CN112071257A - LED screen correction method and device, storage medium and LED screen - Google Patents
LED screen correction method and device, storage medium and LED screen Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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Abstract
The invention discloses an LED screen correction method, wherein an LED screen comprises a plurality of module arrays, each module comprises a plurality of LED lamp arrays, the correction method comprises the steps of sending a display instruction to the LED screen to enable the LED screen to display a designated image, then determining a module to be adjusted and a target module according to the designated image, then calculating a new color gamut of the module to be adjusted according to the tricolor images of the module to be adjusted and the target module and the original color gamut of the module to be adjusted, and finally adjusting the display of the module to be adjusted in the LED screen according to the new color gamut of the module to be adjusted, so that the display chromatic aberration of the module to be adjusted and the display chromatic aberration of the target module meet the system requirements, the correction of the LED screen is realized, and the problems of high equipment cost, high operation difficulty and the like when professional equipment is needed to correct the LED screen in the prior art are solved. The invention also provides an LED screen correction device, a storage medium and an LED screen.
Description
Technical Field
The invention relates to the field of LED screens, in particular to a method and a device for correcting an LED screen and a storage medium.
Background
An LED screen is generally composed of a plurality of LED modules, each of which includes a plurality of LED lamps arranged in an array. In the long-term use process of the LED screen, due to hardware loss, some LED modules on different LED screens have poor or no display effect, and a new LED module is generally used to replace an old LED module. However, the new LED module after replacement has a display difference from the old LED module originally existing on the LED screen, which affects the final display effect of the LED screen.
In the prior art, a colorimeter is generally used for measuring the chromaticity of each LED module in an LED screen, professional software is used for calculating the chromaticity value of each LED module and generating a chromaticity file, and the chromaticity file is sent to the LED screen to adjust the display effect of each LED module in the LED screen. Because the LED screen is generally located outdoors, a user needs to measure the chromaticity of the LED screen by means of a colorimeter and the like, and professional chromaticity calculation software is also needed to calculate the chromaticity value, so that the user is difficult to visually and quickly find the LED screen; meanwhile, the cost of the colorimeter is high, and only some LED screen manufacturers can purchase the device, so that the device is difficult to apply to common users.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a method for correcting an LED panel, which can solve the problems of high cost of display correction of the LED panel in the prior art.
The second objective of the present invention is to provide a LED panel calibration apparatus, which can solve the problem of high cost of LED panel display calibration in the prior art.
The invention further aims to provide a storage medium which can solve the problems that the display correction cost of an LED screen is high in the prior art and the like.
The fourth purpose of the present invention is to provide an LED screen, which can solve the problems of high cost of display correction for the LED screen in the prior art.
One of the purposes of the invention is realized by adopting the following technical scheme:
an LED screen correction method, wherein an LED screen comprises a plurality of module arrays, each module comprises a plurality of LED lamp arrays, and the LED screen correction method comprises the following steps:
module address acquisition: sending an instruction of displaying a module address to a control board of the LED screen, so that each module on the LED screen displays a corresponding appointed image according to the instruction of the display module address;
module address identification: shooting an image displayed on the LED screen through the mobile equipment, and identifying the image displayed on the LED screen to obtain a designated image of each module so as to obtain module address information of each module;
a shooting step: determining a module to be regulated and a target module according to the module address information of each module, and respectively shooting three primary color images of the LED screen through mobile equipment; the three primary color images comprise full red images, full green images and full blue images;
an identification step: obtaining a three-primary-color image of the module to be adjusted from the three-primary-color image of the LED screen according to the module address information of the module to be adjusted, and obtaining a three-primary-color image of the target module from the three-primary-color image of the LED screen according to the module address information of the target module; the three primary color images of the module to be adjusted comprise full red images of the module to be adjusted, full green images of the module to be adjusted and full blue images of the module to be adjusted; the three primary color image of the target module comprises a full red image of the target module, a full green image of the target module and a full blue image of the target module;
and (3) correcting: calculating a color gamut adjusting correction coefficient K according to the three primary color images of the module to be adjusted, the three primary color images of the target module and the CIE Yxy color model;
a color gamut calculation step: obtaining a new color gamut of the module to be adjusted according to the original color gamut of the module to be adjusted and the color gamut adjusting correction coefficient K; wherein A is1＝Aorg*K，A1For a new color gamut of the module to be adjusted, AorgThe original color gamut of the module to be adjusted;
and (3) adjusting: new color gamut A according to the module to be adjusted1And sending an adjusting instruction to a control panel of the LED screen in sequence, so that the brightness of the module to be adjusted on the LED screen is reduced in sequence until the color difference between the color display of the module to be adjusted and the color display of the target module meets the system requirement.
