CN105611265A - White balance regulation device and white balance regulation method - Google Patents
White balance regulation device and white balance regulation method Download PDFInfo
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- CN105611265A CN105611265A CN201610087189.1A CN201610087189A CN105611265A CN 105611265 A CN105611265 A CN 105611265A CN 201610087189 A CN201610087189 A CN 201610087189A CN 105611265 A CN105611265 A CN 105611265A
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- white balance
- color temperature
- light source
- ratio
- temperature light
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, 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
- 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
Abstract
The invention provides a white balance regulation method, comprising the following steps: acquiring an initial distribution proportion of white balance reference points of each light source under the current environment; detecting an exposure factor of the current environment, and judging type of the current environment; according to the type of the current environment, inquiring a preset weight regulation table to obtain a weight value of each light source of the current environment; and according to the weight value of each light source of the current environment, regulating the initial distribution proportion to obtain a final white balance parameter. According to the device and the method provided by the invention, by means of acquiring the initial distribution proportion of the white balance reference points of each light source under the current environment, further judging the type of the current environment according to the exposure factor of the current environment and inquiring the weight regulation table according to the type of the current environment, the weight value of each light source is obtained. Finally, the initial distribution proportion is regulated according to the weight value of each light source, and the final white balance parameter is obtained, thereby, interference on calculation of the final white balance caused by erroneous judgment to the environment type is eliminated directly, and the aim of optimizing the white balance reference points is achieved.
Description
Technical field
The present invention relates to mobile communication technology field, and be particularly related to a kind of white balance adjustment device and method.
Background technology
White balance (whitebalance) is that camera red, green, blue three primary colours are mixed the weight that generates white accuracyWant index. At present mobile phone camera and single automatic white balance adjustment of instead all supporting, this is for camera white balanceAccuracy, promptness have higher requirement. Affect important factor of white balance and be exactly current environmentColour temperature, for example, represents respectively A, H, TL84, D65, D50 of different color temperature values etc. From cameraThe angle of debugging can be debugged the white balance parameter under different-colour accurately under lamp box, redGain (R-gain), blue gain (B-gain) and green gain (G-gain). Camera also can under lamp boxShow best white balance effect, but in actual environment, unlikely have the pure of similar lamp boxThe scene of pure a kind of colour temperature, for example, the colour temperature of incandescent lamp is in 5200K left and right, and at the debugging enironment of lamp boxUnder, the just testing standard of this colour temperature not, so need to set up the method that white balance self adaptation regulates.
In existing mobile terminal, the calculating of white balance mainly in the following manner: by the image of cameraProcessing unit (ISP) estimates the colour temperature of current environment, is drawn and is regulated in vain by interpolation method according to output colour temperatureThe needed R-GAIN of balance and B-GAIN. Under general environment, this method is to meet white putting downWeighing apparatus calculation requirement, but can exist ISP estimate mistake or with the situation of physical presence deviation (normallyAt two kinds of colour temperature intersections), cause the white balance of actual use to have certain error, cause the entirety of pictureColour cast.
Summary of the invention
The object of the present invention is to provide a kind of white balance adjustment device and method to improve lacking of prior artFall into.
The embodiment of the present invention provides a kind of white balance adjusting method, comprises the following steps:
Step S1: white balance reference point initial that obtains white balance reference point each light source under current environmentDistribution proportion;
Step S2: detect the factor of current environment, judge the type of current environment;
Step S3: according to the type of current environment, inquire about preset weight adjustment form, draw current environmentEach light source weighted value; And
Step S4: according to each light source weighted value of current environment, adjust described initial distribution ratio, drawFinal white balance parameter.
Preferably, before described step S1, also comprise:
According to varying environment type, set up the reference distribution of each light source in environmental form and white balance reference pointMapping relations between ratio, obtain described weight adjustment form.
Preferably, described environmental form comprises outdoor, indoor and dark place.
Preferably, when described environmental form is while being outdoor, in described weight adjustment form, by low color temperature light sourcesRatio be made as 0, improve the ratio of high color temperature light source and reduce in the ratio of color temperature light sources;
When described environmental form is while being indoor, in described weight adjustment form, improve described middle color temperature light sourcesRatio, reduces the ratio of described high color temperature light source and described low color temperature light sources; And
In the time that described environmental form is dark place, in described weight adjustment form, by described high color temperature light source ratioBe made as 0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
Preferably, after setting up described weight adjustment form, user adjusts described weight adjustment form according to interestThe described reference distribution ratio of middle Different Light.
