CN107146565A - The method and device of gamma curve based on DICOM calibration curve displays - Google Patents
The method and device of gamma curve based on DICOM calibration curve displays Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
A kind of method and device of the gamma curve based on DICOM calibration curve displays, methods described includes, display is corrected at interval of the R under m grades of grey menu, G, B parameter, the step of R, G, B parameter are corrected includes：The x, y, Y value of the current gray picture shown in the display that sensor is read are obtained, x, y value is color temperature coordinate value, and the Y value is brightness value；Calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, and judge whether the difference is respectively less than or equal to corresponding threshold value, target x, the y value is the color temperature value of standard under preset color temperature, and the target Y value is the corresponding brightness value of current gray on dicom standard curve；If it is not, according to the mathematic interpolation R, G, B parameter increment, and according to the R, G, B parameter incremental correction display R, G, B parameter, and return to first step.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of Gamma based on DICOM calibration curve displays
The method and device of curve.
Background technology
High-resolution high brightness indicator used in medical display and medical industry, applied to various digital image apparatus such as
DR, CR, Multi-section CT, 3D rendering.Research shows that the eyes of the mankind have obvious difference for the resolution capability of different brightness,
Traditional many experiments statistics, specification has gone out the gray-scale intensity curve of an international standard, that is, is referred to as standard
DICOM curves.By the way that vision is incorporated into the response change of brightness during the image of professional medical display shows, doctor is improved
The raw diagnosis capability to focus in medical image.The medical display of general specialty must support DICOM PART14 standard,
That is must possess the ability of adjustment gamma curve, itself and dicom standard is matched, so as to ensure the display of image
Quality.
For the inspection correction of traditional standard gray scale display output, medical Professional display monitor typically passes through professional's hand
Dynamic correction or the automatic calibration of built-in correction meter.Wherein, manual correction is higher to the technical requirements of personnel, and the result people of correction
More for factor, accuracy is poor；And the built-in automatic correction of correction meter uses color mainly by showing tetra- kinds of pictures of R, G, B, W
Analyzer reads the chromaticity coordinates of this four pictures, is then once calculated to obtain desired value, so calibrates obtained DICOM
Curve is very coarse, it is impossible to accurate calibration display.
The content of the invention
In view of above-mentioned condition, it is necessary to which the gamma curve for display in the prior art is unable to accurate calibration problem, carries
For a kind of method of the gamma curve based on DICOM calibration curve displays.
A kind of method of the gamma curve based on DICOM calibration curve displays, including,
Display is corrected at interval of the R under m grades of grey menu, G, B parameter, what the R, G, B parameter were corrected
Step includes：
The x, y, Y value of the current gray picture shown in the display that sensor is read are obtained, x, y value is sat for colour temperature
Scale value, the Y value is brightness value；
Calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, and judge that the difference is
No to be respectively less than or equal to corresponding threshold value, target x, the y value is the color temperature value of standard under preset color temperature, and the target Y value is
The corresponding brightness value of current gray on dicom standard curve；
If it is not, showing according to the mathematic interpolation R, G, B parameter increment, and according to the R, G, B parameter incremental correction
Show the R, G, B parameter of device, and return to step：Obtain x, y, Y of the current gray picture shown in the display that sensor is read
Value.
The above method, wherein, it is described that display is corrected at interval of the R under m grades of grey menu, G, B parameter
Also include before step：
Driving display sequentially shows the grey menu at interval of m grades, so that sensor is sequentially read in the display
The x of each grey menu of display, y, Y value.
The above method, wherein, it is described according to the mathematic interpolation R, G, B parameter increment, and increased according to the R, G, B parameter
The step of amount corrects the R, G, B parameter of the display includes：
The R parameter increment according to the mathematic interpolation of the x values of the current gray picture and the target x values, and according to
The R parameter of display described in the R parameter incremental correction；
The B parameter increment according to the mathematic interpolation of the y values of the current gray picture and the target y values, and according to
The B parameter of display described in the B parameter incremental correction；
The G parameter increases according to the mathematic interpolation of the Y value of the current gray picture and the target Y value, and according to
The G parameter increases correct the G parameters of the display.
The above method, wherein, the preset color temperature is 9300K, and target x, the y value is respectively 0.285,0.293.
The above method, wherein, it is characterised in that m is 0 or 1.