Further, the correcting step includes:
RGB mean value calculation step: calculating the three primary color images of the module to be regulated and the three primary color images of the target module to obtain the RGB mean value of each image;
calculating tristimulus values XYZ: calculating a tristimulus value XYZ of the CIE spectrum of each image according to the RGB mean value of each image;
a first matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the target module into a matrix C of CIE Yxy color modules0(ii) a Wherein the content of the first and second substances,
wherein, the matrix C0The first row of (A) represents the Yxy value of the full red image of the target module, matrix C0The second row of (a) represents the Yxy value of the all-green image of the target module, matrix C0The third row of (a) represents the Yxy value of the full blue image of the target module;
a second matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the module to be adjusted into a matrix C of a CIE Yxy color model1Performing the following steps; wherein the content of the first and second substances,
wherein, the matrix C1The first row of (A) represents the Yxy value of the full red image of the module to be conditioned, matrix C1The second row of (a) represents the Yxy value of the all-green image of the module to be conditioned, matrix C1The third row of (a) represents the Yxy value of the full blue image of the module to be adjusted;
and a correction coefficient calculation step: according to matrix C0And matrix C1Calculating a color gamut adjusting and correcting coefficient K; wherein K is C1 -1*C0。
Further, the display instruction comprises a control panel address, the control panel address comprises a port value and an address value, and the port value and the address value are represented by hexadecimal; the 2-bit port value and the 1-bit address value of the control board address both represent the unique identifier of one module on the LED screen; the designated image includes the hexadecimal number displayed by each module and the rectangular box corresponding to the module boundary.
Further, the identifying step includes: a pretreatment step: preprocessing the shot appointed image to obtain the outline area of each module; the outline area of each module is determined according to the rectangular frame of the module boundary of each module;
an identification step: and cutting out hexadecimal digits in the image of the corresponding module according to the outline area of each module and performing character recognition, thereby obtaining the module address information of each module by splicing.
Further, the preprocessing comprises image binarization, noise reduction, corrosion, expansion and contour searching; the outline searching means that a rectangular frame of each module is searched from a specified image, and the rectangular frame of each module meets two conditions: (1) the area of the rectangular frame is larger than a specified value; (2) a parent rectangle must exist in the rectangular frame, and the area of the parent rectangle is 2 times larger than that of the rectangular frame; the parent rectangle refers to a rectangular frame having an inclusion relationship with the rectangular frame.
Further, the mobile device is based on an android system.
Further, the adjusting step comprises sending an adjusting instruction to the LED screen according to the new color gamut of the module to be adjusted and the increment of the preset brightness value.
The second purpose of the invention is realized by adopting the following technical scheme:
the LED screen correction device comprises a memory and a processor, wherein an LED screen correction program capable of running on the processor is stored in the memory, the LED screen correction program is a computer program, and the steps of the LED screen correction method adopted by one of the purposes of the invention are realized when the processor executes the LED screen correction program.
The third purpose of the invention is realized by adopting the following technical scheme:
a storage medium which is a computer-readable storage medium having stored thereon an LED screen correction program which is a computer program which, when executed by a processor, implements the steps of an LED screen correction method as employed in one of the objects of the present invention.
