CN117198185A - Display screen pixel level correction method and component based on gray level transfer function - Google Patents
Display screen pixel level correction method and component based on gray level transfer function Download PDFInfo
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Abstract
The invention provides a display screen pixel level correction method and a component based on a gray level transfer function, wherein the method comprises the following steps: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level; according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value. The invention bypasses the complex GAMMA conversion step between the display screen and the imaging equipment by establishing the gray level transfer function mapping, can greatly reduce the calculation force requirement for the point-by-point correction of the brightness of the display screen sub-pixels, and improves the production efficiency of the display screen assembly line.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display screen pixel level correction method and a display screen pixel level correction component based on a gray level transfer function.
Background
With the development of display technology, new display devices such as OLED (Organic Light-Emitting Diode), mini-LED (mini-Light Emitting Diode) and micro-LED (micro-Light Emitting Diode) are gradually replacing mature LCD (Liquid Crystal Display ) display devices. The emerging display technologies such as OLED have larger improvement in contrast ratio, response time, color gamut coverage, peak brightness and the like, but the phenomenon of uneven picture brightness and chromaticity of a display screen is caused by the mutually independent characteristics of each pixel or partitioned backlight, and the uneven aging conditions of different pixels and backlight can further aggravate the uneven phenomenon along with the increase of the service time.
Aiming at the phenomenon, when the brightness correction of the display screen is carried out in the prior art, the brightness and gray scale mapping of the camera and the display screen are required to be converted by GAMMA, the correction steps are long, and the production line production efficiency is not improved.
Disclosure of Invention
The invention provides a display screen pixel level correction method and a component based on a gray level transfer function, which are used for solving the defects that the correction steps are long and the production efficiency of a production line is not improved in the prior art, and by establishing a gray level transfer function mapping, the complex GAMMA conversion step between a display screen and imaging equipment is bypassed, so that the calculation force requirement on the brightness point-by-point correction of the display screen sub-pixels can be greatly reduced, and the production efficiency of the production line of the display screen is improved.
The invention provides a display screen pixel level correction method based on a gray level transfer function, which comprises the following steps: acquiring an actual brightness value of each sub-pixel point in a display area of the display screen under a preset gray level; and determining a brightness correction value based on a gray-scale transfer function according to the actual brightness value, so as to correct the brightness of each sub-pixel point according to the brightness correction value.
According to the method for correcting the pixel level of the display screen based on the gray level transfer function provided by the invention, the method for obtaining the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray level comprises the following steps: and shooting the display screen by adopting a correction device, and obtaining the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray scale based on a preset machine vision algorithm and a preset threshold segmentation algorithm.
According to the display screen pixel level correction method based on the gray level transfer function, the resolution of the correction device is larger than that of the display screen.
According to the display screen pixel level correction method based on the gray level transfer function, the correction device is an imaging brightness meter or an area array camera.
According to the display screen pixel level correction method based on the gray level transfer function provided by the invention, the brightness correction value is determined based on the gray level transfer function according to the actual brightness value, and the method comprises the following steps: determining a correction coefficient based on the gray-scale transfer function, wherein the correction coefficient is used for representing the corresponding relation between an actual brightness value and a theoretical brightness value, and the correction coefficient is as follows:
wherein G is k (i) A gray level value of the point with the color and the position number i at the kth gray level, B k (i) The brightness value of the point with the color and the position number i in the kth gray scale is K (i), the theoretical brightness value of each sub-pixel point is taken as an x axis, the actual brightness value is the slope of a fitting straight line of a y axis, and n is the total gray scale number; determining a theoretical brightness value according to the actual brightness value and the correction coefficient; and obtaining the brightness correction value according to the actual brightness value and the theoretical brightness value.
According to the display screen pixel level correction method based on the gray level transfer function provided by the invention, the theoretical brightness value is determined according to the actual brightness value and the correction coefficient, and the method comprises the following steps: obtaining the theoretical brightness value based on a first preset formula according to the actual brightness value and the correction coefficient; the first preset formula is:
wherein G (i)' is the theoretical luminance value, K is the correction coefficient, and B (i) is the actual luminance value.
According to the display screen pixel level correction method based on the gray level transfer function provided by the invention, the brightness correction value is obtained according to the actual brightness value and the theoretical brightness value, and the method comprises the following steps: obtaining the brightness correction value based on a second preset formula according to the actual brightness value and the theoretical brightness value; the second preset formula is:
ΔG(i)＝|B(i)-G(i)′|
wherein G (i)' is the theoretical luminance value, G (i) is the actual luminance value, and Δg (i) is the luminance correction value.
