CN116504178B - LED screen module consistency correction method, computer equipment and readable storage medium - Google Patents
LED screen module consistency correction method, computer equipment and readable storage medium Download PDFInfo
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Abstract
The invention relates to the field of LED image analysis and calibration, in particular to a method for correcting consistency of an LED screen module, computer equipment and a readable storage medium.
Description
Technical Field
The invention relates to the field of LED image analysis and calibration, in particular to a method for correcting consistency of an LED screen module, computer equipment and a readable storage medium.
Background
LED (Light Emitting Diode) display screen is a high-brightness, high-definition and high-reliability display device widely applied to indoor and outdoor occasions. However, due to the manufacturing process of the LED screen module and environmental factors, there may be differences in display parameters such as brightness and color between different modules, which may affect the display effect and look and feel of the entire LED display screen. To solve this problem, LED screen module uniformity correction is required. The consistency correction of the LED screen module means that the overall display effect of the LED display screen is more consistent and stable by adjusting and correcting the display parameters of different modules. The curved LED screen is a novel display device, has the characteristics of flexibility, thinness and the like, and is suitable for various complex scenes and applications.
Chinese patent grant publication number CN104332114B discloses a bendable LED module comprising: an elastic component layer, wherein the elastic component layer is provided with a plurality of luminous components; the adjusting part acts on the back of the elastic component layer, the adjusting part tightens or tightens the two sides of the elastic component layer, so that the elastic component layer is bent in an inner arc or an outer arc, and a larger gap or a gap between luminous components can not appear after the elastic component layer is bent and deformed, so that the display effect is better. Chinese patent grant publication No. CN115690065A discloses a method for correcting consistency of LED screen modules, which comprises the steps of obtaining comparison image sets of the LED screen in different comparison color states, and positioning positions of a target module and a reference module according to the comparison image sets; acquiring a first test image set of the LED screen in different test color states, extracting a first target image set of the target module and a first reference image set of the reference module, and rapidly adjusting the color gamut value of the target module; the method comprises the steps of obtaining a second test image set of the LED screen in different test color states after rapid adjustment, extracting a second target image set of a target module and a second reference image set of a reference module, and fine-tuning the color gamut value of the target module according to the second target image set and the second reference image set.
The difference between the curved LED screen and the conventional LED screen is that the brightness is inconsistent due to different visual angles, so that the brightness inconsistency caused by the visual angles to the curved LED screen is not considered in the prior art, and the brightness consistency correction to the curved LED screen is lacking.
Disclosure of Invention
Therefore, the invention provides a method and a device for correcting the uniformity of an LED screen module, which are used for solving the technical problems that the brightness inconsistency of a bent LED screen caused by a visual angle is not considered and the brightness uniformity correction of the bent LED screen is lacked in the prior art.
In order to achieve the above object, in one aspect, the present invention provides a method for correcting consistency of LED screen modules, including:
step S1, correcting the bent LED screen for one time by using a correction module so that the brightness of all modules is the same, and respectively obtaining test images of the bent LED screen subjected to the one-time correction at a standard position and a minimum visual angle position under standard brightness by using a depth camera;
step S2, the central control processor respectively establishes brightness change functions of the standard position and the minimum view angle position test image according to the test image, calculates view angle influence characteristic values according to the two brightness change functions, and judges view angle influence level according to the view angle influence characteristic values;
step S3, if the effect level is the preset effect level, the central control processor executes a visual angle effect correction strategy to control a correction module to carry out secondary correction on the bent LED screen;
step S4, the central control processor detects the smoothness of the bent LED screen subjected to the secondary correction, and controls the correction module to carry out smoothness correction on the bent LED screen when the smoothness is at a preset smoothness level;
step S5, the central control processor executes an attenuation compensation strategy on the curved LED screen after the smoothness correction;
the primary correction is to correct the brightness of all the color development modules of the bent LED screen to be standard brightness, the secondary correction is to determine a plurality of view angles to influence the lamp points according to the brightness difference of the test images of the lamp points at the standard position and the minimum view angle position so as to calculate correction amounts for the brightness of the corresponding lamp points, and the correction modules are controlled to correct the bent LED screen according to the correction amounts; the standard position is a position which meets the minimum shooting distance and is right to the curved LED screen, the minimum view angle position meets the minimum shooting distance and is positioned at the limit view angle, and the attenuation compensation strategy is to finely adjust the brightness of the curved LED screen by combining an attenuation index;
the preset influence level meets the condition that the visual angle influence characteristic value is larger than the standard influence value;
the shooting distance is the distance between a depth camera and the geometric center of the curved LED screen, and the limit view angle and the attenuation index are related to the original data of the curved LED screen.