The fourth purpose of the invention is realized by adopting the following technical scheme:
the LED screen is corrected by the LED screen correction method adopted according to one of the purposes of the invention.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the display image of the LED screen is shot by adopting the mobile equipment, and the module to be regulated and the target module in the LED screen are obtained by combining an image recognition technology, so that the new color gamut of the module to be regulated is obtained by calculating according to the display colors of the module to be regulated and the target module, the display regulation of the module to be regulated is realized, the module to be regulated is consistent with the target module, the problem of inconsistent display effect of the LED screen caused by the new module and the old module in the LED screen is solved, the correction of the LED screen is realized, meanwhile, the cost for correcting the LED screen is greatly reduced due to the realization of the mobile equipment, and the LED screen correction system has the characteristics of simple operation, suitability for common users and the like.
Drawings
FIG. 1 is a front view of the positional relationship between a mobile device and an LED screen provided by the present invention;
FIG. 2 is a schematic diagram of a module displaying a designated image on an LED screen according to the present invention;
FIG. 3 is a flowchart of a method for calibrating an LED panel according to the present invention;
fig. 4 is a flowchart of step S2 in fig. 3;
fig. 5 is a flowchart of step S5 in fig. 3;
fig. 6 is a block diagram of a LED screen calibration apparatus according to the present invention.
In the figure: 11. a memory; 12. a processor; 13. a communication bus; 14. a network interface.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
The invention provides a method for correcting an LED (Light Emitting Diode) screen, which utilizes image recognition, can realize the display correction of the LED screen through mobile equipment, can greatly reduce the correction cost, and has the advantages of simple and flexible operation and wider application. Preferably, the LED screen of the present invention mainly refers to a VMS screen applied in the traffic field for displaying traffic signs, each LED screen includes a control board, and a plurality of module arrays installed on the control board, and each module is composed of a plurality of LED lamps. Each module is detachably arranged on the control panel, and the display of the LED lamp in each module is controlled through the control panel. That is to say, when a certain module on the LED screen is damaged and is not displayed, the old module can be directly replaced by the new module, and then the replacement of the LED screen can be realized. The invention also aims at adjusting the display of the new module and the old module to keep the display effect consistent when the display brightness of the new module and the old module is inconsistent after the new module is replaced.
Preferably, as shown in fig. 1-5, the present invention provides a preferred embodiment, the calibration method comprising the steps of:
and step S1, sending an instruction for displaying module addresses to the LED screen, so that each module in the LED screen displays a corresponding specified image. Generally, a remote controller of the LED screen can send an instruction for displaying an address of a module to a control board of the LED screen, so that each module in the LED screen displays a corresponding designated image. Or, a corresponding LED screen control soft APP (Application) is installed on the mobile device, and an instruction for displaying a module address is sent to a control board of the LED screen by operating the LED screen control software APP, so that each module in the LED screen displays a corresponding designated image.
Preferably, the method and the device can determine the module address information of each module on the LED screen according to the designated image displayed by each module by controlling each module in the LED screen to display the corresponding designated image, namely identifying the module address information of the module to be adjusted and the target module. The module to be adjusted and the target module refer to modules on the LED screen. The target module is a calibration module, and the module to be adjusted is a module to be calibrated. The brightness of the module to be adjusted is adjusted to be consistent with the target module, namely the display effect of the module to be adjusted is consistent with the display effect of the target module.
Preferably, each module corresponds to a given image. The display content of each designated image includes a three-digit hexadecimal number and a rectangular frame surrounding the corresponding module. Because the LED screen is composed of a plurality of module arrays, and the display of the LED screen is controlled by the control panel.
The instruction of the display module comprises a control panel address, wherein the control panel address comprises a hexadecimal number, the number represents a port of a control panel, and the port is an LDU port.
Since the display of modules on the LED screen is controlled by the control board, each module has a unique identifier on the control board on the LED screen. The module address information of each module includes a port value of the control board and a port at which the control board is connected to the module. The maximum module address information of each module is two-digit hexadecimal number, and different modules on the LED screen are distinguished through the module address information. And the corresponding module on the LED screen displays the designated image by sending an instruction of displaying the module address to the control panel. For example, when the display module address is sent to the control board of the LED screen, the first module in the upper left corner of the LED screen will display 100 and the rectangular frame bounding the first module, as shown in fig. 2.
