CN111901644B - LED display screen playing system - Google Patents

LED display screen playing system Download PDF

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Publication number
CN111901644B
CN111901644B CN202010611438.9A CN202010611438A CN111901644B CN 111901644 B CN111901644 B CN 111901644B CN 202010611438 A CN202010611438 A CN 202010611438A CN 111901644 B CN111901644 B CN 111901644B
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display screen
led display
speed
user
signal
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CN111901644A (en
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王磊
范德满
沈义军
禹双双
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Jiangsu Baixun Technology Development Co ltd
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Jiangsu Baixun Technology Development Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41415—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration
    • H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

Abstract

The invention provides an LED display screen playing system, which comprises: the upper computer sends video image data; the data processing module is used for processing the video image data to obtain a linear display signal; the LED display screen displays linear display signals; the optical fiber is connected with the upper computer and the data processing module and transmits video image data to the data processing module; and the network cable is connected with the data processing module and the LED display screen and transmits the linear display signal to the LED display screen. According to the LED display screen playing system, the display image quality of the LED display screen is improved, an interactive control function is provided for a user, and great convenience is provided for the user to directly control the playing content of the LED display screen.

Description

LED display screen playing system
Technical Field
The invention relates to the field of media playing and technical control, in particular to an LED display screen playing system.
Background
At present, with the rapid development of the electronic information era, electronic display, control and information transmission technologies are continuously improved, and the traditional video display is mature and intelligent. The LED display screen is widely applied, and can be seen anywhere in cities from small still pictures to large outdoor videos.
However, in the conventional LED display screen playing system, in the aspect of data processing, due to the technical problem, the video image data cannot be optimally processed, so that the display image quality of the LED display screen has a large space for improvement. Meanwhile, when the LED display screen playing system wants to control the playing content, the user needs to operate the upper computer, which is troublesome.
Disclosure of Invention
One of the objectives of the present invention is to provide an LED display screen playing system, which not only improves the display image quality of the LED display screen, but also provides an interactive control function for a user, and provides great convenience for the user to directly control the playing content of the LED display screen.
The embodiment of the invention provides an LED display screen playing system, which comprises:
the upper computer is used for sending video image data;
the data processing module is electrically connected with the upper computer through an optical fiber;
the LED display screen is electrically connected with the data processing module through a network cable;
the data processing module acquires the video image data sent by the upper computer through the optical fiber, and processes the video image data to obtain a linear display signal; the LED display screen obtains the linear display signal through the network cable, and the LED display screen displays the linear display signal.
Preferably, the LED display screen playing system further comprises:
the host computer includes: one of a PC and a video image injection device;
the data processing module comprises: the system comprises a first-stage controller and a second-stage controller electrically connected with the first-stage controller;
the LED display screen includes: the display device comprises a driving chip and a display unit electrically connected with the driving chip;
wherein the first level controller comprises: the device comprises a DVI decoding unit, a signal copying unit electrically connected with the DVI decoding unit, a first FPGA signal processing unit electrically connected with the signal copying unit, an ARM chip control unit electrically connected with the first FPGA signal processing unit, and an SRAM memory electrically connected with the ARM chip control unit;
the second level controller comprises: and the second FPGA signal processing unit.
Preferably, the processing the video image data by the data processing module to obtain a linear display signal specifically includes:
acquiring the video image data sent by the upper computer through an optical fiber;
decoding the video image data through the DVI decoding unit to obtain a decoded video signal;
copying the decoded video signal by the signal copying unit to obtain a copied decoded video signal;
the ARM chip control unit controls the first FPGA signal processing unit to convert the copied and decoded video signal into a high-speed video signal;
sending the high speed video signal to the second level controller;
and processing the high-speed video signal through the second FPGA signal processing unit of the second-level controller to obtain the linear display signal.
Preferably, the displaying of the linear display signal by the LED display screen specifically includes:
the LED display screen obtains the linear display signal obtained by processing the video image data through the data processing module through the network cable;
the driving chip performs gray scale control processing on the linear display signals and then sends the linear display signals to the display unit in a parallel transmission mode;
the display unit displays the linear display signal subjected to the gray scale control processing.