The embodiment of the present invention additionally provides a kind of device of the gamma curve based on DICOM calibration curve displays, is used for
Display is corrected at interval of the R under m grades of grey menu, G, B parameter, including：
The x of the current gray picture shown in acquisition module, the display for obtaining sensor reading, y, Y value, it is described
X, y value are color temperature coordinate value, and the Y value is brightness value；
Computing module, for calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, institute
Color temperature value of target x, the y value for standard under preset color temperature is stated, the target Y value is current gray correspondence on dicom standard curve
Brightness value；
Judge module, for judging whether the difference is respectively less than or equal to corresponding threshold value；
Correction module, for when at least one is not less than or equal to corresponding threshold value when the difference, according to the difference
Value calculates R, G, B parameter increment, and according to the R, G, B parameter incremental correction display R, G, B parameter, and obtain biography
The x of the current gray picture shown in the display that sensor is read, y, Y value.
Said apparatus also includes：
Drive module, for driving display sequentially to show the grey menu at interval of m grades, so that sensor is sequentially read
The x of each grey menu shown in the display, y, Y value.
Said apparatus, wherein, the correction module specifically for：
The R parameter increment according to the mathematic interpolation of the x values of the current gray picture and the target x values, and according to
The R parameter of display described in the R parameter incremental correction；
The B parameter increment according to the mathematic interpolation of the y values of the current gray picture and the target y values, and according to
The B parameter of display described in the B parameter incremental correction；
The G parameter increases according to the mathematic interpolation of the Y value of the current gray picture and the target Y value, and according to
The G parameter increases correct the G parameters of the display.
Said apparatus, wherein, the preset color temperature is 9300K, and target x, the y value is respectively 0.285,0.293.
Said apparatus, wherein, m is 0 or 1.
The embodiment of the present invention carries out R, G, B parameter by the equally spaced grey menu shown to display and corrects and correct
Confirm, the gamma curve after the display calibration of display in certain error range, is reached relative to DICOM curves
The purpose of accurate calibration.That is, R, G, B of current gray picture are carried out after primary parameter correction, the sensor that need to be judged is again
Whether the x of the current gray picture of detection, y, Y value are respectively less than or equal to corresponding threshold with the difference of corresponding standard x, y, Y value
Value, if it is not, then the R, G, B parameter of current gray picture are corrected again x, y, Y value until current gray picture with it is right
Whether the standard x that answers, y, the difference of Y value are respectively less than or equal to corresponding threshold value.
Brief description of the drawings
The method stream for the gamma curve based on DICOM calibration curve displays that Fig. 1 provides for first embodiment of the invention
Cheng Tu；
The method stream for the gamma curve based on DICOM calibration curve displays that Fig. 2 provides for second embodiment of the invention
Cheng Tu；
The device for the gamma curve based on DICOM calibration curve displays that Fig. 3 provides for third embodiment of the invention
Structured flowchart.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
With reference to following description and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.In these descriptions
In accompanying drawing, some particular implementations in embodiments of the invention are specifically disclosed, to represent the implementation for implementing the present invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention
Embodiment includes all changes, modification and the equivalent fallen into the range of the spirit and intension of attached claims.
Referring to Fig. 1, being the gamma curve based on DICOM calibration curve displays in first embodiment of the invention
Method, including, display is corrected at interval of the R under m grades of grey menu, G, B parameter, the R, G, B parameter correction
The step of include：
Step S11, obtains the x, y, Y value, x, y value of the current gray picture shown in the display that sensor is read
For color temperature coordinate value, the Y value is brightness value.
Display described in above-mentioned steps is display used in Medical Devices, is set before the screen of the display
There is sensor, colour temperature coordinate x, y and brightness Y for detecting screen-picture, the sensor can use RGB sensors.
Because medical display needs to meet DICOM part14 standard, this standard specifies 0~4000cd/m2It is bright
All brightness separations (JND) that human eye can be differentiated in the range of degree, one gray scale levels of each brightness separation correspondence.Ideally
It is required that the brightness of each grey menu of display is consistent with the brightness of correspondence GTG on DICOM part14 standard curves, it is real
When border is operated, it is only necessary to control the gray-scale intensity curve (gamma curve) of display in certain error range.And
And the colour temperature of each grey menu needs to be consistent, for example, preset color temperature is 9300K, then the mark for having a grey menu
Quasi- colour temperature coordinate is x=0.285, y=0.293.The number of levels of the brightness of the series correspondence display of GTG, for example, color depth
For 8bit displays, the level of 256 brightness is had, correspondence 256 grey menus, i.e., 0 grade, 1 grade ... 255 grades of GTG are drawn
Face.R, G, B parameter are carried out to display at interval of m grades of grey menu to correct, m value is according to the speed and accuracy of calibration
It is required that determining, its span is 0~n, and n is the sum of the grey menu of display.M is that 0, i.e. color depth are in the present embodiment
8bit displays, from 0 grade of GTG to 255 grades of grey menus, school is carried out to the display R under every one-level grey menu, G, B parameter
Just, the gamma curve of display is made mutually to approach the DICOM curves of standard.
