CN116665591A - Brightness curve calibration method, device, computer equipment and storage medium - Google Patents

Brightness curve calibration method, device, computer equipment and storage medium Download PDF

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Publication number
CN116665591A
CN116665591A CN202210153616.7A CN202210153616A CN116665591A CN 116665591 A CN116665591 A CN 116665591A CN 202210153616 A CN202210153616 A CN 202210153616A CN 116665591 A CN116665591 A CN 116665591A
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Prior art keywords
brightness
gray scale
value
calibration
calibration point
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黄龙
杨锟
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Glenfly Tech Co Ltd
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Glenfly Tech Co Ltd
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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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

The application relates to a brightness curve calibration method, a device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring a brightness gray scale original calibration point set corresponding to a pixel; determining a plurality of brightness gray scale calibration points selected from a brightness gray scale original calibration point set; selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points; if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points. The method can improve the accuracy of the calibrated brightness curve.

Description

Brightness curve calibration method, device, computer equipment and storage medium
Technical Field
The present application relates to the field of image display technology, and in particular, to a brightness curve calibration method, device, computer equipment, storage medium and computer program product.
Background
With the development of image display technology, there is a technology of displaying images using AMOLED display devices, in which the display screen is formed of sub-pixel devices capable of emitting light independently, for example, sub-pixel thin film transistors, and various trace phenomena, that is, mura phenomena, may occur due to non-uniformity of brightness when displaying images through the display devices due to uncontrollable factors existing in the manufacturing process of the sub-pixel devices.
At present, correction is usually required to be performed on each pixel in a display device aiming at the mura phenomenon in the display device, the method firstly corrects the pixel correction to the standard brightness curve by determining the standard brightness curve of the display device for reflecting the corresponding relation between gray scale and brightness, and meanwhile, the calibration of the brightness curve is usually realized by adopting a linear folding line mode of gray scale and brightness because the linear corresponding relation between gray scale and brightness does not exist in the brightness curve, and the pixel correction is realized by correcting the standard curve through the brightness calibration curve of each pixel. However, the error between the calibration curve used to calibrate the pixel brightness curve and the pixel brightness curve is large, so the effect of pixel correction is poor.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a luminance curve calibration method, apparatus, computer device, computer-readable storage medium, and computer program product that can improve the accuracy of a calibration curve.
In a first aspect, the present application provides a brightness curve calibration method, the method comprising:
acquiring a brightness gray scale original calibration point set corresponding to a pixel;
Determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
In one embodiment, the selecting the auxiliary calibration point constrained by the luminance values and the gray scale values of the two adjacent luminance gray scale calibration points includes: acquiring a first brightness gray scale standard point with the minimum gray scale value and a second brightness gray scale standard point with the maximum gray scale value from the plurality of brightness gray scale standard points; acquiring a first auxiliary calibration point constrained by a first brightness gray scale calibration point, a brightness value and a gray scale value of a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point, and a second auxiliary calibration point constrained by a brightness value and a gray scale value of a brightness gray scale calibration point adjacent to the second brightness gray scale calibration point; and taking the first auxiliary calibration point and the second auxiliary calibration point as the selected auxiliary calibration points.
In one embodiment, the obtaining a first auxiliary calibration point constrained by the luminance value and the gray value of a first luminance gray scale calibration point and a luminance gray scale calibration point adjacent to the first luminance gray scale calibration point includes: acquiring a first gray scale value and a first brightness value corresponding to the first brightness gray scale calibration point, and a second gray scale value and a second brightness value corresponding to a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point; determining a gray scale interval based on the first gray scale value, the second gray scale value and a pre-configured gray scale coefficient, and acquiring a constraint gray scale value from the gray scale interval; determining a brightness value interval according to the constraint gray scale value, the first brightness value and the second brightness value, and selecting a constraint brightness value from the brightness value interval; and obtaining the first auxiliary calibration point according to the constraint gray scale value and the constraint brightness value.
In one embodiment, determining the luminance value interval according to the gray-scale value, the first luminance value, and the second luminance value of the first auxiliary calibration point includes: obtaining a brightness connecting line between the first brightness gray scale calibration points and the brightness gray scale calibration points adjacent to the first brightness gray scale calibration points according to the first brightness value and the second brightness value and the first gray scale value and the second gray scale value; determining an initial brightness value corresponding to the constraint gray scale value according to the brightness connecting line; and obtaining a pre-configured brightness gain coefficient, and determining the brightness value interval by using the initial brightness value and the brightness gain coefficient.
In one embodiment, the number of the auxiliary calibration points constrained by the brightness values and the gray scale values of the two adjacent brightness gray scale calibration points is a plurality of; if the auxiliary calibration point makes the broken line connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration point meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points, including: selecting verification calibration points between the two adjacent brightness gray scale calibration points from the brightness gray scale original calibration point set; obtaining folding lines connecting each auxiliary calibration point with the two adjacent brightness gray scale calibration points to obtain a plurality of candidate folding lines; acquiring brightness values of gray scale values corresponding to the verification calibration points on each candidate folding line, and determining brightness value errors of each candidate folding line according to the brightness values on each candidate folding line and the brightness values represented by the verification calibration points; and taking the candidate broken line with the minimum brightness value error as the broken line meeting the preset brightness error condition.
In one embodiment, the obtaining the original calibration point set of the brightness gray scale corresponding to the pixel includes: acquiring a plurality of gray scale values preset for the pixels; gamma correction processing is carried out on each preset gray scale value, and brightness values corresponding to the preset gray scale values are obtained; and carrying out normalization processing on the brightness values, and constructing the brightness gray scale original calibration point set based on the normalized brightness values and the gray scale values.