The embodiment of the present invention also provides a kind of white balance adjustment device, comprising:
Image processor, for obtaining the white balance reference of white balance reference point each light source under current environmentThe initial distribution ratio of point;
Environmental form determination module, the factor of detection current environment, the type of judgement current environment;
Ratio mapping block, is connected in described environmental form determination module, for according to the type of current environment,Inquire about preset weight adjustment form, draw each light source weighted value of current environment; And
Computing module, is connected in described image processor and described ratio mapping block, according to current environmentEach light source weighted value, adjusts described initial distribution ratio, draws final white balance parameter.
Preferably, also comprise that weight adjustment form sets up module, be connected in described ratio mapping block, for rootAccording to varying environment type, set up each light source in environmental form and white balance reference point reference distribution ratio itBetween mapping relations, obtain described weight adjustment form.
Preferably, described environmental form comprises outdoor, indoor and dark place.
Preferably, when described environmental form is while being outdoor, in described weight adjustment form, by low color temperature light sourcesRatio be made as 0, improve the ratio of high color temperature light source and reduce in the ratio of color temperature light sources;
When described environmental form is while being indoor, in described weight adjustment form, improve described middle color temperature light sourcesRatio, reduces the ratio of described high color temperature light source and described low color temperature light sources; And
In the time that described environmental form is dark place, in described weight adjustment form, by described high color temperature light source ratioBe made as 0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
By white balance adjusting method and apparatus provided by the invention, utilize image processor to obtain white balance ginsengThe initial distribution ratio of examination point white balance reference point of each light source under current environment, then according to current environmentFactor judge the type of current environment, according to the type inquiry weight adjustment form of current environment, obtainEach light source weighted value. Finally adjust the initial distribution ratio of white balance reference point according to each light source weighted valueExample, draws final white balance parameter, has directly substantially removed thus owing to environmental form being judged by accident to final whiteThe interference of EQUILIBRIUM CALCULATION FOR PROCESS, reaches the object of optimizing white balance reference point. In addition, the weight under varying environment is dividedCloth can user be adjusted voluntarily, meets customization requirement.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to implementingIn example or description of the Prior Art, the accompanying drawing of required use is briefly described, and apparently, the following describesIn accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not payingGo out under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The schematic flow sheet of the white balance adjusting method that Fig. 1 provides for an embodiment of the present invention
The schematic flow sheet of the white balance adjusting method that Fig. 2 provides for another embodiment of the present invention.
It shown in Fig. 3, is the structural representation of the white balance adjustment device that provides of one embodiment of the invention.
Detailed description of the invention
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the invention processAccompanying drawing in example, is clearly and completely described the technical scheme in the embodiment of the present invention, obviously, and instituteThe embodiment describing is only the embodiment of a part of the present invention, instead of whole embodiment. Based on thisEmbodiment in bright, those of ordinary skill in the art are not making the institute obtaining under creative work prerequisiteThere are other embodiment, all should belong to the scope of protection of the invention.
Colour temperature is to characterize the photochromic yardstick of light source, according to the difference of color temperature value, conventionally light source is divided into low colour temperature(color temperature value is more than or equal to 3500K and is less than or equal to for light source (color temperature value is less than 3500K), middle color temperature light sources5000K) and high color temperature light source (color temperature value is greater than 5000K). For example, in common standard sources,D75 (color temperature value is 7500K), D65 (color temperature value is 6500K) are high color temperature light source, D50 (colour temperatureValue is 5000K), TL84 (color temperature value is 4000K) is middle color temperature light sources, A (color temperature value is 2856K),H (color temperature value is 2300K) is low color temperature light sources.
The schematic flow sheet of the white balance adjusting method that Fig. 1 provides for an embodiment of the present invention. White balance sideMethod is for mobile terminal, and mobile terminal includes but not limited to Types Below: mobile phone (English: cellphone),Smart mobile phone (English: smartphone), panel computer (English: tabletcomputer). As shown in Figure 1,White balance adjusting method comprises the following steps:
Step S1: white balance reference point initial that obtains white balance reference point each light source under current environmentDistribution proportion.
Particularly, in one embodiment of this invention, utilize image processor that mobile terminal carries to sensingDevice passes the raw image data of coming and analyzes, and obtains the white balance reference point of each light source under current environmentInitial distribution ratio.
Step S2: detect the factor of current environment, judge the type of current environment.
Preferably, in an embodiment of the present invention, due to the shared ratio difference of each light source under varying environment,Environmental form is divided into outdoor, indoor and dark place.
Step S3: according to the type of current environment, inquire about preset weight adjustment form, draw current environmentEach light source weighted value.
