ratio
If described first ratio is less than first threshold, and described second ratio is less than Second Threshold, it is determined that institute
Stating eyeball is Lycoperdon polymorphum Vitt；
If described first ratio is more than or equal to first threshold, or described second ratio is more than or equal to Second Threshold,
Then determine that described eyeball is not for Lycoperdon polymorphum Vitt.
First threshold and Second Threshold can be set according to actual needs, and both can be different numerical value,
Can also be identical numerical value.If R/G or B/G exceedes corresponding threshold values, then show that eyeball is not
Lycoperdon polymorphum Vitt, it is likely that be the blue eyeball of foreigner, it is also possible to be band coloured spectacles or reflective glasses
Reason, the RGB ratio of this eyeball is not suitable for as white balance calibration parameter.If R/G and B/G is equal
In corresponding threshold range, then show that eyeball is Lycoperdon polymorphum Vitt, i.e. this eyeball is black and white eyeball, then can be used to
Do the foundation of white balance reduction, i.e. the RGB ratio of this eyeball can be as white balance calibration parameter.
It should be noted that user can also set the Rule of judgment of other ratio and correspondence thereof as required,
Such as arrange threshold value corresponding for G/B with R/B etc., this is not made restriction by the present invention.
In step s 250, after determining white balance calibration parameter, it is possible to carry out white balance calibration.One
In individual embodiment, according to described white balance calibration parameter, described image to be calibrated is carried out the step of white balance calibration
Suddenly may include that
S2501, ratio according to the first predetermined coefficient Yu described first ratio, it is thus achieved that the first gain；
S2502, ratio according to the second predetermined coefficient Yu described second ratio, it is thus achieved that the second gain；
S2503, according to described first gain and described second gain, described image to be calibrated is carried out white balance school
Accurate.
First predetermined coefficient and the second predetermined coefficient are adjustable coefficients, can according to user be actually needed into
Row regulation.Such as, the first predetermined coefficient is K1, and the second predetermined coefficient is K2, and the first ratio is R/G, the
Two ratios are B/G, then the gain of white balance RGB is just: K1*G/R, K2*G/B, puts down in vain according to this
Entire image just can be carried out correct white balance reduction by weighing apparatus gain.
Owing to the present invention RGB ratio using eyeball as Lycoperdon polymorphum Vitt is as white balance calibration parameter, white according to this
Balance calibration parameter carries out white balance adjusting, is not affected by ambient light and background, even if so there is mixed light
Scene or the single object of color, it is also possible to image is carried out correct white balance reduction.
Based on same inventive concept, the present invention also provides for a kind of white balance calibration device, the most right
The detailed description of the invention of apparatus of the present invention is described in detail.
As shown in Figure 4, a kind of white balance calibration device, including:
Eyeball acquisition module 210, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module 220, for obtaining the RGB of described eyeball according to described eyeball
Ratio；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module 230, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module 240, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB
Ratio is defined as white balance calibration parameter；
White balance calibration module 250, for carrying out described image to be calibrated according to described white balance calibration parameter
White balance calibration.
Apparatus of the present invention can realize according to corresponding chip, and chip is arranged on the mobile end with camera function
In end, such as mobile phone, Intelligent flat and digital camera etc..Below the implementation process of modules is carried out in detail
Thin introduction.
Opening camera, eyeball acquisition module 210 obtains the eyeball of image in camera view picture,
Wherein identify that eyeball can realize according to mode existing in prior art.After getting eyeball,
RGB ratio obtains module 220 and calculates the RGB ratio of eyeball.
According to RGB ratio, Lycoperdon polymorphum Vitt detection module 230 determines that whether eyeball is that the mode of Lycoperdon polymorphum Vitt has multiple,
Such as, in one embodiment, described RGB ratio include first ratio (R/G) of R and G and B and
Second ratio (B/G) of G, described Lycoperdon polymorphum Vitt detection module 230 is less than first threshold at described first ratio,
And described second ratio less than Second Threshold time, determine that described eyeball is Lycoperdon polymorphum Vitt；At described first ratio
More than or equal to first threshold, or when described second ratio is more than or equal to Second Threshold, determine described eyeball district
Territory is not Lycoperdon polymorphum Vitt.
First threshold and Second Threshold can be set according to actual needs, and both can be different numerical value,
Can also be identical numerical value.If R/G or B/G exceedes corresponding threshold values, then show that eyeball is not
Lycoperdon polymorphum Vitt, the RGB ratio of this eyeball is not suitable for as white balance calibration parameter.If R/G and B/G is equal
In corresponding threshold range, then show that eyeball is Lycoperdon polymorphum Vitt, i.e. this eyeball is black and white eyeball, can be used to do
The foundation of white balance reduction, white balance calibration parameter determination module 240 is then by the RGB ratio of this eyeball
As white balance calibration parameter.
It should be noted that user can also set the Rule of judgment of other ratio and correspondence thereof as required,
Such as arrange threshold value corresponding for G/B with R/B etc., this is not made restriction by the present invention.
After determining white balance calibration parameter, white balance calibration module 250 can be carried out white balance calibration.
In one embodiment, as it is shown in figure 5, described white balance calibration module 250 may include that
First gain obtains unit 2501, for the ratio according to the first predetermined coefficient Yu described first ratio,
Obtain the first gain；
Second gain obtains unit 2502, for the ratio according to the second predetermined coefficient Yu described second ratio,
Obtain the second gain；
White balance calibration unit 2503, for treating school according to described first gain and described second gain to described
Quasi-image carries out white balance calibration.
