CN115188316A - System, device and method for correcting bright and dark lines of LED display screen by unmanned aerial vehicle - Google Patents
System, device and method for correcting bright and dark lines of LED display screen by unmanned aerial vehicle Download PDFInfo
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Abstract
The invention relates to a system, a device and a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle, wherein the method comprises the steps of selecting a hovering position; determining the longitudinal relative position of the unmanned aerial vehicle and the ground; planning a flight route of the unmanned aerial vehicle; determining the starting point position of the flight path of the unmanned aerial vehicle by an OCR recognition visual perception unit; sequentially identifying the digital label of each module of the LED display screen; sequentially photographing the modules one by one to form a photographing path, and transmitting module high-definition images obtained by sequentially photographing to a display screen control subsystem in real time by an unmanned aerial vehicle; and outputting corresponding bright and dark line correction coefficients for the high-definition images corresponding to each module, and directly feeding the bright and dark line correction coefficients back to the bright and dark line correction unit of the display screen to realize bright and dark line correction of each module. The method has the advantages that massive calculation of the later correction coefficient can be facilitated, and the LED display screen correction efficiency and accuracy are improved.
Description
Technical Field
The invention relates to the field of LED display screen correction, in particular to a system, a device and a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle.
Background
With the popularization of LED display screens in various fields, all-in-one conference machines from small to indoor, outdoor scene walls of tall buildings and large to outdoor, and application in traffic hubs such as airports, subways and the like, the LED display screens are completely integrated into the living aspects of people, and good visual experience can be brought to people.
Holistic LED display screen is formed by the concatenation of each little module, often can appear the problem of bright line and dark line on the LED display screen because factors such as the structure difference of every module and installation master's gimmick custom, causes the reason of bright line: the splicing between modules is too compact; the reasons for the dark lines are: the gap of splicing between the modules is too large. The generation of the bright lines and the dark lines can greatly affect the overall display effect of the LED display screen, namely, the overall picture is locally separated, and the aesthetic feeling of the picture can be really completed.
For the problem of correcting bright and dark lines, a common solution is to debug the bright lines or the dark lines of each box body based on the visual experience of technicians in a darkroom, then splice the debugged box bodies into a complete display screen, and debug the bright and dark lines between the box bodies, and the traditional debugging mode is time-consuming and labor-consuming. A more intelligent and applicable debugging method is needed, which can effectively eliminate the problems of bright lines and dark lines by directly debugging a complete display screen at one time.
To problem and the limitation that traditional bright dark line debugging exists, this patent is based on OCR recognition algorithm, transplants it to unmanned aerial vehicle's visual perception system, can plan the flight route according to our own demand and shoot every module, directly handles the photo and acquires the bright dark line correction coefficient that every module corresponds, then feeds back the correction coefficient to every module that corresponds, can realize the bright dark line correction of whole screen of one time. The existing traditional debugging technology debugs bright and dark lines of each box body and then the bright and dark lines of the whole display screen, is time-consuming and labor-consuming, and is debugged completely by means of visual experience of technicians, and the precision and the stability of the bright and dark line debugging are deficient.
Disclosure of Invention
Based on this, it is necessary to provide a system for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle, aiming at the problem that the existing unmanned aerial vehicle corrects the system for correcting bright and dark lines of the LED display screen.
The embodiment of the application provides an unmanned aerial vehicle system for correcting bright and dark lines of an LED display screen, which comprises an unmanned aerial vehicle control subsystem and a display screen control subsystem;
the unmanned aerial vehicle control subsystem includes: the OCR recognition visual perception unit, the route planning module and the module image acquisition and transmission unit; the unmanned aerial vehicle control subsystem is arranged in the unmanned aerial vehicle controller;
the display screen control subsystem includes: a display screen bright and dark line correction unit; the display screen control subsystem is arranged in the display screen controller;
the OCR recognition vision perception unit comprises a forward-looking vision detection module, a forward-looking vision OCR recognition module, a lower vision and ultrasonic sensor module and a distance measurement perception module;
the forward-looking vision detection module is used for detecting an LED display screen right in front of the unmanned aerial vehicle vision and selecting a horizontal fixed-point hovering position;
the lower vision and ultrasonic sensor module is used for determining the longitudinal relative position of the unmanned aerial vehicle and the ground;
the forward-looking vision OCR recognition module is used for determining the starting position of the flight path of the unmanned aerial vehicle through the OCR recognition vision perception unit and sequentially recognizing the label in the center of each module of the LED display screen;
the route planning module is used for planning a flight route of the unmanned aerial vehicle, setting a fixed horizontal line moving distance and a fixed longitudinal moving distance according to different types of LED display screens according to the starting point position of the flight route of the unmanned aerial vehicle as the original point of the unmanned aerial vehicle;
the module image acquisition and transmission unit is used for sequentially photographing the modules one by the module labels sequentially recognized by the front vision OCR recognition module according to the route planning and the photographing sequence to form a photographing path, and then transmitting the module high-definition images obtained by sequentially photographing to the display screen control subsystem by the unmanned aerial vehicle in real time;
the module image acquisition and transmission unit comprises an acquisition module; the acquisition module is used for acquiring the designated module images, wherein the acquisition field of vision of the camera on the unmanned aerial vehicle comprises the module images adjacent to four sides of the designated module, and the flight task of the acquired images is completed by combining the designated route planning and the OCR recognition technology;
the distance measurement sensing module for the unmanned aerial vehicle can acquire the minimum safe sensing distance between the unmanned aerial vehicle and the LED display screen;
and the display screen bright and dark line correction unit is used for outputting corresponding bright and dark line correction coefficients for the high-definition images corresponding to each module, and then directly feeding the bright and dark line correction coefficients back to the display screen bright and dark line correction unit to realize bright and dark line correction of each module.