Preferably, the processing the high-speed video signal by the second FPGA signal processing unit to obtain the linear display signal specifically includes:
acquiring the high-speed video signal;
processing the high-speed video signal to obtain a high-speed video image;
extracting pixel gray values and gray levels of the high-speed video image;
converting the high-speed video image into a linear video image according to a correction conversion function;
processing the linear video image to obtain the linear display signal;
wherein the correction conversion function is:
Figure GDA0002853490320000031
wherein, POIs the gray value of the linear video image; pIThe gray value of the high-speed video image is obtained; k is a parameter for controlling the shape of the transfer function curve; a is a constant, and the larger the value of A is, the darker the overall brightness of the linear video image is; g is the gray level of the high-speed video image; g is the pixel gray value of the high-speed video image; n isgThe number of pixels of the input image with the gray value of g; x is a constant and controls the inclination of the transfer function curve; y is a constant controlling the slope and height of the transfer function curve.
Preferably, the optical fiber transmits the high-speed video signal to the second-level controller in a serial transmission mode;
and the network cable transmits the linear display signal to the LED display screen in a serial transmission mode.
Preferably, the LED display screen playing system further comprises:
the image interaction module is electrically connected with the LED display screen and is used for realizing interaction with a user;
the image interaction module executes the following operations:
acquiring a first interaction action of a user, and triggering to enter a user interaction control mode;
acquiring an image of an area of a second interaction action of the user through the image interaction module;
determining a three-dimensional coordinate system by taking the position of the image interaction module as an origin;
obtaining a first time t1Represents a first point (X) of a first position of said second interactive movement2,1,Y2,1,Z2,1) And a first vector P representing a direction of a first finger2,1＝{L2,1,M2,1,N2,1}；
Obtaining a second time t2A second point (X) representing a second position of said second interactive action2,2,Y2,2,Z2,2) And a second vector P representing the direction of the second finger2,2＝{L2,2,M2,2,N2,2}；
Acquiring a third point (X) representing a center position of the LED display screen3,Y3,Z3)；
Determining at the first time t from the first point, the first vector and the third point1If so, whether the finger of the user points to the LED display screen or not;
determining at the second time t based on the second point, the second vector and the third point2If so, whether the finger of the user points to the LED display screen or not;
when the first time t1And said second time t2When the fingers of the user point to the LED display screen, the second interaction action is analyzed to obtain an interaction control command;
if any interactive control command is not received within a first preset time after the last interactive control command is executed, exiting the user interactive control mode;
wherein, t2－t1D, becoming delta t which is a preset time discontinuity value;
is determined at a first time t1And if the finger of the user points to the LED display screen, the method specifically comprises the following steps:
substituting the first point, the first vector and the third point into the following calculation formula:
Figure GDA0002853490320000041
when the included angle alpha is smaller than the preset included angle value, the included angle alpha is determined to be at the first moment t1When the user touches the LED display screen, the finger of the user points to the LED display screen;
is determined at a second time t2If the user's finger is pointing at the LED display screen, in particularThe method comprises the following steps: substituting the second point, the second vector and the third point into the following calculation formula:
Figure GDA0002853490320000042
when the included angle beta is smaller than the preset included angle value, the included angle beta is determined to be at the second moment t2And when the user touches the LED display screen, the finger of the user points to the LED display screen.
Preferably, the analyzing the second interactive action to obtain the interactive control command specifically includes:
determining the direction and the speed of the second interactive action according to the first point, the second point and the difference value between the first moment and the second moment;
when the second interaction action is performed leftwards by the user and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen retreats for a first preset time, or when the second interaction action is performed leftwards by the user and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen retreats at a first fast-backward speed;
when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to a first preset speed, the video played by the LED display screen retreats for a second preset time, or when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen retreats quickly at a second quick-retreat speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen is fast forwarded for a first preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen is fast forwarded at the first fast-forward speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen is fast-forwarded for a second preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen is fast-forwarded at the second fast-forward speed;
when the second interaction action is made by the user upwards and the speed of the second interaction action is lower than a first preset speed, switching the video played by the LED display screen to the next video of the series in the prestored play list;
when the second interaction action is made by the user upwards and the speed of the second interaction action is greater than or equal to a first preset speed, switching the video played by the LED display screen to the next series in the prestored playlist;
when the second interaction action is made downwards by the user and the speed of the second interaction action is lower than a first preset speed, switching the video played by the LED display screen to the last video of the series in the pre-stored play list;
and when the second interaction action is performed downwards by the user and the speed of the second interaction action is greater than or equal to a first preset speed, switching the video played by the LED display screen to the last series in the prestored play list.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an LED display screen playing system according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
An embodiment of the present invention provides an LED display screen playing system, as shown in fig. 1, including:
the upper computer 1 is used for sending video image data;
the data processing module 2 is electrically connected with the upper computer 1 through an optical fiber;
the LED display screen 3 is electrically connected with the data processing module 2 through a network cable;
the data processing module 2 acquires the video image data sent by the upper computer 1 through the optical fiber, and the data processing module 2 processes the video image data to acquire a linear display signal; the LED display screen 3 obtains the linear display signal through the network cable, and the LED display screen 3 displays the linear display signal.
