CN107659811B - White balance calibration methods, devices and systems - Google Patents
White balance calibration methods, devices and systems Download PDFInfo
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- CN107659811B CN107659811B CN201711107605.0A CN201711107605A CN107659811B CN 107659811 B CN107659811 B CN 107659811B CN 201711107605 A CN201711107605 A CN 201711107605A CN 107659811 B CN107659811 B CN 107659811B
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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
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
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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 embodiment of the present invention provides a kind of white balance calibration methods, devices and systems, and this method includes acquisition xyz chrominance space matrix, and is the rgb chrominance space matrix under RGB coordinate system by the xyz chrominance space matrix conversion；The gain register value in preset range is traversed to choose the target white chromaticity coordinates for meeting default white balance conditions based on the rgb chrominance space matrix；It is adjusted according to ratio of the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture to realize white balance calibration.The present invention has stronger universality, can satisfy the white balance calibration demand of different display equipment, and cost of implementation is low, calibration accuracy is high.
Description
Technical field
The present invention relates to technical field of image processing, in particular to a kind of white balance calibration method, apparatus and are
System.
Background technique
Through inventor the study found that the system maker of current display setup is substantially without to its complete machine progress white balance calibration
Ability.For example, white balance calibration is mainly completed by ray machine factory, especially by Texas Instrument for projector
Interface changes the rotation duty ratio of red, green, blue lamp in ray machine LED light source to realize white balance calibration, so that projection
The system maker of instrument needs to rely on the white balance interface of Texas Instrument, chip factory and the firmware layout of ray machine factory, in addition,
The rotation duty ratio of red, green, blue lamp is adjusted by Texas Instrument's interface and modifies storage sequential file often to will lead to ray machine soft
The problems such as part is unstable, picture colour cast occurs, therefore, to those skilled in the art, urgent need study a kind of versatility it is high,
White balance calibration technology at low cost, calibration accuracy is high.
Summary of the invention
In view of this, the present invention provides a kind of white balance calibration methods, devices and systems, above-mentioned technology can effectively solve the problem that
Problem.
Present pre-ferred embodiments provide a kind of white balance calibration method, which comprises
Xyz chrominance space matrix is obtained, which is based on XYZ coordinate system to collected red picture
Face, green picture, blue picture and white picture are analyzed to obtain；
By the rgb chrominance space matrix that the xyz chrominance space matrix conversion is under RGB coordinate system；
The gain register value in preset range is traversed to choose and meet in advance based on the rgb chrominance space matrix
If the target white chromaticity coordinates of white balance conditions；
It is adjusted according to ratio of the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture
To realize white balance calibration.
Further, based on the rgb chrominance space matrix to the gain register value in preset range traversed with
Choosing the step of satisfaction presets the target white chromaticity coordinates of white balance conditions includes:
Based on additive color principle and according to the rgb chrominance space matrixIt obtains
Component Matrices of the red, green, blue three primary colours component under RGB coordinate systemWherein, [Rr
Gr Br] red chromaticity coordinates of the red picture under RGB coordinate system is represented, [Rg Gg Bg] represents green picture in RGB coordinate system
Under green chromaticity coordinates, [Rb Gb Bb] represents blue chromaticity coordinates of the blue picture under RGB coordinate system, [Rw Gw Bw] represent
Target white chromaticity coordinates of the white picture being calculated based on collected xyz chrominance space matrix under RGB coordinate system；
Based on the rgb chrominance space matrix and the Component Matrices, by formulaAnd formulaIt substitutes into public
FormulaAnd the gain register value is traversed within a preset range, wherein r, g, b generation respectively
Table red, the value of green and blue three primary colours, T represent the value of gain register, and it is bright under XYZ coordinate that Lv represents white picture
Degree；
The target white chromaticity coordinates (x, y) for meeting default white balance conditions is chosen from traversing result.
Further, the red picture, green picture, blue picture and white picture are that display equipment is shown
100% red picture, 100% green picture, 100% blue picture and 100% white picture.
Further, the method also includes:
The corresponding white chromaticity coordinates of white picture is obtained, and analyzes whether the white chromaticity coordinates meets default white balance item
Part, wherein the white chromaticity coordinates is to be analyzed to obtain to white picture is collected based on XYZ coordinate system；
It is based on XYZ coordinate system if it is not, then executing, collected red picture, green picture, blue picture and white are drawn
Analyzed the step of obtaining xyz chrominance space matrix in face.