And step S2, shooting the appointed image of the LED screen through the mobile device, and identifying the module address information of each module on the LED screen according to the appointed image.
Since, the module address information is an identifier of each module. The module address information of each module can be identified through the designated image, and then the module to be adjusted and the target module can be determined. One or more modules to be adjusted can be provided.
Preferably, the mobile device in the invention is a mobile device based on an android system. For example, a mobile phone, tablet, etc. with the android system installed.
When the mobile device shoots the LED screen, the mobile device is opposite to the LED screen, and the mobile device and the LED screen are kept parallel, as shown in figure 1.
Generally, when an LED screen is photographed by a mobile device, scan lines, moire fringes, and the like are easily generated. In order to guarantee the shooting definition, when the mobile device shoots the LED screen, scanning lines are eliminated by adjusting the exposure, the brightness and the like of a camera of the mobile device, and therefore a clearer image is shot. The invention can realize the display correction of the LED screen through mobile equipment, such as mobile phones and other equipment, can greatly reduce the correction cost, has flexible operation, is suitable for general users, and solves the problems of high operation difficulty, high cost and the like in the prior art that the correction of the LED screen can be carried out only by professional equipment.
Preferably, in order to identify the module to be adjusted and the target module, as shown in fig. 4, step S2 further includes:
step S21, deriving a contour region for each module by preprocessing the captured designated image. The preprocessing comprises image binarization, noise reduction, corrosion, expansion, contour searching and the like.
In general, the contour search finds a rectangular frame of a module in a specific image. The rectangular frame needs to satisfy the following conditions:
(1) the area of the rectangular box is larger than a specified value.
(2) A parent rectangle must exist for a rectangular frame, and the area of the parent rectangle is greater than 2 times the area of the rectangular frame. The parent rectangle refers to a rectangular frame having an inclusion relationship with the rectangular frame.
And step S22, obtaining the hexadecimal number displayed by each module in the appointed image according to the outline area of each module, and performing character recognition, thereby obtaining the module address information of each module by splicing.
After the module address information of each module is determined, the module to be adjusted and the target module need to be determined. Preferably, the method further comprises:
and step S3, determining a module to be regulated and a target module, and shooting three primary color images on the LED screen in sequence through the mobile equipment. The three primary color images comprise three images, namely a full red image, a full green image and a full blue image. During correction, only one module to be adjusted and one target module can be selected for correction at a time.
Step S4, deriving a three primary color image of the module to be adjusted from the three primary color image of the LED panel according to the module address information of the module to be adjusted, and deriving a three primary color image of the target module from the three primary color image of the LED panel according to the module address information of the target module. The three primary color images of the module to be adjusted and the three primary color images of the target module are three, and are respectively corresponding full red images, full green images and full blue images.
That is, the full red image, the full green image, and the full red image of the module to be adjusted are recognized from the full red image, the full green image, and the full blue image of the LED screen, respectively.
And respectively identifying the full red image, the full green image and the full red image of the target module from the full red image, the full green image and the full blue image of the LED screen.
According to the invention, when the adjusting module is used for displaying, the adjusting module is adjusted aiming at a single module, so that in order to avoid the influence on other modules on the subsequent image processing result, the three primary color images of the module to be adjusted and the target module are cut out from the three primary color images of the LED screen.
And step S5, calculating a color gamut adjusting correction coefficient K according to the three primary color images of the module to be adjusted, the three primary color images of the target module and the CIE Yxy color model.
Because the display brightness of the module to be adjusted and the display brightness of the target module have color difference, the correction coefficient of the color gamut adjustment of the module to be adjusted is calculated according to the three primary color images of the module to be adjusted and the three primary color images of the target module.
Preferably, as shown in fig. 5, the step S5 includes:
and step S51, calculating the three primary color images of the module to be adjusted and the three primary color images of the target module respectively to obtain RGB (colors of three channels of red, green and blue, the values of which are all 0-255) mean values of each image, and calculating a tristimulus value XYZ of CIE (International Commission on illumination) spectrum of each image according to the RGB mean values of each image.