Further, in the step S2, the standard position and minimum view angle position test images have brightness change functionsFor the mapping relation between the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the standard position, the brightness change function of the minimum view angle position>Mapping the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the minimum view angle positionRelationship.
Further, in the step S2, the viewing angle influence characteristic value K is calculated by the formula (1);
（1）
wherein ,for the first conversion factor, β is the second conversion factor, +.>＞β＞0；/>For the minimum viewing angle position and the minimum distance between the light points, < >>Is the maximum distance between the standard position and the lamp point, < >>Representation->Slope function of>Representation->Is a slope function of (a).
Further, the central control processor judges the influence level of the view angle on the brightness of the curved LED screen according to the view angle influence characteristic value, and if the influence level is preset, the central control processor executes the view angle influence correction strategy;
the visual angle influence correction strategy is to judge a plurality of visual angle influence lamp points according to the brightness difference of the lamp points in the standard position and the minimum visual angle position test image, and calculate the correction amount of the brightness of the lamp points according to the visual angle influence function;
the brightness difference of the test image of the visual angle influence lamp point at the standard position and the minimum visual angle position is larger than the standard brightness difference, and the standard brightness difference is positively correlated with the visual angle influence characteristic value.
Further, a correction amount of the ith view angle influence lamp point is calculated according to the view angle influence function，Is determined by formula (2);
（2）
wherein ,a viewing angle influence function value corresponding to the distance between the ith viewing angle influence lamp point and the standard position,/for the ith viewing angle influence lamp point>For the angle between the connection line of the ith visual angle influence lamp point and the standard position and the tangent plane of the ith visual angle influence lamp point, +.>For the included angle between the connection line of the ith visual angle influence lamp point and the minimum visual angle position and the tangent plane of the ith visual angle influence lamp point, M is the color influence conversion coefficient, and the visual angle influence function is->。
Further, in the step S4, the central control processor performs a smoothness detection policy on the secondarily corrected curved LED screen to determine a smoothness level;
and the smoothness detection strategy is to shoot a smoothness test image of the bent LED screen after the secondary correction at a standard position by using a depth camera, calculate the standard deviation of brightness of a plurality of light points of a single row and a single column in the smoothness test image, calculate the average value of the standard deviation of brightness of all the rows and columns and record the average value as the smoothness of the bent LED screen.
Further, in the step S4, if the smoothness is a preset smoothness level, the central control processor controls the correction module to perform smoothness correction on the curved LED screen;
wherein the smoothness correction is to reduce the luminance of the light points in the single row or the single column having a luminance higher than the standard luminance and a luminance difference of more than 10% to the average luminance of the light points in the single row or the single column;
and the preset smoothness level satisfies that smoothness is larger than a smoothness threshold, and the smoothness threshold is positively correlated with the total amount of the light points contained in the LED screen.
Further, in the step S5, the central control processor calculates a brightness fine adjustment amount according to the attenuation index and the view angle influence characteristic value, and controls the correction module to increase brightness of all the light points by the brightness fine adjustment amount;
wherein the brightness fine adjustment is positively correlated with the decay index and negatively correlated with the viewing angle influence characteristic value;
the attenuation index is the attenuation degree of the brightness of the bent LED screen along with the service time, and the service time is positively related to the attenuation index.
In another aspect, the present invention provides a LED screen module uniformity correction computer device, comprising:
the depth camera is a structured light depth camera and is used for shooting a plurality of test images of the bent LED screen.
The central control processor is an embedded processor and is used for judging the correction mode of the correction module according to the test image shot by the depth camera;
the correction module is used for carrying out primary correction, secondary correction and smoothness correction on each module of the LED screen according to the correction mode determined by the central control processor;
the primary correction is to correct the brightness of all the color development modules of the LED screen to the standard brightness;
the secondary correction is to judge that a plurality of visual angles influence the lamp points according to the brightness difference of the lamp points in the standard position and the minimum visual angle position test image, calculate the correction amount of the brightness of the lamp points according to the visual angle influence function, and control the correction module to correct the bent LED screen according to the correction amount;
the smoothness correction is to reduce the luminance of the light points in the single row or the single column having a luminance higher than the standard luminance and a luminance difference of more than 10% to the average luminance of the light points in the single row or the single column.
