CN107483908A - White balance calibration method and electronic equipment - Google Patents
White balance calibration method and electronic equipment Download PDFInfo
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- CN107483908A CN107483908A CN201710890224.8A CN201710890224A CN107483908A CN 107483908 A CN107483908 A CN 107483908A CN 201710890224 A CN201710890224 A CN 201710890224A CN 107483908 A CN107483908 A CN 107483908A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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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
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
Abstract
The embodiment of the present invention, which provides a kind of white balance calibration method and electronic equipment, this method, to be included：The colour temperature weight coefficient of multiple light sources is determined according to ambient brightness during shooting image.Piecemeal processing is carried out to image, the actual color ratio of each image block after piecemeal processing is calculated, determines which light source each image block should correspond to according to the reference color ratio of the actual color ratio of image block and each light source.According to each self-corresponding image block quantity of multiple light sources and colour temperature weight coefficient, the respective score of multiple light sources, the higher closer colour temperature with such a light source of colour temperature for meaning that photo environment of score are determined respectively.The color of each pixel in image is calibrated according to the reference color ratio of the light source of highest scoring, to realize the white balance calibration of image.Using the present invention program, light source corresponding during shooting image can be accurately determined according to brightness, is also not in that light source determines mistake, so as to improve picture quality when occurring large area monochrome in the picture.
Description
Technical field
The present invention relates to technical field of image processing, more particularly to a kind of white balance calibration method and electronic equipment.
Background technology
Many people can have found when being taken pictures using photographing device：In photo the color of object can because photo environment difference and
Change is produced, will be partially yellow for example, shooting the object come under tungsten light indoors, daylight shaded side out of doors is shot
The object come will be partially blue.
Different light sources has different spectral components and distribution, and this is referred to as colour temperature in colorimetry, and colour temperature is color
Definition, with K (kelvin) for unit.In real life, whether under fine day, cloudy day, indoor incandescent lamp or fluorescent lamp, Ren Mensuo
The white object seen is always white, and this is often based on white balance calibration realization.White balance is sought to different-colour
Caused aberration is corrected, so that really white is presented in the object of white.
Based on the white balance calibration method of gray world algorithm because its have the advantages that to calculate simple, calibration effect it is good by
Extensive use.But the method also has certain use limitation：When color information is not enriched in the photo of shooting, such as occur big
During area monochrome object, such a method can not then carry out white balance calibration exactly, so as to cause the quality of photo to reduce.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of white balance calibration method and electronic equipment, using ambient brightness with
And colour temperature weight coefficient corresponding with brightness carries out white balance calibration to photo, to improve photographic quality.
The embodiment of the present invention provides a kind of white balance calibration method, including：
The respective colour temperature weight coefficient of multiple light sources is determined according to ambient brightness during shooting image；
Face is referred to according to the respective actual color ratio of multiple images block in described image and the multiple light source are respective
Color ratio value, determines each self-corresponding light source of the multiple image block, and the multiple image block is to carry out piecemeal to described image to obtain
Arrive；
According to each self-corresponding image block quantity of the multiple light source and colour temperature weight coefficient, determine that the multiple light source is each
From score；
White balance calibration is carried out to described image according to the reference color ratio of the light source of highest scoring.
Alternatively, the ambient brightness according to during shooting image determines the respective colour temperature weight coefficient of multiple light sources, bag
Include：
According to appearance possibility of the respective colour temperature of the multiple light source under the ambient brightness, the multiple light is determined
The respective colour temperature weight coefficient in source.
Alternatively, the appearance possibility according to the respective colour temperature of the multiple light source under the ambient brightness, really
The fixed the multiple respective colour temperature weight coefficient of light source, including：
It is determined that the colour temperature for being not under the ambient brightness；
It is determined that the colour temperature weight coefficient of the light source corresponding to the colour temperature for being not in is 0, the color of remaining light sources is determined
Warm weight coefficient is the preset value more than 0.
Alternatively, it is described each according to the respective actual color ratio of multiple images block in described image and the multiple light source
From reference color ratio, before determining each self-corresponding light source of the multiple image block, in addition to：
The respective reference color ratio of the multiple light source is marked in colour temperature coordinate system；
The respective reference color ratio of the multiple light source is fitted, to obtain colour temperature curve.
Alternatively, it is described each according to the respective actual color ratio of multiple images block in described image and the multiple light source
From reference color ratio, determine each self-corresponding light source of the multiple image block, including：
For any image block in the multiple image block, the actual color ratio for calculating any image block is distinguished
With the distance between the respective reference color ratio of the multiple light source；
It is determined that the light source corresponding to minimum range is light source corresponding to any image block.