According to the display screen pixel level correction method based on the gray level transfer function, the display area comprises a plurality of sub correction areas.
The invention also provides a display screen pixel level correction system based on the gray level transfer function, which comprises: the actual brightness acquisition module is used for acquiring the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray level; and the brightness correction module is used for determining a brightness correction value based on a gray level transfer function according to the actual brightness value so as to correct the brightness of each sub-pixel point according to the brightness correction value.
The invention also provides an imaging brightness meter suitable for the display screen pixel level correction method based on the gray level transfer function, which comprises the following steps: the fixed focus standard objective lens, the diaphragm, three color filters matched with CIE tristimulus value curves, the color filter turntable, the motor and the CCD camera are sequentially arranged.
The invention provides a display screen pixel level correction method and a component based on a gray level transfer function, wherein the method comprises the following steps: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level; according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value. The invention bypasses the complex GAMMA conversion step between the display screen and the imaging equipment by establishing the gray level transfer function mapping, can greatly reduce the calculation force requirement for the point-by-point correction of the brightness of the display screen sub-pixels, and improves the production efficiency of the display screen assembly line.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a gray scale transfer function based display screen pixel level correction method provided by the invention;
FIG. 2 is a schematic flow chart of a method for correcting a pixel level of a display screen based on a gray level transfer function according to the present invention;
FIG. 3 is a schematic diagram of a gray level transfer function based display screen pixel level correction system according to the present invention;
FIG. 4 is a schematic diagram of the structure of an imaging brightness meter provided by the invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes a display screen pixel level correction method and components based on a gray level transfer function according to the present invention with reference to fig. 1 to 5.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for correcting a pixel level of a display screen based on a gray level transfer function according to the present invention.
Referring to fig. 2, fig. 2 is a specific flow chart of a method for correcting a pixel level of a display screen based on a gray level transfer function according to the present invention.
The invention provides a display screen pixel level correction method based on a gray level transfer function, which comprises the following steps:
101: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level;
as a preferred embodiment, obtaining an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray scale includes: and shooting the display screen by adopting the correction device, and obtaining the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray scale based on a preset machine vision algorithm and a preset threshold segmentation algorithm.
As a preferred embodiment, the resolution of the correction means is greater than the resolution of the display screen.
As a preferred embodiment, the correction means is an imaging brightness meter or an area camera.
Specifically, the shooting processes can be performed in a darkroom environment, the resolution of the display screen to be corrected needs to be determined first, then an imaging brightness meter or an area camera with the resolution higher than that of the display screen to be corrected is selected, for example, the number of pixels of the correction device in the xy direction should be greater than 2 times of the number of pixels of the display screen in the xy direction.
Then the display screen to be corrected is placed in a preset area of the correction device, such as the center of the picture, and the edge remains more than 10%. The focal length of the correction device is adjusted to enable the imaging of pixels of the display screen to be clear, if the pixel spacing is too small to distinguish, the sub-pixels of the screen can be lightened at intervals when the screen is imaged, the whole screen is covered by imaging for many times, for example, the screen is divided into small blocks with 2x2 pixels, the sub-pixels at the upper left corner in all the small blocks are lightened by imaging for the first time, the sub-pixels at the upper right corner are lightened by imaging for the second time, and the like.
The display screen sequentially lights up 32, 64, 128, 192 and 255 gray level uniform pictures of R, G and B pictures, which is recommended point selection, and the number of point selection can be increased or decreased appropriately according to actual situations. And then using a correction device to shoot a screen body, extracting brightness image data, namely actual brightness values, of each sub-pixel point in each RGB picture, and generating a matrix consistent with pixel arrangement.
It should be noted that the camera exposure time should be adjusted during imaging so that the maximum gray value for imaging the screen does not exceed 90% of the maximum value (typically 255).
In addition, when the luminance value of each sub-pixel is extracted, the approximate area of each pixel may be determined by machine vision, and may be implemented by, for example, a fuzzy aggregation method, an adaptive boundary search method, or the like. The fuzzy clustering method is to analyze and judge whether an uncertain part in the image edge is a background or a target according to the related principle of a fuzzy logic system. The self-adaptive boundary searching method is to find out the outline or edge meeting the corresponding condition or a certain format by using elements such as horizontal or vertical straight lines, searching and positioning the positions of the lamp points.