Generally, the CIE color model is a model defined by the international commission on illumination, and the CIE Yxy color model is one of the CIE color models.
In addition, the RGB model and the CIE color module can be converted to each other.
Therefore, the tristimulus values XYZ of the CIE spectrum of each image can be calculated from the RGB mean value of each image. Wherein X is the stimulus amount of the red primary color, Y is the stimulus amount of the green primary color, and Z is the stimulus amount of the blue primary color.
The Yxy value is obtained by converting an RGB coordinate system into an XYZ coordinate system and then converting the XYZ coordinate system into an Yxy coordinate system, and is one of tristimulus values. This conversion process is well known to those skilled in the art and the present invention is not specifically described.
Step S52, correspondingly substituting Yxy values in the tristimulus values XYZ of each three primary color image of the target module into a matrix C of a CIE Yxy color model0In (1). Wherein the content of the first and second substances,
wherein the matrix C0The first row of (A) represents the Yxy value of the full red image of the target module, matrix C0The second row represents the Yxy value of the all-green image of the target module, matrix C0The third row represents the Yxy value of the full blue image of the target module.
That is, matrix C0In (1): redY, redx, redY respectively represent the Y value, x value, Y value of the full red image of the target module; greenY, greenx and greenY respectively represent a Y value, an x value and a Y value of the all-green image of the target module; blue Y, blue x, blue respectively represent the Y, x, Y values of the full blue image of the target module.
Step S53, correspondingly substituting Yxy values in the tristimulus values XYZ of each three-primary-color image of the module to be adjusted into a matrix C of a CIE Yxy color model1In (1). Wherein the content of the first and second substances,
whereinThe matrix C1The first row of (A) represents the Yxy value of the full red image of the module to be conditioned, matrix C1The second row represents the Yxy value of the all-green image of the module to be conditioned, matrix C1The third row represents the Yxy value of the full blue image of the module to be adjusted.
For the same reason, matrix C1In (1): redY, redx and redY respectively represent a Y value, an x value and a Y value of the full red image of the module to be regulated; greenY, greenx and greenY respectively represent a Y value, an x value and a Y value of the all-green image of the module to be regulated; blue Y, blue x, blue respectively represent the Y value, x value, Y value of the full blue image of the module to be adjusted.
Step S54, according to the matrix C0And matrix C1And calculating a color gamut adjusting correction coefficient K. Wherein K is C1 -1*C0。
Step S55, according to the original color gamut A of the module to be adjustedorgAnd obtaining a new color gamut A of the module to be adjusted by the color gamut adjusting correction coefficient K1. Wherein A is1＝AorgK. Wherein A is1For a new color gamut of the module to be adjusted, AorgIs the original color gamut of the module to be adjusted. Wherein the original color gamut of the module to be adjusted is available from a factory configuration of the LED module.
Step S6, according to the new color gamut A of the module to be adjusted1And sending an adjusting instruction to a control panel of the LED screen in sequence, so that the brightness of the module to be adjusted on the LED screen is reduced in sequence until the color display of the module to be adjusted and the color display of the target module meet the system requirement.
Preferably, the adjustment instructions are sequentially sent to the control panel of the ELD screen according to the new color gamut of the module to be adjusted and the increment and decrement of the preset brightness value, so that the brightness of the module to be adjusted of the LED screen is sequentially reduced.
In an actual application process, in order to ensure that the brightness of the module to be adjusted does not have a large error, an adjustment instruction is generally sent to a control board of the LED screen in a 500 brightness increment amount, so that the brightness of the module to be adjusted on the LED screen is gradually reduced until the color display of the strip module to be adjusted and the color display of the target module reach a certain range.
Example two
The invention provides a correction device for an LED screen. As shown in fig. 6, an internal structure of the LED screen calibration apparatus according to an embodiment of the present invention is schematically illustrated.