Particularly, in an embodiment of the present invention, the white balance of various light sources under each environment is calculated to weightBe arranged in weight adjustment form. Weight adjustment form has comprised each light source in environmental form and white balance reference pointThe mapping relations of reference distribution ratio. For example, when environmental form is outdoor, high color temperature light source and low colour temperatureThe reference ratio of light source is 10:1.
Step S4: according to each light source weighted value of current environment, adjust described initial distribution ratio, drawFinal white balance parameter.
Particularly, in an embodiment of the present invention, in the current environment that we detect by image processorHave 100 high color temperature light source points, the point of 30 low color temperature light sources, in current environment, high color temperature light source withThe initial distribution ratio of low color temperature light sources is 10:3. Known according to the factor of current environment, current againIn outdoor environment. Inquire about afterwards preset weight adjustment form, in weight adjustment form, in outdoor environmentThe reference ratio of high color temperature light source and low color temperature light sources is 10:1. Go with reference to ratio 10:1 according to this againAdjust initial distribution ratio, finally obtain under current environment in white balance reference point, high color temperature light source withThe distribution proportion of low color temperature light sources is 100:3, thus filtering wrong reference point in white balance optimization meterThe interference of calculating, can obtain good white balance effect of optimization. And in the prior art, be directly that this is initialThe calculating that distribution proportion (being 10:3) is optimized for white balance, the calculating of dialogue balance optimizing brings very largeDisturb.
In another embodiment, also comprise according to varying environment type, set up environmental form and white balance referenceMapping relations in point between the reference distribution ratio of each light source, obtain described weight adjustment form.
In another embodiment, when described environmental form is while being outdoor, in described weight adjustment form, by lowThe ratio of color temperature light sources is made as 0, the ratio of color temperature light sources in the ratio of raising high color temperature light source reduction;
When described environmental form is while being indoor, in described weight adjustment form, improve described middle color temperature light sourcesRatio, reduces the ratio of described high color temperature light source and described low color temperature light sources; And
In the time that described environmental form is dark place, in described weight adjustment form, by described high color temperature light source ratioBe made as 0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
In another embodiment, after setting up described weight adjustment form, user adjusts described weight according to interestThe described reference distribution ratio of Different Light in adjustment form.
White balance adjusting method provided by the invention utilizes image processor to detect each colour temperature under current environmentInitial distribution ratio, then according to the type of the factor judgement current environment of current environment, according to current ringThe type inquiry weight adjustment form in border, obtains colour temperature weighted value. The colour temperature power that last current environment type is correspondingHeavily the initial distribution ratio of value and each colour temperature, draws final white balance parameter, has directly substantially removed thusDue to the interference that erroneous judgement is calculated final white balance to environmental form, reach the object of optimizing white balance reference point
The schematic flow sheet of the white balance adjusting method that Fig. 2 provides for another embodiment of the present invention. As Fig. 2Shown in, white balance adjusting method comprises the following steps:
Step S0: according to varying environment type, set up each light source in environmental form and white balance reference pointMapping relations between reference distribution ratio, obtain described weight adjustment form.
Particularly, in an embodiment of the present invention, described environmental form comprises outdoor, indoor and dark place. RootAccording to the general principle of camera, the exposure parameter in indoor, outdoor, these three environment of dark place is different,Specifically determine according to exposure value, in outdoor environment, exposure parameter is less, in the dark exposure parameter comparisonHeight, exposure parameter can directly react the residing environment of photographer, with the method, directly environment is divided into chamberInterior, outdoor, dark place, build respectively white balance proportioning form for different environment.
Preferably, when environmental form is while being outdoor, in described weight adjustment form, by the ratio of low color temperature light sourcesExample is made as 0, the ratio of color temperature light sources in the ratio of raising high color temperature light source reduction. High in outdoor environmentThe weight of color temperature light sources (for example, these several high color temperature light sources of D75, D65) will inevitably be higher, and lowColor temperature light sources is negligible, for example, outdoor can be D65:D75:A by white balance Table Design:H=10:10:0:0, and when the original method white balance parameter, be the outdoor environment that directly utilizes ISP to gatherThe distribution proportion (for example, original scale is D65:D75:A:H=10:10:2:3) of lower white balance reference point,And by method of the present invention, in calculating, will ignore the weight of low color temperature light sources A, H light source completely, reachTo the optimization of white balance.