The working principle of the technical scheme is as follows: the LED display screen playing system comprises an upper computer 1, a data processing module 2 and an LED display screen 3; the upper computer 1 is electrically connected with the data processing module 2 through the optical fiber; the data processing module 2 and the LED display screen 3 are directly and electrically connected through a network cable; firstly, the data processing module 2 acquires the video image data sent by the upper computer 1 through the optical fiber; then, the data processing module 2 processes the video image data to obtain a linear display signal; wherein, because the LED display screen 3 is a linear display, the linear display signal is a signal for the LED display screen 3 to display; finally, the LED display screen 3 acquires the linear display signal through the network cable, and the LED display screen 3 displays the linear display signal;
for example: a user wants to play a commodity propaganda advertisement through the LED display screen 3 installed on a shop background wall, selects an advertisement video through operation of the upper computer 1, the upper computer 1 sends advertisement video data to the data processing module 2 through the optical fiber, the data processing module 2 processes the advertisement video data to obtain a linear display signal which can be displayed by the LED display screen 3, and the LED display screen 3 obtains the linear display signal through the network cable and displays the linear display signal.
The beneficial effects of the above technical scheme are: host computer 1 with adopt between the data processing module 2 optical fiber connection, data processing module 2 with adopt between the LED display screen 3 the net twine is connected, has guaranteed LED display screen 3 can show high definition video and do not have the picture to delay, has promoted LED display screen 3's the display image quality.
The embodiment of the invention provides an LED display screen playing system, which further comprises:
the upper computer 1 includes: one of a PC and a video image injection device;
the data processing module 2 includes: the system comprises a first-stage controller and a second-stage controller electrically connected with the first-stage controller;
the LED display screen 3 includes: the display device comprises a driving chip and a display unit electrically connected with the driving chip;
wherein the first level controller comprises: the device comprises a DVI decoding unit, a signal copying unit electrically connected with the DVI decoding unit, a first FPGA signal processing unit electrically connected with the signal copying unit, an ARM chip control unit electrically connected with the first FPGA signal processing unit, and an SRAM memory electrically connected with the ARM chip control unit;
the second level controller comprises: and the second FPGA signal processing unit.
The working principle of the technical scheme is as follows: the upper computer 1 is one of a PC (personal computer) and a video image injection device; the video image injection device is specifically: memory cards or cameras; the PC can change the video source information to be played at any time according to the user requirement;
the data processing module 2 consists of a first-level controller and a second-level controller; wherein the first level controller and the second level controller are cascaded;
the LED display screen 3 consists of a driving chip and a display unit; the driving chip can perform gray control on the image played by the LED display screen 3; the unit is used for displaying the linear display signal;
the first-stage controller consists of a DVI decoding unit, a signal copying unit, a first FPGA signal processing unit and an ARM chip control unit; the DVI decoding unit is used for decoding data, the signal copying unit is used for copying signals, the first FPGA signal processing unit is used for converting original signals into high-speed signals, the ARM chip control unit is a controller of the first-level controller, and the SRAM memory is a memory of the first-level controller;
the second-stage controller consists of a second FPGA signal processing unit; and the second FPGA signal processing unit is used for carrying out correction conversion on the high-speed signal.
The beneficial effects of the above technical scheme are: according to the data processing unit, the first-level controller and the second-level controller are cascaded, so that the data processing performance of the system is improved, the data is optimized, and the display image quality of the LED display screen 3 is improved.
The embodiment of the invention provides an LED display screen playing system, wherein the data processing module 2 is used for processing the video image data to obtain a linear display signal and specifically comprises the following steps:
acquiring the video image data sent by the upper computer 1 through an optical fiber;
decoding the video image data through the DVI decoding unit to obtain a decoded video signal;
copying the decoded video signal by the signal copying unit to obtain a copied decoded video signal;
the ARM chip control unit controls the first FPGA signal processing unit to convert the copied and decoded video signal into a high-speed video signal;
sending the high speed video signal to the second level controller;
and processing the high-speed video signal through the second FPGA signal processing unit of the second-level controller to obtain the linear display signal.