Alternatively, the multiple respective reference color ratio of light source of fitting, after obtaining colour temperature curve, is also wrapped
Include：
For any point (x, y) on the colour temperature curve, respectively along the change in coordinate axis direction of the colour temperature coordinate system, it is determined that
The coordinate points that distance apart from any point (x, y) is preset value w：(x-w, y), (x+w, y), (x, y-w) and (x, y+w)；
It is determined that pass through 4 straight lines of the coordinate points, X=x-w, X=x+w, Y=y-w, Y=y+w, with by described 4 respectively
Bar straight line surrounds colour temperature band corresponding to described and any point (x, y)；
Colour temperature band obtains color corresponding with the colour temperature curve according to corresponding on the colour temperature curve with any point (x, y)
Temperate zone.
Alternatively, the actual color ratio for calculating any image block respectively with the respective ginseng of the multiple light source
The distance between color ratio is examined, including：
If the actual color ratio of any image block is located within the colour temperature band, any image block is calculated
The actual color ratio distance between the respective reference color ratio of the multiple light source respectively.
Alternatively, it is described each according to the respective actual color ratio of multiple images block in described image and the multiple light source
From reference color ratio, before determining each self-corresponding light source of the multiple image block, in addition to：
Any image block being directed to respectively in the multiple image block, calculates each pixel in any image block
The first ratio and the second ratio of the 3rd color value and the second color value of first color value and the second color value；
The actual color ratio for determining any image block is：First ratio of whole pixels in any image block
The average value of second ratio of whole pixels in the average value of value, and any image block.
Alternatively, it is described each according to the respective actual color ratio of multiple images block in described image and the multiple light source
From reference color ratio, before determining each self-corresponding light source of the multiple image block, in addition to：
Any light source being directed to respectively in the multiple light source, obtains the grey card graphic clapped under any light source；
Choose the reference zone of the default size of the gray card picture centre；
Calculate the first color value of whole pixels in the reference zone and, the second color value and and the 3rd face
The sum of colour；
The reference color ratio for determining any light source is：It is first color value and with second color value
3rd ratio of sum, and the 3rd color value and it is with second color value and the 4th ratio.
The embodiment of the present invention provides a kind of electronic equipment, including：Memory, and the processing being connected with the memory
Device；
The memory, for storing one or more computer instruction, wherein, one or more computer instruction
Call and perform for the processor；
The processor, for performing one or more computer instruction with appointing in above-mentioned white balance calibration method
Anticipate a kind of method.
White balance calibration method provided in an embodiment of the present invention and electronic equipment, photographing device is according to ring during shooting image
Border brightness determines the colour temperature weight coefficient of the multiple light sources pre-set corresponding with this ambient brightness.Image to photographing again
Piecemeal processing is carried out to obtain multiple images block, the actual color ratio of each image block is calculated, according to the actual face of image block
The reference color ratio of color ratio value and each light source determines which light source each image block should correspond to.Respectively statistics with
The number of image block corresponding to each light source, for a light source, can according to this light source correspondence image block number with
And colour temperature weight coefficient determines the score of this light source corresponding to the light source under the ambient brightness of shooting image.Repeat above-mentioned
" calculating score " process can respectively obtain score corresponding to each light source.And the higher colour temperature for meaning that photo environment of score
The closer colour temperature with such a light source.Finally, can be calibrated according to the reference color ratio of the light source of highest scoring in image
The color of each pixel, to realize the white balance calibration of image.It can be seen that the present invention is according to ambient brightness during shooting image
Light source corresponding with shooting environmental is determined, recycles the reference color value of this light source to carry out white balance calibration.Go out in the picture
During existing large area monochrome, light source corresponding during shooting image also can be accurately determined according to brightness, and then carry out white balance
Calibration, is not in determine the light source to make mistake because color of image is single, so as to cause the situation of white balance calibration mistake, carries
High image quality.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow chart of white balance calibration embodiment of the method one provided in an embodiment of the present invention；
Fig. 2 is the flow chart of white balance calibration embodiment of the method two provided in an embodiment of the present invention；
Fig. 3 is the flow chart of white balance calibration embodiment of the method three provided in an embodiment of the present invention；
Fig. 4 is the structural representation of electronic equipment embodiment one provided in an embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The term used in embodiments of the present invention is only merely for the purpose of description specific embodiment, and is not intended to be limiting
The present invention." one kind ", " described " and "the" of singulative used in the embodiment of the present invention and appended claims
It is also intended to including most forms, unless context clearly shows that other implications, " a variety of " generally comprise at least two, but not
Exclusion includes at least one situation.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, represent
There may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while A and B be present, individualism B these three
Situation.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
It will be appreciated that though XXX may be described using term first, second, third, etc. in embodiments of the present invention, but
These XXX should not necessarily be limited by these terms.These terms are only used for XXX being distinguished from each other out.For example, implementation of the present invention is not being departed from
In the case of example scope, the first XXX can also be referred to as the 2nd XXX, and similarly, the 2nd XXX can also be referred to as the first XXX.