Preferably, when the described type of described current environment is while being indoor, in described weight adjustment form, carryThe ratio of high described middle color temperature light sources, reduces the ratio of described high color temperature light source and described low color temperature light sources. ?Under indoor environment, the weight of middle color temperature light sources is higher, but also has possibility (for example, the window of high color temperatureMouthful this approach outdoor environment), in can suitably improving under this environment, color temperature light sources ratio is (for example,D50, TL84), reduce high and low color temperature light sources ratio, for example, by the white balance form under indoor environmentBe designed to D75:D50:TL84:A=5:10:9:2, thus, in final calculating, middle color temperature light sourcesWhite point can whole references, and height colour temperature white point can reduce ratio, reaches the optimization of white balance.
Preferably, in the time that the described type of described current environment is dark place, in described weight adjustment form, willDescribed high color temperature light source ratio is made as 0, improves the ratio of described low color temperature light sources and reduces described middle colour temperature lightThe ratio in source. In the dark, under environment, high color temperature light source ratio can exist hardly, and middle color temperature light sources ratioFew, low color temperature light sources accounts for most proportion, so in the dark under environment, white balance reference table can designFor D75:D50:TL84:A:H=0:2:2:10:10, the reference point of low color temperature light sources will obtain at utmostReservation, the reference point Ignore All of high color temperature light source, middle color temperature light sources reference point can reduce ratio, effectivelyThe reference white dot information of filtering mistake, thereby optimize white balance effect.
Preferably, user can finely tune white balance proportioning form according to the hobby of oneself, as at nightEnvironment under can increase H light ratio example, reach the effect that night scene picture is pale yellow.
Step S1: white balance reference point initial that obtains white balance reference point each light source under current environmentDistribution proportion
Step S2: detect the factor of current environment, judge the type of current environment.
Step S3: according to the type of current environment, inquire about preset weight adjustment form, draw current environmentEach light source weighted value.
Step S4: according to each light source weighted value of current environment, adjust described initial distribution ratio, drawFinal white balance parameter.
In the time using existing method to calculate white balance parameter, if ISP tests out current environment, colour temperature is4500K, in the middle of TL84 and D50 light source, can calculate interpolation according to the color temperature difference of two kinds of light sources and obtainFinal white balance parameter. And white balance method provided by the invention can be on existing methodical basis, according toEnvironmental form is adjusted the ratio occupying in TL84 light source and the in the end computing of D50 light source, for example, and after adjustmentTL84:D50=2:3, will be the accordingly when calculating weights of considering D50 light sources, reach white moreThe effect of balance optimizing.
It shown in Fig. 3, is the structural representation of the white balance adjustment device that provides of one embodiment of the invention. As Fig. 3Shown in, white balance adjustment device comprises image processor 310, environmental form determination module 320, ratio mappingModule 330 and computing module 340.
In an embodiment of the present invention, image processor 310, for detection of current environment colour temperature, obtains white flatThe initial distribution ratio of weighing apparatus reference point white balance reference point of each light source under current environment.
In an embodiment of the present invention, environmental form determination module 320 is for detection of the exposure system of current environmentNumber, the type of judgement current environment.
Further, environmental form comprises outdoor, indoor and dark place.
In an embodiment of the present invention, ratio mapping block 330 is connected in described environmental form determination module320, for according to the type of current environment, inquire about preset weight adjustment form, draw described current environmentEach light source weighted value.
In an embodiment of the present invention, computing module 340, be connected in described image processor 310 and described inRatio mapping block 330, according to each light source weighted value of current environment, adjusts described initial distribution ratio,Draw final white balance parameter.
In an embodiment of the present invention, also comprise that weight adjustment form sets up module, be connected in described ratio mappingModule, for according to varying environment type, sets up the ginseng of each light source in environmental form and white balance reference pointExamine the mapping relations between distribution proportion, obtain described weight adjustment form.
Further, when environmental form is while being outdoor, in described weight adjustment form, by low color temperature light sourcesRatio is made as 0, the ratio of color temperature light sources in the ratio of raising high color temperature light source reduction;
When environmental form is while being indoor, in described weight adjustment form, improve the ratio of described middle color temperature light sources,Reduce the ratio of described high color temperature light source and described low color temperature light sources; And
In the time that environmental form is dark place, in described weight adjustment form, described high color temperature light source ratio is made as0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
Advantageously, white balance adjusting method and apparatus provided by the invention, utilizes image processor to obtain white flatThe initial distribution ratio of weighing apparatus reference point white balance reference point of each light source under current environment, then according to currentThe factor of environment is judged the type of current environment, according to the type inquiry weight adjustment form of current environment,Obtain each light source weighted value. Finally adjusting the initial of white balance reference point according to each light source weighted value dividesCloth ratio, draws final white balance parameter, directly substantially removed thus due to environmental form erroneous judgement toThe interference that whole white balance is calculated, reaches the object of optimizing white balance reference point. In addition the power under varying environment,Heavily distribute and can user adjust voluntarily, meet customization requirement
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all at thisAny amendment of doing within bright spirit and principle, be equal to and replace and improvement etc., all should be included in the present inventionProtection domain within.