The working principle of the technical scheme is as follows: since the LED display screen 3 is used for linear display, the video image data needs to be processed to obtain the linear display signal that can be displayed by the LED display screen 3;
the DVI decoding unit may decode data; wherein the decoded video signal is a signal obtained by performing a decoding operation on the video image data;
the signal copying unit may copy a signal; wherein the reproduced decoded video signal is a signal obtained by performing a reproduction operation on the decoded video signal;
the first FPGA signal processing unit converts the copied and decoded video signal into a high-speed video signal and stores the high-speed video signal into the SRAM memory in a ping-pong read-write mode; the high-speed video signal is a signal obtained by converting the copied and decoded video signal through the first FPGA signal processing unit;
the second FPGA signal processing unit in the second-stage controller can perform linear correction conversion on signals; wherein the linear display signal is a signal obtained by performing linear correction conversion on the high-speed video signal; the linear display signal is a signal for display by the LED display screen 3.
The beneficial effects of the above technical scheme are: the invention processes the video image data to obtain the linear display signal, thereby not only ensuring the speed of data transmission, but also improving the stability and reliability of data transmission, and further improving the display image quality of the LED display screen 3.
The embodiment of the invention provides an LED display screen playing system, wherein the step of displaying the linear display signal by the LED display screen 3 specifically comprises the following steps:
the LED display screen 3 acquires the linear display signals obtained by processing the video image data through the data processing module 2 through the network cable;
the driving chip performs gray scale control processing on the linear display signals and then sends the linear display signals to the display unit in a parallel transmission mode;
the display unit displays the linear display signal subjected to the gray scale control processing.
The working principle of the technical scheme is as follows: firstly, the LED display screen 3 acquires the linear display signal obtained by processing the video image data through the data processing module 2 through the network cable; then, the driving chip performs gray control processing on the linear display signals and then sends the linear display signals to the display unit in a parallel transmission mode; at present, the gray scale of the LED display screen 3 is divided into: 256-level gray, 1024-level gray, 4096-level gray, and 16384-level gray; the parallel transmission mode is that a plurality of data bits send out data simultaneously among devices, namely each data bit occupies one channel; and finally, the display unit displays the linear display signal subjected to the gray scale control processing.
The beneficial effects of the above technical scheme are: the driving chip performs the gray scale control processing on the linear display signal and then sends the linear display signal to the display unit, so that the display image quality of the LED display screen 3 can be improved.
The embodiment of the present invention provides an LED display screen playing system, where the processing of the high-speed video signal by the second FPGA signal processing unit to obtain the linear display signal specifically includes:
acquiring the high-speed video signal through the optical fiber;
processing the high-speed video signal to obtain a high-speed video image;
extracting pixel gray values and gray levels of the high-speed video image;
converting the high-speed video image into a linear video image according to a correction conversion function;
processing the linear video image to obtain the linear display signal;
wherein the correction conversion function is:
Figure GDA0002853490320000101
wherein, POIs the gray value of the linear video image; pIThe gray value of the high-speed video image is obtained; k is a parameter for controlling the shape of the transfer function curve; a is a constant, and the larger the value of A is, the darker the overall brightness of the linear video image is; g is the gray level of the high-speed video image; g is the pixel gray value of the high-speed video image; n isgThe number of pixels of the input image with the gray value of g; x is a constant and controls the inclination of the transfer function curve; y is a constant controlling the slope and height of the transfer function curve.
The working principle of the technical scheme is as follows: after the high-speed video image is converted into the linear video image through the correction conversion function, processing the linear video image to obtain the linear display signal; the correction conversion function can realize nonlinear compensation on the high-speed video image by adjusting the pixel gray value and the gray level of the high-speed video image, so that the image and the display brightness are changed linearly; and the correction conversion function performs enhancement processing on the pixel gray value and the gray level of the high-speed video image, so that the output linear video image has enhancement effect.
The beneficial effects of the above technical scheme are: according to the invention, the high-speed video signal is processed through the correction function to obtain the linear display signal for the LED display screen 3 to display, and data can be enhanced, so that the image displayed by the LED display screen 3 has a better enhancement effect, and the display image quality of the LED display screen 3 is improved.