Moreover, considering that each sub-pixel of the screen often corresponds to more than one camera pixel, the luminance value of each sub-pixel needs to be obtained by a suitable definition method, for example, a method of averaging after threshold segmentation is used, and the algorithm is optimized based on two algorithms of a maximum luminance method and a luminance addition method. Typically, the brightness value of the display screen is the sum of the brightness of the high brightness area and the brightness of the edge area, so the algorithm fully considers the complex and changeable characteristic of the edge brightness and also realizes the importance of the high brightness area. The flow of calculating brightness by the threshold segmentation method is to calculate the segmentation threshold after locating and determining the point with the maximum brightness value in the pixel, and the calculation formula in the threshold segmentation method is as follows: the threshold a=maximum luminance/b, b is typically 4 to 5.
Of course, the correction device can also select an area array camera, and each photosensitive pixel unit can measure the brightness of the corresponding micro surface element of the surface light source to be measured according to the object-image conjugation relationship, and uniformity calibration is needed before use.
102: according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value.
As a preferred embodiment, determining the luminance correction value based on the gray-scale transfer function from the actual luminance value includes: determining a correction coefficient based on the gray level transfer function, wherein the correction coefficient is used for representing the corresponding relation between an actual brightness value and a theoretical brightness value, and is as follows:
wherein G is k (i) A gray level value of the point with the color and the position number i at the kth gray level, B k (i) The brightness value of the point with the color and the position number i in the kth gray scale is K (i), the theoretical brightness value of each sub-pixel point is taken as an x axis, the actual brightness value is the slope of a fitting straight line of a y axis, and n is the total gray scale number; determining a theoretical brightness value according to the actual brightness value and the correction coefficient; and obtaining a brightness correction value according to the actual brightness value and the theoretical brightness value.
Specifically, the invention uses a gray-scale transfer function to fit the slope under the double-logarithmic scale to obtain the K (i) coefficient of each sub-pixel point at the corresponding position of the RGB picture. The effect caused by dark current can be greatly reduced by using pictures with higher gray scale brightness, and meanwhile, the brightness values caused by dark current in the forward and reverse conversion process can be offset to a certain extent, so that the brightness above 32 gray scales is enough to fit a more accurate K (i) value.
As a preferred embodiment, determining the theoretical luminance value from the actual luminance value and the correction coefficient includes: obtaining a theoretical brightness value based on a first preset formula according to the actual brightness value and the correction coefficient; the first preset formula is:
where G (i)' is a theoretical luminance value, K is a correction coefficient, and B (i) is an actual luminance value.
As a preferred embodiment, obtaining the luminance correction value from the actual luminance value and the theoretical luminance value includes: obtaining a brightness correction value based on a second preset formula according to the actual brightness value and the theoretical brightness value; the second preset formula is:
ΔG(i)＝|B(i)-G(i)′|
where G (i)' is a theoretical luminance value, B (i) is an actual luminance value, and Δg (i) is a luminance correction value.
Specifically, the theoretical brightness value can be obtained through a first preset formula, the brightness value which should be corrected for the pixel point at present is obtained according to a second preset formula, a matrix corresponding to the pixel point one by one is established, and the matrix is applied to the output gray scale value, so that the rapid point-by-point correction of the screen brightness can be realized.
For example, when the brightness of the input signal is 100 and the corresponding brightness after the back-pushing recorded by the camera is 105, the corrected brightness of the input signal should be 95.
The precondition for this calibration method is that all pixels have EOTF curves of approximately power values, but differ in brightness, which is also the most common source of non-uniformity for display pixels. Therefore, the method has the advantages that a small number of gray values can cover the whole gray range, the calibration calculation amount is small, and the method is not influenced by the GAMMA values of the display and the camera.
As a preferred embodiment, the display area comprises a plurality of sub-correction areas.
Specifically, for the display screen with too high pixel number or the condition of insufficient pixel number of the camera, the display screen can be further displayed in a blocking mode, namely the display area is divided into a plurality of sub-correction areas, the plurality of sub-correction areas are calibrated and then spliced to obtain a full-screen calibration matrix, and the full-screen calibration matrix is applied to the output gray scale values, so that the brightness of the display screen with separate display can be corrected point by point rapidly.