Depending on linguistic context, word as used in this " if ", " if " can be construed to " ... when " or
" when ... " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " such as
Fruit detects (condition or event of statement) " can be construed to " when it is determined that when " or " in response to determine " or " when detection (statement
Condition or event) when " or " in response to detect (condition or event of statement) ".
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising, so that commodity or system including a series of elements not only include those key elements, but also including without clear and definite
The other element listed, or also include for this commodity or the intrinsic key element of system.In the feelings not limited more
Under condition, the key element that is limited by sentence "including a ...", it is not excluded that in the commodity including the key element or system also
Other identical element be present.
Fig. 1 is the flow chart of white balance calibration embodiment of the method one provided in an embodiment of the present invention, what the present embodiment provided
The executive agent of the white balance calibration method can be photographing device, as shown in figure 1, this method comprises the following steps：
S101, the respective colour temperature weight coefficient of multiple light sources is determined according to ambient brightness during shooting image.
User shoots an image using photographing device under any environment.Alternatively, it is bright in the presence of one in photographing device
Sensor is spent, can be using the brightness value that this luminance sensor detects as ambient brightness during shooting image.Alternatively, may be used also
One average computation is done with the brightness value to each pixel in the image photographed, and using obtained average brightness value as bat
Take the photograph ambient brightness during image.Specifically, the brightness value of each pixel can be according to each pixel respectively in R, G, B tri-
Default transformational relation obtains between color value and color value and brightness value in Color Channel.Further according to each pixel
Brightness value obtains an average brightness value, using this average brightness value as ambient brightness during shooting image.
After obtaining ambient brightness, according to the corresponding relation of default ambient brightness and colour temperature weight coefficient, can obtain with
One group of colour temperature weight coefficient corresponding to ambient brightness during shooting image.Wherein, every group of colour temperature weight coefficient includes multiple colour temperatures
Colour temperature weight coefficient corresponding to scope, colour temperature weight coefficient can be pre-set, alternatively, corresponding to each reference color temperature
Colour temperature weight coefficient is different.In addition, each reference color temperature has a corresponding light source corresponding.Each ambient brightness can be with
Regard as by multiple light sources mixed exposure and caused.Therefore, every group of colour temperature weight coefficient is it can be understood that in a certain environment
Under brightness, the respective colour temperature weight coefficient of various light sources.
For example, multiple reference color temperatures can be 8000K~7000K, 7000K~6000K, 6000K~5000K,
5000K~4000K, 4000K~3500K, 3500K~3000K, 3000K~2500K and it is corresponding with this multiple reference color temperature
Light source can be D75, D65, D50, CWF, U35, F, A successively.Above-mentioned light source is all the common light source of daily life, for example, D75
The light that light source is sent is that the light that simulated solar irradiation, D65 light sources are sent is international standard alpine light, cool white in CWF light sources shop
Light of Guang Wei hotels lamp that light source, F light sources are sent etc..
S102, according to the respective actual color ratio of multiple images block in image and the respective reference color ratio of multiple light sources
Value, determines each self-corresponding light source of multiple images block, and multiple images block carries out piecemeal to image and obtained.
Piecemeal processing is carried out to the image photographed, it is alternatively possible to be divided an image into according to default number default
Number image block；Alternatively, multiple images block can also be divided an image into according to default pixel quantity.
Calculate the actual color ratio of each image block.A kind of alternatively calculation, first, is obtained in a certain image block
Each first color value, second color value and threeth color value of the pixel in three Color Channels, alternatively, the first face
Colour can be the r values under R Color Channels, and the second color value can be the g values under G Color Channels, and the 3rd color value can
To be the b values under B color channel.And the actual color ratio of each pixel can be by the first ratio and the second ratio group
Into, wherein, the first ratio is the color value of the first color value/second, and the second ratio is the color value of the 3rd color value/second.Then,
It is alternatively possible to the first ratio and the second ratio of each pixel in same image block are obtained, respectively by each
The median of the median of one ratio and each second ratio is defined as the actual color ratio of this image block.To each image block
Above-mentioned calculating is all carried out, to obtain the actual color ratio of each image block.
By the actual color ratio of each image block respectively compared with the reference color ratio of each light source, so as to really
The light source corresponding to each image block is made, that is to say and determine that each image block and which light source have same or like color
Temperature.Similar to actual color ratio, the reference color ratio for each light source that described above is related to can be by each light source
The 3rd ratio and the 4th ratio composition, and the 3rd ratio is the color value of the first color value/second, and the 4th ratio is the 3rd face
The color value of colour/second.And the specific acquisition modes of the reference color ratio of each light source may be referred in following embodiments three
Related content.