The embodiment of the invention provides an LED display screen playing system, wherein an optical fiber transmits a high-speed video signal to a second-level controller in a serial transmission mode;
the network cable transmits the linear display signal to the LED display screen 3 in a serial transmission mode.
The working principle of the technical scheme is as follows: the optical fiber transmits the high-speed video signal to the second-level controller in a serial transmission mode; the network cable transmits the linear display signal to the LED display screen 3 in a serial transmission mode; the serial transmission mode is characterized in that data is transmitted on a physical channel one bit at a time, and each bit of data occupies a fixed time length by taking time as a unit.
The beneficial effects of the above technical scheme are: when the high-speed video signal and the linear display signal are transmitted, the transmission data volume is large, the data transmission is complex, the data can be transmitted more stably by adopting a serial transmission mode, the display stability of the LED display screen 3 is improved, and the display image quality of the LED display screen 3 is improved.
The embodiment of the invention provides an LED display screen playing system, which further comprises:
the image interaction module is electrically connected with the LED display screen and is used for realizing interaction with a user;
the image interaction module executes the following operations:
acquiring a first interaction action of a user, and triggering to enter a user interaction control mode;
acquiring an image of an area of a second interaction action of the user through the image interaction module;
determining a three-dimensional coordinate system by taking the position of the image interaction module as an origin;
obtaining a first time t1Represents a first point (X) of a first position of said second interactive movement2,1,Y2,1,Z2,1) And a first vector P representing a direction of a first finger2,1＝{L2,1,M2,1,N2,1}；
Obtaining a second time t2A second point (X) representing a second position of said second interactive action2,2,Y2,2,Z2,2) And a second vector P representing the direction of the second finger2,2＝{L2,2,M2,2,N2,2}；
Acquiring a third point (X) representing a center position of the LED display screen3,Y3,Z3)；
Determining at the first time t from the first point, the first vector and the third point1If so, whether the finger of the user points to the LED display screen or not;
determining at the second time t based on the second point, the second vector and the third point2If so, whether the finger of the user points to the LED display screen or not;
when the first time t1And said second time t2When the fingers of the user point to the LED display screen, the second interaction action is analyzed to obtain an interaction control command;
if any interactive control command is not received within a first preset time after the last interactive control command is executed, exiting the user interactive control mode;
wherein, t2－t1D, becoming delta t which is a preset time discontinuity value;
is determined at a first time t1And if the finger of the user points to the LED display screen, the method specifically comprises the following steps:
substituting the first point, the first vector and the third point into the following calculation formula:
Figure GDA0002853490320000121
when the included angle alpha is smaller than the preset included angle value, the included angle alpha is determined to be at the first moment t1When the user touches the LED display screen, the finger of the user points to the LED display screen;
is determined at a second time t2And if the finger of the user points to the LED display screen, the method specifically comprises the following steps: substituting the second point, the second vector and the third point into the following calculation formula:
Figure GDA0002853490320000131
when the included angle beta is smaller than the preset included angle value, the included angle beta is determined to be at the second moment t2And when the user touches the LED display screen, the finger of the user points to the LED display screen.
The working principle of the technical scheme is as follows: when the LED display screen playing system is applied to families to replace the traditional television; at the moment, the user watches videos or programs by using the LED display screen 3; the user lies or sits on the sofa, at the moment, the user needs to control the video played on the LED display screen 3, the user needs to stand up to control the upper computer 1 slightly inconveniently, and the user needs to stand up or extend the arms; for the user who is enjoying the fun of watching the film at home, the experience is very inconvenient.
The beneficial effects of the above technical scheme are: the invention provides an interactive control function for the user, provides great convenience for the user to directly control the playing content of the LED display screen, and improves the film watching experience of the user.
