CN106531060A - Luminance correcting method and device for LED display device - Google Patents
Luminance correcting method and device for LED display device Download PDFInfo
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- CN106531060A CN106531060A CN201611009736.0A CN201611009736A CN106531060A CN 106531060 A CN106531060 A CN 106531060A CN 201611009736 A CN201611009736 A CN 201611009736A CN 106531060 A CN106531060 A CN 106531060A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
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Abstract
The invention provides a luminance correcting method for an LED display device and a corresponding luminance correcting device. The luminance correcting method comprises the following steps: (i) acquiring a plurality of groups of original luminance values of the LED display device; (ii) by utilizing an objective function relevant to a luminance correction coefficient, the original luminance and the target luminance and taking the value range of the luminance correction coefficient as the constraint condition, acquiring the luminance correcting coefficient corresponding to the minimal objective function value when each group of original luminance value and the set target luminance value are substituted into the objective function; and (iii) uploading and storing the acquired luminance correction coefficient in control system hardware of the LED display device. According to the method and the device, by utilizing the constraint condition, the color component correction coefficient corresponding to the minimal objective function is calculated, then the nearest-neighbor point which can be achieved is found in the three-dimensional space, thus the color which can be realized is approximate to the target luminance value as far as possible, and the display effect is good.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of bearing calibration of LED display bright chroma and one kind
LED display bright chroma means for correcting.
Background technology
Since 21 century, show industry developed on an unprecedented scale, LED display also spread all over all cities central plaza,
Commercial mansion.LED display with its it is distinctive bright in luster, visual high, low in energy consumption the advantages of enjoy people's favorable comment, but by
It is relatively low in current LED display manufacturing technology level so that the LED lamp tube produced itself has larger bright chroma difference
(such as same production batch LED, its brightness may differ by nearly 50%, and colourity may differ by 15～20nm), and it is multiple different raw
The display screen of batch LED splicing is produced, its bright chroma difference is just more serious.These bright chroma differences are for human eye vision
It is intolerable, so LED display that is new production or using year in year out needs to carry out effective bright chroma regulation.
At present in LED display industry for there is bright chroma difference LED display processing mode mainly using camera,
The measuring apparatus such as chromascope are corrected to display screen with reference to point-to-point correction system, eliminate the bright chroma difference between LED point,
Reach the high uniformity uniformity of display screen bright chroma.Wherein, it is one of important step therein to calculate correction coefficient, it is assumed that used
XYZTRepresent the target light tone angle value of RGB, XYZOThe original light tone angle value of RGB is represented, Coef is corresponding correction system
Count, then XYZT=Coef*XYZO, so as to Coef=XYZT*(XYZO)-1。
In practice, the colour gamut of correction target value may require that, but the desired value that LED point can be realized can only
Positioned at its own original color gamut triangle interior.Otherwise the LED point is unable to reach desired value, and which can have one to effect after correction
Fixing to ring, such as uniformity has declined.
As shown in figure 1, colour triangle C1 is the original chromaticity coordinates R (red) of LED, G (green), the corresponding original color gamuts of B (indigo plant)
Triangle, colour triangle C2 is the corresponding target color gamut triangle of LED target color coordinates of setting, namely target color gamut triangle
At least one summit (such as a summit in Fig. 1 is also likely to be two even three summits certainly) of shape C2 is positioned at original
Outside beginning colour triangle C1；It can be seen that the green chromaticity coordinates G of the LED can not reach desired value by correction.
The problem of chromaticity correction desired value cannot be realized in prior art for LED, which is found from desired value in colour gamut
The nearest chromaticity coordinates that can be reached.As shown in Fig. 2 original chromaticity coordinates of the RGB for LED RGBs, E points are which is to be realized green
Color chromaticity coordinates desired value；D points are the attainable green chromaticity coordinates of the LED, and which is closest from green chromaticity coordinates desired value, namely
For the intersection point on green chromaticity coordinates desired value one side on original color gamut triangle.
However, aforementioned prior art is simply found from the nearest lamp point of desired value on chromaticity coordinates, which is located on bidimensional
Reason, not in view of this dimension of luminance component.
The content of the invention
Therefore, the present invention finds the closest point that can be reached in three-dimensional by the light tone angle value in view of LED, from
And achieved color is caused as close as target light tone angle value, and then cause display effect more preferable.