S103, according to each self-corresponding image block quantity of multiple light sources and colour temperature weight coefficient, determine multiple light sources each
Score.
Statistics and the quantity of each self-corresponding image block of multiple light sources.Obtain it is corresponding with ambient brightness during shooting image
The respective colour temperature weight coefficient of multiple light sources after, for a certain light source, by the colour temperature weight coefficient of this light source with it is corresponding
It is multiplied in the image block number of this light source, so as to obtain the score of this light source.Said process is repeated to obtain obtaining for each light source
Point.Score is more high, shows the closer colour temperature with this light source of colour temperature of environment during shooting image.
S104, white balance calibration is carried out to image according to the reference color ratio of the light source of highest scoring.
Light source corresponding to top score is determined, alternatively, using the reciprocal as white flat of the reference color ratio of this light source
Weigh the gain parameter calibrated, and carries out white balance calibration to each pixel in image according to this gain parameter.Specifically, it is first
First, white balance calibration can be carried out to any pixel point in image in the following ways：Any pixel o'clock is obtained in three face
The first color value, the second color value and the 3rd color value under chrominance channel, by the in the first color value and reference color value
The reciprocal multiplication of three ratios, with the first color value after being calibrated；By the 4th ratio in the 3rd color value and reference color ratio
The reciprocal multiplication of value, with the 3rd color value after being calibrated.
The color value of each pixel in image is calibrated as procedure described above, so as to complete the white of whole image
Balance calibration, and the image photographed is shown according to the color value after calibration.The image now shown is can to reflect thing
Body obtains true colors.
In the present embodiment, photographing device determines corresponding with this ambient brightness advance according to ambient brightness during shooting image
The colour temperature weight coefficient of the multiple light sources of setting.Piecemeal processing is carried out to obtain multiple images block to the image photographed again, counted
The actual color ratio of each image block is calculated, according to the actual color ratio of image block and the reference color ratio of each light source
Determine which light source each image block should correspond to.The number of image block corresponding with each light source is counted respectively, for
For one light source, can according to this light source correspondence image block number and the light source pair under the ambient brightness of shooting image
The colour temperature weight coefficient answered determines the score of this light source.Repeating the process of above-mentioned " calculating score " can respectively obtain often
Score corresponding to individual light source.And the higher closer colour temperature with such a light source of colour temperature for meaning that photo environment of score.Finally, may be used
The color of each pixel in image is calibrated with the reference color ratio of the light source according to highest scoring, to realize the white of image
Balance calibration.It can be seen that the present invention is to determine light source corresponding with shooting environmental, then profit according to ambient brightness during shooting image
White balance calibration is carried out with the reference color value of this light source, even if when occurring large area monochrome in image, also can be according to bright
Degree is accurate to determine light source corresponding during shooting image, and then carries out white balance calibration, is not in because color of image is single
And the light source to make mistake is determined, so as to cause the situation of white balance calibration mistake, improve picture quality.
Fig. 2 is the flow chart of white balance calibration embodiment of the method two provided in an embodiment of the present invention, as shown in Fig. 2 the party
Method comprises the following steps：
S201, according to appearance possibility of the respective colour temperature of multiple light sources under ambient brightness, determine multiple light sources each
Colour temperature weight coefficient.
Photographing device after shooting image, can obtain under a certain ambient brightness according to the associated description in previous embodiment one
Take the ambient brightness of image.Then, it is alternatively possible to according to recording the multiple light sources under varying environment brightness in configuration file
The possibility and the respective colour temperature weight system of multiple light sources under varying environment brightness whether respective reference color temperature occurs
Number, determine under this ambient brightness the respective reference color temperature of multiple light sources occur possibility and under this ambient brightness it is multiple
The respective colour temperature weight coefficient of light source.
Alternatively, above-mentioned configuration file can generate in the following manner.
Understood after carrying out analytic statistics to the lot of experimental data being obtained ahead of time：Ambient brightness to a certain extent with colour temperature
It is contact be present, this contact can specifically be presented as：Under different ambient brightness, some reference color temperatures have what is occurred
Possibility, some reference color temperatures are without the possibility occurred.Therefore, can occur the difference of possibility according to reference color temperature,
It is arranged on multiple each self-corresponding colour temperature weight coefficients of reference color temperature under varying environment brightness.Because each reference color temperature is corresponding
In a kind of light source, therefore, namely the respective colour temperature weight coefficient of multiple light sources under varying environment brightness is provided in.And colour temperature is weighed
The numerical value of weight coefficient can then characterize the possibility whether respective reference color temperature of multiple light sources occurs under varying environment brightness
Property.Finally, the possibility that whether is occurred under varying environment brightness of the record respective reference color temperature of multiple light sources and not
With the respective colour temperature weight coefficient of multiple light sources under ambient brightness, so as to generate configuration file.