Further, the method also includes:
It obtains display device temperature and judges whether the temperature reaches preset value, and held when the temperature reaches preset value
Row obtains the step of white picture corresponding white chromaticity coordinates.
Further, before the step of obtaining xyz chrominance space matrix, the method also includes:
Driving instruction is sent to drive the measuring device to be initialized to measuring device and acquire display picture.
Present pre-ferred embodiments also provide a kind of white balance calibration device, and described device includes:
Module is obtained, for obtaining xyz chrominance space matrix, which is based on XYZ coordinate system to adopting
Red picture, green picture, blue picture and the white picture collected is analyzed to obtain；
Space conversion module, for being the rgb chrominance space under RGB coordinate system by the xyz chrominance space matrix conversion
Matrix；
Parameter traversals module, for based on the rgb chrominance space matrix to the gain register value in preset range into
Row traversal is to choose the target white chromaticity coordinates for meeting default white balance conditions；
Ratio adjust module, for according to the target white chromaticity coordinates to three base of red, green, blue in the white picture
The ratio of color is adjusted to realize white balance calibration.
Further, the parameter traversals module includes:
Computing unit, for based on additive color principle and according to the rgb chrominance space matrix
Obtain Component Matrices of the red, green, blue three primary colours component under RGB coordinate systemWherein,
[Rr Gr Br] represents red chromaticity coordinates of the red picture under RGB coordinate system, and [Rg Gg Bg] represents green picture and sit in RGB
Green chromaticity coordinates under mark system, [Rb Gb Bb] represents blue chromaticity coordinates of the blue picture under RGB coordinate system, [Rw Gw Bw]
Target white color of the white picture being calculated based on collected xyz chrominance space matrix under RGB coordinate system is represented to sit
Mark；
Traversal Unit, for being based on the rgb chrominance space matrix and the Component Matrices, by formulaAnd formulaSubstitute into formulaAnd the gain register value is traversed within a preset range, wherein r, g, b are respectively represented
Red, green and blue three primary colours values, T represent the value of gain register, and it is bright under XYZ coordinate that Lv represents white picture
Degree；
Coordinate selection unit, for choosing the target white chromaticity coordinates for meeting default white balance conditions from traversing result
(x,y)。
Present pre-ferred embodiments also provide a kind of white balance calibration system, and the white balance calibration system includes that measurement is set
Standby and display equipment；
The display equipment is for being displayed in red picture, green picture, blue picture and white picture；
The measuring device is used to obtain red picture, green picture, blue picture and the white that the display equipment is shown
Picture, and the red picture, green picture, blue picture and white picture are analyzed to generate xyz based on XYZ coordinate system
Chrominance space matrix；
The display equipment is used to receive the xyz chrominance space matrix that the measuring device is sent, and the xyz coloration is empty
Between matrix conversion be RGB coordinate system under rgb chrominance space matrix；
The display equipment be also used to based on the rgb chrominance space matrix to the gain register value in preset range into
Row traversal is to choose the target white chromaticity coordinates for meeting default white balance conditions；
According to ratio of the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture be adjusted with
Realize white balance calibration.
Further, the display equipment is also used to send driving instruction to the measuring device to drive the measuring device
It is initialized；
The measuring device is used to acquire the display picture of the display equipment after the completion of initialization and is sent to described
Show equipment.
The embodiment of the present invention provides a kind of white balance calibration methods, devices and systems, wherein based on to display equipment show
Show the analysis result of picture realize traversal to gain register value to obtain the target white chromaticity coordinates for meeting white balance conditions,
And the ratio of the red, green, blue three primary colours in white picture is adjusted according to target white chromaticity coordinates realization and reaches white flat
Weighing apparatus calibration, the problems such as can effectively ensure that the stability and uniformity of white balance calibration result, be less prone to picture colour cast.Meanwhile
Present invention also avoids the system maker of display equipment when carrying out white balance calibration to it to other display device producers
It relies on, so that the white balance calibration of display equipment has independence and flexibility.