In one embodiment, the pixel is a display pixel included in the display device to be corrected; after the brightness curve of the pixel is calibrated, the method further comprises the following steps: acquiring brightness curves respectively calibrated by display pixels contained in the display equipment to be corrected; determining a reference brightness curve from the respectively calibrated brightness curves; and correcting the brightness curves calibrated by the display pixels respectively based on the reference brightness curves.
In a second aspect, the present application further provides a brightness curve calibration device, which includes:
the original brightness calibration module is used for acquiring a brightness gray scale original calibration point set corresponding to the pixel;
the brightness gray scale calibration module is used for determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
the auxiliary calibration selection module is used for selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and the brightness curve calibration module is used for calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring a brightness gray scale original calibration point set corresponding to a pixel;
determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring a brightness gray scale original calibration point set corresponding to a pixel;
determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
Selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
acquiring a brightness gray scale original calibration point set corresponding to a pixel;
determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
The brightness curve calibration method, the device, the computer equipment, the storage medium and the computer program product are characterized in that a brightness gray scale original calibration point set corresponding to pixels is obtained; determining a plurality of brightness gray scale calibration points selected from a brightness gray scale original calibration point set; selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points; if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points. In this embodiment, the manner of calibrating the luminance curve is obtained by connecting the luminance gray scale calibration points selected in the set of the original luminance gray scale calibration points, and the luminance values and the gray scale values of the adjacent luminance gray scale calibration points, and the auxiliary calibration points satisfying the preset luminance error condition.
Drawings
FIG. 1 is a flow chart of a method for calibrating a luminance curve according to an embodiment;
FIG. 2 is a flow diagram of selecting auxiliary calibration points in one embodiment;
FIG. 3 is a flow diagram of a process for obtaining a first auxiliary calibration point in one embodiment;
FIG. 4 is a flowchart illustrating a process of determining a luminance value interval according to an embodiment;
FIG. 5 is a flow chart illustrating a brightness curve of a pixel in one embodiment;
FIG. 6 is a flow chart of a correction process for display pixels in one embodiment;
FIG. 7 is a schematic diagram of dynamic binding point setup in an application instance;
FIG. 8 is a block diagram of a luminance profile calibration device according to an embodiment;
fig. 9 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, a brightness curve calibration method is provided, and this embodiment is illustrated by applying the method to a terminal, where the terminal may be various personal computers, notebook computers, smartphones, tablet computers and portable wearable devices, and it is understood that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and implemented through interaction between the terminal and the server. In this embodiment, the method includes the steps of:
Step S101, acquiring a brightness gray scale original calibration point set corresponding to a pixel.
The pixel may refer to a pixel that needs to be corrected and is located in the AMOLED display device, and the set of brightness gray-scale original calibration points is a set for storing a correspondence between brightness values and gray-scale values of the pixel, where coordinates of different brightness original calibration points may represent different brightness values corresponding to the pixel when the pixel is in different gray-scale values. For example, the set of original calibration points for luminance gray scale may include calibration point a, calibration point B, and calibration point C, where coordinates (a, a) of calibration point a may indicate that the luminance value corresponding to the pixel at the gray scale value a is the luminance value a, and coordinates (B, B) of calibration point B may indicate that the luminance value corresponding to the pixel at the gray scale value B is the luminance value B, and so on. In this embodiment, the terminal may collect different pixel values corresponding to a certain pixel under different gray scale values, so as to obtain a plurality of brightness gray scale original calibration points, and form a brightness gray scale original calibration point set.
Step S102, a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set are determined.
In this embodiment, not all the calibration points in the original calibration point set of the brightness gray scale are used to form the brightness calibration curve of the pixel, but a part of the calibration points are selected to be used as the brightness gray scale calibration points, and the calibration curve is formed by using the screened brightness gray scale calibration points. For example, the luminance gray scale original set of calibration points may include calibration point a, calibration point B, and calibration point C, and if the calibration point corresponding to the gray scale value a and the gray scale value C is preset in the terminal as the luminance gray scale calibration point, the calibration point a and the calibration point C may be selected from the collected calibration points a, B, and C as the luminance gray scale calibration points.
Step S103, selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points.
The auxiliary calibration points are calibration points constrained by the brightness values and the gray scale values of the two adjacent brightness gray scale calibration points, namely, the gray scale values of the calibration points are positioned between the gray scale values of the two adjacent brightness gray scale calibration points, the brightness values are positioned between the brightness values of the two adjacent brightness gray scale calibration points, the number of the auxiliary calibration points can be a plurality of auxiliary calibration points, and the auxiliary calibration points can be used as auxiliary calibration points as long as the constraint relation is met. In this embodiment, after determining two adjacent luminance gray scale calibration points in step S102, a plurality of auxiliary calibration points satisfying constraint conditions may be selected from the luminance gray scale intervals formed by the luminance values and the gray scale values between the two adjacent luminance gray scale calibration points.
For example, the calibration point a and the calibration point C serve as two adjacent gray-scale calibration points, and the coordinates of the calibration point a are [ a, a ], the gray-scale value representing the calibration point a is the gray-scale value corresponding to the gray-scale value a is the brightness value a, and the coordinates of the calibration point C are [ C, C ], the gray-scale value representing the calibration point C is the gray-scale value corresponding to the gray-scale value C, so that the selection range of the auxiliary calibration point is that the gray-scale value is between the gray-scale values a-C, and the brightness value is between the brightness values a-C.
