CN102685513A - White balance processing method and device - Google Patents
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Abstract
The embodiment of the invention discloses a white balance processing method and device. The white balance processing method comprises the following steps of: obtaining a picture obtained by a module of a camera to be corrected under a pre-set light source, calculating an average value of red R, green G and blue B within a picture setting range, and calculating a white balance actual value corresponding to a white balance standard value through the average value, wherein the white balance standard value is obtained by obtaining a picture under the pre-set light source by using a standard module, calculating the average value of the red, the green and the blue within the picture setting range, and calculating through average value; obtaining gains of the red, the green and the blue of the white balance into a control register of a sensor of the camera to be corrected through a white balance value actual value and the white balance standard value; and writing the gains of the red, the green and the blue of the white balance to a control register of a sensor of the camera to be corrected. The problems of color cast of a single module, color consistency of different modules, and image color cast can be solved by carrying out proper correction of the white balance on RAW DATA output by the camera.
Description
Technical field
The present invention relates to image processing field, particularly a kind of processing method of white balance and device.
Background technology
White balance (Auto White Balance) is meant under different colour temperatures, the real picture that the image that transducer (Sensor) is gathered is seen near human eye, and just: it also is white making white object under different colour temperatures, take the image that obtains.
Initial data (RAW DATA) is unprocessed, the also data of uncompressed, is the initial data that transducer is converted into the light signal that captures digital signal.The sensor can be: (Complementary Metal Oxide Semiconductor, transducer CMOS) also can be the transducers of charge coupled cell (Charge-coupled Device) to complementary metal oxide semiconductors (CMOS).
The exportable several data form of cmos sensor or ccd sensor, for example YUV422, RGB565, RAW etc., YUV, in " Y " expression lightness (Luminance or Luma), just GTG value; It is a baseband signal." U " then is colourity (Chrominance or Chroma) with " V " expression, and effect is to describe colors of image and saturation, is used for the color of specified pixel.U and V be not baseband signal, and it is two by quadrature modulation.Because RAW has write down real image data to greatest extent; Handle the back with regard to its image quality of passable raising through rear end (for example cell phone platform); Because the camera price of output RAW data format is lower, increasing Sensor factory and client select to export the Sensor and the camera of RAW form.
The inventor finds in realizing the embodiments of the invention process: RAW DATA is from the data of the direct output of Sensor of CCD or CMOS, does not have through handling.Owing to the reason of semiconducter process can cause the inconsistent colour cast that occurs of Sensor output image color, what the difference between the different modules caused having maybe be red partially, the indigo plant partially that has.
Summary of the invention
The embodiment of the invention provides a kind of processing method and device of white balance, is used to solve the problem of image colour cast.
A kind of processing method of white balance comprises:
Obtain the picture that the module of waiting to correct camera obtains under preset light sources, and calculate the mean value of red R, green G, blue B in the picture setting range, and through the mean value calculation white balance actual value corresponding with the white balance standard value; Said white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
Through said white balance actual value and said white balance standard value, calculate the gain of white balance red, green, blue;
The gain of said white balance red, green, blue is write the control register of the transducer of camera said to be corrected.
A kind of processing unit of white balance comprises:
Image acquisition unit is used to obtain the picture that the module of waiting to correct camera obtains under preset light sources;
White balance is calculated the unit, is used for the mean value of red R, green G, blue B in the picture setting range that the computed image acquiring unit obtains, and through the mean value calculation white balance actual value corresponding with the white balance standard value; Said white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
The gain calculating unit is used for calculating the gain of white balance red, green, blue through said white balance actual value and said white balance standard value;
The gain writing unit is used for the gain of said white balance red, green, blue is write the control register of the transducer of camera said to be corrected.