The beneficial effects of the invention are as follows:
(1) Parameters which have influence on point-by-point correction such as imaging non-uniformity of a camera, dark current influence of a display screen and the camera, GAMMA values of the display screen and the camera and can be coupled with each other are summarized by a value of K (i), camera built-in parameters are not required to be obtained, calculation flow is simplified, and universality is strong;
(2) The calibration result is output in a matrix form, the implementation method is simple, and the calculated amount is greatly reduced compared with other calibration schemes;
(3) Only a gray level transfer function fitting method is used, the method is easy to understand and realize, a fitting relation can be built for the whole brightness range by testing a small amount of brightness values, and any brightness value can be adapted;
(4) The imaging type brightness meter adapting to the algorithm is developed, and the brightness and chromaticity measurement accuracy of the imaging type brightness meter is improved by optimizing the color filter transmission spectrum.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a gray level transfer function-based display screen pixel level correction system according to the present invention.
The invention also provides a display screen pixel level correction system based on the gray level transfer function, which comprises: the actual brightness obtaining module 1 is used for obtaining an actual brightness value of each sub-pixel point in a display area of the display screen under a preset gray level; and a brightness correction module 2 for determining a brightness correction value based on the gray-scale transfer function according to the actual brightness value to correct the brightness of each sub-pixel point according to the brightness correction value.
For the description of the system for correcting the pixel level of the display screen based on the gray-scale transfer function provided by the present invention, refer to the above method embodiment, and the description of the present invention is omitted herein.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an imaging brightness meter according to the present invention.
The invention also provides an imaging brightness meter suitable for the display screen pixel level correction method based on the gray level transfer function, which comprises the following steps: the Device comprises a fixed focus standard objective lens, a diaphragm, three color filters matched with CIE (Commission Internationalede L' Eclairage, international Commission on illumination) tristimulus value curves, a color filter turntable, a motor and a CCD (Charge-Coupled Device) camera which are sequentially arranged.
Of course, in order to better adapt the correction method, the invention also provides a filter type imaging brightness meter suitable for the method. The fixed focus standard objective lens accurately images the plane light source to be measured on a light sensitive surface, the diaphragm is responsible for shielding stray light, the motor controls the color filter to switch, three color filters matched with the CIE tristimulus value curve filter tristimulus value components of the light source, and the CCD camera collects tristimulus value images. The CCD camera is a two-dimensional image sensor and consists of a CCD photosensitive chip, a peripheral driving circuit and an image data processing module. The core element CCD is called a charge coupled device, the minimum structural unit is a metal-oxide-semiconductor capacitor (Metal oxide semiconductor, MOS), and the photoelectric effect is utilized to convert optical signals into electric signals. The working flow is as follows: the peripheral driving circuit exposes the CCD photosurface for a certain time according to the set parameters. Each photosensitive pixel of the CCD generates a corresponding amount of charge according to the magnitude of received light energy within the exposure time. The peripheral driving circuit controls charge packets in the photosensitive pixels to be sequentially transferred to adjacent pixels, and of course, the types of color filters on the color filter runner can be further increased to adapt to the brightness uniformity correction requirements of special display devices such as infrared and the like. The electric signal of the whole photosurface is obtained by means of line scanning or column scanning. The image data processing module converts the electrical signals into a standard image transmission format, such as a RAW format. The higher the resolution of the CCD camera, the higher the accuracy of the resulting image plane illuminance distribution at the same photosurface size. Typically, the resolution of a CCD camera can reach millions of pixels, while the resolution of a high-end CCD camera can reach tens of millions of pixels.
The imaging type luminance meter can be approximately equivalent to millions of aiming type luminance colorimeters with the same tristimulus value spectral response, the plane of the display screen is flatly placed on a surface to be tested during testing, and the light of the display screen can be imaged on a calibrated high-resolution CCD or CMOS (Complementary Metal Oxide Semiconductor ) sensor through a lens and an optical filter. The filter is provided with an XYZ tristimulus value color filter group and a vacancy is reserved. By switching the color filters, the camera respectively acquires tristimulus value distribution gray level diagrams, the software processes three original images through an algorithm to measure the brightness and chromaticity distribution of an object plane, and the color development effect which is closer to human eyes is achieved, so that the accuracy of chromaticity can be ensured at the same time after the brightness is calibrated through the method, and the chromaticity calibration flow is simplified.
For an introduction of the imaging brightness meter provided by the present invention, refer to the above method embodiment, and the present invention is not described herein.