Step S104, if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
The preset brightness error condition refers to a preset brightness error condition, which can be used for representing an error between a brightness calibration curve displayed in a broken line form and a standard brightness curve, in this embodiment, after a plurality of auxiliary calibration points included between two adjacent brightness gray scale calibration points are determined, each auxiliary calibration point can be connected with two adjacent brightness gray scale calibration points, so as to obtain a plurality of broken lines, and the terminal can screen out broken lines meeting the preset brightness error condition from the plurality of broken lines, screen out the auxiliary calibration points corresponding to the broken lines from the plurality of auxiliary calibration points, and obtain a final brightness calibration curve by connecting the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
For example, the set of luminance gray-scale original set of calibration points contains a calibration point a, a calibration point B, a calibration point C, a calibration point D, and a calibration point E, wherein the gray-scale value magnitude relationship is that the gray-scale value a of the calibration point a < the gray-scale value B of the calibration point B < the gray-scale value C of the calibration point C < the gray-scale value D of the calibration point D < the gray-scale value E of the calibration point E, if the terminal takes the calibration point a, the calibration point C, and the calibration point E as a plurality of luminance gray-scale calibration points, and since the calibration point a and the calibration point C, and the calibration point C and the calibration point E belong to two neighboring luminance gray-scale calibration points, a plurality of auxiliary calibration points constrained by the calibration point a and the calibration point C can be determined, such as set point B1, set point B2, set point B3, etc., while set point C and set point E are constrained, set point D1, set point D2, set point D3, etc., so that a plurality of fold lines such as set point a-set point B1-set point C-set point D1-set point E, set point a-set point B1-set point C-set point D2-set point E, etc., can be formed, and then a fold line satisfying a preset brightness error condition, such as a fold line having the smallest brightness error, can be selected from the plurality of fold lines as a final brightness calibration curve for the pixel. Because the calibration point B and the calibration point D meet constraint conditions, namely, the calibration curve formed by the calibration point B and the calibration point D also belongs to a part of a plurality of brightness calibration curves, and meanwhile, the embodiment can select the optimal curve meeting preset brightness error conditions from the plurality of brightness calibration curves as the brightness curve of the calibration pixel, so that compared with the method that the fixed fold line formed by the calibration point A-calibration point B-calibration point C-calibration point D-calibration point E is directly used as the brightness calibration curve, the embodiment can improve the accuracy of the calibrated pixel brightness curve.
In the brightness curve calibration method, a brightness gray scale original calibration point set corresponding to a pixel is obtained; determining a plurality of brightness gray scale calibration points selected from a brightness gray scale original calibration point set; selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points; if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points. In this embodiment, the manner of calibrating the luminance curve is obtained by connecting the luminance gray scale calibration points selected in the set of the original luminance gray scale calibration points, and the luminance values and the gray scale values of the adjacent luminance gray scale calibration points, and the auxiliary calibration points satisfying the preset luminance error condition.
In one embodiment, as shown in fig. 2, step S103 may further include:
step S201, obtaining a first luminance gray scale point with a minimum gray scale value and a second luminance gray scale point with a maximum gray scale value from the plurality of luminance gray scale points.
The first luminance gray scale point refers to the luminance gray scale point with the smallest gray scale value, and the second luminance gray scale point refers to the luminance gray scale point with the largest gray scale value. After determining the selected multiple gray scale points in step S102, the gray scale value of each gray scale point may be obtained, and the gray scale point with the smallest gray scale value is used as the first gray scale point, and the gray scale point with the largest gray scale value is used as the second gray scale point.
Step S202, a first auxiliary calibration point constrained by the brightness value and the gray value of a first brightness gray scale calibration point and a second auxiliary calibration point constrained by the brightness value and the gray value of a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point and a second brightness gray scale calibration point adjacent to the second brightness gray scale calibration point are obtained;
in step S203, the first auxiliary calibration point and the second auxiliary calibration point are taken as selected auxiliary calibration points.
In this embodiment, the acquisition of the auxiliary calibration point is performed only for the first luminance gray-scale calibration point having the smallest gray-scale value and the luminance gray-scale calibration point adjacent thereto, and is performed only for the second luminance gray-scale calibration point having the largest gray-scale value and the luminance gray-scale calibration point adjacent thereto. Since the brightness variation in the low gray scale region and the high gray scale region has large difference, and the uniformity of the gray scale region variation in the middle region is high, the auxiliary calibration point is acquired only for the high gray scale region and the low gray scale region in the embodiment.
For example, the determined gray-scale calibration points are respectively a calibration point a, a calibration point C, a calibration point D, a calibration point E and a calibration point G in order of gray-scale values from small to large, and then the first gray-scale calibration point may be the calibration point a, the second gray-scale calibration point may be the calibration point G, and in this embodiment, the auxiliary calibration point is obtained only between the first gray-scale calibration point and its neighboring gray-scale calibration point, and between the second gray-scale calibration point and its neighboring gray-scale calibration point, that is, only the region between the calibration point a and the calibration point C, and the region between the calibration point E and the calibration point G.
In this embodiment, the auxiliary calibration point is only obtained for the low gray level region and the high gray level region with larger difference of brightness change, while the auxiliary calibration point is not obtained for the middle region with stronger consistency, so that the obtaining efficiency of the calibration curve is improved under the condition of ensuring the accuracy of the calibration brightness curve.
In one embodiment, as shown in fig. 3, step S202 may further include:
step S301, a first gray-scale value and a first luminance value corresponding to a first gray-scale calibration point of the first luminance, and a second gray-scale value and a second luminance value corresponding to a luminance gray-scale calibration point adjacent to the first gray-scale calibration point of the first luminance are obtained.
The first gray scale value refers to a gray scale value corresponding to a first brightness gray scale point, the first brightness value refers to a brightness value corresponding to the first brightness gray scale point, the second gray scale value refers to a gray scale value corresponding to a brightness gray scale point adjacent to the first brightness gray scale point, and the second brightness value refers to a brightness value corresponding to the brightness gray scale point.
For example, when the first luminance gray scale point is the point a and the point adjacent thereto is the point C, then the first gray scale value and the first luminance value represent the gray scale value and the luminance value of the point a, and the second gray scale value and the second luminance value represent the gray scale value and the luminance value of the point C.
In step S302, a gray scale interval is determined based on the first gray scale value, the second gray scale value and the pre-configured gray scale coefficient, and a constraint gray scale value is obtained from the gray scale interval.