Can find out from above technical scheme; The embodiment of the invention has the following advantages: add suitable white balance correction through the RAW DATA to camera output and handle; Color consistency problem between the colour cast that solves single module and different modules has solved the problem of image colour cast.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is briefly introduced in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skill in the art; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is an embodiment of the invention method flow sketch map;
Fig. 2 is another method schematic flow sheet of the embodiment of the invention;
Fig. 3 is an embodiment of the invention apparatus structure sketch map.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is done to describe in detail further below, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of processing method of white balance, and is as shown in Figure 1, comprising:
101: obtain the picture that the module of waiting to correct camera obtains under preset light sources, and calculate the mean value of red R, green G, blue B in the picture setting range, and through the mean value calculation white balance actual value corresponding with the white balance standard value;
Above-mentioned white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
The situation that above embodiment has confirmed based on the standard module; If the standard module is not confirmed; Before 101, also comprise so: under standard sources, use the canonical parameter images acquired of transducer, choose the corresponding module of the optimum transducer of white balance effect as the standard module.The subsequent implementation example will be described in more detail at this point.
Particularly, above-mentioned standard sources is: colour temperature is the standard sources of 6500K, and perhaps, colour temperature is the even standard sources of 5100K.For example: D65 light source (Artificial Daylight 6500K), D65 light source are alpine lights commonly used in the standard sources, and its colour temperature is 6500K.DNP light source (Dai Nippon Printing), the DNP light source is a kind of uniform source of light, can send the uniform source of light of 5100K or 6500K colour temperature.
Particularly, above-mentioned setting range is: the high scope of 1/5 wide * 1/5 of picture central area.Need to prove that if other zones also are fine, above favored area should not be construed as the qualification to the embodiment of the invention.
Preferably; Because human eye is the most responsive to green G component; The G component of exporting among the COMS Sensor is maximum; With G as reference precision than higher, the mean value of red, green, blue in the aforementioned calculation picture setting range obtains the white balance standard value through mean value calculation then and comprises: calculates R, G, the mean value r_avg of B, g_avg, b_avg in the picture setting range so; Calculate the standard value golden_rg and the golden_bg of white balance then; Golden_rg=r_avg/g_avg wherein, golden_bg=b_avg/g_avg;
Correspondingly, above-mentionedly comprise: the actual value current_rg and the current_bg that calculate white balance through mean value r_avg*, g_avg*, the b_avg* of R, G, B through the mean value calculation white balance actual value corresponding with the white balance standard value; Current_rg=r_avg*/g_avg* wherein, current_bg=b_avg*/g_avg*.
102:, calculate the gain of white balance red, green, blue through above-mentioned white balance actual value and above-mentioned white balance standard value;
Preferably; Based on preferred version in 101; The embodiment of the invention also further provide G the Calculation of Gain scheme: through above-mentioned white balance actual value and above-mentioned white balance standard value, the gain that calculates the white balance red, green, blue comprises: the difference cmp_rg and the cmp_bg that calculate white balance actual value and white balance standard value; Cmp_rg=1.0*current_rg/golden_rg wherein, cmp_bg=1.0*current_bg/golden_bg;
If cmp_rg and cmp_bg are benchmark with the G passage then all less than 1, gain ratio_r and the ratio_b of R and B are respectively: ratio_r=1/cmp_rg, ratio_b=1/cmp_bg;
If cmp_rg greater than 1 and cmp_rg greater than cmp_bg, be benchmark then with the R passage, gain ratio_g and the ratio_b of G and B are respectively: ratio_g=cmp_rg, ratio_b=cmp_rg/cmp_bg;
If cmp_bg is greater than 1, and cmp_bg is benchmark with the B passage then greater than cmp_rg, and gain ratio_g and the ratio_r of G and R are respectively: ratio_g=cmp_bg, ratio_r=cmp_bg/cmp_rg.
103: the control register that the gain of above-mentioned white balance red, green, blue is write the transducer of camera above-mentioned to be corrected.