In this embodiment, the LED screen correction device may be a PC (Personal Computer), or may be a terminal device such as a smart phone, a tablet Computer, or a portable Computer. This LED screen correcting unit includes at least: a processor 12, a communication bus 13, a network interface 14, and a memory 11.
The memory 11 includes at least one type of readable storage medium, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the LED screen correction device, e.g. a hard disk of the LED screen correction device. The memory 11 may also be an external storage device of the LED screen calibration apparatus in other embodiments, such as a plug-in hard disk provided on the LED screen calibration apparatus, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 11 may also include both an internal storage unit of the LED screen correction apparatus and an external storage device. The memory 11 may be used not only to store application software installed in the LED panel correction apparatus and various types of data, such as codes of LED panel correction programs, etc., but also to temporarily store data that has been output or will be output.
The processor 12 may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor or other data Processing chip in some embodiments, and is used for executing program codes stored in the memory 11 or Processing data, such as executing an LED screen calibration program.
The communication bus 13 is used to realize connection communication between these components.
The network interface 14 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), and is typically used to establish a communication link between the LED screen calibration apparatus and other electronic devices.
Optionally, the LED screen correction apparatus may further include a user interface, the user interface may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface may further include a standard wired interface and a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, or the like. The display, which may also be referred to as a display screen or display unit, is suitable for displaying information processed in the LED screen correction device and for displaying a visual user interface.
Fig. 6 shows only the LED screen correction device with the components 11-14 and the LED screen correction program, and it will be understood by those skilled in the art that the structure shown in fig. 6 does not constitute a limitation of the LED screen correction device, and may include fewer or more components than those shown, or combine certain components, or a different arrangement of components.
In the embodiment of the LED panel calibration apparatus shown in fig. 6, the memory 11 stores an LED panel calibration program; when the processor 12 executes the LED screen correction program stored in the memory 11, the following steps are implemented:
module address acquisition: sending an instruction of displaying a module address to a control board of the LED screen, so that each module on the LED screen displays a corresponding appointed image according to the instruction of the display module address;
module address identification: shooting an image displayed on the LED screen through the mobile equipment, and identifying the image displayed on the LED screen to obtain a designated image of each module so as to obtain module address information of each module;
a shooting step: determining a module to be regulated and a target module according to the module address information of each module, and respectively shooting three primary color images of the LED screen through mobile equipment; the three primary color images comprise full red images, full green images and full blue images;
an identification step: obtaining a three-primary-color image of the module to be adjusted from the three-primary-color image of the LED screen according to the module address information of the module to be adjusted, and obtaining a three-primary-color image of the target module from the three-primary-color image of the LED screen according to the module address information of the target module; the three primary color images of the module to be adjusted comprise full red images of the module to be adjusted, full green images of the module to be adjusted and full blue images of the module to be adjusted; the three primary color image of the target module comprises a full red image of the target module, a full green image of the target module and a full blue image of the target module;
and (3) correcting: calculating a color gamut adjusting correction coefficient K according to the three primary color images of the module to be adjusted, the three primary color images of the target module and the CIE Yxy color model;
a color gamut calculation step: obtaining a new color gamut of the module to be adjusted according to the original color gamut of the module to be adjusted and the color gamut adjusting correction coefficient K; wherein A is1＝Aorg*K，A1For a new color gamut of the module to be adjusted, AorgThe original color gamut of the module to be adjusted;
and (3) adjusting: new color gamut A according to the module to be adjusted1And sending an adjusting instruction to a control panel of the LED screen in sequence, so that the brightness of the module to be adjusted on the LED screen is reduced in sequence until the color difference between the color display of the module to be adjusted and the color display of the target module meets the system requirement.