The constraint gray scale values represent the gray scale values corresponding to the screened first auxiliary calibration points, and the number of the gray scale values can be multiple and only needs to meet the gray scale interval. The gray-scale coefficient is a coefficient for restricting the range of the gray-scale interval, and the coefficient may be configured in advance, for example, may be set to 0.7. In this embodiment, the determination of the gray scale interval for obtaining the constraint gray scale value needs to be determined according to the set gray scale coefficient in addition to the first gray scale value and the second gray scale value.
Specifically, the gray-scale interval corresponding to the set constraint gray-scale value may be expressed as: (gray_p1, gray_p1+ (gray_p3-gray_p1) ×n)), wherein gray_p1 represents a first gray scale value, gray_p3 represents a second gray scale value, and n represents a preset gray scale coefficient.
Step S303, determining a brightness value interval according to the constraint gray scale value, the first brightness value and the second brightness value, and selecting a constraint brightness value from the brightness value interval.
The constraint luminance value represents the luminance value corresponding to the first auxiliary calibration point which is screened out, and the number of the luminance values can be also a plurality of the luminance values, and only the luminance value interval needs to be satisfied. In this embodiment, after determining the constraint gray-scale value in step S302, the obtained constraint gray-scale value, the first luminance value and the second luminance value may be used to determine a luminance value interval that is satisfied by the luminance value corresponding to the constraint gray-scale value, and constraint luminance values corresponding to the constraint gray-scale value may be screened out.
Step S304, a first auxiliary calibration point is obtained according to the constraint gray scale value and the constraint brightness value.
Finally, after determining the constraint gray-scale values in step S302 and determining the constraint brightness values corresponding to the constraint gray-scale values in step S303, a plurality of corresponding first auxiliary calibration points may be obtained by using the constraint gray-scale values and the constraint gray-scale values.
Similarly, the determining manner of the second auxiliary calibration point may be implemented by the above steps, where the second luminance gray-scale calibration point and the gray-scale value and the luminance value corresponding to the luminance gray-scale calibration point adjacent to the second luminance gray-scale calibration point are determined first, then the corresponding gray-scale interval may be obtained by using the gray-scale coefficient and the gray-scale value of the second luminance gray-scale calibration point and the gray-scale value of the luminance gray-scale calibration point adjacent to the second luminance gray-scale calibration point, and after the corresponding constraint gray-scale value is screened from the gray-scale interval, the luminance value interval may be obtained based on the constraint gray-scale value, the second luminance gray-scale calibration point and the luminance value of the luminance gray-scale calibration point adjacent to the second luminance gray-scale calibration point, so that after the corresponding constraint luminance value is determined, the second auxiliary calibration point is formed.
In this embodiment, the determination of the first auxiliary calibration point is obtained by constraint gray-scale values and constraint brightness values, where the constraint gray-scale values are selected from gray-scale intervals determined according to the first brightness gray-scale calibration point and the adjacent brightness gray-scale calibration point, and the constraint brightness values are determined according to the determined overconstraint gray-scale values and the brightness values of the first brightness gray-scale calibration point and the adjacent brightness gray-scale calibration point, so that the gray-scale values and the brightness values of the first auxiliary calibration point can be further constrained, and errors of the calibrated brightness curves can be further reduced.
Further, as shown in fig. 4, step S303 may further include:
step S401, obtaining a first brightness gray scale point according to the first brightness value and the second brightness value, and the first gray scale value and the second gray scale value, and a brightness connecting line between the brightness gray scale points adjacent to the first brightness gray scale point.
The luminance connecting line refers to a first luminance gray scale point and a connecting line between luminance gray scale points adjacent to the first luminance gray scale point, and in this embodiment, after determining a first luminance value and a second luminance value, and the first gray scale value and the second gray scale value, a function expression form for the first luminance gray scale point and the connecting line between the adjacent luminance gray scale points can be obtained, so as to obtain the luminance connecting line.
Step S402, determining an initial brightness value corresponding to the constraint gray scale value according to the brightness connection.
The initial luminance value refers to a luminance value of a position of the constraint gray-scale value corresponding to the luminance line, and since the function expression form of the luminance line can represent the relationship between the luminance value and the gray-scale value, after determining that the constraint luminance value is obtained in step S302, the constraint luminance value can be substituted into the function expression form of the luminance line, so as to obtain the initial luminance value corresponding to the constraint gray-scale value.
Step S403, obtaining a pre-configured brightness gain coefficient, and determining a brightness value interval by using the initial brightness value and the brightness gain coefficient.
The luminance gain coefficient refers to a gain coefficient for luminance that is preconfigured, for example, may be 0.002, for solving the influence caused by, for example, luminance noise, so that after the initial luminance value is obtained in step S402, the initial luminance value and the luminance gain coefficient may be further added, so as to determine a luminance value interval.
For example, the luminance value interval may be expressed as follows: (lumi 1, (lumi_a1-grad_p1)/(grad_p3-grad_p1)/(lumi 3-lumi 1) +lumi1+m), wherein lumi1 represents a first luminance value, grad_a1 represents a constraint gray value, (grad_a1-grad_p1)/(grad_p3-grad_p1)/(lumi 3-lumi 1) represents an initial luminance value of the constraint gray value on a luminance line, and m represents a luminance gain coefficient.
Similarly, the determination of the brightness value interval for the second auxiliary calibration point may also be achieved by the steps described above: and establishing a brightness connecting line between the second brightness gray scale calibration point and the first brightness gray scale calibration point adjacent to the second brightness gray scale calibration point, determining an initial brightness value corresponding to the constraint gray scale value by utilizing the brightness connecting line, and obtaining a final brightness value interval corresponding to the constraint gray scale value based on the initial brightness value and the brightness gain coefficient.