The embodiment of the invention also provides a method for correcting bright and dark lines of the LED display screen by the unmanned aerial vehicle, which comprises the following steps:
detecting an LED display screen right in front of the vision of the unmanned aerial vehicle, and selecting a horizontal fixed-point hovering position;
determining the longitudinal relative position of the unmanned aerial vehicle and the ground;
planning a flight route of the unmanned aerial vehicle, setting a fixed transverse line moving distance and a fixed longitudinal moving distance according to different types of LED display screens by taking the starting point position of the flight route of the unmanned aerial vehicle as the original point of the flight of the unmanned aerial vehicle;
determining the starting point position of the flight path of the unmanned aerial vehicle by an OCR recognition visual perception unit; sequentially identifying a label in the center of each module of the LED display screen; according to route planning and a photographing sequence, sequentially photographing the modules one by the module labels sequentially recognized by the front vision OCR recognition module to form a photographing path, and transmitting module high-definition images obtained by sequentially photographing to the display screen control subsystem in real time by the unmanned aerial vehicle;
and outputting corresponding bright and dark line correction coefficients for the high-definition images corresponding to each module, and directly feeding the bright and dark line correction coefficients back to the bright and dark line correction unit of the display screen to realize bright and dark line correction of each module.
In some embodiments, the identifying by OCR the visual perception unit determines the starting position of the flight path of the unmanned aerial vehicle; the label of discerning every module positive center of LED display screen in proper order includes the step:
acquiring an image data set with labels of an LED display screen module, selecting the LED display screen to be in a test mode, and taking pictures of each module through a mobile phone, a camera or other shooting equipment, wherein the requirement of taking pictures needs to acquire label information of four edges of a single module and the center of the module;
acquiring image data sets with various characteristics by switching light point intervals and brightness values of light points; for example, the acquired image data set with diversified characteristics comprises 10000 images in total, and the label corresponding to each module has 10 different styles;
obtaining an OCR recognition model, and selecting an OCR text recognition model combination; for example, a CTPN + CRNN model combination with better OCR text recognition performance is selected;
training again to obtain a corresponding model;
and transplanting the OCR recognition model to an OCR recognition visual perception unit of the unmanned aerial vehicle.
In some embodiments, the step of planning a flight path of the drone includes:
determining the coordinates of the return position, and connecting the coordinates with an unmanned aerial vehicle handle through a mobile phone in a wired manner;
acquiring the coordinates of the starting point of a flight route, and enabling the unmanned aerial vehicle to quickly approach the LED display screen by selecting a normal flight mode on the handle;
and planning the flight path, and constructing a route model of the flight path.
In some embodiments, the step of outputting the corresponding bright and dark line correction coefficient for the high definition image corresponding to each module and then directly feeding back the bright and dark line correction coefficient to the display screen bright and dark line correction unit to realize bright and dark line correction of each module comprises the steps of;
calculating a correction coefficient of the bright and dark lines of each module;
compensating a feedback correction coefficient; specifically, according to the sequence of the module labels, when the current module picture is shot, the compensation coefficient of the last module is fed back to the LED display screen, and the process is circulated in sequence until the compensation of the correction coefficient of the last module is completed.
In some embodiments, the method further comprises:
acquiring the minimum safe sensing distance between the unmanned aerial vehicle and the LED display screen in real time;
and if the safety perception distance is smaller than a set value, giving an alarm, and automatically enabling the unmanned aerial vehicle to fly in parallel with the LED display screen by the minimum set value.
In some embodiments, the method further comprises the following step before detecting the LED display screen directly in front of the unmanned aerial vehicle vision:
setting splicing seams among the modules as central lines, and respectively selecting two rows of lamp beads on two sides of the central lines;
and setting the cross-shaped intersection between any four adjacent modules as a non-lighting lamp point.