Alternatively, the respective colour temperature weight coefficient of multiple light sources corresponding to any environment brightness can enter in the following ways
Row is set.
First, it is determined that the colour temperature for being not under ambient brightness.
And then it is determined that the colour temperature weight coefficient of light source corresponding to the colour temperature for being not in is 0, determine the color of remaining light sources
Warm weight coefficient is the preset value more than 0.
Specifically, according to substantial amounts of experimental data, count the reference color temperature that is not under every kind of ambient brightness with
And the remaining reference color temperature for being possible to occur.For example, accept in embodiment one the multiple color temperatures scope that provides and with it is more
Various light sources corresponding to kind reference color temperature, in the case where ambient brightness is higher, the reference color temperature for being typically not in is 3000K
~2500K, at this point it is possible to the colour temperature weight coefficient of this reference color temperature is arranged into 0, that is to say by this reference color temperature 3000K~
The colour temperature weight coefficient of light source A corresponding to 2500K is arranged to 0.Meanwhile by remaining reference color temperature 8000K~7000K, 7000K
The color of each self-corresponding light sources of~6000K, 6000K~5000K, 5000K~4000K, 4000K~3500K, 3500K~3000K
Warm weight coefficient is arranged to any preset value more than 0.
And for the colour temperature weight coefficient of each self-corresponding light source of remaining reference color temperature, a kind of alternatively mode, it can incite somebody to action
The colour temperature weight coefficient of remaining each self-corresponding light source of reference color temperature is both configured to an identical preset value.Another kind is alternatively
Mode, the colour temperature weight coefficient that can also be possible to each self-corresponding light source of reference color temperature to residue according to following principle are set
Put：The colour temperature weight coefficient that will appear from light source corresponding to the higher reference color temperature of possibility is arranged to a larger value, such as 6
Or 7, the colour temperature weight coefficient that will appear from light source corresponding to the relatively low reference color temperature of possibility is arranged to a less value, such as
1 or 2.And the height of the possibility of every kind of reference color temperature for being possible to occur can also equally count according to lot of experimental data
Arrive.
S202, respectively for any image block in multiple images block, calculate the of each pixel in any image block
The first ratio and the second ratio of the 3rd color value and the second color value of one color value and the second color value.
S203, the actual color ratio for determining any image block are：First ratio of whole pixels in any image block
Average value, and in any image block the second ratio of whole pixels average value.
Piecemeal processing is carried out to the image photographed, the concrete mode of piecemeal processing may be referred to the correlation in embodiment one
Description, will not be repeated here.Identical with associated description in the step S102 of embodiment one, each pixel has the first face in image
Colour, the second color value and the 3rd color value, the first ratio and the second ratio of each pixel are calculated respectively, its
In, the first ratio is the color value of the first color value/second, and the second ratio is the color value of the 3rd color value/second.
Then, the first ratio of each pixel in same image block is carried out seeking median calculation, to obtain
The average value of one ratio；Similarly, the second ratio is carried out seeking median calculation, to obtain the average value of the second ratio.By corresponding
The actual color ratio of this image block is formed in the average value of the first ratio of same image block and the average value of the second ratio.
Can be to determine the actual color ratio of any image block according to said process.
S204, for any image block in multiple images block, calculate the actual color ratio of any image block respectively with
Distance between the respective reference color ratio of multiple light sources.
S205, it is determined that the light source corresponding to minimum range is light source corresponding to any image block.
It is alternatively possible to actual color ratio and reference color ratio are labeled in a colour temperature coordinate system, this color
The abscissa of warm coordinate system is the color value of the first color value/second, and ordinate is the color value of the 3rd color value/second.Therefore, often
The respective reference color ratio of actual color ratio and multiple light sources of individual image block may be expressed as one in coordinate system
Individual coordinate points.
Then, actual color ratio and the respective reference of multiple light sources of any image block are calculated respectively using range formula
Distance between color ratio.A light source corresponding to minimum range is determined according to multiple distance values, and this light source is determined
For light source corresponding to this any image block, it is same or like to that is to say that this any image block of expression has with the light source determined
Colour temperature.
S206, according to each self-corresponding image block quantity of multiple light sources and colour temperature weight coefficient, determine multiple light sources each
Score.
S207, white balance calibration is carried out to image according to the reference color ratio of the light source of highest scoring.
Above-mentioned steps S206-S207 implementation procedure is similar to the corresponding steps of previous embodiment, may refer to such as Fig. 1 institutes
Show the associated description in embodiment, or else repeat herein.