Further, the correcting step includes:
RGB mean value calculation step: calculating the three primary color images of the module to be regulated and the three primary color images of the target module to obtain the RGB mean value of each image;
calculating tristimulus values XYZ: calculating a tristimulus value XYZ of the CIE spectrum of each image according to the RGB mean value of each image;
a first matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the target module into a matrix C of CIE Yxy color modules0(ii) a Wherein the content of the first and second substances,
wherein, the matrix C0The first row of (A) represents the Yxy value of the full red image of the target module, matrix C0The second row of (2) represents a full green image of the target moduleYxy value, matrix C0The third row of (a) represents the Yxy value of the full blue image of the target module;
a second matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the module to be adjusted into a matrix C of a CIE Yxy color model1Performing the following steps; wherein the content of the first and second substances,
wherein, the matrix C1The first row of (A) represents the Yxy value of the full red image of the module to be conditioned, matrix C1The second row of (a) represents the Yxy value of the all-green image of the module to be conditioned, matrix C1The third row of (a) represents the Yxy value of the full blue image of the module to be adjusted;
and a correction coefficient calculation step: according to matrix C0And matrix C1Calculating a color gamut adjusting and correcting coefficient K; wherein K is C1 -1*C0。
Further, the display instruction comprises a control panel address, the control panel address comprises a port value and an address value, and the port value and the address value are represented by hexadecimal; the 2-bit port value and the 1-bit address value of the control board address both represent the unique identifier of one module on the LED screen; the designated image includes the hexadecimal number displayed by each module and the rectangular box corresponding to the module boundary.
Further, the identifying step includes: a pretreatment step: preprocessing the shot appointed image to obtain the outline area of each module; the outline area of each module is determined according to the rectangular frame of the module boundary of each module;
an identification step: and cutting out hexadecimal digits in the image of the corresponding module according to the outline area of each module and performing character recognition, thereby obtaining the module address information of each module by splicing.
Further, the preprocessing comprises image binarization, noise reduction, corrosion, expansion and contour searching; the outline searching means that a rectangular frame of each module is searched from a specified image, and the rectangular frame of each module meets two conditions: (1) the area of the rectangular frame is larger than a specified value; (2) a parent rectangle must exist in the rectangular frame, and the area of the parent rectangle is 2 times larger than that of the rectangular frame; the parent rectangle refers to a rectangular frame having an inclusion relationship with the rectangular frame.
Further, the mobile device is based on an android system.
Further, the adjusting step comprises sending an adjusting instruction to the LED screen according to the new color gamut of the module to be adjusted and the increment of the preset brightness value.
EXAMPLE III
A storage medium, which is a computer readable storage medium, on which an LED screen correction program is stored, wherein the LED screen correction program is a computer program, and when executed by a processor, the LED screen correction program implements the steps of an LED screen correction method according to an embodiment.
Example four
Based on the first embodiment, the invention provides the LED screen corrected by the LED screen correction method provided by the first embodiment.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. An LED screen correction method, wherein the LED screen comprises a plurality of module arrays, each module comprises a plurality of LED lamp arrays, and the LED screen correction method comprises the following steps:
module address acquisition: sending an instruction of displaying a module address to a control board of the LED screen, so that each module on the LED screen displays a corresponding appointed image according to the instruction of the display module address;
module address identification: shooting an image displayed on the LED screen through the mobile equipment, and identifying the image displayed on the LED screen to obtain a designated image of each module so as to obtain module address information of each module;
a shooting step: determining a module to be regulated and a target module according to the module address information of each module, and respectively shooting three primary color images of the LED screen through mobile equipment; the three primary color images comprise full red images, full green images and full blue images;
an identification step: obtaining a three-primary-color image of the module to be adjusted from the three-primary-color image of the LED screen according to the module address information of the module to be adjusted, and obtaining a three-primary-color image of the target module from the three-primary-color image of the LED screen according to the module address information of the target module; the three primary color images of the module to be adjusted comprise full red images of the module to be adjusted, full green images of the module to be adjusted and full blue images of the module to be adjusted; the three primary color image of the target module comprises a full red image of the target module, a full green image of the target module and a full blue image of the target module;
and (3) correcting: calculating a color gamut adjusting correction coefficient K according to the three primary color images of the module to be adjusted, the three primary color images of the target module and the CIE Yxy color model;
a color gamut calculation step: obtaining a new color gamut of the module to be adjusted according to the original color gamut of the module to be adjusted and the color gamut adjusting correction coefficient K; wherein A is1＝Aorg*K，A1For a new color gamut of the module to be adjusted, AorgThe original color gamut of the module to be adjusted;
and (3) adjusting: new color gamut A according to the module to be adjusted1And sending an adjusting instruction to a control panel of the LED screen in sequence, so that the brightness of the module to be adjusted on the LED screen is reduced in sequence until the color difference between the color display of the module to be adjusted and the color display of the target module meets the system requirement.