In some embodiments, the module labels sequentially recognized by the front vision OCR recognition module sequentially take pictures of the modules one by one, and the step of forming the picture taking path includes:
the module of using the leftmost of the highest capable module of LED display screen is unmanned aerial vehicle flight initial point, prolongs in proper order the module of highest capable flies to the module of rightmost right, moves down the line again, follows the module of rightmost right flies to the module of leftmost left in proper order, later moves down the line again to above-mentioned step of repetition.
In some embodiments, the acquiring an image data set with a tag of an LED display screen module, selecting the LED display screen to a test mode, and taking a picture of each module through a mobile phone, a camera, or other shooting devices, where the requirement of taking a picture requires acquiring tag information of four edges of a single module and a center of the module, further includes:
when gathering appointed module image, the collection field of vision of camera on the unmanned aerial vehicle can include the module image adjacent with four limits of appointed module, combines appointed airline planning and OCR recognition technology, accomplishes the flight task of gathering the image.
In some embodiments, the common edge formed by connecting each module with other modules of the LED display screen only calculates the correction coefficient of the bright and dark lines of each module once.
The embodiment of the invention also provides a device for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle, which comprises the following components; the invention discloses a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle.
An embodiment of the present application further provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle according to any embodiment of the present application.
In the bright dark line system of unmanned aerial vehicle correction LED display screen that this application embodiment provided, when the LED display screen is in the state of test pattern mode, every module all has corresponding digital serial number, visual detection and positioning system based on OCR discernment and unmanned aerial vehicle self, can accurately confirm the initial point that unmanned aerial vehicle shot to the LED display screen according to the course planning, then set for fixed lateral shifting distance and longitudinal movement distance according to the product of different models and once only accomplish the whole display screen and shoot. Through the transplantation of an OCR recognition algorithm, intelligent recognition can be realized, the accurate hovering position is determined, photographing can be carried out according to the designated route planning path, and the photo corresponding to each module is obtained. The invention relates to a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle based on OCR recognition, which provides great convenience for acquiring images of a bright and dark line acquisition module of an outdoor LED display screen through intelligent shooting and recognition modes such as OCR recognition technology, fixed-point hovering of the unmanned aerial vehicle and the like, and reduces the risk of correcting the display screen at high altitude and the correction precision; the modules of the invention are independently decoupled, which is convenient for realizing further expansion and development of the single module by subsequent actual requirements.
Drawings
Fig. 1 is a schematic structural diagram of a system for correcting bright and dark lines of an LED display screen of an unmanned aerial vehicle according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of an OCR recognition visual perception unit according to an embodiment of the present application;
fig. 3 is a flowchart of a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle according to an embodiment of the present application;
FIG. 4 illustrates an embodiment of the present application, wherein the OCR-based visual perception unit determines the starting position of the flight path of the UAV; the method comprises the following steps of sequentially identifying a label in the center of each module of the LED display screen;
fig. 5 is a flowchart illustrating steps of planning a flight path of an unmanned aerial vehicle according to an embodiment of the present application;
fig. 6 is a flowchart of a step of outputting corresponding bright and dark line correction coefficients for a high definition image corresponding to each module, and then directly feeding back the bright and dark line correction coefficients to a display screen bright and dark line correction unit to realize bright and dark line correction of each module according to an embodiment of the present application;
FIG. 7 is a block diagram of an LED display screen comprising modules No. 1-25 corresponding to the flight path planning module according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a plurality of light points distributed around the centerline of the splicing seam between modules according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an acquired image of the top left corner module 1 of the LED display screen and a next step of the unmanned aerial vehicle according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an image collected by the middle module 2 at the top of the LED display screen and a next step of the unmanned aerial vehicle according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an image acquired by the top right corner module 8 of the LED display screen and a next step of the unmanned aerial vehicle according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, an embodiment of the present application discloses an unmanned aerial vehicle system 100 for correcting bright and dark lines of an LED display screen, which includes an unmanned aerial vehicle control subsystem 200 and a display screen control subsystem 300; the drone control subsystem 200 includes: an OCR recognition visual perception unit 120, a route planning module 130 and a module image acquisition and transmission unit 110; the unmanned aerial vehicle control subsystem 200 is arranged in the unmanned aerial vehicle controller;
a display control subsystem 300, comprising: a display screen bright and dark line correction unit 310; the display screen control subsystem 300 is disposed within the display screen controller;
in some optional embodiments, the display screen control subsystem 300 and the unmanned aerial vehicle control subsystem 200 are positioned by a Beidou satellite positioning system or a GPS satellite positioning system; the display screen control subsystem 300 and the unmanned aerial vehicle control subsystem perform data transmission through indoor or outdoor wireless communication; the wireless communication comprises 4G \/5G signal transmission;