The invention also provides a readable storage medium for the consistency correction of the LED screen module, which is a DRAM and is used for storing test images, view angle influence characteristic values, correction information and attenuation index data for the operation and control of a central control processor and for executing the reading and/or storage operation in the consistency correction method of the LED screen module.
Compared with the prior art, the invention has the beneficial effects that the technical problems that the brightness inconsistency of the bent LED screen caused by the view angle is not considered in the prior art, and the brightness consistency correction of the bent LED screen is lacked are solved, and the calibration precision is improved.
Further, the invention acquires the test images of the standard position and the minimum view angle position, respectively establishes brightness change functions of the test images of the standard position and the minimum view angle position, calculates view angle influence characteristic values according to the two brightness change functions, and can accurately show the influence of the view angle on the brightness of the LED screen, wherein the smaller the value is, the smaller the view angle influence is, the better the display effect and the appearance of the bent LED screen are, and the calibration precision is further improved.
Further, the LED screen with larger visual angle influence is screened out through judging the visual angle influence level, the visual angle influence lamp points are judged, the lamp points with large influence are screened out in a targeted mode, the visual angle influence lamp points are corrected by combining the included angle and the color influence conversion coefficient, the correction amount is smaller as the color influence is larger, the influence of brightness adjustment on the color is effectively avoided, the display effect and the look and feel are improved, and the calibration precision is further improved.
Furthermore, the LED screen after secondary correction possibly has the conditions of low smoothness after correction and poor appearance although the brightness is balanced, the problem is avoided through smoothness correction, the display effect and the appearance are improved, and the correction precision is further improved.
Further, according to the invention, the central control processor calculates the brightness fine adjustment quantity according to the attenuation index and the view angle influence characteristic value, and controls the correction module to increase the brightness of all the lamp points by the brightness fine adjustment quantity, when the service time of the LED screen reaches a certain length, the brightness is attenuated along with the service time, and the brightness fine adjustment quantity is calculated by the attenuation index and the view angle influence characteristic value, so that the brightness attenuation can be neutralized on the premise of not influencing the look and feel, the service life of the LED screen is prolonged, and the correction precision is further improved.
Drawings
FIG. 1 is a flowchart of a method for LED screen module consistency correction according to an embodiment of the present invention;
FIG. 2 is a block diagram of a computer device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a curved LED screen with a standard position and a minimum viewing angle position according to an embodiment of the present invention;
in the figure: 1, standard position; 2, minimum viewing angle position; 3, cutting the surface at the point A.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; 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 invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, a flowchart of a method for calibrating consistency of an LED screen module according to an embodiment of the present invention is shown, where the method for calibrating consistency of an LED screen module includes:
step S1, correcting the bent LED screen for one time by using a correction module so that the brightness of all modules is the same, and respectively obtaining test images of the bent LED screen subjected to the one-time correction at a standard position and a minimum visual angle position under standard brightness by using a depth camera;
the correction module may select a computer vision based method, for example, implementing the correction module as an algorithm that may divide the image into a plurality of regions and correct for brightness differences in each region. Alternatively, a hardware module, such as a correction board using an LED matrix array, may be used to correct for curved LED screens by controlling the LED matrix on the correction board.
In the correction process, the curved LED screen needs to be fixed on a plane so that the curved LED screen cannot move, and then the correction module is used for adjustment so that the brightness of all the LED modules is the same.
Fig. 3 is a schematic diagram of a curved LED screen according to an embodiment of the present invention, and a standard position and a minimum viewing angle position, and a depth camera is used to obtain test images of the curved LED screen at the standard position 1 and the minimum viewing angle position 2 respectively under standard brightness. In this process, attention is paid to calibration and setting of the camera, and quality and stability of the image are ensured.