In addition, for different type, the display equipment of different model, the white balance calibration method, apparatus that the present invention provides
There is stronger universality with system, and realize simply, calibrate at low cost, calibration accuracy height.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the frame structure schematic diagram of white balance calibration system provided in an embodiment of the present invention.
Fig. 2 is the frame structure schematic diagram that equipment is shown shown in Fig. 1.
Fig. 3 is another frame structure schematic diagram of white balance calibration system provided in an embodiment of the present invention.
Fig. 4 is the flow diagram of white balance calibration method provided in an embodiment of the present invention.
Fig. 5 is the frame structure schematic diagram of white balance calibration device provided in an embodiment of the present invention.
Icon: 10- white balance calibration system；20- shows equipment；200- white balance calibration device；210- data acquisition mould
Block；220- space conversion module；230- parameter traversals module；240- ratio adjusts module；300- memory；400- storage control
Device；500- processor；30- measuring device；40-PC machine；50- keyboard.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
As shown in Figure 1, be a kind of frame structure schematic diagram of white balance calibration system 10 provided in an embodiment of the present invention, it should
White balance calibration system 10 includes the measuring device 30 for showing equipment 20 and connecting with the display equipment 20.Wherein, the display
It equipment 20 and can pass through between the measuring device 30, but be not limited to USB and turn Serial Port Line connection.
Compared with prior art, the display equipment 20 can directly control the measuring device 30 and carry out the numbers such as display picture
According to acquisition and transmission, without by PC (personal computer, personal computer) machine as the display equipment 20
With the mode of the intermediary of the measuring device 30, system architecture is simplified, improves the real-time in data exchange process.Example
Such as, in the present embodiment, the display equipment 20 can realize the control etc. to the measuring device 30 by micro- throwing software etc..
Optionally, as shown in Fig. 2, the display equipment 20 includes white balance calibration device 200, memory 300, storage control
Device 400 and processor 500 processed.Specifically, the memory 300, storage control 400, each element of processor 500 mutually it
Between be directly or indirectly electrically connected, to realize the transmission or interaction of data.For example, passing through one or more between these elements
Communication bus or signal wire, which are realized, to be electrically connected.The white balance calibration device 200 includes at least one can be with software or firmware
Form be stored in the memory 300 or be solidificated in it is described display equipment 20 operating system in software function module.
The processor 500 accesses the memory 300 under the control of the storage control 400, for executing the storage
The executable module stored in device 300, such as software function module and computer included by the white balance calibration device 200
Program etc..Optionally, the display equipment 20 may be, but not limited to, television set, projector, DVD, PSP, computer etc..
Herein it should be appreciated that structure shown in FIG. 1 is only to illustrate.The display equipment 20 can have than shown in Fig. 1 more
More perhaps less component or with the configuration different from shown in Fig. 1.Wherein, each component shown in FIG. 1 can by software,
Hardware or a combination thereof is realized.
In addition, the measuring device 30 may be, but not limited to, illumination photometer, colour temperature instrument, colour temperature illumination photometer etc., actual implementation
When, the measuring device 30 can flexibly be chosen according to the concrete type of the display equipment 20, for example, when the display is set
Standby 20 when being projector, and the measuring device 30 can be illumination photometer, when the display equipment 20 is television set, the measurement
Equipment 30 can be with colour temperature instrument etc., and the present embodiment is not particularly limited herein.
Optionally, in addition to it is above-mentioned provide by measuring device 30 with display equipment 20 know between directly interact realize pair
Outside the white balance calibration of the display equipment 20, as shown in figure 3, in the actual implementation process, difference according to the actual situation can also
Controls are waited to show that equipment 20 carries out corresponding data processing etc. by the keyboard 50 connected with the display equipment 20, the present embodiment
Herein with no restrictions.
Further, as shown in figure 4, being that the process of a kind of white balance calibration method that present pre-ferred embodiments provide is shown
It is intended to.The white balance calibration method is applied to display equipment 20 shown in FIG. 1.Below in conjunction with Fig. 4 to the white balance school
The detailed process and step of quasi- method are described in detail.It should be noted that data interactive method of the present invention is not
It is limitation with Fig. 3 and specific order as described below.It should be appreciated that data interactive method part step of the present invention
Rapid sequence can be exchanged with each other according to actual needs or part steps therein also can be omitted or delete.