as shown in fig. 2, the OCR recognition vision sensing unit 120 includes a forward looking vision detecting module 122, a forward looking vision OCR recognition module 121, a lower vision and ultrasonic sensor module 123, a ranging sensing module 124;
the forward-looking vision detection module 122 is used for detecting an LED display screen right in front of the unmanned aerial vehicle vision and selecting a horizontal fixed-point hovering position;
a lower vision and ultrasonic sensor module 123 for determining the longitudinal relative position of the drone to the ground;
the forward-looking vision OCR recognition module 121 is used for recognizing a starting point position of a flight path of the unmanned aerial vehicle through the OCR vision perception unit and sequentially recognizing a label in the center of each module of the LED display screen; specifically, the label may be a number, an image, a text, or a combination thereof;
the route planning module 130 is used for planning a flight route of the unmanned aerial vehicle, setting a fixed horizontal line moving distance and a fixed longitudinal moving distance according to different types of LED display screens according to the starting point position of the flight route of the unmanned aerial vehicle as the original point of the flight of the unmanned aerial vehicle; specifically, as shown in fig. 7, the module labels 1-25 sequentially recognized by the front vision OCR recognition module sequentially take pictures of the modules one by one, and the step of forming the picture-taking path includes: taking the highest line of modules of the LED display screen, taking the leftmost module 1 of 1-8 as the flight origin of the unmanned aerial vehicle, sequentially flying to the rightmost module 8 from the highest line of modules to the rightmost module right, then moving down one line, sequentially flying to the leftmost module 16 from the rightmost module 9 to the left, then moving down one line again, and repeating the steps; specifically, the flight route of the unmanned aerial vehicle during photographing is planned according to a 'bow' shape.
As shown in fig. 7, for example, the LED display screen corresponding to the route planning module of the present invention is composed of modules No. 1-25, each module has a corresponding unique digital label, the solid black line between the modules is the splicing seam between the modules, and the marked line with the arrow on the digital label is the route planned by a route; as shown in fig. 8, taking the 15 th module as an example, when the unmanned aerial vehicle finishes photographing from the module 1 to the module 3, the correction coefficients of the lower edge 91 of the module 1, the lower edge 92 of the module 2, and the lower edge 93 of the module 3 are sequentially obtained, that is, the correction coefficients of the upper edge of the corresponding module 16, the upper edge of the module 15, and the upper edge of the module 14, and so on; the upper side of module No. 15 and the lower side 92 of module No. 2 become common sides; all the public sides of the LED display screen module only need to calculate the correction coefficient once; through the route planning mode and the calculation mode thereof, the route planning method has the beneficial effect that the calculated amount for obtaining the correction coefficient of each module can be greatly reduced, so that the system is more smooth to operate, and the bright and dark line adjustment is quicker and more accurate.
In some optional embodiments, the step of the drone flying along the flight pattern includes: taking the leftmost module of the highest line of modules of the LED display screen as a flight original point of the unmanned aerial vehicle, sequentially flying the highest line of modules to the rightmost module rightmost, then moving at least two lines downwards, sequentially flying from the rightmost module leftmost to the leftmost module leftmost, then moving at least two lines downwards, and repeating the steps; specifically, a flight route when the unmanned aerial vehicle takes a picture is planned according to a bow shape; at the moment, the unmanned aerial vehicle can shoot a high-definition image comprising at least 2 modules for identifying and adjusting bright and dark lines;
the module image acquisition and transmission unit 110 is used for sequentially photographing the modules one by the module labels sequentially recognized by the front visual OCR recognition module according to the route planning and photographing sequence to form a photographing path, and then transmitting the module high-definition images obtained by sequential photographing to the display screen control subsystem by the unmanned aerial vehicle in real time; specifically, a flight route when the unmanned aerial vehicle takes a picture is planned according to the 'bow' shape, a picture taking sequence takes numbers recognized by a front vision OCR recognition module from 1 to 1000 as a reference, a picture taking path presents a 'bow' shape, then real-time high-definition picture transmission is carried out through an OCUSync picture transmission function, and the unmanned aerial vehicle transmits the picture to a computer;
the module image acquisition and transmission unit 110 comprises an acquisition module, wherein the acquisition module is used for acquiring the module images adjacent to four sides of the specified module in the acquisition view of the camera on the unmanned aerial vehicle when the specified module images are acquired, and finishing the flight task of the acquired images by combining the specified route planning and the OCR recognition technology;
the distance measurement sensing module 124 is used for acquiring the minimum safe sensing distance by the distance measurement sensing module of the unmanned aerial vehicle;
the display screen bright and dark line correction unit 310 is configured to output a corresponding bright and dark line correction coefficient for the high definition image corresponding to each module, and then directly feed back the bright and dark line correction coefficient to the display screen bright and dark line correction unit to realize bright and dark line correction of each module; for example, according to the Windows SDK function supported by the unmanned aerial vehicle, a corresponding bright and dark line correction coefficient is output for the high-definition image corresponding to each module, so that bright and dark line correction of each module is realized.