Specifically, the embodiment of the present invention proposes a kind of LED display bright chroma bearing calibration, and which includes step：I () is obtained
Take the multigroup original light tone angle value of LED display；(ii) utilize and be relevant to bright chroma correction coefficient, original bright chroma and target
The object function of bright chroma and using the span of the bright chroma correction coefficient as constraints, obtain described in each group
Corresponding light tone when target function value is minimum when the target light tone angle value of original light tone angle value and setting substitutes into the object function
Degree correction coefficient；And the bright chroma correction coefficient of acquisition is uploaded and is stored to the control system of the LED display by (iii)
System hardware.
In one embodiment of the invention, LED display bright chroma bearing calibration was also wrapped before step (i)
Include step：The light tone degrees of data of the LED display primary colours is gathered using image capture device.
In one embodiment of the invention, LED display bright chroma bearing calibration was gone back before step (ii)
Including step：Set the target light tone angle value and the chromatic value in making the target light tone angle value corresponding to target color gamut
The original corresponding to the chromatic value in original light tone angle value is organized in one group in triangle and multigroup original light tone angle value or part
Beginning colour triangle meets relation：At least one summit of the target color gamut triangle be located at the original color gamut triangle it
Outward.
In one embodiment of the invention, in step (ii), the object function is bright chroma correction coefficient and original
Matrix and the product of the transposed matrix of the matrix that the product of beginning bright chroma is constituted with the difference of target bright chroma again.
In one embodiment of the invention, the original bright chroma and target bright chroma in the object function is by CIE
Multiple representation in components of color space.
In one embodiment of the invention, multiple components of the CIE color spaces for CIE XYZ color spaces three
L, a and b component of values or CIE Lab color spaces.
In one embodiment of the invention, the span of the bright chroma correction coefficient in the object function be more than
Or be equal to 0 and be less than or equal to 1.
Additionally, the embodiment of the present invention also proposes a kind of LED display bright chroma means for correcting, which includes：Original light tone
Transmission module in angle value acquisition module, bright chroma correction coefficient acquisition module and bright chroma correction coefficient.Wherein, original bright chroma
Value acquisition module, for obtaining the multigroup original light tone angle value of the LED display that measurement is obtained；Bright chroma correction coefficient is obtained
Module, is relevant to bright chroma correction coefficient, the object function of original bright chroma and target bright chroma will be described bright for utilizing
The span of chromaticity correction coefficient obtains bright in the target of original light tone angle value described in each group and setting as constraints
Corresponding bright chroma correction coefficient when target function value is minimum when chromatic value substitutes into the object function；And bright chroma correction system
Transmission module on number, for uploading the bright chroma correction coefficient of acquisition and storing hard to the control system of the LED display
Part.
In one embodiment of the invention, the aim colour corresponding to the chromatic value in the target light tone angle value of the setting
One group in domain triangle and multigroup original light tone angle value or part are organized corresponding to the chromatic value in original light tone angle value
Original color gamut triangle meets relation：At least one summit of the target color gamut triangle is located at the original color gamut triangle
Outside.
In one embodiment of the invention, the object function is the product of bright chroma correction coefficient and original bright chroma
The matrix for constituting with the difference of target bright chroma again and the product of the transposed matrix of the matrix, and the light tone in the object function
The span of degree correction coefficient is more than or equal to 0 and less than or equal to 1.
From the foregoing, it will be observed that the embodiment of the present invention is by using corresponding each color during constraints calculating target function minimum
Component correction coefficient so that the closest point that can be reached is searched out in three-dimensional so that achieved color is as far as possible
It is close to target light tone angle value so that display effect is more preferable
By the detailed description below with reference to accompanying drawing, the other side and feature of the present invention become obvious.But should know
Road, the purpose design that the accompanying drawing is only explained, not as the restriction of the scope of the present invention.It should also be noted that unless another
Point out outward, it is not necessary to scale accompanying drawing, they only try hard to conceptually illustrate structure described herein and flow process.
Description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is the relation schematic diagram of a kind of original color gamut triangle of the prior art and target color gamut triangle.
Fig. 2 is a kind of schematic diagram found from the closest achievable chromaticity coordinates of chromaticity coordinates desired value of the prior art.
The step of Fig. 3 is a kind of LED display bright chroma bearing calibration of embodiment of the present invention flow chart.
Functional block diagrams of the Fig. 4 for a kind of LED display bright chroma means for correcting of the embodiment of the present invention.
Specific embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
As an example, for RGB all-colour LEDs display device such as RGB full-color LED display screens in following embodiments of the invention
Integral correction flow process can be divided into：Gathered data, sets target value, generate and upload three steps of correction coefficient.