Alternatively, above-mentioned gain with the above-mentioned white balance red, green, blue control register that writes the transducer of camera above-mentioned to be corrected comprises: the control register that the gain of R, G, B is write the transducer of camera above-mentioned to be corrected through One Time Programmable write memory OTP.(One-time programmable memory OTP) writes the gain of R, G, B the control register of the transducer of camera above-mentioned to be corrected to the embodiment of the invention through the One Time Programmable write memory.Sensor inside carries memory space, can only write once.Need to prove that the mode that writes control register is can be substituted by other modes, does not influence the realization of the embodiment of the invention, the embodiment of the invention will not limit this.
The white balance principle that the embodiment of the invention provides is following: have one group of register (control register) to be used for adjusting respectively the gain of R, G, B (red Red, green Green, blue Blue) in transducer (Sensor) inside, reach white balance through the magnification ratio of controlling these three passages.
Above embodiment adds suitable white balance correction through the RAW DATA to camera output to be handled, and the color consistency problem between the colour cast that solves single module and different modules has solved the problem of image colour cast.
The embodiment of the invention gives illustrating of above embodiment, and the rear end of present embodiment is example with the mobile phone, and is specifically as shown in Figure 2, comprising:
201: selection standard module (Golden Sample):
Prepare 30 ~ 50 camera samples, under D65 or 5100K DNP light source, the canonical parameter that provides through Sensor factory (be a cover register setting that provides by Sensor factory, so that Sensor can operate as normal, output image.), images acquired, choosing does not have colour cast or the reasonable module of white balance as the standard module, (this module can offer rear end platform merchant, and the rear end is transferred to image effect best to this module).
202: the R/G of basis of calculation module and B/G, the standard value of R/G and B/G is golden_rg and golden_bg in correcting as white balance; Under D65 or DNP light source, treat that preview screen exposure is stable after, the mean value that calculates R that picture central area 1/5Width*1/5Height had a few, G, B is r_avg, g_avg, b_avg; Golden_rg=r_avg/g_avg, golden_bg=b_avg/g_avg.
Need to prove that 201 and 202 is the processes that preset, above two steps do not need all to carry out at every turn for the flow process that white balance is handled.
203: calculate the R/G and the B/G of camera module to be corrected, that is: current_rg and current_bg.
The computational methods of current_rg and current_bg identical with 202 methods (need under same lighting environment).Can write current_rg and current_bg through OTP and be input to the memory space that Sensor itself carries, do white balance algorithm so that the rear end cell phone platform reads these data.
204: cell phone platform adds Raw Data white balance algorithm:
Difference through more current camera R/G and B/G value (being to calculate in the step 3) and standard camera R/G and B/G value (step 2 obtains); Calculate the gain of Sensor manual white balance R, G, B, make the R/G of camera and standard camera of current use the same with the B/G value.
205: the yield value of R, G, B is write Sensor control corresponding register:
After overcorrect, the effect of current module all approaches the standard module, thereby has solved conforming problem
Such as the OV5647/OV5650 gain calculating with write:
Above embodiment adds suitable white balance correction through the RAW DATA to camera output to be handled, and the color consistency problem between the colour cast that solves single module and different modules has solved the problem of image colour cast.
The embodiment of the invention also provides a kind of processing unit of white balance, and is as shown in Figure 3, comprising:
White balance is calculated unit 302, is used for the mean value of red R, green G, blue B in the picture setting range that computed image acquiring unit 301 obtains, and through the mean value calculation white balance actual value corresponding with the white balance standard value; Above-mentioned white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
Gain calculating unit 303 is used for calculating the gain of white balance red, green, blue through above-mentioned white balance actual value and above-mentioned white balance standard value;
Above embodiment adds suitable white balance correction through the RAW DATA to camera output to be handled, and the color consistency problem between the colour cast that solves single module and different modules has solved the problem of image colour cast.