Referring to fig. 3, an embodiment of the present invention further provides a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle, where the method includes:
s900, detecting an LED display screen right in front of the vision of the unmanned aerial vehicle, and selecting a horizontal fixed point hovering position; in particular, the pointing hover position should be secure, reasonable;
s902, determining the longitudinal relative position of the unmanned aerial vehicle and the ground;
step S904, planning a flight path of the unmanned aerial vehicle, setting a fixed horizontal line moving distance and a fixed longitudinal moving distance according to different types of LED display screens according to the starting point position of the flight path of the unmanned aerial vehicle as the flight origin of the unmanned aerial vehicle;
step S906, determining the starting position of the flight path of the unmanned aerial vehicle through an OCR recognition visual perception unit; sequentially identifying the label in the center of each module of the LED display screen; according to the route planning and the photographing sequence, the modules are sequentially photographed one by the module labels sequentially recognized by the front vision OCR recognition module to form a photographing path, and then module high-definition images obtained by photographing in sequence are transmitted to the display screen control subsystem by the unmanned aerial vehicle in real time;
and step S908, outputting corresponding bright and dark line correction coefficients for the high-definition image corresponding to each module, and directly feeding the bright and dark line correction coefficients back to the bright and dark line correction unit of the display screen to realize bright and dark line correction of each module.
Referring to fig. 4, in some optional embodiments, the determining, by the OCR, the starting position of the flight path of the unmanned aerial vehicle by the OCR recognition visual perception unit; the label of discerning every module positive center of LED display screen in proper order discerns the label of every module positive center of LED display screen in proper order includes the step:
s100, acquiring an image data set with labels of the LED display screen modules, selecting the LED display screen to be in a test mode, and photographing each module through a mobile phone, a camera or other photographing equipment, wherein the photographing requirement needs to acquire label information of four edges of a single module and the center of the module;
step S102, acquiring image data sets with various characteristics by switching light point intervals and brightness values of light points; for example, the acquired image data set with diversified characteristics comprises 10000 images in total, and the label corresponding to each module has 10 different styles;
s104, obtaining an OCR recognition model, and selecting an OCR text recognition model combination; for example, under the condition of a digital label, a CTPN + CRNN model combination with better OCR text recognition performance is selected;
s106, retraining to obtain a corresponding model;
specifically, the digital label of the LED module is composed of discrete light points, so that training needs to be performed again to obtain a corresponding model;
for example, training is carried out under a deep learning frame Tensorflow-1.14.0+ CUDA10.0+ CuDNN7.6+ Python3.6+ Windows10 to obtain a model stored in a Pb format corresponding to CTPN + CRNN, namely the OCR recognition model;
step S108, transplanting an OCR recognition model to an OCR recognition visual perception unit of the unmanned aerial vehicle; for example, the OCR recognition model is called offline by implementing a programming language Java in the environment of Android Studio-4.1.2 and is embedded into the visual perception system of the unmanned aerial vehicle as a digital recognition module.
Referring to fig. 5, in some optional embodiments, the step of planning the flight path of the drone includes:
s200, determining coordinates of a return position, and connecting an unmanned aerial vehicle handle through a mobile phone in a wired manner; specifically, a DJI Fly program on a mobile phone is opened, an unmanned aerial vehicle of a specified model is selected, the unmanned aerial vehicle is connected with a handle, meanwhile, the signal recognition function can be automatically refreshed, the number is more than 8, the coordinates of a starting point can be accurately obtained, the unmanned aerial vehicle can normally take off through voice broadcast prompt, and the coordinates of the starting point and/or the returning point are determined;
s202, acquiring a starting point coordinate of a flight route, and enabling the unmanned aerial vehicle to quickly approach an LED display screen by selecting a normal flight mode on a handle; specifically, a ranging sensing module of the unmanned aerial vehicle can obtain the minimum safe sensing distance; for example, the minimum safe perception distance of the Yu Mavic AIR2 series of the unmanned plane in Xinjiang is 0.5 m, the visual angle of a camera of the unmanned plane is adjusted to 0 degree, namely the angle vertical to the LED display screen, the position of the unmanned plane is manually and finely adjusted, so that the digital label corresponding to the module 1 can be quickly found, and the starting point coordinate of the flight path is determined;
step S204, planning a flight path, and constructing a route model of the flight path; specifically, the route planning is a fixed route module embedded in the function of pointing the flight of the unmanned aerial vehicle; for each display screen with different models, the length and the width of a single module are different, modeling is carried out according to different models of the outdoor LED display screen, the coordinates of the starting point of the flight route are taken as the reference, the unmanned aerial vehicle is switched from the normal flight mode to the low-speed flight mode, and the horizontal distance of the horizontal movement and the vertical distance of the longitudinal movement of the unmanned aerial vehicle are set; for example, a route model of a bow-shaped flight route is constructed, after the flight of the bow-shaped flight route planned according to the route is finished, a return flight button is pressed, and the unmanned aerial vehicle returns to the position of a return flight point.
