CN106375636B - A kind of compensation method of the vignetting effect of the flash of light of camera - Google Patents
A kind of compensation method of the vignetting effect of the flash of light of camera Download PDFInfo
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- CN106375636B CN106375636B CN201610883290.8A CN201610883290A CN106375636B CN 106375636 B CN106375636 B CN 106375636B CN 201610883290 A CN201610883290 A CN 201610883290A CN 106375636 B CN106375636 B CN 106375636B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000694 effects Effects 0.000 title claims abstract description 14
- 238000012937 correction Methods 0.000 claims abstract description 60
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- 238000005192 partition Methods 0.000 claims abstract description 6
- 241000532370 Atla Species 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 231100000289 photo-effect Toxicity 0.000 description 2
- 240000004343 Indigofera suffruticosa Species 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
Abstract
The invention discloses a kind of compensation methodes of the vignetting effect of the flash of light of camera, include the following steps：Camera and flash lamp are opened, so that colour atla is taken entire screen and takes pictures；The matrix partition that the photo of shooting is marked off to 17x13 using photoshop is recorded the R values of each subregion, G values, B values and stored；The R gain correction coefficients and B gain correction coefficients of camera are obtained by camera debugging software, the R gain correction coefficients and B gain correction coefficients are all the matrix parameter of 17x13；Calculate new r values, G values and b values；Calculate new R gain correction coefficients and B gain correction coefficients；New R gain correction coefficients and B gain correction coefficients are adjusted according to photo partially red or partially blue state and regulation coefficient k, R gain correction coefficients after adjustment and B gain correction coefficients are imported into camera, the colorimetric compensation that glistens is carried out to the photo of shooting to realize.
Description
Technical field
The present invention relates to a kind of flash of light vignetting effect compensation methodes of camera.
Background technology
People often remove the drop of record daily life with mobile phone or camera, but in the case where light environment is bad, clap
Photographic quality out is bad.It takes pictures especially with mobile phone camera, mobile phone camera is by handset size and component
Influence, function is much abundant not as good as camera.And mobile phone has become people's routine work, a life part, present mobile phone is not
It can only be used for making a phone call, can also be chatted by surfing Internet with cell phone, do shopping and take pictures, former people stay to clap to open to comply
Love, or note down the development history of child, it is necessary to photo studio is gone to, present people take out the mobile phone of oneself at any time, right
Oneself interested thing claps a photograph, is dealt into circle of friends and goes to share, the effect of taking pictures of mobile phone is paid attention to by major mobile phone business men.
When ambient brightness is bad, lighting can be additionally given in the prior art, or glisten using opening
The mode of lamp goes to make up, although these modes can provide certain illumination, photo effect or bad.Influence flash lamp
The principal element of effect is：Light filling andVignetting effectCompensation, the light for many times flashing out is not necessarily uniform, it is by very
Multifactor impact, such as the quality of flash lamp itself, lampshade, the assembling of lampshade, and the distance flashed, it is so many because
Element is difficult management and control, so vignetting effect（shading）Aobvious particularly important, the colored vignetting effect of compensation（color
shading）What is compensated is uniform, and the photo color compensating for flashing out is more uniform, and the homogeneity of brightness can also show more preferable.
Shading Producing reasons are because camera lens is circular, this necessarily determines the brightness of surrounding relative to center
Brightness it is low, surrounding need to be compensated by software, the brightness to reach surrounding becomes paracentral brightness, but due to each scene color
Warm different, the trichromatic color abilities of RGB are different under different-colour（The transmission capacity of low color temperature R is strong, the transmission of high color temperature B
Ability is strong）, to surrounding and center misalignment occur；
Present high pass and MTK are that 18% gray card is shot under total darkness environment（Ash 100% is black, and ash 1% is white, ash
18% is that white muted color is biased between black and white）, by software tool generate calibration parameter, then using the calibration parameter as
The shading of flash lamp is compensated, and the method does not account for flash lamp/light compensating lamp and flashes the problems such as uneven, causes part partially
Red partially green problem, so the photo for flashing out will appear very serious color shading（Color uniformity）, show
The photo effect come is poor, and local colour cast is apparent.
Invention content
The present invention proposes a kind of vignetting effect of the flash of light of camera to solve above-mentioned the technical problems existing in the prior art
The compensation method answered.