Preferably, the mean value of red, green, blue in the aforementioned calculation picture setting range obtains the white balance standard value through mean value calculation then and comprises: calculate R, G, the mean value r_avg of B, g_avg, b_avg in the picture setting range; Calculate the standard value golden_rg and the golden_bg of white balance then; Golden_rg=r_avg/g_avg wherein, golden_bg=b_avg/g_avg;
Above-mentioned white balance is calculated unit 302; The mean value that specifically is used for red R, green G, blue B in the picture setting range that the computed image acquiring unit obtains, and calculate the actual value current_rg and the current_bg of white balance through mean value r_avg*, g_avg*, the b_avg* of R, G, B; Current_rg=r_avg*/g_avg* wherein, current_bg=b_avg*/g_avg*.
Preferably, above-mentioned gain calculating unit 303 specifically is used to calculate the difference cmp_rg and the cmp_bg of white balance actual value and white balance standard value; Cmp_rg=1.0*current_rg/golden_rg wherein, cmp_bg=1.0*current_bg/golden_bg;
If cmp_rg and cmp_bg are benchmark with the G passage then all less than 1, gain ratio_r and the ratio_b of R and B are respectively: ratio_r=1/cmp_rg, ratio_b=1/cmp_bg;
If cmp_rg greater than 1 and cmp_rg greater than cmp_bg, be benchmark then with the R passage, gain ratio_g and the ratio_b of G and B are respectively: ratio_g=cmp_rg, ratio_b=cmp rg/cmp_bg;
If cmp_bg is greater than 1, and cmp_bg is benchmark with the B passage then greater than cmp_rg, and gain ratio_g and the ratio_r of G and R are respectively: ratio_g=cmp_bg, ratio_r=cmp_bg/cmp_rg.
It should be noted that among the said equipment embodiment that each included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize function corresponding; In addition, the concrete title of each functional unit also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition; One of ordinary skill in the art will appreciate that all or part of step that realizes among above-mentioned each method embodiment is to instruct relevant hardware to accomplish through program; Corresponding program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the embodiment of the invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the processing method of a white balance is characterized in that, comprising:
Obtain the picture that the module of waiting to correct camera obtains under preset light sources, and calculate the mean value of red R, green G, blue B in the picture setting range, and through the mean value calculation white balance actual value corresponding with the white balance standard value; Said white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
Through said white balance actual value and said white balance standard value, calculate the gain of white balance red, green, blue;
The gain of said white balance red, green, blue is write the control register of the transducer of camera said to be corrected.
2. according to the said method of claim 1, it is characterized in that, also comprise:
Under standard sources, use the canonical parameter images acquired of transducer, choose the corresponding module of the optimum transducer of white balance effect as the standard module.
3. according to the said method of claim 1, it is characterized in that said standard sources is: colour temperature is the standard sources of 6500K, and perhaps, colour temperature is the even standard sources of 5100K.
4. according to any said method of claim 1 to 3, it is characterized in that, calculate the mean value of red, green, blue in the picture setting range, obtain the white balance standard value through mean value calculation then and comprise:
Calculate R, G, the mean value r_avg of B, g_avg, b_avg in the picture setting range; Calculate the standard value golden_rg and the golden_bg of white balance then; Golden_rg=r_avg/g_avg wherein, golden_bg=b_avg/g_avg;
Saidly comprise through the mean value calculation white balance actual value corresponding with the white balance standard value:
Calculate the actual value current_rg and the current_bg of white balance through mean value r_avg*, g_avg*, the b_avg* of R, G, B; Current_rg=r_avg*/g_avg* wherein, current_bg=b_avg*/g_avg*.
5. according to the said method of claim 4, it is characterized in that said setting range is: the high scope of 1/5 wide * 1/5 of picture central area.