2. The LED screen correction method according to claim 1, characterized in that the correction step comprises:
RGB mean value calculation step: calculating the three primary color images of the module to be regulated and the three primary color images of the target module to obtain the RGB mean value of each image;
calculating tristimulus values XYZ: calculating a tristimulus value XYZ of the CIE spectrum of each image according to the RGB mean value of each image;
a first matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the target module into a matrix C of CIE Yxy color modules0(ii) a Wherein the content of the first and second substances,
wherein, the matrix C0The first row of (A) represents the Yxy value of the full red image of the target module, matrix C0The second row of (a) represents the Yxy value of the all-green image of the target module, matrix C0The third row of (a) represents the Yxy value of the full blue image of the target module;
a second matrix calculation step: substituting Yxy values in tristimulus values XYZ of each three-primary-color image of the module to be adjusted into a matrix C of a CIE Yxy color model1Performing the following steps; wherein the content of the first and second substances,
wherein, the matrix C1The first row of (A) represents the Yxy value of the full red image of the module to be conditioned, matrix C1The second row of (a) represents the Yxy value of the all-green image of the module to be conditioned, matrix C1The third row of (a) represents the Yxy value of the full blue image of the module to be adjusted;
and a correction coefficient calculation step: according to matrix C0And matrix C1Calculating a color gamut adjusting and correcting coefficient K; wherein K is C1 -1*C0。
3. The LED screen correction method according to claim 1, wherein the display instruction comprises a control board address, the control board address comprises a port value and an address value, and the port value and the address value are represented in hexadecimal; the 2-bit port value and the 1-bit address value of the control board address both represent the unique identifier of one module on the LED screen; the designated image includes the hexadecimal number displayed by each module and the rectangular box corresponding to the module boundary.
4. The LED screen correction method according to claim 3, characterized in that the identification step comprises: a pretreatment step: preprocessing the shot appointed image to obtain the outline area of each module; the outline area of each module is determined according to the rectangular frame of the module boundary of each module;
an identification step: and cutting out hexadecimal digits in the image of the corresponding module according to the outline area of each module and performing character recognition, thereby obtaining the module address information of each module by splicing.
5. The LED screen correction method according to claim 4, characterized in that the preprocessing comprises image binarization, noise reduction, corrosion, expansion and contour search; the outline searching means that a rectangular frame of each module is searched from a specified image, and the rectangular frame of each module meets two conditions: (1) the area of the rectangular frame is larger than a specified value; (2) a parent rectangle must exist in the rectangular frame, and the area of the parent rectangle is 2 times larger than that of the rectangular frame; the parent rectangle refers to a rectangular frame having an inclusion relationship with the rectangular frame.
6. The LED screen correction method according to claim 1, wherein the mobile device is an android-based mobile device.
7. The LED screen correction method according to claim 1, wherein the adjusting step comprises sending an adjusting instruction to the LED screen according to the new color gamut of the module to be adjusted and the preset brightness value increment.
8. An LED screen correction device comprises a memory and a processor, wherein an LED screen correction program which can run on the processor is stored in the memory, and the LED screen correction program is a computer program, and is characterized in that: the steps of a LED screen correction method as claimed in any one of claims 1-7 are implemented when the processor executes the LED screen correction program.
9. A storage medium which is a computer-readable storage medium having an LED screen correction program stored thereon, the LED screen correction program being a computer program characterized in that: the steps of an LED screen correction method as claimed in any one of claims 1 to 7 are implemented by the LED screen correction program when executed by the processor.
10. An LED screen, characterized in that the LED screen is corrected by the LED screen correction method according to any one of claims 1-7.
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