Step S2, the central control processor respectively establishes brightness change functions of the standard position and the minimum view angle position test image according to the test image, calculates view angle influence characteristic values according to the two brightness change functions, and judges view angle influence level according to the view angle influence characteristic values;
step S3, if the effect level is the preset effect level, the central control processor executes a visual angle effect correction strategy to control a correction module to carry out secondary correction on the bent LED screen;
step S4, the central control processor detects the smoothness of the bent LED screen subjected to the secondary correction, and controls the correction module to carry out smoothness correction on the bent LED screen when the smoothness is at a preset smoothness level;
step S5, the central control processor executes an attenuation compensation strategy on the curved LED screen after the smoothness correction;
the primary correction is to correct the brightness of all the color development modules of the LED screen to be the standard brightness, the secondary correction is to judge that a plurality of view angles influence the lamp points according to the brightness difference of a lamp point test image at a standard position and a minimum view angle position, calculate the correction amount of the brightness of the lamp points according to the view angle influence function, and control the correction module to correct the bent LED screen according to the correction amount, wherein the standard brightness is related to an application scene of the LED screen, the standard position is a position which meets the minimum shooting distance and is right to the bent LED screen, the minimum view angle position meets the minimum shooting distance and is at a limit view angle position, and the attenuation compensation strategy is to finely adjust the brightness of the bent LED screen by combining an attenuation index;
the preset influence level meets the condition that the visual angle influence characteristic value is larger than the standard influence value;
the shooting distance is the distance between a depth camera and the geometric center of the curved LED screen, and the limit view angle and the attenuation index are related to the original data of the curved LED screen.
The invention solves the technical problems that the brightness inconsistency of the bent LED screen caused by the view angle is not considered and the brightness consistency correction of the bent LED screen is not considered in the prior art, and improves the calibration precision.
Specifically, in the step S2, the standard position and the minimum view angle position test the brightness change function of the imageFor the mapping relation between the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the standard position, the brightness change function of the minimum view angle position>And the mapping relation between the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the minimum view angle position is obtained.
And establishing a brightness change function of the test image at the standard position and the minimum view angle position by using the brightness information of the lamp point and the distance between the camera and the lamp point. The luminance change function may be established using some image processing algorithm, such as graying, histogram equalization, filtering, etc., to process the luminance information and the distance information to establish the luminance change function.
Specifically, in the step S2, the viewing angle influence characteristic value K is calculated by the formula (1);
（1）
wherein ,for the first conversion factor, β is the second conversion factor, +.>＞β＞0；/>For the minimum viewing angle position and the minimum distance between the light points, < >>For the maximum distance between the standard position and the lamp spot, < >>Representation->Slope function of>Representation->Is a slope function of (a).
It will be appreciated that the number of components,the specific values of the values of beta and beta are not specifically set here, do not affect the trend of the characteristic values of the visual angle, and can be correspondingly set according to specific requirements, in the embodiment +.>And beta is the sum of the standard brightness and +.>Regarding the value, the present embodiment is preferably +.>=0.1，β=0.02。
Specifically, the central control processor determines the influence level of the view angle on the brightness of the curved LED screen according to the view angle influence characteristic value, and if the influence level is a preset influence level, the central control processor executes the view angle influence correction strategy;
the visual angle influence correction strategy is to judge a plurality of visual angle influence lamp points according to the brightness difference of the lamp points in the standard position and the minimum visual angle position test image, and calculate the correction amount of the brightness of the lamp points according to the visual angle influence function;
the brightness difference of the test image of the visual angle influence lamp point at the standard position and the minimum visual angle position is larger than the standard brightness difference, the standard influence value is related to the bending degree of the bending LED screen, and it can be understood that the standard influence value can be obtained by combining limited tests according to the bending degree of the bending LED screen and the process standard corresponding to the application scene of the bending LED screen by a technician, and the standard brightness difference is positively related to the visual angle influence characteristic value.
According to the invention, the test images of the standard position and the minimum view angle position are obtained, the brightness change functions of the test images of the standard position and the minimum view angle position are respectively established, the view angle influence characteristic value is calculated according to the two brightness change functions, the view angle influence characteristic value can accurately show that the brightness of the LED screen is influenced by the view angle, the smaller the value is, the smaller the view angle influence is, the better the display effect and the appearance of the bent LED screen are, and the calibration precision is further improved.
According to the invention, the LED screen with larger visual angle influence is screened out by judging the visual angle influence level, the visual angle influence lamp point is judged, the lamp point with large influence is screened out in a targeted way, the visual angle influence lamp point is corrected by combining the included angle and the color influence conversion coefficient, the larger the color influence is, the smaller the correction amount is, the influence of brightness adjustment on color is effectively avoided, the display effect and the look and feel are improved, and the calibration precision is further improved.