First, gathered data
The initial data that LED display screen body primary colours (red, green, blue) is gathered using image capture device obtains multigroup original
Beginning light tone angle value, each group of original light tone angle value can be one group of bright chroma measured value for corresponding to single led lamp point herein, also may be used
Being certain preferable viewing area of bright chroma uniformity of correspondence (such as bright chroma uniformity preferably single led lamp plate, single
The even single led display subregion of LED box) multiple LED points one group of bright chroma measured value.Additionally, obtaining original number
According to method have various：Light tone angle value Lxy is measured again and again by light splitting type colorimeter, precision highest, but it is relatively inefficient；
Or light tone angle value Lxy is obtained by the industrial camera of band XYZ filter discs, precision is higher, and efficiency is higher, but with XYZ filter discs
Industrial camera is expensive；Or light tone angle value Lxy is obtained by common color digital camera, namely first pass through colored digital
Camera obtains the RGB numerical value of each LED point, then changes RGB numerical value into XYZ numerical value, and then obtains light tone angle value Lxy.Wherein,
RGB numerical value to the conversion method of XYZ numerical value can be：Modelling, look-up table (LUT, Look up Table), neural network etc..
Wherein, modelling is by setting up some Mathematical Modelings, realizingBetween linearly or nonlinearly change
Change.Such as S-curve models, Masking models, GOG (Gain-Offset-Gamma) models or multinomial model etc..Table look-up
Method is to set up the look-up table of one-dimensional or three-dimensional (3D-LUT), and which adopts the algorithm of interpolation or extrapolation, finds out
Between corresponding relation, the point value fallen on sampling grid summit be vertex value, not the point on summit using around it is nearest
Vertex value by interpolation algorithm obtain.Neural net method is exactly the characteristic using artificial neural network nonlinear transformation, is built
ErectThe mapping relations of (positive network).The spatial distribution of appropriate selection network structure and training sample set,
Higher precision can be obtained.
2nd, sets target value
Due to the light tone angle value of each LED point it is inconsistent, in order that correction after shield body uniformity, so each
LED point must all be corrected to a unified light tone angle value, i.e. target light tone angle value.In general, target light tone angle value and
Light tone angle value (or claiming original light tone angle value) before correction is compared, and bright chroma has a certain proportion of decay, so can just make each
Individual LED point reaches target light tone angle value by complementary color, and the establishing method of specific target light tone angle value refers to Xi'an Nova
Electronic Science and Technology Co., Ltd. was in 02 month 2015 Application No. 201510070021.5 filed in 10 days, entitled " LED shows
It is public bright described in the application for a patent for invention specification of the bearing calibration of display screen bright chroma and bright chroma correction coefficient generating means "
The establishing method of desired value and public colorimetric targets value is spent, but the present invention is not limited thereto.In brief, for set
Target light tone angle value, as long as the original in original light tone angle value is organized in a certain group in acquired multigroup original light tone angle value or part
The corresponding target color gamut triangle of aim colour angle value in original color gamut triangle and target light tone angle value corresponding to beginning chromatic value
Shape meets relation【At least one summit of the target color gamut triangle is located at outside the original color gamut triangle】It is the present invention
Applicable situation.If it is, of course, understood that the target light tone angle value of setting causes target color gamut triangle to be fully located at
The inside of all original color gamut triangles, then can equally use the bright chroma bearing calibration that the embodiment of the present invention is proposed (especially
It is the computational methods of follow-up bright chroma correction coefficient), be not in simply " the LED referred in background technology in such a case
Chromaticity coordinates can not reach desired value by correction " technical problem.
3rd, generate and upload correction coefficient
Hypothesis uses XYZTRepresent the target light tone angle value of RGB, XYZOThe original light tone angle value of RGB is represented, Coef is
Corresponding correction coefficient, then obtain equation：XYZT=Coef*XYZO。
The extension of above-mentioned equation is got up into as follows：
Wherein, R_LEDin、G_LEDinAnd B_LEDinRed, the green and blue led that correction pre-test is obtained is represented respectively
Light tone angle value (original light tone angle value, such as, represented by XYZ tristimulus values), R_LEDout、G_LEDoutAnd B_LEDoutRespectively
Represent light tone angle value (the target light tone angle value, such as by XYZ tristimulus values tables of red, the green and blue led for needing to reach
Show), a11To shield the correction coefficient (or claiming correction coefficient red luma component) of mass-tone red LED when body shows red, a12And a13
The correction coefficient for respectively shielding complementary color green LED and complementary color blue led when body shows red (or claims correction coefficient red color point
Amount), a21To shield the correction coefficient (or claiming correction coefficient Green brightness component) of mass-tone green LED when body shows green, a22And a23
The correction coefficient for respectively shielding complementary color blue led and complementary color red LED when body shows green (or claims correction coefficient green chroma point
Amount), a31To shield the correction coefficient (or claiming correction coefficient blue luminences component) of primary color blue LED when body shows blue, a32And a33
The correction coefficient for respectively shielding complementary color red LED and complementary color green LED when body shows blue (or claims correction coefficient chroma blue point
Amount).