The compensation method of the vignetting effect of the flash of light of camera proposed by the present invention includes the following steps：
A kind of compensation method of the vignetting effect of the flash of light of camera, which is characterized in that include the following steps：
Step 1. opens camera, 18% gray card of camera face, and gray card is made to take entire screen, is opened under completely black environment
Open taking photos by using flashlights photo；
Step 2. opens the photo of shooting using photoshop, and slice tool is selected to mark off the photo that camera is shot
The matrix partition of 17x13 selects R values, G values, the B values of each subregion of color sample tool records, and list stores；
Step 3. obtains R gain correction coefficient R_ration and the B gain correction coefficients of camera by camera debugging software
B_ration, the R gain correction coefficients R_ration and B gain correction coefficient B_ration are all the matrix parameter of 17x13；
Step 4. calculates not calibrated red component r and blue component b by following formula, and r values, G values, b values are arranged
Table stores：
R=R/R_ration, b=B/B_ration；
Light filling is calculated in the above-mentioned red component r being calculated and blue component b values by step 5. according to the following formula
The 2nd R gain correction coefficient r_ration values and the 2nd B gain correction coefficient b_ration values afterwards simultaneously store：
R_ration=G/r, b_ration=G/b;
Step 6. judges whether the photo of shooting is partially red, if partially red, fixes the 2nd B gain correction coefficient b_ration,
The 2nd R gain correction coefficient r_ration are reduced, the 2nd R gain correction coefficients r_ration is multiplied into a regulation coefficient k, is obtained
R_rat matrixes after to adjustment, R_rat matrixes=k * r_ration；If partially blue, r_ration is fixed, reduces b_
B_ration is multiplied by the regulation coefficient k, the B_rat matrixes after being adjusted, B_rat=k * b_ by ration
Ration, regulation coefficient k>0 and k< 1；
The R_rat matrixes newly obtained are substituted the R gain correction coefficients R_ration matrixes by step 7., by B_rat squares
Battle array substitutes the B gain correction coefficients B_ration matrixes, and imports camera, and the colorimetric compensation that glistens is carried out to the photo of shooting.
The gray card that the colour atla is 18%.
The present invention optimizes former calibration parameter on the basis of original calibration parameter, by a kind of software algorithm, allows
Calibration parameter is more reasonable, solve flash lamp flash caused by the problems such as uneven picture part it is partially red partially green the problems such as.
Description of the drawings
Fig. 1 is the rgb value table of one embodiment of the invention photo.
Fig. 2 is the value table of one embodiment of the invention original R gain correction coefficients and original B gain correction coefficients.
Fig. 3 is the rGb value tables of one embodiment of the invention photo.
Fig. 4 is the value table of one embodiment of the invention new R gain correction coefficients and new B gain correction coefficients.
Fig. 5 is the value table of regulation coefficient k.
Fig. 6 is the value table of R_rat.
Fig. 7 is the product table of rGb values table and R_rat value tables in Fig. 6 in Fig. 3.
Fig. 8 is flow chart of the method for the present invention.
Specific implementation mode
The principle of the present invention and structure are described in detail with reference to the accompanying drawings and examples.
In existing mobile phone camera, the shading compensation to flash lamp is that 18% gray card is shot under total darkness environment, passes through phase
Machine debugging software generates gain correction coefficient, and gain correction coefficient is mainly for the R values and B values of color, the R gains of referred to as R and B
Correction coefficient R_ration and B gain correction coefficient B_ration.Then using the gain correction coefficient as flash lamp
Shading is compensated, and the method does not account for flash lamp/light compensating lamp and flashes uneven, causes the partially red partially green problem in part.
The present invention proposes that the compensation method of the vignetting effect of the flash of light of camera includes the following steps：
Step 1. opens the camera of mobile phone, and open flash lamp makes gray card take entire screen by mobile phone against 18% gray card
Curtain, takes pictures under completely black environment.
Step 2. opens the photo of shooting using photoshop softwares, the photograph for selecting slice tool to shoot mobile phone camera
Piece marks off the matrix partition of 17x13, selects R values, G values and the B values of each subregion of color sample tool records, and list is deposited
Storage.