It should be noted that taking pictures in reality, due to the influences of many reasons such as ambient noise or capture apparatus,
Some abnormal image blocks are likely that there are in the image that can to photograph.If these abnormal image blocks not filtered out,
Then probably influence whether the accuracy of final image white balance calibration.Therefore, in order to further improve white balance calibration
Accuracy, alternatively, before step S202 is performed, the white balance calibration method can perform following steps：
Judge that the actual color ratio of any image block whether within colour temperature band, if within colour temperature band, is held
Row above-mentioned steps S204.
When image block is not in colour temperature band, then it is abnormal image block to show this image block, is directly ignored.When image block position
In in colour temperature band, then showing that this image block is normal picture block, further subsequently calculated.Pass through above-mentioned deterministic process
To filter out the abnormal image block in image, so as to improve the accuracy of white balance calibration.Wherein, colour temperature band is according to colour temperature curve
What extension obtained, the forming process of colour temperature curve and colour temperature band may be referred to the related content in following embodiments three.
In the present embodiment, after the ambient brightness when obtaining shooting image, it can know not homochromy under this ambient brightness
Colour temperature weight parameter corresponding to the possibility and different-colour scope that warm scope occurs, and colour temperature weight coefficient is according to colour temperature
What the possibility that scope occurs was configured, and colour temperature weight coefficient corresponding to the reference color temperature that would be impossible to occur is arranged to
0.Because each reference color temperature corresponds to a kind of light source, therefore it that is to say light source corresponding to the reference color temperature that would be impossible to occur
Colour temperature weight coefficient is arranged to 0, so when it is determined that carrying out white balance calibration with the reference color ratio of which kind of light source, can keep away
Exempt from the interference for the light source that colour temperature weight coefficient is 0, so as to carry out white balance calibration to image exactly, improve image matter
Amount.In addition, before it is determined which light source image block in image correspond to, can also one be carried out to image block and filter out processing,
So as to filter out abnormal image block, to ensure that the image block for being used to calculate light source score is all normal, obtained so as to improve light source
Divide the accuracy calculated, also just correspondingly improve the accuracy of white balance calibration.
It can be seen from the associated description of above-described embodiment, during white balance calibration is carried out, except multiple light sources are each
From colour temperature weight coefficient outside, it is also necessary to using the respective reference color ratio of multiple light sources, colour temperature curve and according to colour temperature
The colour temperature band that curve obtains.Fig. 3 be white balance calibration embodiment of the method three provided in an embodiment of the present invention flow chart, such as Fig. 3
It is shown, in step " according to the respective actual color ratio of multiple images block in image and the respective reference color ratio of multiple light sources
Value, determines each self-corresponding light source of multiple images block " before, this method comprises the following steps：
S301, the respective reference color ratio of multiple light sources is marked in colour temperature coordinate system.
S302, the respective reference color ratio of multiple light sources is fitted, to obtain colour temperature curve.
The respective reference color ratio of multiple light sources is labeled in colour temperature coordinate system so that the reference color of each light source
Ratio is referred to as a coordinate points in colour temperature coordinate system.Carried out curve fitting using this multiple coordinate points to form a colour temperature song
Line.It is readily appreciated that, the number of light source is more, obtains the accuracy for the colour temperature curve that reference color ratio is more, then fits
It is higher.And the complexity of light source acquisition is considered in practical application and repeats the reasons such as the number of experiment, alternatively, light source
Number can be 8.
S303, for any point (x, y) on colour temperature curve, respectively along the change in coordinate axis direction of colour temperature coordinate system, it is determined that away from
Leave one's post a bit (x, y) distance be preset value w coordinate points：(x-w, y), (x+w, y), (x, y-w) and (x, y+w).
S304, it is determined that passing through 4 straight lines of coordinate points, X=x-w, X=x+w, Y=y-w, Y=y+w, with by 4 respectively
Straight line surround with any point (x, y) corresponding to colour temperature band.
S305, colour temperature band obtains colour temperature corresponding with colour temperature curve according to corresponding on colour temperature curve with any point (x, y)
Band.
For any point (x, y) on colour temperature curve, it may be determined that go out in this coordinate system with this any point (x, y)
Vertical range is preset value w 4 coordinate points, i.e., (x-w, y), (x+w, y), (x, y-w) and (x, y+w).According to this 4 coordinates
Point can determine 44 straight line X=x-w perpendicular to reference axis, X=x+w, Y=y-w, Y=y+w.Can be straight by this 4
Line forms a rectangular area, and the center of this rectangular area is this any point (x, y).This region formed is then this
Some colour temperature band corresponding to (x, y).