Specifically, the present embodiment can be in CIE XYZ face using the method found in three-dimensional from the closest point of desired value
Carry out in the colour space, it is also possible to such as CIE color spaces such as CIE Lab color spaces are carried out in other color spaces.
In the present embodiment, to find in CIE XYZ color spaces from the closest point of desired value as an example, which is obtained
Mathematical Modeling is as follows, and the optimal solution of object function is solved in the feasible zone represented by constraints：
Object function：
F=(Coef*XYZO-XYZT)*(Coef*XYZO-XYZT)T, namely object function is bright chroma correction coefficient and original
Matrix and the product of the transposed matrix of the matrix that the product of beginning bright chroma is constituted with the difference of target bright chroma again；Wherein, it is original
The representation of light tone angle value and target light tone angle value is relevant to adopted color space, e.g. empty by CIE XYZ colors
Between tristimulus values XYZ represent, tri- representation in components of L, a and b of CIE Lab color spaces etc..
Constraints：Corresponding correction coefficient each component is more than or equal to 0 and is less than or equal to 1, such as it is above-mentioned be 3 ×
3 matrixesCorrection coefficient in each bright chroma component a11、a12、a13、a21、a22、a23、a31、a32And a33
Span be set to more than or equal to 0 and less than or equal to 1；But herein it is noted that correction coefficient is not limited
In 3 × 3 described matrixes, or other suitable matrixes such as 1 × 9 matrix etc..
By taking certain green LED lamp point as an example：
F=(CoefG*XYZO-XYZT)*(CoefG*XYZO-XYZT)T
=(a21*XOR+a22*XOG+a23XOB-XT)2+(a21*YOR+a22*YOG+a23YOB-YT)2
+(a21*ZOR+a22*ZOG+a23ZOB-XT)2
Wherein, XOR、YORAnd ZORRed original light tone angle value R_LED is represented respectivelyinTristimulus values in X-component, Y point
Amount and Z component, XOG、YOGAnd ZOGGreen original light tone angle value G_LED is represented respectivelyinTristimulus values in X-component, Y-component and
Z component, XOB、YOBAnd YOBBlue original light tone angle value B_LED is represented respectivelyinTristimulus values in X-component, Y-component and Z point
Amount, XTRepresent R_LEDout、G_LEDoutAnd B_LEDoutTristimulus values in X-component, YTRepresent R_LEDout、G_LEDoutAnd B_
LEDoutTristimulus values in Y-component, and ZTRepresent R_LEDout、G_LEDoutAnd B_LEDoutTristimulus values in Z point
Amount,
By above-mentioned object function and constraints, corresponding green correction coefficient when calculating target function value minimum
a21、a22And a23；By that analogy, it is also possible to solve red and blue-correction coefficient.As can be seen here, the present embodiment is each face
The calculating of the correction coefficient of colouring component (red, green, blueness) is carried out respectively.
Afterwards, by the correction coefficient for obtaining upload to LED display control system hardware (for example receiving card or title sweep
Retouch card) on stored, you can realize correcting the bright chroma of LED display, can conclude the step of whole bright chroma is corrected
Shown in Fig. 3.In addition, it is noted that aforementioned LED display bright chroma bearing calibration proposed by the present invention is not limited to
It is applied to the bright chroma correction of RGB three-primary color LED display devices, it is also possible to be applied to dual base color or more multi-primary LED shows dress
The bright chroma correction put；And LED display herein can be LED display, LED box even LED lamp panel.
Finally, referring to Fig. 4, the embodiment of the present invention also proposes a kind of LED display bright chroma means for correcting 40, and which is for example
Realized by the software for being implemented in computer system and including：Original light tone angle value acquisition module 41, bright chroma correction coefficient is obtained
Transmission module 45 in module 43 and bright chroma correction coefficient.Wherein, original light tone angle value acquisition module 41 is measured for obtaining
The multigroup original light tone angle value of the LED display for arriving；Bright chroma correction coefficient acquisition module 43 is relevant to light tone for utilizing
The span of the bright chroma correction coefficient is simultaneously made by the object function of degree correction coefficient, original bright chroma and target bright chroma
For constraints, obtain when the target light tone angle value of original light tone angle value described in each group and setting substitutes into the object function
Corresponding bright chroma correction coefficient when target function value is minimum；And in bright chroma correction coefficient transmission module 45 for by obtain
Bright chroma correction coefficient is uploaded and is stored to the control system hardware of the LED display.As for each functional module 41,43
And 45 function detail can be found in description in aforementioned method steps, will not be described here.