Certainly, in another embodiment of the present invention, m can also be 1, i.e., carry out primary parameter school at interval of 1 gray scale levels
Just, i.e., 0 grade, 2 grades, 4 grades ... 254 grades.For the higher display of color bits depth value, carried out at interval of 1 gray scale levels
Primary parameter correction both can guarantee that the accuracy of gamma curve correction, can also improve correction rate.
Step S12, calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, and judge institute
State whether difference is respectively less than or equal to corresponding threshold value, step S13 is performed if not, if performing step S14.Target x, y
It is worth for the color temperature value of standard under preset color temperature, the target Y value is the corresponding brightness value of current gray on dicom standard curve.
Step S13, according to the mathematic interpolation R, G, B parameter increment, and according to the R, G, B parameter incremental correction
R, G, the B parameter of display, and return to step S11.
Influence the colour temperature of display picture and the R, G, the B parameter that mainly there are tri- parameters of R, G, B, change display of brightness
The x of on-screen displays, y, Y value can be influenceed.By sensor detect the x, y, Y value of each grey menu and corresponding standard x,
Y, Y value difference, and obtain R, G, B parameter increment according to three mathematic interpolations.Under each grey menu obtained according to calculating
R, G, R, G, the B parameter of B parameter incremental correction display so that the gamma curve of display is bent relative to the DICOM of standard
For line, in certain error range.
Because GTG and brightness are not typically linear relationship, once correction is cannot pass through per one-level grey menu and reaches standard
It is required that, so each grey menu, display may be needed by multiple parameter correction.Every time after correction R, G, B parameter,
The x of the current gray picture of display, y, Y value change accordingly, until the x of current gray picture, y, Y value and target x, y, Y
The difference of value completes the parameter correction of current gray picture when being less than or equal to correspondence threshold value, and enters the school of next grey menu
Just.
Step S14, terminates R, G, the B parameter correction of current gray picture.R, G, the B parameter of current picture can after having corrected
Carry out R, G, the B parameter correction of next grey menu.
In the present embodiment, the equally spaced grey menu shown to display carries out R, G, B parameter correction and correction and confirmed.
That is, R, G, B of current gray picture are carried out after primary parameter correction, the current gray that the sensor that need to be judged is detected again is drawn
Whether the x in face, y, Y value are respectively less than or equal to corresponding threshold value with the difference of corresponding standard x, y, Y value, if it is not, then right again
R, G, the B parameter of current gray picture are corrected x, y, Y value until current gray picture and corresponding standard x, y, Y value
Difference is respectively less than or equal to corresponding threshold value.The present embodiment corrects R, G, B ginseng of display by way of circulating correction, detection
Number, makes the gamma curve of display in certain error range, reaches the purpose of accurate calibration.
Referring to Fig. 2, being the gamma curve based on DICOM calibration curve displays in second embodiment of the invention
Method, including step S21~S25.
Step S21, driving display shows i-stage grey menu, so that sensor reads what is shown in the display
The x of i-stage grey menu, y, Y value, i initial values are 0.X, y value is color temperature coordinate value, and the Y value is brightness value.
Step S22, obtains the x, y, Y value of i-stage grey menu.
The method of the gamma curve based on DICOM calibration curve displays in the present embodiment is applied in terminal, described
Terminal is connected with the display and sensor.Terminal is, for example, computer, flat board etc., for driving screen, shows each GTG
Picture and the signal for obtaining sensor detection.
Step S23, calculates the i-stage grey menu x, y, Y value and target x, y, the difference of Y value, and judge the difference
Whether value is respectively less than or equal to corresponding threshold value, step S24 is performed if not, if performing step S25.Target x, the y value is
The color temperature value of standard under preset color temperature, the target Y value is the corresponding brightness value of i-stage GTG on dicom standard curve.
Step S24, according to the mathematic interpolation R, G, B parameter increment, and according to the R, G, B parameter incremental correction
R, G, the B parameter of display, and return to step S21.
R parameter mainly influences x values in colour temperature, increases △ R under current gray picture, and the R parameter for obtaining display changes
It is afterwards △ x with the difference of x before change, the colour temperature x of display R parameter and current gray picture under current gray picture is obtained with this
The variation relation of value.G parameters mainly influence luminance y value, increase △ G under current gray picture, and the G parameters for obtaining display change
After change with change before Y difference into △ Y, the bright of display G parameters and current gray picture under current gray picture is obtained with this
Spend the variation relation of Y value.B parameter mainly influences y values in colour temperature, increases △ B under current gray picture, obtains the B of display
With the difference △ y of y before change after parameter change, display B parameter and current gray picture under current gray picture are obtained with this
Colour temperature y values variation relation.