Claims (9)
1. a white balance adjusting method, is characterized in that, comprises the following steps:
Step S1: white balance reference point initial that obtains white balance reference point each light source under current environmentDistribution proportion;
Step S2: detect the factor of current environment, judge the type of current environment;
Step S3: according to the type of current environment, inquire about preset weight adjustment form, draw current environmentEach light source weighted value; And
Step S4: according to each light source weighted value of current environment, adjust described initial distribution ratio, drawFinal white balance parameter.
2. white balance adjusting method as claimed in claim 1, is characterized in that, described step S1 itBefore also comprise:
According to varying environment type, set up the reference distribution of each light source in environmental form and white balance reference pointMapping relations between ratio, obtain described weight adjustment form.
3. white balance adjusting method as claimed in claim 2, is characterized in that, described environmental form comprisesOutdoor, indoor and dark place.
4. white balance adjusting method as claimed in claim 3, is characterized in that:
When described environmental form is while being outdoor, in described weight adjustment form, the ratio of low color temperature light sources is establishedBe 0, the ratio of color temperature light sources in the ratio of raising high color temperature light source reduction;
When described environmental form is while being indoor, in described weight adjustment form, improve described middle color temperature light sourcesRatio, reduces the ratio of described high color temperature light source and described low color temperature light sources light source; And
In the time that described environmental form is dark place, in described weight adjustment form, by described high color temperature light source ratioBe made as 0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
5. white balance adjusting method as claimed in claim 2, is characterized in that, is setting up described weight tuneAfter whole table, user adjusts the described reference distribution ratio of Different Light in described weight adjustment form according to interest.
6. a white balance adjustment device, is characterized in that, comprising:
Image processor, for obtaining the white balance reference of white balance reference point each light source under current environmentThe initial distribution ratio of point;
Environmental form determination module, the factor of detection current environment, the type of judgement current environment;
Ratio mapping block, is connected in described environmental form determination module, for according to the type of current environment,Inquire about preset weight adjustment form, draw each light source weighted value of current environment; And
Computing module, is connected in described image processor and described ratio mapping block, according to current environmentEach light source weighted value, adjusts described initial distribution ratio, draws final white balance parameter.
7. white balance adjustment device as claimed in claim 6, is characterized in that, also comprises weight adjustment formSet up module, be connected in described ratio mapping block, for according to varying environment type, set up environmental formAnd the mapping relations in white balance reference point between the reference distribution ratio of each light source, obtain described weight and adjustWhole table.
8. white balance adjustment device as claimed in claim 7, is characterized in that, described environmental form comprisesOutdoor, indoor and dark place.
9. white balance adjustment device as claimed in claim 8, is characterized in that:
When described environmental form is while being outdoor, in described weight adjustment form, the ratio of low color temperature light sources is establishedBe 0, the ratio of color temperature light sources in the ratio of raising high color temperature light source reduction;
When described environmental form is while being indoor, in described weight adjustment form, improve described middle color temperature light sourcesRatio, reduces the ratio of described high color temperature light source and described low color temperature light sources; And
In the time that described environmental form is dark place, in described weight adjustment form, by described high color temperature light source ratioBe made as 0, improve the ratio of described low color temperature light sources and reduce the ratio of described middle color temperature light sources.
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| CN108182667B (en) * | 2017-12-29 | 2020-07-17 | 珠海大横琴科技发展有限公司 | Image optimization method, terminal and computer readable storage medium |
| CN108881875A (en) * | 2018-08-16 | 2018-11-23 | Oppo广东移动通信有限公司 | Image white balancing treatment method, device, storage medium and terminal |
| WO2022174456A1 (en) * | 2021-02-22 | 2022-08-25 | 深圳市大疆创新科技有限公司 | Image white balance adjustment method and apparatus, photographing device, and storage medium |
| US20220394224A1 (en) * | 2021-06-04 | 2022-12-08 | Canon Kabushiki Kaisha | Apparatus, control method, and storage medium |
| US11825210B2 (en) * | 2021-06-04 | 2023-11-21 | Canon Kabushiki Kaisha | Apparatus, control method, and storage medium |
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