Step S210: it obtains display device temperature and judges whether the temperature reaches preset value, and reach in the temperature
The step of obtaining white picture corresponding white chromaticity coordinates is executed when preset value.
It, can be further by carrying out white balance calibration again when showing that device temperature reaches preset value in the present embodiment
Ensure white balance calibration effect.It is described aobvious herein it should be understood that carrying out the difference of the display equipment 20 of white balance calibration as needed
Show that the definition of device temperature is also different, for example, the display device temperature can be when the display equipment 20 is projector
The temperature of ray machine inside projector, and the temperature of the ray machine can be obtained by being set to the temperature sensor inside the projector
It takes, for another example, when the display equipment 20 is television set, computer etc., the display device temperature can be display screen temperature, and
It can be obtained by external temperature measurement device measurement, the present embodiment is not particularly limited herein.
In addition, the preset value can carry out flexible setting, this implementation according to model, the difference of classification of display equipment 20
Example is not particularly limited herein.
Herein it should be understood that in addition to above-mentioned display equipment 20 directly acquires the temperature of itself and when temperature reaches preset value
Start except blank level adjustment.It, can also be by the PC machine that is connect with the display equipment 20 referring to Fig. 3, in actual implementation
40 equal realizations, for example, being equipped with PC tool software in PC machine 40, which can pass through serial ports and instruct acquisition display equipment
20 display device temperature, and control projector when temperature reaches preset value and start white balance calibration program.
Step S220: it sends driving instruction and drives the measuring device 30 to be initialized to measuring device 30 and acquire aobvious
Show picture.
Specifically, the white balance calibration system 10 provided based on the present embodiment carries out white balance in the display equipment 20
When detection or calibration, the measuring device 30 can be directly driven by the display equipment 20 and realizes initialization, and in the survey
Amount equipment 30 realizes corresponding data acquisition after initializing successfully, and measuring device 30 directly passes after collecting corresponding data
It is defeated by display equipment 20 to be handled, without carrying out data relay and processing by PC machine 40, so as to effectively save display
The calibration cost of the system maker of equipment 20, reduces the system complexity of white balance calibration system 10, while improving at data
Reason and interactive efficiency.
In addition, white flat by showing the data interaction between equipment 20 and measuring device 30 and handling realization in the present embodiment
Weighing apparatus calibration avoids the interface or display device producer firmware for needing heavy dependence such as digital light processing chip factory in the prior art
The problem of layout, may be implemented different chips and different display devices technical solution it is shared save cost without variation, can be with
For the use of projector complete system plant.
Step S230: xyz chrominance space matrix is obtained.
In the present embodiment, the xyz chrominance space matrix is that the measuring device 30 is based on XYZ coordinate system to collecting
The red, green, blue and white picture of the display equipment 20 handled to obtain.It should be understood that the XYZ coordinate system is 1931 by CIE
The coordinate system that ((Commission Internationale de L'Eclairage), International Commission on Illumination) formulates.
Specifically, it is assumed that the display equipment 20 is projector, and the measuring device 30 is illumination photometer, then in the throwing
When shadow instrument needs to carry out white balance calibration, the projector is displayed in red picture, green picture, blue picture and white and draws
Face, and the illumination photometer acquires the red picture, green picture, blue picture and white picture and based on XYZ coordinate system to it
It is analyzed, to obtain such as formulaShown in xyz chrominance space matrix, wherein (xr, yr, Lvr) table
Show that red chromaticity coordinates of the red picture under XYZ coordinate system, (xg, yg, Lvg) indicate that green picture is green under XYZ coordinate system
Color chromaticity coordinates, (xb, yb, Lvb) indicate that blue chromaticity coordinates of the blue picture under XYZ coordinate system, (xw, yw, Lvw) indicate white
White chromaticity coordinates of the picture under XYZ coordinate system.
Optionally, in order to further ensure that white balance calibration effect, the red picture, green picture, blue picture and
White picture be preferably the display equipment 20 show 100% red picture, 100% green picture, 100% blue picture and
100% white picture.
Step S240: being the rgb chrominance space matrix under RGB coordinate system by the xyz chrominance space matrix conversion.