Firstly, according to the brightness difference of the test image of the lamp point at the standard position and the minimum view angle position, judging that the lamp point is affected by the view angle, and if the brightness difference of the test image of a certain lamp point at the standard position and the minimum view angle position is larger than the standard brightness difference, judging that the lamp point is affected by the view angle. For a lamp point affected by a viewing angle, a correction amount for its brightness is calculated using the viewing angle influence function. The visual angle influence function can be designed according to actual conditions, the bending degree of the bent LED screen and the visual angle influence characteristic value factors are generally considered, the lamp points influenced by the visual angle are corrected according to the calculated correction amount, and the correction mode can be designed according to the actual conditions.
It should be noted that in the above step, the standard luminance difference is positively correlated with the viewing angle influence characteristic value, because the viewing angle influence characteristic value reflects the degree of influence of the viewing angle on luminance, and the luminance difference is a direct representation of the viewing angle influence. Therefore, the larger the degree of influence of the viewing angle, the larger the standard luminance difference. Meanwhile, the standard influence value is related to the bending degree of the bent LED screen, because the bending degree influences the position and the viewing angle of the lamp point, thereby influencing the influence degree of the viewing angle on brightness.
Specifically, the correction amount of the ith viewing angle-affected light point is calculated from the viewing angle-affected function，Is determined by formula (2);
（2）
wherein ,a viewing angle influence function value corresponding to the distance between the ith viewing angle influence lamp point and the standard position,/for the ith viewing angle influence lamp point>For the angle between the connection line of the ith visual angle influence lamp point and the standard position and the tangent plane of the ith visual angle influence lamp point, +.>For the included angle between the connection line of the ith visual angle influence lamp point and the minimum visual angle position and the tangent plane of the ith visual angle influence lamp point, M is the color influence conversion coefficient, and the visual angle influence function is->；
With continued reference to fig. 3, point a is a view angle-influencing lamp point, wherein the tangent plane 3 of point a is the corresponding tangent plane of view angle-influencing lamp point a on the curved LED screen, and the angle between the line of the standard position 1 and point a and the tangent plane isThe angle between the connecting line of the minimum view angle position 2 and the point A and the tangent plane is +.>Fig. 3 is a schematic diagram, in which three-dimensional distances and angles are considered in the actual shooting process.
The color impact conversion coefficient is related to the extent to which the color of the curved LED screen is affected by the brightness variation.
Viewing angle influence functionIs usually designed according to practical situations. For example, a change rule of the viewing angle influence may be described using a form of a gaussian function, a polynomial function, or the like.
Specifically, in the step S4, the central control processor performs a smoothness detection strategy on the secondarily corrected curved LED screen to determine a smoothness level;
and the smoothness detection strategy is to shoot a smoothness test image of the bent LED screen after the secondary correction at a standard position by using a depth camera, calculate the standard deviation of brightness of a plurality of light points of a single row and a single column in the smoothness test image, calculate the average value of the standard deviation of brightness of all the rows and columns and record the average value as the smoothness of the bent LED screen.
Specifically, in the step S4, if the smoothness is a preset smoothness level, the central control processor controls the correction module to perform smoothness correction on the curved LED screen;
wherein the smoothness correction is to reduce the luminance of the light points in the single row or the single column having a luminance higher than the standard luminance and a luminance difference of more than 10% to the average luminance of the light points in the single row or the single column;
the preset smoothness level satisfies that smoothness is greater than a smoothness threshold, the smoothness threshold is positively correlated with the total amount of light points contained by the LED screen, and a person skilled in the art can obtain the LED screen according to specific use scene requirements by combining limited test data.
The LED screen after secondary correction possibly has the conditions of low smoothness after correction and poor appearance although the brightness is balanced, the problem is avoided through smoothness correction, the display effect and the appearance are improved, and the correction precision is further improved.
Specifically, in the step S5, the central control processor calculates a brightness fine adjustment amount according to the attenuation index and the view angle influence characteristic value, and controls the correction module to increase brightness of all the light points by the brightness fine adjustment amount;
wherein the brightness fine adjustment is positively correlated with the decay index and negatively correlated with the viewing angle influence characteristic value. The attenuation index is the attenuation degree of the brightness of the bent LED screen along with the service time, and the service time is positively related to the attenuation index.
It is understood that the decay index is determined based on the LED application scenario and standard use time.