The colour temperature band as corresponding to every bit on colour temperature curve collectively constitutes colour temperature band corresponding to whole piece colour temperature curve again.And this
Colour temperature band can be understood as an extension to colour temperature curve.
The border of the colour temperature band generated according to the method described above is typically a zigzag, and in actual applications, alternatively,
The border of colour temperature band can also be smoothed, to obtain the colour temperature band of an edge smoothing.Specifically, line can be used
Property smoothing algorithm, such as gaussian filtering method, or nonlinear smoothing algorithm, such as median filtering method.
Alternatively, the respective reference color ratio of multiple light sources being related in step S301 can be counted in the following manner
Obtain.
First, respectively for any light source in multiple light sources, obtain the grey card graphic clapped under any light source.
Second, choose the reference zone of the default size of gray card picture centre.
3rd, calculate reference zone in whole pixels the first color value and, the second color value and the and the 3rd
The sum of color value.
4th, the reference color ratio for determining any light source is：It is first color value and with the second color value and
Three ratios, and the 3rd color value and it is with the second color value and the 4th ratio.
Specifically, put together gray card is overlapping with jobbie, then an optional light source from multiple light sources, and
A grey card graphic is clapped to obtain using photographing device under this light source, contains gray card and object simultaneously in this grey card graphic.From what is clapped
A reference zone of the default size centered on grey card graphic is selected in grey card graphic, subsequent optical is carried out using this region
The determination of source reference color ratio.Alternatively, the area in grey card graphic shared by gray card can be more than or equal to 50%, and in reality
In the application of border, it is alternatively possible to which the reference zone of default size to be arranged to a quarter region of gray card picture centre.
It is calculated according to the first color value of all pixels point, the second color value and the 3rd color value in reference zone
In this reference zone the first color value of all pixels point and, the second color value and and the 3rd color value sum.By first
Color value and the/the second color value and be used as the 3rd ratio, using the 3rd color value and the/the second color value and as the 4th
Ratio, the reference color ratio of such a light source is finally made up of the 3rd ratio and the 4th ratio.The weight under different light sources respectively
Aforesaid operations are carried out again can obtain the respective reference color ratio of various light sources.
In the present embodiment, a grey card graphic corresponding to every kind of light source is shot, according to the reference zone positioned at grey card graphic
The color value of interior pixel calculates the reference color ratio of every kind of light source.This reference color ratio is labeled in colour temperature coordinate
In system, to obtain colour temperature curve.And then an extension process is carried out to any point on this colour temperature curve, and most color temperature at last
Curve extension is a colour temperature band.This colour temperature band can be realized during white balance calibration is carried out to image filters out Abnormal Map
As the effect of block, so as to accurately determine the parameter for white balance calibration, so as to carry out carrying out accurate school to image
Standard, improve picture quality.
Fig. 4 is the structural representation of electronic equipment embodiment one provided in an embodiment of the present invention, as shown in figure 4, the electronics
Equipment includes：Memory 11, and the processor 12 being connected with memory, memory 11 are above-mentioned for storing electronic equipment execution
The program of the white balance calibration method provided in any embodiment, processor 12 are configurable for performing and stored in memory 11
Program.
Program includes one or more computer instruction, wherein, one or more computer instruction is performed by processor 12
When can realize following steps：
The respective colour temperature weight coefficient of multiple light sources is determined according to ambient brightness during shooting image；
According to the respective actual color ratio of multiple images block in image and the respective reference color ratio of multiple light sources, really
Determine each self-corresponding light source of multiple images block, multiple images block carries out piecemeal to image and divides to obtain；
According to each self-corresponding image block quantity of multiple light sources and colour temperature weight coefficient, determine that multiple light sources are respective and obtain
Point；
Blank level adjustment is carried out to image according to the reference color ratio of the light source of highest scoring.
Alternatively, processor 12 is additionally operable to perform all or part of step in aforementioned approaches method step.
Wherein, communication interface 13 can also be included in the structure of electronic equipment, for electronic equipment and other equipment or logical
Communication network communicates.
Device embodiment described above is only schematical, wherein the unit illustrated as separating component can
To be or may not be physically separate, it can be as the part that unit is shown or may not be physics list
Member, you can with positioned at a place, or can also be distributed on multiple NEs.It can be selected according to the actual needs
In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Work in the case of, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
Realized by the mode of general hardware platform necessary to add, naturally it is also possible to come real by way of hardware and software combination
It is existing.Based on such understanding, the part that above-mentioned technical proposal substantially contributes to prior art in other words can be with product
Form embody, the computer product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD
Deng, including some instructions are causing a computer installation (can be personal computer, server, or network equipment etc.)