Specifically when selecting slice tool, the selection of right click photo divides slice in software first, selects horizontal division, if
17 longitudinal sections are set to, even partition is clicked and determined；Then, right click selection divides slice, cancels horizontal division, and selection is hung down
It is straight to divide, 13 slices across are set as, even partition is clicked and determined；Right click the Eyedropper tool again selects color sample tool,
Clicked on color sample tool mark off come 17x13 subregion center, and by R, G, B value of each subregion record
Get off, the rgb value after record is shown in the table 1 in Fig. 1.
Step 3. obtains former R gain correction coefficients R_ration (addition coefficient for being also R) and the original B gains school of camera
Positive coefficient B_ration (addition coefficient for being also B), R gain correction coefficient R_ration and B gain correction coefficient B_ration
It is all the matrix parameter of 17x13, sees the table 2 in Fig. 2.
Step 4. calculates not calibrated red component r and blue component b by following formula, and r values, G values, b values are arranged
Table stores：
R=R/R_ration, b=B/B_ration；
R, G, b value that not addition is obtained after calculating are shown in table 3 in Fig. 3.
The 2nd R gains school after light filling is calculated in above-mentioned r, G, b value being calculated by step 5. according to the following formula
Positive coefficient r_ration values and the 2nd B gain correction coefficient b_ration values simultaneously store：
R_ration=G/r, b_ration=G/b;
2nd R gain correction coefficient r_ration matrixes of the not addition obtained after calculating and the 2nd B gain calibrations system
Number b_ration matrixes, are shown in table 4 in Fig. 4.
Step 6. judges whether the photo of shooting is partially red, if partially red, fixes the 2nd B gain correction coefficient b_ration,
The 2nd R gain correction coefficient r_ration are reduced, the 2nd R gain correction coefficients r_ration is multiplied into a regulation coefficient k, is obtained
R_rat matrixes after to adjustment, R_rat matrixes=k * r_ration；If partially blue, the 2nd R gain correction coefficients r_ is fixed
Ration reduces the 2nd B gain correction coefficient b_ration, the 2nd B gain correction coefficients b_ration is multiplied a coefficient
K, the B_rat matrixes after being adjusted, B_rat=k * b_ration, regulation coefficient k>0 and k< 1.
Check the photo for flashing out, according to the picture collection from shooting to Fig. 1 in table 1 data judge, if R>
G, picture is partially red, then fixes the 2nd B gain correction coefficient b_ration, reduces the 2nd R gain correction coefficient r_ration, will
2nd R gain correction coefficients r_ration multiplies a regulation coefficient k：K * r_ration, k> 0 & k < 1.In order not to make
The setting of k values is excessive, and the amplitude of accommodation is excessive, and regulation coefficient k values are set as to 0.02 multiple, k=0.02*i, i>0&i<50, R =
K* r_ration * r then position final r_ration values when R is close to B or R=B；If R<G, picture are inclined
Indigo plant then fixes r_ration, reduces b_ration, b_ration is multiplied a regulation coefficient k：K * b_ration, k>
0 & k <1, k=0.02*i, i>0&i<50, B = k* b_ration * b.
Due to the matrix that r_ration and b_ration is 17 x 13, for more preferable flexible adjusting r_ration and b_
K values can be likewise provided as the matrix of 17 x 13 by ration matrixes, by k value matrixs one-to-one correspondence be multiplied by r_ration and
B_ration, change k value matrixs in each k values, you can change each collection point of the picture of shooting r_ration and
B_ration values, to change the R values and B values of each collection point, the matrix of k values 17x13 is shown in table 5 in Fig. 5.
Manual modification individually is done to some k value in the k value matrixs of 17 x 13, it is uneven to be likely to result in color transition
Smooth, in order to which modified parameter is taken, the photo come is more smooth and accurate, we can select 9 references in k value matrixs
Point（The more certain reference point the more accurate）, and the value between reference point and reference point is obtained by following formula：
(Km - Kn) / (m-n) * i + K(n+i) (m > n, i < m, i = 1, 2, 3 ... m-1)
Wherein Kn, Km are the values of reference point, and Kn is preceding reference point, and Km is rear reference point, can by change reference point value,
Change K change direction, preferably control the variation of image RGB, design parameter is see the table 5 in Fig. 5.