Optionally, the decay index J = length of use x standard luminance x corrosion resistance characteristic value of the material x conversion coefficient.
According to the invention, the central control processor calculates the brightness fine adjustment quantity according to the attenuation index and the view angle influence characteristic value, and controls the correction module to increase the brightness of all the lamp points by the brightness fine adjustment quantity, when the service time of the LED screen reaches a certain length, the brightness is attenuated along with the service time, and the brightness fine adjustment quantity is calculated by the attenuation index and the view angle influence characteristic value, so that the brightness attenuation can be neutralized on the premise of not influencing the look and feel, the service life of the LED screen is prolonged, and the correction precision is further improved.
Referring to fig. 2, a block diagram of a computer device according to an embodiment of the invention includes:
the depth camera is a structured light depth camera and is used for shooting a plurality of test images of the bent LED screen.
The central control processor is an embedded processor and is used for judging the correction mode of the correction module according to the test image shot by the depth camera;
the correction module is used for carrying out primary correction, secondary correction and smoothness correction on each module of the LED screen according to the correction mode determined by the central control processor;
the primary correction is to correct the brightness of all the color development modules of the LED screen to the standard brightness;
the secondary correction is to judge that a plurality of visual angles influence the lamp points according to the brightness difference of the lamp points in the standard position and the minimum visual angle position test image, calculate the correction amount of the brightness of the lamp points according to the visual angle influence function, and control the correction module to correct the bent LED screen according to the correction amount;
the smoothness correction is to reduce the luminance of the light points in the single row or the single column having a luminance higher than the standard luminance and a luminance difference of more than 10% to the average luminance of the light points in the single row or the single column.
The invention also provides a readable storage medium for the consistency correction of the LED screen module, which is a DRAM and is used for storing test images, view angle influence characteristic values, correction information and attenuation index data for the operation and control of a central control processor and for executing the reading and/or storage operation in the consistency correction method of the LED screen module.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The LED screen module consistency correction method is characterized by comprising the following steps of:
step S1, correcting the bent LED screen for one time by using a correction module so that the brightness of all modules is the same, and respectively obtaining test images of the bent LED screen subjected to the one-time correction at a standard position and a minimum visual angle position under standard brightness by using a depth camera;
step S2, the central control processor respectively establishes brightness change functions of the standard position and the minimum view angle position test image according to the test image, calculates view angle influence characteristic values according to the two brightness change functions, and judges view angle influence level according to the view angle influence characteristic values;
step S3, if the effect level is the preset effect level, the central control processor executes a visual angle effect correction strategy to control a correction module to carry out secondary correction on the bent LED screen;
step S4, the central control processor detects the smoothness of the bent LED screen subjected to the secondary correction, and controls the correction module to carry out smoothness correction on the bent LED screen when the smoothness is at a preset smoothness level;
step S5, the central control processor executes an attenuation compensation strategy on the curved LED screen after the smoothness correction;
the primary correction is to correct the brightness of all the color development modules of the bent LED screen to be standard brightness, the secondary correction is to determine a plurality of view angles to influence the lamp points according to the brightness difference of the test images of the lamp points at the standard position and the minimum view angle position so as to calculate correction amounts for the brightness of the corresponding lamp points, and the correction modules are controlled to correct the bent LED screen according to the correction amounts; the standard position is a position which meets the minimum shooting distance and is right to the curved LED screen, the minimum view angle position meets the minimum shooting distance and is positioned at the limit view angle, and the attenuation compensation strategy is to finely adjust the brightness of the curved LED screen by combining an attenuation index;
the preset influence level meets the condition that the visual angle influence characteristic value is larger than the standard influence value;
the shooting distance is the distance between a depth camera and the geometric center of the curved LED screen, and the limit view angle and the attenuation index are related to the original data of the curved LED screen;
the preset smoothness level meets the condition that smoothness is larger than a smoothness threshold, and the smoothness threshold is positively correlated with the total amount of the light points contained in the LED screen;
in the step S2, the standard position test image has a brightness change functionFor the mapping relation between the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the standard position, the brightness change function of the minimum view angle position>The mapping relation between the distance between the depth camera and the lamp point and the brightness of the lamp point in the test image shot at the minimum view angle position is obtained;
in the step S2, a viewing angle influence characteristic value K is calculated by formula (1);
（1）
wherein ,for the first conversion factor, +.>For the second conversion factor, +.>＞/>＞0，/>For the minimum viewing angle position and the minimum distance between the light points, < >>Is the maximum distance between the standard position and the lamp point, < >>Representation->Slope function of>Representation->Is a slope function of (a).