Fig. 5 illustrates a physical schematic diagram of an electronic device, as shown in fig. 5, which may include: a processor (processor) 501, a communication interface (Communications Interface) 502, a memory (memory) 503 and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other via the communication bus 504. The processor 501 may invoke logic instructions in the memory 503 to perform a method of display screen pixel level correction based on gray level transfer functions, the method comprising: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level; according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value.
Further, the logic instructions in the memory 503 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program, when executed by a processor, can perform a method for correcting a pixel level of a display screen based on a gray level transfer function provided by the above methods, where the method includes: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level; according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method for gray scale transfer function based display screen pixel level correction provided by the above methods, the method comprising: acquiring an actual brightness value of each sub-pixel point in a display area of a display screen under a preset gray level; according to the actual luminance value, a luminance correction value is determined based on the gradation transfer function to correct the luminance of each sub-pixel point according to the luminance correction value.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The display screen pixel level correction method based on the gray level transfer function is characterized by comprising the following steps of:
acquiring an actual brightness value of each sub-pixel point in a display area of the display screen under a preset gray level;
and determining a brightness correction value based on a gray-scale transfer function according to the actual brightness value, so as to correct the brightness of each sub-pixel point according to the brightness correction value.
2. The method for correcting a pixel level of a display screen based on a gray level transfer function according to claim 1, wherein the obtaining an actual brightness value of each sub-pixel point in a display area of the display screen under a preset gray level comprises:
and shooting the display screen by adopting a correction device, and obtaining the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray scale based on a preset machine vision algorithm and a preset threshold segmentation algorithm.
3. The gray scale transfer function based display screen pixel level correction method of claim 2, wherein the resolution of the correction means is greater than the resolution of the display screen.
4. The method of claim 2, wherein the correction device is an imaging brightness meter or an area camera.
5. The gray scale transfer function-based display screen pixel level correction method according to any one of claims 1 to 4, wherein said determining a luminance correction value based on a gray scale transfer function from said actual luminance value comprises:
determining a correction coefficient based on the gray-scale transfer function, wherein the correction coefficient is used for representing the corresponding relation between an actual brightness value and a theoretical brightness value, and the correction coefficient is as follows:
wherein G is k (i) A gray level value of the point with the color and the position number i at the kth gray level, B k (i) The brightness value of the point with the color and the position number i in the kth gray scale is K (i), the theoretical brightness value of each sub-pixel point is taken as an x axis, the actual brightness value is the slope of a fitting straight line of a y axis, and n is the total gray scale number;
determining a theoretical brightness value according to the actual brightness value and the correction coefficient;
and obtaining the brightness correction value according to the actual brightness value and the theoretical brightness value.
6. The gray scale transfer function based display screen pixel level correction method of claim 5, wherein said determining a theoretical luminance value based on said actual luminance value and said correction factor comprises:
obtaining the theoretical brightness value based on a first preset formula according to the actual brightness value and the correction coefficient;
the first preset formula is:
wherein G (i)' is the theoretical luminance value, K is the correction coefficient, and B (i) is the actual luminance value.
7. The method for correcting a pixel level of a display screen based on a gray scale transfer function according to claim 5, wherein said obtaining the luminance correction value based on the actual luminance value and the theoretical luminance value comprises:
obtaining the brightness correction value based on a second preset formula according to the actual brightness value and the theoretical brightness value;
the second preset formula is:
ΔG(i)＝|B(i)-G(i) ′ |
wherein G (i)' is the theoretical luminance value, B (i) is the actual luminance value, and Δg (i) is the luminance correction value.
8. The gray scale transfer function based display screen pixel level correction method of claim 1, wherein the display area comprises a plurality of sub-correction areas.
9. A gray scale transfer function based display screen pixel level correction system, comprising:
the actual brightness acquisition module is used for acquiring the actual brightness value of each sub-pixel point in the display area of the display screen under the preset gray level;
and the brightness correction module is used for determining a brightness correction value based on a gray level transfer function according to the actual brightness value so as to correct the brightness of each sub-pixel point according to the brightness correction value.
10. An imaging luminance meter adapted to the gray-scale transfer function-based display screen pixel level correction method according to any one of claims 1 to 8, comprising: the fixed focus standard objective lens, the diaphragm, three color filters matched with CIE tristimulus value curves, the color filter turntable, the motor and the CCD camera are sequentially arranged.
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