Referring to fig. 6, in some optional embodiments, the outputting of the corresponding bright and dark line correction coefficient for the high definition image corresponding to each module and then directly feeding back the bright and dark line correction coefficient to the display screen bright and dark line correction unit to realize the bright and dark line correction of each module includes the steps;
step S300, calculating a correction coefficient of each module bright and dark line; specifically, the flight starting point position is locked by the OCR recognition visual perception unit, then the module is photographed according to the planned flight route and the recognized module number sequence, the photo photographed in real time based on the OCUSync image transmission function of the unmanned aerial vehicle is transmitted to an A-Deline mobile phone program, and the bright and dark line correction coefficient of each module with the digital label is obtained and stored;
step S302, compensating a feedback correction coefficient; specifically, according to the sequence of the module labels, when the current module picture is shot, the compensation coefficient of the last module is fed back to the LED display screen, and the process is circulated in sequence until the compensation of the correction coefficient of the last module is completed.
The invention relates to a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle based on OCR recognition, which provides great convenience for acquiring images of a bright and dark line acquisition module of an outdoor LED display screen through intelligent shooting and recognition modes such as OCR recognition technology, fixed-point hovering of the unmanned aerial vehicle and the like, and reduces the risk of correcting the display screen at high altitude and the correction precision; each module is independently decoupled, so that the further expansion and development of the single module can be realized by the subsequent actual requirements;
in some optional embodiments, the method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle further includes:
acquiring the minimum safe sensing distance between the unmanned aerial vehicle and the LED display screen in real time;
and if the safety perception distance is smaller than a set value, giving an alarm, and automatically enabling the unmanned aerial vehicle to fly in parallel with the LED display screen by the minimum set value.
In some optional embodiments, before detecting the LED display screen directly in front of the drone vision, the method further comprises:
setting a splicing seam between modules as a central line, and respectively selecting two rows of lamp beads on two sides of the central line;
and setting the cross-shaped intersection between any four adjacent modules as a non-lighting lamp point.
In some optional embodiments, the module labels sequentially recognized by the front vision OCR recognition module sequentially take pictures of the modules one by one, and the step of forming the picture-taking path includes:
the module on the leftmost side of the module on the highest line of the LED display screen is used as the flight original point of the unmanned aerial vehicle, the module on the highest line is sequentially extended to fly to the module on the rightmost side, the module on the rightmost side is sequentially flown to the module on the leftmost side downwards, then the module on the rightmost side downwards moves one line, and the steps are repeated.
In some optional embodiments, the correction coefficient of the bright and dark line of each module is calculated only once on the common side of each module of the LED display screen, which is connected with other modules;
in some optional embodiments, the acquiring an image data set with a tag of an LED display screen module, selecting the LED display screen to a test mode, and taking a picture of each module through a mobile phone, a camera, or other shooting devices, where the requirement of taking a picture requires acquiring tag information of four edges of a single module and the center of the module, further includes:
when gathering appointed module image, the collection field of vision of camera on the unmanned aerial vehicle can include with the adjacent module image in appointed module four limits, combines appointed airline planning and OCR recognition technology, accomplishes the flight task who gathers the image. For example, in the case of a digital tag, the flight task of acquiring images is completed precisely in a mode in which the number is increased by 1 from small to large. The specific image acquisition mode is shown in fig. 8-11, wherein fig. 9 is an image acquired by the vertex angle module 1 at the upper left of the LED display screen, and a dotted arrow indicates the next step of the unmanned aerial vehicle; fig. 10 is an image of the top of the LED display screen near the middle module 2, and the dotted arrow indicates the next step of the unmanned aerial vehicle; fig. 11 is an acquired image of the vertex angle module 8 at the upper right of the LED display screen, and a dotted arrow indicates the next step of the unmanned aerial vehicle; the collection image of LED display screen middle part module 15 in fig. 8, unmanned aerial vehicle is advanced to module 16 by module 15 along the central line of module 15 and module 16 on next step.