Wherein, the RGB coordinate system is the coordinate system that CIE in 1931 is formulated.By the xyz chrominance space matrix conversion
Specifically step when for rgb chrominance space matrix can be the xyz chrominance space matrix obtained based on above-mentioned steps S230And apply formulaAnd formulaIt realizes, to obtain rgb chrominance space matrix
Step S250: based on the rgb chrominance space matrix to the gain register value in preset range traversed with
Choose the target white chromaticity coordinates for meeting default white balance conditions.In detail, in the present embodiment, the step S250 include with
Lower step.
Sub-step S2500: based on additive color principle and according to the rgb chrominance space matrixObtain Component Matrices of the red, green, blue three primary colours component under RGB coordinate systemWherein, [Rr Gr Br] represents red color of the red picture under RGB coordinate system and sits
Mark, [Rg Gg Bg] represent green chromaticity coordinates of the green picture under RGB coordinate system, and [Rb Gb Bb] represents blue picture and exist
Blue chromaticity coordinates under RGB coordinate system, [Rw Gw Bw] representative are calculated white based on collected xyz chrominance space matrix
Target white chromaticity coordinates of the color picture under RGB coordinate system；
Sub-step S2510: the rgb chrominance space matrix and the Component Matrices are based on, by formulaAnd formulaSubstitute into formulaAnd the gain register value is traversed within a preset range, wherein r, g, b generation respectively
Table red, the value of green and blue three primary colours, T represent the value of gain register, and it is bright under XYZ coordinate that Lv represents white picture
Degree；
Sub-step S2520: the target white chromaticity coordinates (x, y) for meeting default white balance conditions is chosen from traversing result.
In above-mentioned sub-step S2500- sub-step S2520,In T be gain register value, and the increasing
Beneficial register value can flexibly be set according to actual needs, for example, being based on the rgb chrominance space square in the present embodiment
When battle array traverses the gain register value in preset range, the preset range of T can be 0~255.In addition, in practical meter
During calculation, formulaIt can applyIt carries out
It is corresponding to calculate.
It is further noted that chosen according to traversing result meet default white balance conditions target white chromaticity coordinates (x,
Y) or when (x, y, Lv), the default white balance conditions may be, but not limited to, international standard or voluntarily make according to actual needs
It is fixed etc..
Step S260: according to the target white chromaticity coordinates to the ratio of the red, green, blue three primary colours in the white picture
It is adjusted to realize white balance calibration.
In the present embodiment, when S230 through the above steps to step S260 carries out white balance calibration, it is directly right to can be
The white balance of display equipment 20 is calibrated, and is also possible to detecting that it is pre- that the white picture of the display equipment 20 display is not met
If when white balance conditions, then being calibrated to it.For example, display equipment 20 obtains white first before carrying out white balance calibration
The corresponding white chromaticity coordinates of color picture, and analyze whether the white chromaticity coordinates meets default white balance conditions, if it is not, then executing step
Rapid S230.Wherein, the white chromaticity coordinates is that measuring device 30 analyze to white picture is collected based on XYZ coordinate system
It arrives.
Optionally, white balance calibration is carried out according to the white balance calibration method provided in the present embodiment, either aobvious
It is completed before showing the product exports such as equipment 20, is also possible to either be occurred in product use process according to client's self-demand white
Autonomous calibration is carried out by client when dysequilibrium to realize.In addition, in actual implementation, it is almost the same for same batch or parameter
Product, obtained calibration parameter, realizes the school to multiple products when can be according to white balance calibration to some product
Standard etc., the present embodiment is herein with no restrictions.
Further, through the above steps the description of S210- step S260, it is apparent that being provided in the present embodiment
To in the white balance calibration method of display equipment 20, all processing, control, adjustment process are by the display equipment 20
(chip being integrated in display equipment 20) is completed, such as is obtained to the control of measuring device 30, based on xyz chrominance space matrix
Meet the data processing of the target white chromaticity coordinates of default white balance conditions, its inside is controlled according to the target white chromaticity coordinates
Red, green, blue and white signal generator adjusts and generates the process etc. of certain proportion R-G-B signals.In addition, to three base of red, green, blue
During the ratio adjustment of color, the present embodiment obtains the data for acquiring equipment acquisition without repeating, but passes through measuring device 30
In the cycle calculations such as processing chip find out the target white chromaticity coordinates for meeting default white balance conditions, therefore, compared to
Prover time can be greatly shortened in the prior art, the white balance calibration method provided in the present embodiment, improve calibration efficiency, protect
Demonstrate,prove calibration accuracy.