In above-mentioned steps, the R parameter according to the mathematic interpolation of the x values of the i-stage grey menu and the target x values
Increment, and according to the R parameter increment amendment display R parameter.Due to the change of parameter R increment and color temperature value x
In certain relation, when x values and the difference of the target x values that i-stage grey menu is determined, you can determine R parameter increment.
The B parameter increment according to the mathematic interpolation of the y values of the i-stage grey menu and the target y values, according to institute
State the B parameter of display described in B parameter increment amendment.Because the change of parameter B increment and color temperature value y is in certain relation,
As y and the difference of the target y values that i-stage grey menu is determined, you can determine B parameter increment.
The G parameter increases according to the Y of the i-stage grey menu and the mathematic interpolation of the target Y value, and according to institute
State the G parameters of display described in G parameter increase amendments.Due to, the change of parameter G increment and color temperature value Y is in certain relation,
When Y value and the difference of the target Y value that i-stage grey menu is determined, you can determine G parameter increases.
During according to R, G, the R of B parameter incremental correction display, G, B parameter, it is if calculating obtained R, G, B parameter increment
On the occasion of then the R of display, G, B parameter accordingly increase the increment；If negative value, R, G, B parameter reduce the increment accordingly.
Step S25, whether i is equal to n, if performing step S26, otherwise performs step S27, wherein, n is the ash of display
The sum of rank picture.
Step S26, return to step S11 after series i adds 1.
In the R of display, G, B parameter trimming process, the several evidences of bay level for the grey menu that driving display show are aobvious
Show that the color depth of device, and the speed and precise requirements of calibration are determined.In the present embodiment, series i adds 1, i.e., continuous to display
R, G, B parameter under the grey menu of series are corrected.It is appreciated that in the other embodiment of the present invention, i can also add 2,
Display is corrected at interval of the R under 1 grade of grey menu, G, B parameter.
Step S27, terminates calibration.
The present embodiment sequentially shows each grey menu by driving display, and sequentially to the R of each grey menu, G,
B parameter is corrected, and is made the DICOM curves of display in certain error range, is reached the purpose of accurate calibration.
Referring to Fig. 3, being the gamma curve based on DICOM calibration curve displays in third embodiment of the invention
Device, for being corrected to display at interval of the R under m grades of grey menu, G, B parameter, including acquisition module 10, calculating
Module 20, judge module 30 and correction module 40.
The acquisition module 10 is used for x, y, the Y for obtaining the current gray picture shown in the display that sensor is read
Value, x, y value is color temperature coordinate value, and the Y value is brightness value.
Further, in addition to：
Drive module, for driving display sequentially to show the grey menu at interval of m grades, so that sensor is sequentially read
The x of each grey menu shown in the display, y, Y value.
The computing module 20 be used to calculating the x, y, Y value of the current gray picture respectively with target x, y, Y value difference
Value, target x, the y value is the color temperature value of standard under preset color temperature, and the target Y value is current gray on dicom standard curve
Corresponding brightness value.
Further, the preset color temperature is 9300K, and target x, the y value is respectively 0.285,0.293.
The judge module 30 is used to judge whether the difference is respectively less than or equal to corresponding threshold value.
The correction module 40 is for when when the difference, at least one is not less than or equal to corresponding threshold value, according to institute
State mathematic interpolation R, G, B parameter increment, and according to the R, G, B parameter incremental correction display R, G, B parameter, and obtain
The x of the current gray picture shown in the display for taking sensor reading, y, Y value.
Specifically, the correction module is used for：
The R parameter increment according to the mathematic interpolation of the x values of the current gray picture and the target x values, and according to
The R parameter of display described in the R parameter incremental correction；
The B parameter increment according to the mathematic interpolation of the y values of the current gray picture and the target y values, and according to
The B parameter of display described in the B parameter incremental correction；
The G parameter increases according to the mathematic interpolation of the Y value of the current gray picture and the target Y value, and according to
The G parameter increases correct the G parameters of the display.
Further, m is 1 or 2.