In this embodiment, the luminance value interval may be selected according to an initial luminance value corresponding to the constraint gray-scale value on the luminance connecting line and a pre-configured luminance gain coefficient, so that the influence caused by the luminance noise can be eliminated by the luminance gain coefficient, and the accuracy of determining the luminance value interval is further improved.
In one embodiment, the number of auxiliary calibration points constrained by the luminance values and gray values of two adjacent luminance gray scale calibration points is a plurality; as shown in fig. 5, step S104 may further include:
in step S501, a verification calibration point located between two adjacent brightness gray scale calibration points is selected from the brightness gray scale original calibration point set.
The verification calibration points refer to calibration points in the set of brightness gray-scale original calibration points, which are located between two adjacent brightness gray-scale calibration points, in this embodiment, since not all collected calibration points in the set of brightness gray-scale original calibration points are used as brightness gray-scale calibration points, if the rest calibration points are located between two screened adjacent brightness gray-scale calibration points, they can be used as verification calibration points.
For example, the set of gray-scale original calibration points may include calibration point 1, calibration point 2, calibration point 3, calibration point 4, calibration point 5, calibration point 6, and calibration point 7 in order of gray-scale values from small to large, and if the selected gray-scale calibration points are calibration point 1, calibration point 4, calibration point 5, and calibration point 7, the remaining calibration points 2 and 3 may be regarded as verification calibration points since they are located between adjacent gray-scale calibration points, that is, between calibration point 1 and calibration point 4, and similarly, since calibration point 6 is located between calibration point 5 and calibration point 7.
Step S502, obtaining folding lines connecting each auxiliary calibration point and two adjacent brightness gray scale calibration points to obtain a plurality of candidate folding lines.
The candidate broken lines refer to broken lines formed between the auxiliary calibration points and the adjacent two brightness gray scale calibration points, and the number of the auxiliary calibration points constrained by the adjacent two brightness gray scale calibration points can be multiple, so the number of the candidate broken lines can also be multiple. Taking the calibration point 1 and the calibration point 4 as two adjacent brightness gray scale calibration points as an example, the number of auxiliary calibration points constrained by the calibration point 1 and the calibration point 4 can also be a plurality, for example, the auxiliary calibration point 1, the auxiliary calibration point 2 and the auxiliary calibration point 3 can be included, and then the folding lines connecting each auxiliary calibration point and the two adjacent brightness gray scale calibration points, namely, the number of candidate folding lines can also be a plurality, namely, the folding lines 1 formed by the calibration point 1-the auxiliary calibration point 1-the calibration point 4, the folding lines 2 formed by the calibration point 1-the auxiliary calibration point 2-the calibration point 4 and the folding lines 3 formed by the calibration point 1-the auxiliary calibration point 3-the calibration point 4 can be respectively.
Step S503, obtaining the brightness value of the gray scale value corresponding to the verification calibration point on each candidate folding line, and determining the brightness value error of each candidate folding line according to the brightness value on each candidate folding line and the brightness value represented by the verification calibration point.
The brightness value represented by the verification calibration point refers to the actually measured brightness value corresponding to the verification calibration point, namely the real brightness value of the verification calibration point, and the brightness value of the gray scale value corresponding to the verification calibration point on each candidate folding line refers to the brightness value reflected by the gray scale value corresponding to the verification calibration point on each candidate folding line, namely the brightness value calibrated by the verification calibration point on each candidate folding line. In this embodiment, after obtaining the plurality of candidate folding lines in step S502, since the candidate folding lines may be used to represent the correspondence between the luminance value and the gray scale value, the terminal may obtain, on each candidate folding line, the luminance value corresponding to the gray scale value of a certain verification calibration point, as the calibration luminance value corresponding to the gray scale value of each candidate folding line, and may also calculate the error between the luminance values by using the calibration luminance value and the actual luminance value, where each verification calibration point is an error on a certain candidate folding line. After obtaining the error of each verification calibration point on a certain candidate folding line, the errors can be summed to be used as the brightness value error of each candidate folding line.
For example, if there are a calibration point 2 and a calibration point 3 between the calibration point 1 and the calibration point 4, and a plurality of candidate folding lines connecting the calibration point 1 and the calibration point 4 are determined in step S502, the brightness value errors corresponding to the candidate folding lines may be calculated, respectively. Taking the broken line 1 as an example, after the correspondence between the luminance value and the gray level value described by the broken line 1 is determined, the gray level value corresponding to the standard point 2 and the standard point 3 can be substituted into the correspondence to obtain the luminance value corresponding to each gray level value, the luminance value 2 'and the luminance value 3' are represented, and the luminance value represented by the standard point 2 and the standard point 3 is represented at the same time, that is, the real luminance value corresponding to the gray level value is the luminance value 2 and the luminance value 3, so that the error can be calculated by using the luminance value 2 'and the luminance value 2, and the error can be calculated by using the luminance value 3' and the luminance value 3, and the sum of the errors is taken as the luminance value error of the broken line 1, so that the luminance value error corresponding to all the candidate broken lines can be obtained.
For example, the calculation formula of the luminance value error may be as follows:
wherein, p1 and p3 respectively represent two adjacent gray scale calibration points of brightness, lumi represents the brightness value represented by each verification calibration point, namely, the real brightness value corresponding to a gray scale value between p1 and p3, and La represents the brightness value corresponding to the gray scale value represented on a candidate folding line connecting p1 and p 3.
In step S504, the candidate broken line with the smallest brightness value error is used as the broken line satisfying the preset brightness error condition.
Finally, after the luminance value errors of all the candidate folding lines are obtained in step S503, the candidate folding line with the smallest luminance value error can be determined from the obtained luminance value errors, and the candidate folding line is used as the final folding line meeting the preset luminance error condition.