As shown in fig. 8, in some optional embodiments, when the unmanned aerial vehicle is ready to take off according to the planned route, the LED display screen is adjusted to the test mode, and when taking the module No. 15 as an example, the unmanned aerial vehicle acquires a module light distribution map when taking a picture of the module No. 15; the collected module lamp point distribution diagram shows that a plurality of lamp points are distributed on the LED display screen module; taking the splicing seams among the modules as central lines, only selecting at least two rows of lamp beads at two sides of the central lines of a plurality of lamp points, and performing high-definition image acquisition and calculation; the method has the advantages that the size of the picture can be reduced, and the correction coefficient can be conveniently calculated in a large amount at the later stage; in some alternative embodiments, the intersection of the crosses of adjacent modules (e.g., intersection 94 of adjacent modules), without illuminating the lamp, is to facilitate the segmentation of each edge of the individual modules, in such a way that the accuracy of the correction factor is advantageously higher.
The invention also provides a device for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle, which comprises a light source, a light source and a light source; the invention provides a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle.
The invention further provides a storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements a method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle according to any one of the embodiments of the invention.
Any embodiment of the invention has the beneficial effect of improving the checking efficiency and accuracy of the LED display screen.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the components is only one logical division, and other divisions may be realized in practice.
In addition, functional modules/components in the embodiments of the present invention may be integrated into the same processing module/component, or each of the modules/components may exist alone physically, or two or more modules/components may be integrated into the same module/component. The integrated modules/components can be implemented in the form of hardware, or in the form of hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not to denote any particular order.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An unmanned aerial vehicle system for correcting bright and dark lines of an LED display screen is characterized by comprising an unmanned aerial vehicle control subsystem and a display screen control subsystem;
the unmanned aerial vehicle control subsystem includes: the system comprises an OCR recognition visual perception unit, a route planning module and a module image acquisition and transmission unit; the unmanned aerial vehicle control subsystem is arranged in the unmanned aerial vehicle controller;
the display screen control subsystem includes: a display screen bright and dark line correction unit; the display screen control subsystem is arranged in the display screen controller;
the OCR recognition vision perception unit comprises a forward-looking vision detection module, a forward-looking vision OCR recognition module, a lower vision and ultrasonic sensor module and a distance measurement perception module;
the forward-looking vision detection module is used for detecting an LED display screen right in front of the unmanned aerial vehicle vision and selecting a horizontal fixed-point hovering position;
the lower vision and ultrasonic sensor module is used for determining the longitudinal relative position of the unmanned aerial vehicle and the ground;
the forward-looking vision OCR recognition module is used for determining the starting point position of the flight path of the unmanned aerial vehicle through the OCR recognition vision perception unit and sequentially recognizing a label in the center of each module of the LED display screen;
the route planning module is used for planning a flight route of the unmanned aerial vehicle, setting a fixed horizontal line moving distance and a fixed longitudinal moving distance according to different types of LED display screens according to the starting point position of the flight route of the unmanned aerial vehicle as the original point of the unmanned aerial vehicle;
the module image acquisition and transmission unit is used for sequentially photographing the modules one by the module labels sequentially recognized by the front vision OCR recognition module according to the route planning and the photographing sequence to form a photographing path, and then transmitting the module high-definition images obtained by sequentially photographing to the display screen control subsystem by the unmanned aerial vehicle in real time;
the module image acquisition and transmission unit comprises an acquisition module; the acquisition module is used for acquiring the designated module images, wherein the acquisition field of vision of the camera on the unmanned aerial vehicle comprises the module images adjacent to four sides of the designated module, and the flight task of the acquired images is completed by combining the designated route planning and the OCR recognition technology;
the distance measurement sensing module is used for acquiring the minimum safe sensing distance between the unmanned aerial vehicle and the LED display screen by the distance measurement sensing module of the unmanned aerial vehicle;
and the display screen bright and dark line correction unit is used for outputting corresponding bright and dark line correction coefficients for the high-definition images corresponding to each module, and then directly feeding the bright and dark line correction coefficients back to the display screen bright and dark line correction unit to realize bright and dark line correction of each module.
2. A method for correcting bright and dark lines of an LED display screen by an unmanned aerial vehicle is characterized by comprising the following steps:
detecting an LED display screen right in front of the vision of the unmanned aerial vehicle, and selecting a horizontal fixed-point hovering position;
determining the longitudinal relative position of the unmanned aerial vehicle and the ground;
planning a flight route of the unmanned aerial vehicle, setting a fixed transverse line moving distance and a fixed longitudinal moving distance according to different types of LED display screens by taking the starting point position of the flight route of the unmanned aerial vehicle as the original point of the flight of the unmanned aerial vehicle;
determining the starting point position of the flight path of the unmanned aerial vehicle by an OCR recognition visual perception unit; sequentially identifying a label in the center of each module of the LED display screen; according to the route planning and the photographing sequence, the modules are sequentially photographed one by the module labels sequentially recognized by the front vision OCR recognition module to form a photographing path, and then module high-definition images obtained by photographing in sequence are transmitted to the display screen control subsystem by the unmanned aerial vehicle in real time;
and outputting corresponding bright and dark line correction coefficients for the high-definition images corresponding to each module, and directly feeding the bright and dark line correction coefficients back to the bright and dark line correction unit of the display screen to realize bright and dark line correction of each module.