Pass through k * r_ration (k> 0 & k <1, k=0.02*i, i>0&i<50), by the k value matrixs of 17 x 13
It is multiplied with r_raion the b_ration values of 17 x 13 one-to-one correspondence, obtains the R_ of 17 x 13 after a new adjustment
Rat matrixes, design parameter are shown in the R_rat matrixes in Fig. 6.
Similarly, if R<G, picture is partially blue, adjusts the 2nd B gain correction coefficient b_ration, can get one group of new B_
Rat values.
According to R=R_rat * r (R_rat=k*r_ration), by the R_rat matrixes of 17 new x 13 and figure
The r value matrixs of table 3 in 3 are multiplied one by one, and obtained R values are replaced to the R values of table 1 in Fig. 1, the 17x13's after being emulated
Rgb matrix is shown in table 7 in Fig. 7, and table in Fig. 77 and table in Fig. 11 are compared, and the R values of table 7 are more being approached with G and B in Fig. 7,
Illustrate new table 7 closer to white balance.
The R_rat matrixes newly obtained are substituted original R gain correction coefficient R_ration matrixes by step 7., or by B_rat
Matrix substitutes original B gain correction coefficient number b_ration matrixes, and imports camera.It imports camera and realizes that the compensation of vignetting effect is former
Reason is：The camera of mobile phone receives light source output raw figures, and raw, which schemes each pix points, only has single R values, G values or B values, root
According to the principle of three primary colours, the pix point differences for containing only single R values, G values or B values are contained into R values, G values and B at each pix points
It is worth, the data after interpolation pass through the deduction of OB（OB is the dark current of the formation such as light leakage, by dark current button because module generates heat
It removes）, shading compensation, addition AE（Automatic exposure）、AF（Auto-focusing）And AWB（Automatic white balance）, and with ISP（Isp packets
Include ASP（Analog Signal Processing）、ADC（Analog-Digital Converter）, image processing early period
（Pre-ISP）With rear end image processing（Post-ISP)）Processing, ultimately generates yuv data, is packaged into jpg pictures；
The present invention is optimized to former calibration parameter by a kind of software algorithm on the basis of original calibration parameter,
Make calibration parameter more reasonable, solve flash lamp flash caused by the problems such as uneven picture part it is partially red partially green the problems such as.
Embodiments above is only to the structure illustrated the present invention, and those skilled in the art are in the present invention
Design under can make various deformation and variation, these deformation and variation be included within protection scope of the present invention.
Claims (6)
1. a kind of compensation method of the vignetting effect of the flash of light of camera, which is characterized in that include the following steps：
Step 1. opens camera, against colour atla and colour atla is made to take entire screen, is shot under completely black environment using flash lamp
Photo；
Step 2. opens the photo of shooting using photoshop, selects slice tool that the photo of shooting is marked off 17x13's
Matrix partition selects R values, G values, the B values of each subregion of color sample tool records, and list stores；
Step 3. obtains the R gain correction coefficient R_ration and B gain correction coefficients B_ of camera by camera debugging software
Ration, the R gain correction coefficients R_ration and B gain correction coefficient B_ration are all the matrix parameter of 17x13；
Step 4. calculates not calibrated red component r and blue component b by following formula, and r values, G values, b value lists are deposited
Storage：
R=R/R_ration, b=B/B_ration；
After light filling is calculated according to the following formula in the above-mentioned red component r being calculated and blue component b values by step 5.
2nd R gain correction coefficient r_ration values and the 2nd B gain correction coefficient b_ration values simultaneously store：
R_ration=G/r, b_ration=G/b;
Step 6. judges whether the photo of shooting is partially red, if partially red, fixes the 2nd B gain correction coefficient b_ration, drops
2nd R gain correction coefficients r_ration is multiplied a regulation coefficient k, obtained by low 2nd R gain correction coefficient r_ration
R_rat matrixes after adjustment, R_rat matrixes=k * r_ration；If partially blue, r_ration is fixed, reduces b_ration,
B_ration is multiplied by the regulation coefficient k, the B_rat matrixes after being adjusted, B_rat=k * b_ration, adjustment system
Number k>0 and k< 1；
The R_rat matrixes newly obtained are substituted the R gain correction coefficients R_ration matrixes by step 7., and B_rat matrixes are replaced
For the B gain correction coefficients B_ration matrixes, and camera is imported, the colorimetric compensation that glistens is carried out to the photo of shooting；
The colour atla is 18% gray card.