2. The method for correcting the consistency of the LED screen module according to claim 1, wherein the central control processor determines the influence level of the view angle on the brightness of the curved LED screen according to the view angle influence characteristic value, and if the influence level is a preset influence level, the central control processor executes the view angle influence correction strategy;
the visual angle influence correction strategy is to judge a plurality of visual angle influence lamp points according to the brightness difference of the lamp points in the standard position and the minimum visual angle position test image, and calculate the correction amount of the brightness of the lamp points according to the visual angle influence function;
the brightness difference of the test image of the visual angle influence lamp point at the standard position and the minimum visual angle position is larger than the standard brightness difference, and the standard brightness difference is positively correlated with the visual angle influence characteristic value.
3. The LED screen module uniformity correction method according to claim 2, wherein a correction amount for an i-th viewing angle-dependent lamp point is calculated from the viewing angle-dependent function，/>Determined by (2)；
（2）
wherein ,for the viewing angle influence function value corresponding to the distance between the ith viewing angle influence lamp point and the standard position,for the angle between the connection line of the ith visual angle influence lamp point and the standard position and the tangent plane of the ith visual angle influence lamp point, +.>For the included angle between the connection line of the ith visual angle influence lamp point and the minimum visual angle position and the tangent plane of the ith visual angle influence lamp point, M is the color influence conversion coefficient, and the visual angle influence function is->。
4. The LED screen module uniformity correction method according to claim 3, wherein in said step S4, said central control processor performs a smoothness detection strategy on said secondarily corrected curved LED screen to determine a smoothness level;
and the smoothness detection strategy is to shoot a smoothness test image of the bent LED screen after the secondary correction at a standard position by using a depth camera, calculate the standard deviation of brightness of a plurality of light points of a single row and a single column in the smoothness test image, calculate the average value of the standard deviation of brightness of all the rows and columns and record the average value as the smoothness of the bent LED screen.
5. The method according to claim 4, wherein in the step S4, if the smoothness is a preset smoothness level, the central control processor controls the correction module to perform smoothness correction on the curved LED screen;
wherein the smoothness correction is to reduce the luminance of the light points in the single row or the single column having a luminance higher than the standard luminance and a luminance difference of more than 10% to the average luminance of the light points in the single row or the single column.
6. The method according to claim 5, wherein in step S5, the central control processor calculates a brightness fine adjustment amount according to the attenuation index and the view angle influence characteristic value, and controls the correction module to increase brightness of all the light points by the brightness fine adjustment amount;
wherein the brightness fine adjustment is positively correlated with the decay index and negatively correlated with the viewing angle influence characteristic value;
the attenuation index is the attenuation degree of the brightness of the bent LED screen along with the service time, and the service time is positively related to the attenuation index.
7. A computer device applying the LED screen module uniformity correction method of any one of claims 1-6, said computer device comprising:
the depth camera is used for shooting a plurality of test images of the bent LED screen;
the central control processor adopts an embedded processor and is used for judging the correction mode of the correction module according to the test image shot by the depth camera;
the correction module adopts a digital signal processor and is used for carrying out primary correction, secondary correction and smoothness correction on each module of the LED screen according to the correction mode determined by the central control processor;
the primary correction is to correct the brightness of all the color development modules of the LED screen to the standard brightness;
the secondary correction is to judge that a plurality of visual angles influence the lamp points according to the brightness difference of the test images of the lamp points at the standard position and the minimum visual angle position, calculate the correction amount of the brightness of the lamp points according to the visual angle influence function, and control the correction module to correct the bent LED screen according to the correction amount;
the smoothness correction is to reduce the brightness of the light points in a single row or a single column having a brightness higher than the standard brightness and a brightness difference of more than 10% to the average brightness of the light points in a single row or a single column.
8. A readable storage medium for applying the LED screen module uniformity correction method according to any one of claims 1 to 6, wherein the readable storage medium is a DRAM for storing test images, viewing angle effect characteristic values, correction information, attenuation index data for operation and control by a central control processor, and for performing the reading and/or storing operations in the LED screen module uniformity correction method according to any one of claims 1 to 6.
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