3. The method for correcting the bright and dark lines of the LED display screen of the unmanned aerial vehicle as claimed in claim 2, wherein the starting position of the flight path of the unmanned aerial vehicle is determined by the OCR recognition visual perception unit; discern the label in every module positive center of LED display screen in proper order, include the step:
acquiring an image data set with labels of LED display screen modules, selecting a test mode for the LED display screen, and taking a picture of each module through a mobile phone, a camera or other shooting equipment, wherein the requirement of taking the picture needs to acquire label information of four edges of a single module and the center of the module;
acquiring image data sets with various characteristics by switching light point intervals and brightness values of light points; for example, the acquired image data set with diversified characteristics comprises 10000 images in total, and the label corresponding to each module has 10 different styles;
obtaining an OCR recognition model, and selecting an OCR text recognition model combination; for example, a CTPN + CRNN model combination with better OCR text recognition performance is selected;
training again to obtain a corresponding model;
and transplanting the OCR recognition model to an OCR recognition visual perception unit of the unmanned aerial vehicle.
4. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 2, wherein the step of planning the flight path of the unmanned aerial vehicle comprises:
determining the coordinates of the return position, and connecting the coordinates with the handle of the unmanned aerial vehicle through a mobile phone in a wired manner;
acquiring the coordinates of the starting point of a flight route, and enabling the unmanned aerial vehicle to quickly approach the LED display screen by selecting a normal flight mode on the handle;
and planning the flight path, and constructing a route model of the flight path.
5. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 2, wherein the step of outputting the corresponding bright and dark line correction coefficient to the high definition map corresponding to each module and then directly feeding back the bright and dark line correction coefficient to the bright and dark line correction unit of the display screen to realize the bright and dark line correction of each module comprises the steps of;
calculating a correction coefficient of the bright and dark lines of each module;
compensating a feedback correction coefficient; specifically, according to the sequence of the module labels, when the current module picture is shot, the compensation coefficient of the last module is fed back to the LED display screen, and the process is circulated in sequence until the compensation of the correction coefficient of the last module is completed.
6. The method for correcting bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 2, wherein the method further comprises:
acquiring the minimum safe sensing distance between the unmanned aerial vehicle and the LED display screen in real time;
and if the safety perception distance is smaller than the set value, giving an alarm, and automatically enabling the unmanned aerial vehicle to fly in parallel with the LED display screen by using the minimum set value.
7. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 2, wherein the step of detecting the LED display screen right in front of the unmanned aerial vehicle vision further comprises the following steps:
setting splicing seams among the modules as central lines, and respectively selecting two rows of lamp beads on two sides of the central lines;
and setting the cross between any four adjacent modules as a non-lighting lamp point.
8. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 2, wherein the module labels sequentially recognized by the front vision OCR recognition module sequentially take pictures of the modules one by one, and the step of forming the picture taking path comprises:
the module on the leftmost side of the module on the highest line of the LED display screen is used as the flight original point of the unmanned aerial vehicle, the module on the highest line is sequentially extended to fly to the module on the rightmost side, the module on the rightmost side is sequentially flown to the module on the leftmost side downwards, then the module on the rightmost side downwards moves one line, and the steps are repeated.
9. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in claim 3, wherein the method comprises the steps of obtaining an image data set with labels of the LED display screen modules, selecting the LED display screen to be in a test mode, and taking a picture of each module through a mobile phone, a camera or other shooting equipment, wherein the requirement of taking the picture requires obtaining label information of four edges of each module and the center of the module, and the method further comprises the following steps:
when gathering appointed module image, the collection field of vision of camera on the unmanned aerial vehicle can include the module image adjacent with four limits of appointed module, combines appointed airline planning and OCR recognition technology, accomplishes the flight task of gathering the image.
10. The method for correcting the bright and dark lines of the LED display screen by the unmanned aerial vehicle as claimed in any one of claims 2 to 9, wherein the common side of each module of the LED display screen, which is formed by connecting with other modules, is used for calculating the correction coefficient of the bright and dark lines of each module only once.
11. An unmanned aerial vehicle device for correcting bright and dark lines of an LED display screen is characterized by comprising; the unmanned aerial vehicle bright and dark line correction method for the LED display screen, disclosed by any one of claims 2 to 9.
12. A storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the drone LED display screen bright and dark line correction method of claims 2-9.
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