In this embodiment, the verification calibration points in the set of the original brightness calibration points may be used to verify a plurality of candidate folding lines formed by each auxiliary calibration point and two adjacent brightness gray calibration points, so as to screen out the candidate folding line with the smallest brightness value error as the folding line meeting the preset brightness error condition, thereby ensuring that the screened folding line has the smallest error value with the real brightness curve, and further improving the accuracy of the brightness calibration curve.
In one embodiment, step S101 may further include: acquiring a plurality of gray scale values preset for pixels; gamma correction processing is carried out on each preset gray level value, so that brightness values corresponding to each preset gray level value are obtained; and carrying out normalization processing on the brightness values, and constructing a brightness gray scale original calibration point set based on the normalized brightness values and each gray scale value.
In this embodiment, the construction of the original calibration point set of the luminance gray scale may be achieved by constructing the corresponding relationship between different gray scale values and luminance values of the pixel, firstly, obtaining a plurality of luminance values obtained after gamma correction processing is performed on a plurality of gray scale values in the pixel, and performing luminance normalization processing on the luminance values to obtain luminance values after normalization processing, and finally, the corresponding relationship between each gray scale value and the luminance value after normalization processing may be established, so as to obtain a plurality of original calibration points of the luminance gray scale, and form the original calibration point set of the luminance gray scale.
For example, for a certain pixel, the luminance values of the pixel after normalization processing corresponding to different gray-scale values, such as a gray-scale value a, a gray-scale value B, and a gray-scale value C, may be the luminance value a, the luminance value B, and the luminance value C, so as to obtain a calibration point a representing the luminance value a corresponding to the gray-scale value a, a calibration point B representing the luminance value B corresponding to the gray-scale value B, and a calibration point C representing the luminance value C corresponding to the gray-scale value C.
In this embodiment, after gamma correction is performed on the gray scale values, and the brightness values obtained by normalization processing are set up to correspond to the gray scale values, so that a plurality of brightness gray scale original calibration points are obtained, a brightness gray scale original calibration point set is formed, and accuracy of the brightness gray scale original calibration point set can be improved.
In one embodiment, the pixels are display pixels comprised by the display device to be corrected; as shown in fig. 6, after step S104, the method may further include:
step S601, a brightness curve respectively calibrated by each display pixel included in the display device to be corrected is obtained.
The display device to be corrected refers to a display device requiring brightness curve correction, for example, a display device in which mura phenomenon occurs, and the pixels refer to display pixels included in the display device to be corrected. After determining the luminance curve corresponding to a certain display pixel included in the display device to be corrected in step S104, the luminance curve calibrated for each display pixel can be obtained through the processes from step S101 to step S104.
Step S602, determining a reference brightness curve from the respectively calibrated brightness curves.
The reference luminance curve refers to a calibration luminance curve as a calibration target, and in this embodiment, in order to avoid the mura phenomenon, it is necessary to make all the calibration luminance curves in the display device have the same form, so that it is necessary to determine the calibration luminance curve as a standard from the calibration luminance curve, for example, the luminance curve calibrated by the pixels in the central portion of the display device may be used as the reference luminance curve.
In step S603, correction processing is performed on the luminance curves calibrated for the respective display pixels based on the reference luminance curves.
Finally, after the reference brightness curve is determined, the brightness curve calibrated by each display pixel can be corrected to the reference brightness curve, so that each display pixel in the display device can represent the corresponding relation between the gray scale value and the brightness value through the reference brightness curve, and the mura phenomenon generated by the non-uniformity of the brightness value is avoided.
In this embodiment, after determining the brightness curves calibrated by each pixel in the display device to be calibrated, the brightness curves calibrated by each pixel may be calibrated based on the reference brightness curves, so as to improve the effect of pixel calibration.
In an application example, an AMOLED screen demura method based on dynamic binding points is further provided, the method collects brightness images under 0-255 gray scales in a dark environment, and obtains correct display brightness according to brightness change relations under different gray scales, so that specific brightness is calibrated, and different pixel values can be corrected according to dynamic binding point calibration errors.
The method specifically comprises the following steps:
Step 1: and acquiring gamma corrected data.
Step 2: and (5) brightness gray scale normalization.
The gamma value is derived from the fact that human eyes can recognize that the brightness does not have a linear relation with the actual brightness, and for a specified gray scale of 0-255, the collected brightness data is normalized, and in general, the gamma value is approximately 2.2. If the gamma value is larger, the whole image is darker, and details are easy to lose in a low-gray-scale scene; if the gamma value is smaller, the whole image is brighter, and the layering of the image is deviated.
Step 3: dynamic range binding point setting
As shown in fig. 7, in Demura calibration, the fixed binding points are set to be the Gray levels Gray1, gray3, gray4, gray5, gray7 and the luminances lumi1, lumi3, lumi4, lumi5, lumi7 of p1, p3, p4, p5, p 7.
a1 and b1 are virtual dynamic binding points, and n is set as dynamic gray scale factor
The maximum change range of the a1 gray scale is as follows:
(gray_p1,gray_p1+(gray_p3-gray_p1)*n),
the maximum change range of the gray level b1 is as follows:
(gray_p5,gray_p5+(gray_p7-gray_p5)*n),
setting m as brightness gain coefficient
The maximum variation range of the brightness of a1 is:
(lumi1,(gray_a1-p1)/(p3-p1))*(lumi3-lumi1)+lumi1+m)
b1 has a maximum brightness variation range of:
(lumi5,(gray_b1-p5)/(p7-p5))*(lumi7-lumi5)+lumi5+m)
as shown in fig. 7, in the low gray scale regions a 'and a1, a group of virtual dynamic binding points are formed, in the high gray scale regions b' and b1, the oled devices emit light independently, the gray-lumi change consistency in the middle range of p3-p5 is strong, the binding points can be selected relatively commonly, the difference of the light emitting characteristics of the devices in the range of p1-p3 and the range of p5-p7 is large, and therefore, the dynamic binding points a1 and b1 are set for the sub-pixel specificity, so as to correct the relation curve of the low gray scale and the high gray scale.