Perform the method described in some parts of each embodiment or embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
- A kind of 1. white balance calibration method, it is characterised in that including：The respective colour temperature weight coefficient of multiple light sources is determined according to ambient brightness during shooting image；According to the respective actual color ratio of multiple images block in described image and the respective reference color ratio of the multiple light source Value, determines each self-corresponding light source of the multiple image block, and the multiple image block carries out piecemeal to described image and obtained；According to each self-corresponding image block quantity of the multiple light source and colour temperature weight coefficient, determine that the multiple light source is respective Score；White balance calibration is carried out to described image according to the reference color ratio of the light source of highest scoring.
- 2. according to the method for claim 1, it is characterised in that the ambient brightness according to during shooting image determines multiple The respective colour temperature weight coefficient of light source, including：According to appearance possibility of the respective colour temperature of the multiple light source under the ambient brightness, determine that the multiple light source is each From colour temperature weight coefficient.
- 3. according to the method for claim 2, it is characterised in that it is described according to the respective colour temperature of the multiple light source described Appearance possibility under ambient brightness, the respective colour temperature weight coefficient of the multiple light source is determined, including：It is determined that the colour temperature for being not under the ambient brightness；It is determined that the colour temperature weight coefficient of the light source corresponding to the colour temperature for being not in is 0, the colour temperature power of remaining light sources is determined Weight coefficient is the preset value more than 0.
- 4. according to the method in any one of claims 1 to 3, it is characterised in that described according to multiple figures in described image As the respective actual color ratio of block and the respective reference color ratio of the multiple light source, the multiple image block is determined each Before corresponding light source, in addition to：The respective reference color ratio of the multiple light source is marked in colour temperature coordinate system；The respective reference color ratio of the multiple light source is fitted, to obtain colour temperature curve.
- 5. according to the method for claim 4, it is characterised in that described according to the respective reality of multiple images block in described image Border color ratio and the respective reference color ratio of the multiple light source, determine each self-corresponding light source of the multiple image block, Including：For any image block in the multiple image block, calculate the actual color ratio of any image block respectively with institute State the distance between the respective reference color ratio of multiple light sources；It is determined that the light source corresponding to minimum range is light source corresponding to any image block.
- 6. according to the method for claim 5, it is characterised in that the multiple respective reference color ratio of light source of fitting Value, after obtaining colour temperature curve, in addition to：For any point (x, y) on the colour temperature curve, respectively along the change in coordinate axis direction of the colour temperature coordinate system, it is determined that distance The distance of any point (x, y) is preset value w coordinate points：(x-w, y), (x+w, y), (x, y-w) and (x, y+w)；It is determined that pass through 4 straight lines of the coordinate points, X=x-w, X=x+w, Y=y-w, Y=y+w, with straight by described 4 respectively Line surrounds colour temperature band corresponding to described and any point (x, y)；Colour temperature band obtains colour temperature corresponding with the colour temperature curve according to corresponding on the colour temperature curve with any point (x, y) Band.
- 7. according to the method for claim 6, it is characterised in that the actual color ratio for calculating any image block Distance between the respective reference color ratio of the multiple light source respectively, including：If the actual color ratio of any image block is located within the colour temperature band, the reality of any image block is calculated The border color ratio distance between the respective reference color ratio of the multiple light source respectively.
- 8. according to the method for claim 4, it is characterised in that described according to the respective reality of multiple images block in described image Border color ratio and the respective reference color ratio of the multiple light source, determine each self-corresponding light source of the multiple image block it Before, in addition to：Any image block being directed to respectively in the multiple image block, calculates first of each pixel in any image block The first ratio and the second ratio of the 3rd color value and the second color value of color value and the second color value；The actual color ratio for determining any image block is：First ratio of whole pixels in any image block The average value of second ratio of whole pixels in average value, and any image block.
- 9. according to the method for claim 4, it is characterised in that described according to the respective reality of multiple images block in described image Border color ratio and the respective reference color ratio of the multiple light source, determine each self-corresponding light source of the multiple image block it Before, in addition to：Any light source being directed to respectively in the multiple light source, obtains the grey card graphic clapped under any light source；Choose the reference zone of the default size of the gray card picture centre；Calculate the first color value of whole pixels in the reference zone and, the second color value and and the 3rd color value Sum；The reference color ratio for determining any light source is：It is first color value and with second color value and 3rd ratio, and the 3rd color value and it is with second color value and the 4th ratio.
- 10. a kind of electronic equipment, it is characterised in that including：Memory, and the processor being connected with the memory；The memory, for storing one or more computer instruction, wherein, one or more computer instruction supplies institute State processor and call execution；The processor, for performing one or more computer instruction to realize any one of claim 1-9 Method.
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| CN108063934A (en) * | 2017-12-25 | 2018-05-22 | 广东欧珀移动通信有限公司 | Image processing method and device, computer readable storage medium and computer equipment |
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