Further, based on the description to above-mentioned white balance calibration method, the embodiment of the present invention also provides a kind of readable deposit
Storage media is stored with computer program on the readable storage medium storing program for executing, and the computer program is realized described above when being executed
Step in white balance calibration method, the specific sequence for executing step, the present embodiment is herein with no restrictions.
Further, referring to Fig. 5, to be provided in an embodiment of the present invention applied to the white of display equipment 20 shown in FIG. 1
Balance correction device 200, the white balance calibration device 200 include data acquisition module 210, space conversion module 220, parameter time
Go through module 230 and ratio adjustment module 240.
The data acquisition module 210, for obtaining xyz chrominance space matrix, which is to be based on
XYZ coordinate system is analyzed to obtain to collected red picture, green picture, blue picture and white picture；The present embodiment
In, the description as described in the data acquisition module 210 specifically refers to the detailed description to step S230 shown in Fig. 4,
That is, the step S230 can be executed by the data acquisition module 210.
The space conversion module 220, for being the rgb color under RGB coordinate system by the xyz chrominance space matrix conversion
Spend space matrix；In the present embodiment, the description as described in the space conversion module 220 is specifically referred to step shown in Fig. 4
The detailed description of rapid S240, that is, the step S240 can be executed by the space conversion module 220.
The parameter traversals module 230, for being deposited based on the rgb chrominance space matrix to the gain in preset range
Device value is traversed to choose the target white chromaticity coordinates for meeting default white balance conditions；In the present embodiment, about the parameter
The description of spider module 230 specifically refers to the detailed description to step S250 shown in Fig. 4, that is, the step S250
It can be executed by the parameter traversals module 230.Optionally, in the present embodiment, the parameter traversals module 230 includes calculating list
Member, Traversal Unit and coordinate selection unit.
The computing unit, for based on additive color principle and according to the rgb chrominance space matrixObtain Component Matrices of the red, green, blue three primary colours component under RGB coordinate systemWherein, [Rr Gr Br] represents red color of the red picture under RGB coordinate system and sits
Mark, [Rg Gg Bg] represent green chromaticity coordinates of the green picture under RGB coordinate system, and [Rb Gb Bb] represents blue picture and exist
Blue chromaticity coordinates under RGB coordinate system, [Rw Gw Bw] representative are calculated white based on collected xyz chrominance space matrix
Target white chromaticity coordinates of the color picture under RGB coordinate system；In the present embodiment, description can specifically be joined as described in the computing unit
The detailed description of above-mentioned steps S2500 is examined, that is, the step S2500 can be executed by the computing unit.
The Traversal Unit, for being based on the rgb chrominance space matrix and the Component Matrices, by formulaAnd formulaSubstitute into formulaAnd the gain register value is traversed within a preset range, wherein r, g, b are respectively represented
Red, green and blue three primary colours values, T represent the value of gain register, and it is bright under XYZ coordinate that Lv represents white picture
Degree；In the present embodiment, the description as described in the Traversal Unit specifically refers to the detailed description of above-mentioned steps S2510, that is, institute
Stating step S2510 can be executed by the Traversal Unit.
The coordinate selection unit, for choosing the target white color seat for meeting default white balance conditions from traversing result
It marks (x, y).In the present embodiment, the description as described in the coordinate selection unit specifically refers to retouching in detail for above-mentioned steps S2520
It states, that is, the step S2520 can be executed by the coordinate selection unit.
The ratio adjusts module 240, for according to the target white chromaticity coordinates in the white picture it is red,
The ratio of green, blue three primary colours is adjusted to realize white balance calibration.In the present embodiment, module 240 is adjusted about the ratio
Description specifically refer to the detailed description to step S260 shown in Fig. 4, that is, the step S260 can be by the ratio
Example adjustment module 240 executes.
In conclusion the embodiment of the present invention provides a kind of white balance calibration methods, devices and systems, wherein based on to aobvious
Show that the analysis result of the display picture of equipment 20 realizes the traversal to gain register value to obtain the mesh for meeting white balance conditions
White chromaticity coordinates is marked, and is realized according to the target white chromaticity coordinates and the ratio of the red, green, blue three primary colours in white picture is carried out
Adjustment reaches white balance calibration, can effectively ensure that the stability and uniformity of white balance calibration result, is less prone to picture colour cast
The problems such as.Meanwhile present invention also avoids display equipment 20 system maker when carrying out white balance calibration to it to other
The dependence of display device producer, so that the white balance calibration of display equipment 20 has independence and flexibility.