The dynamic gray scale can be determined as follows:
specifically, in the range of the p1-p3 gray scale, the dynamic gray scale a1 needs to be solved so that each brightness value La on the calibration straight line i (i∈[p1,p3]) The sum of the differences from the standard curve is minimal, i.e. for [ p1, p3]All points in the interval find the dynamic calibration point a1. Within the interval [ p1, p3]]When the point a1 moves dynamically, let p1-a1 be a straight line l, a1-p3 be a straight line 2, and the straight lines 1 and 2 can be used for representing [ p1, p3]]A calibration straight line of the interval, and make the interval [ p1, p3]]The sum of the calibrated brightness La and the actual correction brightness error of all gray scale points is the smallest, namely:
in addition, the actual intervals [ p1, p3] consider dynamic gray scale factors, which may be 0.7, and also consider effects such as luminance noise, and luminance gain factors m, which may be 0.002, with compression, i.e., (gray_p1, gray_p1+ (gray_p3-gray_p1) ×n).
2. Solving the b1 point is consistent with the a1 method.
3. The dynamic binding points are defined as the values of a1 and b1 are different for each calibration curve of the image global, and the rest p1, p3, p4, p5, p7 are the same.
Step 4: the demura data that needs compensation is calculated.
The calibration curve is B, and the ideal calibration curve for correction is a, and at a certain gray level, for example, the G2 gray level is l2 at the luminance corresponding to the calibration curve B, and the reference ideal calibration curve a is the G1 point at the luminance corresponding to the luminance, and if the corrected screen emits the luminance of l2, the G2 gray level needs to be corrected to be G1.
Through the application example, the original GAMMA is calibrated based on dynamic binding point selection, and the defective screen is demura according to the reference GAMMA, so that the yield of the production line can be greatly improved, and the method has the following main advantages: the normalization operation is adopted, the data range is reduced, and the free dynamic binding points are adopted, so that the problem of uneven compensation at low gray scale and high gray scale is effectively solved.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a brightness curve calibration device for realizing the above related brightness curve calibration method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation in the embodiments of the device for calibrating a luminance curve provided below may be referred to the limitation of the method for calibrating a luminance curve hereinabove, and will not be described herein.
In one embodiment, as shown in fig. 8, there is provided a brightness curve calibration device, including: an original brightness calibration module 801, a brightness gray scale calibration module 802, an auxiliary calibration selection module 803 and a brightness curve calibration module 804, wherein:
the original brightness calibration module 801 is configured to obtain a brightness gray scale original calibration point set corresponding to a pixel;
a brightness gray scale calibration module 802, configured to determine a plurality of brightness gray scale calibration points selected from a brightness gray scale original calibration point set;
an auxiliary calibration selection module 803, configured to select an auxiliary calibration point constrained by the luminance values and the gray values of two adjacent luminance gray scale calibration points;
the luminance curve calibration module 804 is configured to calibrate a luminance curve of the pixel based on the two adjacent luminance gray scale calibration points and the corresponding auxiliary calibration points if the auxiliary calibration points enable a broken line connecting the two adjacent luminance gray scale calibration points and the auxiliary calibration points to meet a preset luminance error condition.
In one embodiment, the auxiliary calibration selection module 803 is further configured to obtain a first luminance gray scale calibration point with a minimum gray scale value and a second luminance gray scale calibration point with a maximum gray scale value from the plurality of luminance gray scale calibration points; acquiring a first auxiliary calibration point constrained by the brightness value and the gray value of a first brightness gray scale calibration point, a brightness value and a gray value of a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point, and a second auxiliary calibration point constrained by the brightness value and the gray value of a brightness gray scale calibration point adjacent to the second brightness gray scale calibration point; the first auxiliary calibration point and the second auxiliary calibration point are taken as selected auxiliary calibration points.
In one embodiment, the auxiliary calibration selection module 803 is further configured to obtain a first gray-scale value and a first luminance value corresponding to a first luminance gray-scale calibration point, and a second gray-scale value and a second luminance value corresponding to a luminance gray-scale calibration point adjacent to the first luminance gray-scale calibration point; determining a gray scale interval based on the first gray scale value, the second gray scale value and a pre-configured gray scale coefficient, and acquiring a constraint gray scale value from the gray scale interval; determining a brightness value interval according to the constraint gray level value, the first brightness value and the second brightness value, and selecting a constraint brightness value from the brightness value interval; and obtaining a first auxiliary calibration point according to the constraint gray level value and the constraint brightness value.
In one embodiment, the auxiliary calibration selection module 803 is further configured to obtain a first luminance gray scale point according to the first luminance value and the second luminance value, and the first gray scale value and the second gray scale value, and a luminance connecting line between luminance gray scale points adjacent to the first luminance gray scale point; determining an initial brightness value corresponding to the constraint gray scale value according to the brightness connection line; and obtaining a pre-configured brightness gain coefficient, and determining a brightness value interval by utilizing the initial brightness value and the brightness gain coefficient.
In one embodiment, the number of auxiliary calibration points constrained by the luminance values and gray values of two adjacent luminance gray scale calibration points is a plurality; the brightness curve calibration module 804 is further configured to select a verification calibration point located between two adjacent brightness gray scale calibration points from the brightness gray scale original calibration point set; obtaining folding lines connecting each auxiliary calibration point and two adjacent brightness gray scale calibration points to obtain a plurality of candidate folding lines; acquiring brightness values of gray scale values corresponding to verification calibration points on each candidate folding line, and determining brightness value errors of each candidate folding line according to the brightness values on each candidate folding line and the brightness values represented by the verification calibration points; and taking the candidate broken line with the minimum brightness value error as the broken line meeting the preset brightness error condition.