In the present embodiment, the x of the current gray picture shown in the display read by acquisition module acquisition sensor,
Y, Y value, and current gray picture x, y, Y value and target x, y, the difference of Y value are calculated by computing module respectively.By judging mould
Block judges whether current gray picture x, y, Y value and the difference of target x, y, Y value are respectively less than or equal to corresponding threshold value, if otherwise
R, G, B value to display is corrected.The x, y, Y value of current gray picture are obtained after correction again, and judges current gray
Whether picture x, y, Y value and target x, y, the difference of Y value are respectively less than or equal to corresponding threshold value, if it is not, R then to display,
G, B value are corrected again, until current gray picture x, y, Y value are respectively less than or equal to corresponding with the difference of target x, y, Y value
Next grey menu is corrected during threshold value.The present embodiment passes through R, G, B under each grey menu for being shown to display
Parameter is corrected, and is made the gamma curve of display relative to standard DICOM curves in certain error range, is reached essence
The purpose really calibrated.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.
The more specifically example (non-exhaustive list) of computer-readable medium includes following：With one or more wirings
Electrical connection section (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can in memory and by suitable instruction execution system be performed with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method of the gamma curve based on DICOM calibration curve displays, it is characterised in that including,
Display is corrected at interval of the R under m grades of grey menu, G, B parameter, the step of R, G, B parameter are corrected
Including：
The x, y, Y value of the current gray picture shown in the display that sensor is read are obtained, x, y value is colour temperature coordinate
Value, the Y value is brightness value；
Calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, and judge whether the difference equal
Less than or equal to corresponding threshold value, target x, the y value is the color temperature value of standard under preset color temperature, and the target Y value is DICOM
The corresponding brightness value of current gray on standard curve；
If it is not, according to the mathematic interpolation R, G, B parameter increment, and the display according to the R, G, B parameter incremental correction
R, G, B parameter, and return to step：Obtain the x, y, Y value of the current gray picture shown in the display that sensor is read.
2. the method as described in claim 1, it is characterised in that it is described to display at interval of the R under m grades of grey menu,
Also include before the step of G, B parameter are corrected：
Driving display sequentially shows the grey menu at interval of m grades, is shown so that sensor is sequentially read in the display
The x of each grey menu, y, Y value.
3. the method as described in claim 1, it is characterised in that described according to the mathematic interpolation R, G, B parameter increment, and root
According to including described in the R, G, B parameter incremental correction the step of the R of display, G, B parameter：
The R parameter increment according to the mathematic interpolation of the x values of the current gray picture and the target x values, and according to the R
Parameter increase corrects the R parameter of the display；
The B parameter increment according to the mathematic interpolation of the y values of the current gray picture and the target y values, and according to the B
Parameter increase corrects the B parameter of the display；
The G parameter increases according to the mathematic interpolation of the Y value of the current gray picture and the target Y value, and according to the G
Parameter increase corrects the G parameters of the display.
4. the method as described in claim 1, it is characterised in that the preset color temperature is 9300K, target x, the y value difference
For 0.285,0.293.
5. the method as described in claim 1, it is characterised in that m is 0 or 1.
6. a kind of device of the gamma curve based on DICOM calibration curve displays, it is characterised in that for every to display
R, G, B parameter under the grey menu at m grades of interval are corrected, including：
The x of the current gray picture shown in acquisition module, the display for obtaining sensor reading, y, Y value, described x, y
It is worth for color temperature coordinate value, the Y value is brightness value；
Computing module, for calculate the x, y, Y value of the current gray picture respectively with target x, y, Y value difference, the mesh
The color temperature value that x, y value are standard under preset color temperature is marked, the target Y value is that current gray is corresponding bright on dicom standard curve
Angle value；
Judge module, for judging whether the difference is respectively less than or equal to corresponding threshold value；
Correction module, for when at least one is not less than or equal to corresponding threshold value when the difference, according to the difference meter
Calculate R, G, B parameter increment, and according to the R, G, B parameter incremental correction display R, G, B parameter, and obtain sensor
The x of the current gray picture shown in the display of reading, y, Y value.
7. device as claimed in claim 6, it is characterised in that also include：
Drive module, for driving display sequentially to show the grey menu at interval of m grades so that sensor sequentially read it is described
The x of each grey menu shown in display, y, Y value.
8. device as claimed in claim 6, it is characterised in that the correction module specifically for：
The R parameter increment according to the mathematic interpolation of the x values of the current gray picture and the target x values, and according to the R
Parameter increase corrects the R parameter of the display；
The B parameter increment according to the mathematic interpolation of the y values of the current gray picture and the target y values, and according to the B
Parameter increase corrects the B parameter of the display；
The G parameter increases according to the mathematic interpolation of the Y value of the current gray picture and the target Y value, and according to the G
Parameter increase corrects the G parameters of the display.
9. device as claimed in claim 6, it is characterised in that the preset color temperature is 9300K, target x, the y value difference
For 0.285,0.293.
10. device as claimed in claim 6, it is characterised in that m is 0 or 1.
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