In addition, for different type, the display equipment 20 of different model, white balance calibration method that the present invention provides, dress
Setting has stronger universality with system, and realizes simply, calibrates at low cost, calibration accuracy height.
In several embodiments provided by the embodiment of the present invention, it should be understood that disclosed method and apparatus, it can also
To realize by another way.System and method embodiment described above is only schematical, for example, in attached drawing
Flow chart and block diagram show that the systems of multiple embodiments according to the present invention, method and computer program product are able to achieve
Architecture, function and operation.In this regard, each box in flowchart or block diagram can represent module, a program
A part of section or code, a part of the module, section or code include that one or more is patrolled for realizing defined
Collect the executable instruction of function.It should also be noted that in some implementations as replacement, function marked in the box
It can occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually be held substantially in parallel
Row, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that block diagram and/or
The combination of each box in flow chart and the box in block diagram and or flow chart, can the function as defined in executing or dynamic
The dedicated hardware based system made is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, electronic equipment or network equipment etc.) execute all or part of step of each embodiment the method for the present invention
Suddenly.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), deposits at random
The various media that can store program code such as access to memory (RAM, Random Access Memory), magnetic or disk.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of white balance calibration method, which is characterized in that the described method includes:
Obtain xyz chrominance space matrix, which is based on XYZ coordinate system to collected red picture, green
Color picture, blue picture and white picture are analyzed to obtain；
By the rgb chrominance space matrix that the xyz chrominance space matrix conversion is under RGB coordinate system；
Based on the rgb chrominance space matrix to the gain register value in preset range traversed with choose meet preset it is white
The target white chromaticity coordinates of equilibrium condition；
It is adjusted according to ratio of the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture with reality
Existing white balance calibration.
2. white balance calibration method according to claim 1, which is characterized in that be based on the rgb chrominance space matrix pair
Gain register value in preset range is traversed to choose the step for the target white chromaticity coordinates for meeting default white balance conditions
Suddenly include:
Based on additive color principle and according to the rgb chrominance space matrixObtain it is red, green,
Component Matrices of the blue three primary colours component under RGB coordinate systemWherein, [Rr Gr Br]
Red chromaticity coordinates of the red picture under RGB coordinate system is represented, it is green under RGB coordinate system that [Rg Gg Bg] represents green picture
Color chromaticity coordinates, [Rb Gb Bb] represent blue chromaticity coordinates of the blue picture under RGB coordinate system, and [Rw Gw Bw], which is represented, to be based on adopting
Target white chromaticity coordinates of the white picture that the xyz chrominance space matrix collected is calculated under RGB coordinate system；
Based on the rgb chrominance space matrix and the Component Matrices, by formula
And formula
Substitute into formulaAnd the gain register value is traversed within a preset range, wherein r, g, b
Red, green and blue three primary colours values are respectively represented, T represents the value of gain register, and Lv represents white picture in XYZ coordinate
Under brightness；
The target white chromaticity coordinates (x, y) for meeting default white balance conditions is chosen from traversing result.
3. white balance calibration method according to claim 1, which is characterized in that the red picture, green picture, blue
Picture and white picture be show equipment show 100% red picture, 100% green picture, 100% blue picture and
100% white picture.
4. white balance calibration method according to claim 1, which is characterized in that the method also includes:
The corresponding white chromaticity coordinates of white picture is obtained, and analyzes whether the white chromaticity coordinates meets default white balance conditions,
In, the white chromaticity coordinates is to be analyzed to obtain to white picture is collected based on XYZ coordinate system；
Be based on XYZ coordinate system if it is not, then executing, to collected red picture, green picture, blue picture and white picture into
The step of row analysis obtains xyz chrominance space matrix.
5. white balance calibration method according to claim 4, which is characterized in that the method also includes:
It obtains display device temperature and judges whether the temperature reaches preset value, and execute and obtain when the temperature reaches preset value
The step of extracting waste picture corresponding white chromaticity coordinates.