Wherein, the first predetermined coefficient and the second predetermined coefficient are adjustable coefficients, can be according to the reality of user
Needs are adjusted.
Owing to the present invention RGB ratio using eyeball as Lycoperdon polymorphum Vitt is as white balance calibration parameter, white according to this
Balance calibration parameter carries out white balance adjusting, is not affected by ambient light and background, even if so there is mixed light
Scene or the single object of color, it is also possible to image is carried out correct white balance reduction.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right
The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills
There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But can not therefore be construed as limiting the scope of the patent.It should be pointed out that, for this area
For those of ordinary skill, without departing from the inventive concept of the premise, it is also possible to make some deformation and change
Entering, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended power
Profit requires to be as the criterion.
Claims (10)
1. a white balance calibration gain of parameter method, it is characterised in that include step:
Obtain the eyeball in image to be calibrated；
The RGB ratio of described eyeball is obtained according to described eyeball；
Determine whether described eyeball is Lycoperdon polymorphum Vitt according to described RGB ratio；
If so, described RGB ratio is defined as white balance calibration parameter.
White balance calibration gain of parameter method the most according to claim 1, it is characterised in that described RGB
Ratio includes first ratio of R and G and second ratio of B and G；
Determine that whether described eyeball is that the step of Lycoperdon polymorphum Vitt includes according to described RGB ratio:
If described first ratio is less than first threshold, and described second ratio is less than Second Threshold, it is determined that institute
Stating eyeball is Lycoperdon polymorphum Vitt；
If described first ratio is more than or equal to first threshold, or described second ratio is more than or equal to Second Threshold,
Then determine that described eyeball is not for Lycoperdon polymorphum Vitt.
3. a white balance calibration method, it is characterised in that include step:
Obtain the eyeball in image to be calibrated；
The RGB ratio of described eyeball is obtained according to described eyeball；
Determine whether described eyeball is Lycoperdon polymorphum Vitt according to described RGB ratio；
If so, described RGB ratio is defined as white balance calibration parameter；
According to described white balance calibration parameter, described image to be calibrated is carried out white balance calibration.
White balance calibration method the most according to claim 3, it is characterised in that described RGB ratio
The first ratio and second ratio of B and G including R and G；
Determine that whether described eyeball is that the step of Lycoperdon polymorphum Vitt includes according to described RGB ratio:
If described first ratio is less than first threshold, and described second ratio is less than Second Threshold, it is determined that institute
Stating eyeball is Lycoperdon polymorphum Vitt；
If described first ratio is more than or equal to first threshold, or described second ratio is more than or equal to Second Threshold,
Then determine that described eyeball is not for Lycoperdon polymorphum Vitt.
White balance calibration method the most according to claim 4, it is characterised in that according to described white balance
The step that calibration parameter carries out white balance calibration to described image to be calibrated includes:
Ratio according to the first predetermined coefficient Yu described first ratio, it is thus achieved that the first gain；
Ratio according to the second predetermined coefficient Yu described second ratio, it is thus achieved that the second gain；
According to described first gain and described second gain, described image to be calibrated is carried out white balance calibration.
6. a white balance calibration gain of parameter device, it is characterised in that including:
Eyeball acquisition module, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module, for obtaining the RGB ratio of described eyeball according to described eyeball
Value；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB ratio
Value is defined as white balance calibration parameter.
White balance calibration gain of parameter device the most according to claim 6, it is characterised in that described RGB
Ratio includes first ratio of R and G and second ratio of B and G；
Described Lycoperdon polymorphum Vitt detection module is at described first ratio less than first threshold, and described second ratio is less than the
During two threshold values, determine that described eyeball is Lycoperdon polymorphum Vitt；At described first ratio more than or equal to first threshold, or
When second ratio described in person is more than or equal to Second Threshold, determine that described eyeball is not for Lycoperdon polymorphum Vitt.
8. a white balance calibration device, it is characterised in that including:
Eyeball acquisition module, for obtaining the eyeball in image to be calibrated；
RGB ratio obtains module, for obtaining the RGB ratio of described eyeball according to described eyeball
Value；
According to described RGB ratio, Lycoperdon polymorphum Vitt detection module, for determining whether described eyeball is Lycoperdon polymorphum Vitt；
White balance calibration parameter determination module, for when described eyeball is Lycoperdon polymorphum Vitt, by described RGB ratio
Value is defined as white balance calibration parameter；
White balance calibration module, for carrying out white according to described white balance calibration parameter to described image to be calibrated
Balance calibration.
White balance calibration device the most according to claim 8, it is characterised in that described RGB ratio
The first ratio and second ratio of B and G including R and G；
Described Lycoperdon polymorphum Vitt detection module is at described first ratio less than first threshold, and described second ratio is less than the
During two threshold values, determine that described eyeball is Lycoperdon polymorphum Vitt；At described first ratio more than or equal to first threshold, or
When second ratio described in person is more than or equal to Second Threshold, determine that described eyeball is not for Lycoperdon polymorphum Vitt.
White balance calibration device the most according to claim 9, it is characterised in that described white balance school
Quasi-mode block includes:
First gain obtains unit, for the ratio according to the first predetermined coefficient Yu described first ratio, it is thus achieved that
First gain；
Second gain obtains unit, for the ratio according to the second predetermined coefficient Yu described second ratio, it is thus achieved that
Second gain；
White balance calibration unit, for according to described first gain and described second gain to described figure to be calibrated
As carrying out white balance calibration.
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