In sum, the embodiment of the present invention is by using corresponding each color during constraints calculating target function minimum
Component correction coefficient so that the closest point that can be reached is searched out in three-dimensional so that achieved color is as far as possible
It is close to target light tone angle value so that display effect is more preferable.
The above, is only presently preferred embodiments of the present invention, not makees any pro forma restriction to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, in the range of without departing from technical solution of the present invention, when making a little change or modification using the technology contents of the disclosure above
For the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to the technical spirit pair of the present invention
Any simple modification, equivalent variations and modification that above example is made, still fall within the range of technical solution of the present invention.
Claims (10)
1. a kind of LED display bright chroma bearing calibration, it is characterised in that including step：
I () obtains the multigroup original light tone angle value of LED display；
(ii) using being relevant to bright chroma correction coefficient, the object function of original bright chroma and target bright chroma by the light tone
The span of degree correction coefficient obtains the target light tone in original light tone angle value described in each group and setting as constraints
Corresponding bright chroma correction coefficient when target function value is minimum when angle value substitutes into the object function；And
(iii) the bright chroma correction coefficient of acquisition is uploaded and is stored to the control system hardware of the LED display.
2. LED display bright chroma bearing calibration as claimed in claim 1, it is characterised in that also wrapped before step (i)
Include step：
The light tone degrees of data of the LED display primary colours is gathered using image capture device.
3. LED display bright chroma bearing calibration as claimed in claim 1, it is characterised in that before step (ii) also
Including step：
Set the target light tone angle value and the chromatic value in making the target light tone angle value corresponding to target color gamut triangle
The original color gamut corresponding to the chromatic value in original light tone angle value is organized with a group in multigroup original light tone angle value or part
Triangle meets relation：At least one summit of the target color gamut triangle is located at outside the original color gamut triangle.
4. LED display bright chroma bearing calibration as claimed in claim 1, it is characterised in that in step (ii), described
Object function is the matrix and the square that the product of bright chroma correction coefficient and original bright chroma is constituted with the difference of target bright chroma again
The product of the transposed matrix of battle array.
5. LED display bright chroma bearing calibration as claimed in claim 4, it is characterised in that in the object function
The multiple representation in components of original bright chroma and target bright chroma by CIE color spaces.
6. LED display bright chroma bearing calibration as claimed in claim 5, it is characterised in that the CIE color spaces
L, a and b component of multiple components for the tristimulus values or CIE Lab color spaces of CIE XYZ color spaces.
7. the LED display bright chroma bearing calibration as described in claim 4 to 7 any one, it is characterised in that the mesh
The span of the bright chroma correction coefficient in scalar functions is more than or equal to 0 and less than or equal to 1.
8. a kind of LED display bright chroma means for correcting, it is characterised in that include：
Original light tone angle value acquisition module, for obtaining the multigroup original light tone angle value of the LED display that measurement is obtained；
Bright chroma correction coefficient acquisition module, is relevant to bright chroma correction coefficient, original bright chroma and target light tone for utilizing
The object function of degree and using the span of the bright chroma correction coefficient as constraints, obtain original described in each group
Corresponding bright chroma school when target function value is minimum when the target light tone angle value of light tone angle value and setting substitutes into the object function
Positive coefficient；And
Transmission module in bright chroma correction coefficient, shows for uploading and storing to the LED bright chroma correction coefficient of acquisition
The control system hardware of device.
9. LED display bright chroma means for correcting as claimed in claim 8, it is characterised in that the target of the setting is bright
One group or part group in target color gamut triangle and multigroup original light tone angle value corresponding to chromatic value in chromatic value
The original color gamut triangle corresponding to chromatic value in original light tone angle value meets relation：The target color gamut triangle is at least
One summit is located at outside the original color gamut triangle.
10. LED display bright chroma means for correcting as claimed in claim 8, it is characterised in that the object function is bright
Matrix and the transposed matrix of the matrix that the product of chromaticity correction coefficient and original bright chroma is constituted with the difference of target bright chroma again
Product, and the span of the bright chroma correction coefficient in the object function is more than or equal to 0 and is less than or equal to
1。
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| CN113178165B (en) * | 2021-03-26 | 2022-03-18 | 卡莱特云科技股份有限公司 | LED display screen correction method and device in HDR mode |
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