6. white balance calibration method according to claim 1, which is characterized in that in the step for obtaining xyz chrominance space matrix
Before rapid, the method also includes:
Driving instruction is sent to drive the measuring device to be initialized to measuring device and acquire display picture.
7. a kind of white balance calibration device, which is characterized in that described device includes:
Module is obtained, for obtaining xyz chrominance space matrix, which is based on XYZ coordinate system to collecting
Red picture, green picture, blue picture and white picture analyzed to obtain；
Space conversion module, for being the rgb chrominance space matrix under RGB coordinate system by the xyz chrominance space matrix conversion；
Parameter traversals module, for based on the rgb chrominance space matrix in preset range gain register value carry out time
It goes through to choose the target white chromaticity coordinates for meeting default white balance conditions；
Ratio adjust module, for according to the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture
Ratio is adjusted to realize white balance calibration.
8. white balance calibration device according to claim 7, which is characterized in that the parameter traversals module includes:
Computing unit, for based on additive color principle and according to the rgb chrominance space matrixObtain Component Matrices of the red, green, blue three primary colours component under RGB coordinate systemWherein, [Rr Gr Br] represents red color of the red picture under RGB coordinate system
Coordinate, [Rg Gg Bg] represent green chromaticity coordinates of the green picture under RGB coordinate system, and [Rb Gb Bb] represents blue picture and exist
Blue chromaticity coordinates under RGB coordinate system, [Rw Gw Bw] representative are calculated white based on collected xyz chrominance space matrix
Target white chromaticity coordinates of the color picture under RGB coordinate system；
Traversal Unit, for being based on the rgb chrominance space matrix and the Component Matrices, by formulaAnd formulaIt substitutes into public
FormulaAnd the gain register value is traversed within a preset range, wherein r, g, b generation respectively
Table red, the value of green and blue three primary colours, T represent the value of gain register, and it is bright under XYZ coordinate that Lv represents white picture
Degree；
Coordinate selection unit, for choosing the target white chromaticity coordinates (x, y) for meeting default white balance conditions from traversing result.
9. a kind of white balance calibration system, which is characterized in that the white balance calibration system includes measuring device and display equipment；
The display equipment is for being displayed in red picture, green picture, blue picture and white picture；
The measuring device is used to obtain red picture, green picture, blue picture and the white picture that the display equipment is shown,
And the red picture, green picture, blue picture and white picture are analyzed to generate xyz coloration based on XYZ coordinate system
Space matrix；
The display equipment is used to receive the xyz chrominance space matrix that the measuring device is sent, and by the xyz chrominance space square
Battle array is converted to the rgb chrominance space matrix under RGB coordinate system；
The display equipment is also used to based on the rgb chrominance space matrix to the gain register value progress time in preset range
It goes through to choose the target white chromaticity coordinates for meeting default white balance conditions；
It is adjusted according to ratio of the target white chromaticity coordinates to the red, green, blue three primary colours in the white picture to realize
White balance calibration.
10. white balance calibration system according to claim 9, which is characterized in that
The display equipment is also used to send driving instruction to the measuring device to drive the measuring device to be initialized；
The measuring device is used to acquire the display picture of the display equipment after the completion of initialization and is sent to the display
Equipment.
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| CN108426186B (en) * | 2018-03-14 | 2020-05-22 | 调调（北京）科技有限公司 | Lamp color calibration method and device and electronic equipment |
| CN109067563B (en) * | 2018-06-28 | 2021-06-18 | 瑞芯微电子股份有限公司 | Self-adaptive adjustment method and system for Ethernet parameters |
| CN109410874B (en) * | 2018-12-17 | 2021-04-23 | 惠科股份有限公司 | Method and device for converting three-color data into four-color data |
| CN109903735B (en) * | 2019-01-29 | 2021-01-22 | 广州视源电子科技股份有限公司 | Display calibration method, device, system, computer equipment and storage medium |
| CN110491348A (en) * | 2019-07-31 | 2019-11-22 | 惠州市德赛西威汽车电子股份有限公司 | A kind of display screen white balance adjusting method and its system |
| CN114999414A (en) * | 2022-04-21 | 2022-09-02 | 华兴源创(成都)科技有限公司 | Display compensation method, computer device, and medium |
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