2. the method as described in claim 1, which is characterized in that the regulation coefficient k=0.02*i, i>0 and i<50.
3. method as claimed in claim 2, which is characterized in that the regulation coefficient k is the matrix of a 17*13.
4. the method as described in claim 1, which is characterized in that in step 6, if R>G, then photo is partially red, if R<G, then
Photo is partially blue.
5. the method as described in claim 1, which is characterized in that the photo that camera is shot is divided by the camera debugging software
17*13 module does white balance, to obtain R gain correction coefficient R_ration and B gain correction coefficients B_ration.
6. the method as described in claim 1, which is characterized in that the flash lamp is the flash lamp that camera carries, or with
The mutually independent flash lamp of camera.
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| CN201610883290.8A CN106375636B (en) | 2016-10-10 | 2016-10-10 | A kind of compensation method of the vignetting effect of the flash of light of camera |
| PCT/CN2017/080030 WO2018068488A1 (en) | 2016-10-10 | 2017-04-11 | Method for compensating camera flash vignetting |
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| CN201610883290.8A CN106375636B (en) | 2016-10-10 | 2016-10-10 | A kind of compensation method of the vignetting effect of the flash of light of camera |
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| CN106375636B (en) * | 2016-10-10 | 2018-07-17 | 硕诺科技（深圳）有限公司 | A kind of compensation method of the vignetting effect of the flash of light of camera |
| TWI807742B (en) * | 2022-03-30 | 2023-07-01 | 華碩電腦股份有限公司 | Electronic device with flash function and driving method of flash |
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| CN101159879A (en) * | 2006-10-08 | 2008-04-09 | 普立尔科技股份有限公司 | Digital picture capturing device and white balance adjustment method thereof |
| TW201026031A (en) * | 2008-12-17 | 2010-07-01 | Altek Corp | Digital image-capturing device and brightness correction method thereof |
| CN102946501A (en) * | 2011-05-26 | 2013-02-27 | 北京泰邦天地科技有限公司 | Color distortion correction method and device in imaging system or image output system |
| CN105338334A (en) * | 2015-10-30 | 2016-02-17 | 华勤通讯技术有限公司 | Calibration method and calibration system for cameras in mobile terminals |
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| JP5649409B2 (en) * | 2010-11-04 | 2015-01-07 | 株式会社東芝 | Image processing device |
| JP5917258B2 (en) * | 2012-04-20 | 2016-05-11 | キヤノン株式会社 | Image processing apparatus and image processing method |
| CN103685902B (en) * | 2012-09-03 | 2018-08-10 | 联想(北京)有限公司 | A kind of mobile phone controlling flash lamp using camera sensitive chip |
| CN104394329B (en) * | 2014-11-28 | 2017-12-12 | 东莞宇龙通信科技有限公司 | A kind of photographic method, device and mobile terminal |
| CN106375636B (en) * | 2016-10-10 | 2018-07-17 | 硕诺科技（深圳）有限公司 | A kind of compensation method of the vignetting effect of the flash of light of camera |
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- 2016-10-10 CN CN201610883290.8A patent/CN106375636B/en active Active
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- 2017-04-11 WO PCT/CN2017/080030 patent/WO2018068488A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159879A (en) * | 2006-10-08 | 2008-04-09 | 普立尔科技股份有限公司 | Digital picture capturing device and white balance adjustment method thereof |
| TW201026031A (en) * | 2008-12-17 | 2010-07-01 | Altek Corp | Digital image-capturing device and brightness correction method thereof |
| CN102946501A (en) * | 2011-05-26 | 2013-02-27 | 北京泰邦天地科技有限公司 | Color distortion correction method and device in imaging system or image output system |
| CN105338334A (en) * | 2015-10-30 | 2016-02-17 | 华勤通讯技术有限公司 | Calibration method and calibration system for cameras in mobile terminals |
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| WO2018068488A1 (en) | 2018-04-19 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A compensation method for vignetting effect of camera flash Effective date of registration: 20230131 Granted publication date: 20180717 Pledgee: Dezhou Rural Commercial Bank Co.,Ltd. Pledgor: Yingwang Technology (Shandong) Co.,Ltd. Registration number: Y2023980031755 |