In one embodiment, the original brightness calibration module 801 is further configured to obtain a plurality of gray-scale values preset for the pixels; gamma correction processing is carried out on each preset gray level value, so that brightness values corresponding to each preset gray level value are obtained; and carrying out normalization processing on the brightness values, and constructing a brightness gray scale original calibration point set based on the normalized brightness values and each gray scale value.
In one embodiment, the pixels are display pixels comprised by the display device to be corrected; luminance curve calibration device still includes: the brightness curve correction module is used for obtaining brightness curves respectively calibrated by all display pixels contained in the display equipment to be corrected; determining a reference brightness curve from the respectively calibrated brightness curves; and correcting the brightness curves calibrated by the display pixels respectively based on the reference brightness curves.
The modules in the brightness curve calibration device can be realized in whole or in part by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 9. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a brightness curve calibration method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by persons skilled in the art that the architecture shown in fig. 9 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
The user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (11)

1. A method for calibrating a brightness curve, the method comprising:
acquiring a brightness gray scale original calibration point set corresponding to a pixel;
determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points.
2. The method of claim 1, wherein selecting the auxiliary calibration point constrained by the luminance values and the gray scale values of the two adjacent luminance gray scale calibration points comprises:
acquiring a first brightness gray scale standard point with the minimum gray scale value and a second brightness gray scale standard point with the maximum gray scale value from the plurality of brightness gray scale standard points;
acquiring a first auxiliary calibration point constrained by a first brightness gray scale calibration point, a brightness value and a gray scale value of a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point, and a second auxiliary calibration point constrained by a brightness value and a gray scale value of a brightness gray scale calibration point adjacent to the second brightness gray scale calibration point;
and taking the first auxiliary calibration point and the second auxiliary calibration point as the selected auxiliary calibration points.
3. The method of claim 2, wherein the obtaining a first auxiliary calibration point constrained by the luminance value and the gray value of a first luminance gray scale calibration point, a luminance gray scale calibration point adjacent to the first luminance gray scale calibration point, comprises:
acquiring a first gray scale value and a first brightness value corresponding to the first brightness gray scale calibration point, and a second gray scale value and a second brightness value corresponding to a brightness gray scale calibration point adjacent to the first brightness gray scale calibration point;
Determining a gray scale interval based on the first gray scale value, the second gray scale value and a pre-configured gray scale coefficient, and acquiring a constraint gray scale value from the gray scale interval;
determining a brightness value interval according to the constraint gray scale value, the first brightness value and the second brightness value, and selecting a constraint brightness value from the brightness value interval;
and obtaining the first auxiliary calibration point according to the constraint gray scale value and the constraint brightness value.
4. A method according to claim 3, wherein determining a luminance value interval from the gray-scale value, the first luminance value and the second luminance value of the first auxiliary calibration point comprises:
obtaining a brightness connecting line between the first brightness gray scale calibration points and the brightness gray scale calibration points adjacent to the first brightness gray scale calibration points according to the first brightness value and the second brightness value and the first gray scale value and the second gray scale value;
determining an initial brightness value corresponding to the constraint gray scale value according to the brightness connecting line;
and obtaining a pre-configured brightness gain coefficient, and determining the brightness value interval by using the initial brightness value and the brightness gain coefficient.
5. The method of claim 1, wherein the number of auxiliary calibration points constrained by the luminance values and gray scale values of two adjacent luminance gray scale calibration points is a plurality;
If the auxiliary calibration point makes the broken line connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration point meet the preset brightness error condition, calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points, including:
selecting verification calibration points between the two adjacent brightness gray scale calibration points from the brightness gray scale original calibration point set;
obtaining folding lines connecting each auxiliary calibration point with the two adjacent brightness gray scale calibration points to obtain a plurality of candidate folding lines;
acquiring brightness values of gray scale values corresponding to the verification calibration points on each candidate folding line, and determining brightness value errors of each candidate folding line according to the brightness values on each candidate folding line and the brightness values represented by the verification calibration points;
and taking the candidate broken line with the minimum brightness value error as the broken line meeting the preset brightness error condition.
6. The method of claim 1, wherein the obtaining the set of brightness gray-scale original calibration points corresponding to the pixels comprises:
acquiring a plurality of gray scale values preset for the pixels;
gamma correction processing is carried out on each preset gray scale value, and brightness values corresponding to the preset gray scale values are obtained;
And carrying out normalization processing on the brightness values, and constructing the brightness gray scale original calibration point set based on the normalized brightness values and the gray scale values.
7. The method of claim 1, wherein the pixel is a display pixel comprised by a display device to be corrected;
after the brightness curve of the pixel is calibrated, the method further comprises the following steps:
acquiring brightness curves respectively calibrated by display pixels contained in the display equipment to be corrected;
determining a reference brightness curve from the respectively calibrated brightness curves;
and correcting the brightness curves calibrated by the display pixels respectively based on the reference brightness curves.
8. A brightness curve calibration device, the device comprising:
the original brightness calibration module is used for acquiring a brightness gray scale original calibration point set corresponding to the pixel;
the brightness gray scale calibration module is used for determining a plurality of brightness gray scale calibration points selected from the brightness gray scale original calibration point set;
the auxiliary calibration selection module is used for selecting an auxiliary calibration point constrained by the brightness value and the gray scale value of two adjacent brightness gray scale calibration points;
and the brightness curve calibration module is used for calibrating the brightness curve of the pixel based on the two adjacent brightness gray scale calibration points and the corresponding auxiliary calibration points if the auxiliary calibration points enable the folding lines connecting the two adjacent brightness gray scale calibration points and the auxiliary calibration points to meet the preset brightness error condition.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
11. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
CN202210153616.7A 2022-02-18 2022-02-18 Brightness curve calibration method, device, computer equipment and storage medium Pending CN116665591A (en)

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