6. according to the said method of claim 4, it is characterized in that through said white balance actual value and said white balance standard value, the gain that calculates the white balance red, green, blue comprises:
Calculate the difference cmp_rg and the cmp_bg of white balance actual value and white balance standard value; Cmp_rg=1.0*current_rg/golden_rg wherein, cmp_bg=1.0*current_bg/golden_bg;
If cmp_rg and cmp_bg are benchmark with the G passage then all less than 1, gain ratio_r and the ratio_b of R and B are respectively: ratio_r=1/cmp_rg, ratio_b=1/cmp_bg;
If cmp_rg greater than 1 and cmp_rg greater than cmp_bg, be benchmark then with the R passage, gain ratio_g and the ratio_b of G and B are respectively: ratio_g=cmp_rg, ratio_b=cmp_rg/cmp_bg;
If cmp_bg is greater than 1, and cmp_bg is benchmark with the B passage then greater than cmp_rg, and gain ratio_g and the ratio_r of G and R are respectively: ratio_g=cmp_bg, ratio_r=cmp_bg/cmp_rg.
7. according to the said method of claim 1, it is characterized in that the control register that said gain with said white balance red, green, blue writes the transducer of camera said to be corrected comprises:
The gain of R, G, B is write the control register of the transducer of camera said to be corrected through One Time Programmable write memory OTP.
8. the processing unit of a white balance is characterized in that, comprising:
Image acquisition unit is used to obtain the picture that the module of waiting to correct camera obtains under preset light sources;
White balance is calculated the unit, is used for the mean value of red R, green G, blue B in the picture setting range that the computed image acquiring unit obtains, and through the mean value calculation white balance actual value corresponding with the white balance standard value; Said white balance standard value is obtained picture through use standard module and is calculated the mean value of red, green, blue in the picture setting range under preset light sources, obtain through mean value calculation then;
The gain calculating unit is used for calculating the gain of white balance red, green, blue through said white balance actual value and said white balance standard value;
The gain writing unit is used for the gain of said white balance red, green, blue is write the control register of the transducer of camera said to be corrected.
9. said according to Claim 8 device; It is characterized in that; The mean value of red, green, blue in the said calculating picture setting range obtains the white balance standard value through mean value calculation then and comprises: calculate R, G, the mean value r_avg of B, g_avg, b_avg in the picture setting range; Calculate the standard value golden_rg and the golden_bg of white balance then; Golden_rg=r_avg/g_avg wherein, golden_bg=b_avg/g_avg;
Said white balance is calculated the unit; The mean value that specifically is used for red R, green G, blue B in the picture setting range that the computed image acquiring unit obtains, and calculate the actual value current_rg and the current_bg of white balance through mean value r_avg*, g_avg*, the b_avg* of R, G, B; Current_rg=r_avg*/g_avg* wherein, current_bg=b_avg*/g_avg*.
10. according to the said device of claim 9, it is characterized in that,
Said gain calculating unit specifically is used to calculate the difference cmp_rg and the cmp_bg of white balance actual value and white balance standard value; Cmp_rg=1.0*current_rg/golden_rg wherein, cmp_bg=1.0*current_bg/golden_bg;
If cmp_rg and cmp_bg are benchmark with the G passage then all less than 1, gain ratio_r and the ratio_b of R and B are respectively: ratio_r=1/cmp_rg, ratio_b=1/cmp_bg;
If cmp_rg greater than 1 and cmp_rg greater than cmp_bg, be benchmark then with the R passage, gain ratio_g and the ratio_b of G and B are respectively: ratio_g=cmp_rg, ratio_b=cmp_rg/cmp_bg;
If cmp_bg is greater than 1, and cmp_bg is benchmark with the B passage then greater than cmp_rg, and gain ratio_g and the ratio_r of G and R are respectively: ratio_g=cmp_bg, ratio_r=cmp_bg/cmp_rg.
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Address after: 516600 Guangdong Industrial Zone, Shanwei City Road, Lee Lee Industrial City, a district of the building fifteenth Applicant after: Truly Opto-Electronics Ltd. Address before: 516600, Guangdong City, Shanwei Province Industrial Road, Xinli electronic industrial city Applicant before: Truly Semiconductors (Shanwei) Co., Ltd. |
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