The embodiment of the invention provides an LED display screen playing system, wherein the step of analyzing the second interactive action to obtain an interactive control command specifically comprises the following steps:
determining the direction and the speed of the second interactive action according to the first point, the second point and the difference value between the first moment and the second moment;
when the second interaction action is made leftward by the user and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen 3 retreats for a first preset time, or when the second interaction action is made leftward by the user and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen 3 retreats at a first fast speed;
when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen 3 retreats for a second preset time, or when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen 3 retreats quickly at a second quick-retreat speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen 3 is fast-forwarded for a first preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen 3 is fast-forwarded at the first fast-forward speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen 3 is fast forwarded for a second preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen 3 is fast forwarded at the second fast forwarding speed;
when the second interaction action is made by the user upwards and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen 3 is switched to the next video of the series in the pre-stored playlist;
when the second interaction action is performed upwards by the user and the speed of the second interaction action is greater than or equal to a first preset speed, switching the video played by the LED display screen 3 to the next series in the pre-stored playlist;
when the second interaction action is made downwards by the user and the speed of the second interaction action is lower than a first preset speed, switching the video played by the LED display screen 3 to the last video of the series in the pre-stored play list;
when the second interactive action is made downwards by the user and the speed of the second interactive action is greater than or equal to a first preset speed, the video played by the LED display screen 3 is switched to the last series in the pre-stored play list.
The working principle of the technical scheme is as follows: and controlling the speed and the content of the video played by the LED display screen 3 according to the direction and the speed of the interactive action. In addition, other control commands, such as: the interactive action is that the control volume is increased from the left lower part to the right upper part, the control volume is reduced from the right upper part to the left lower part, the brightness of the screen is controlled to be reduced from the left upper part to the right lower part, and the brightness of the screen is controlled to be increased from the right lower part to the left upper part.
The beneficial effects of the above technical scheme are: by setting the LED display screen 3 playing system of the embodiment, a user can conveniently and rapidly control and operate the video content played by the LED display screen 3.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. An LED display screen playing system, comprising:
the upper computer is used for sending video image data;
the data processing module is electrically connected with the upper computer through an optical fiber;
the LED display screen is electrically connected with the data processing module through a network cable;
the data processing module acquires the video image data sent by the upper computer through the optical fiber, and processes the video image data to obtain a linear display signal; the LED display screen acquires the linear display signal through the network cable, and the LED display screen displays the linear display signal;
the host computer includes: one of a PC and a video image injection device;
the data processing module comprises: the second-stage controller is electrically connected with the first-stage controller through the optical fiber;
the LED display screen includes: the display device comprises a driving chip and a display unit electrically connected with the driving chip;
wherein the first level controller comprises: the device comprises a DVI decoding unit, a signal copying unit electrically connected with the DVI decoding unit, a first FPGA signal processing unit electrically connected with the signal copying unit, an ARM chip control unit electrically connected with the first FPGA signal processing unit, and an SRAM memory electrically connected with the ARM chip control unit;
the second level controller comprises: a second FPGA signal processing unit;
the image interaction module is electrically connected with the LED display screen and is used for realizing interaction with a user;
the image interaction module executes the following operations:
acquiring a first interaction action of a user, and triggering to enter a user interaction control mode;
acquiring an image of an area of a second interaction action of the user through the image interaction module;
determining a three-dimensional coordinate system by taking the position of the image interaction module as an origin;
obtaining a first time t1Represents a first point (X) of a first position of said second interactive movement2,1,Y2,1,Z2,1) And a first vector P representing a direction of a first finger2,1＝{L2,1,M2,1,N2,1}；
Obtaining a second time t2A second point (X) representing a second position of said second interactive action2,2,Y2,2,Z2,2) And a second vector P representing the direction of the second finger2,2＝{L2,2,M2,2,N2,2}；
Acquiring a third point (X) representing a center position of the LED display screen3,Y3,Z3)；
Determining at the first time t from the first point, the first vector and the third point1If so, whether the finger of the user points to the LED display screen or not;
determining at the second time t based on the second point, the second vector and the third point2If so, whether the finger of the user points to the LED display screen or not;
when the first time t1And said second time t2When the fingers of the user point to the LED display screen, the second interaction action is analyzed to obtain an interaction control command;
if any interactive control command is not received within a first preset time after the last interactive control command is executed, exiting the user interactive control mode;
wherein, t2－t1D, becoming delta t which is a preset time discontinuity value;
is determined at a first time t1And if the finger of the user points to the LED display screen, the method specifically comprises the following steps:
substituting the first point, the first vector and the third point into the following calculation formula:
Figure FDA0002853490310000021
when the included angle alpha is smaller than the preset included angle value, the included angle alpha is determined to be at the first moment t1When the user touches the LED display screen, the finger of the user points to the LED display screen;
is determined at a second time t2And if the finger of the user points to the LED display screen, the method specifically comprises the following steps: substituting the second point, the second vector and the third point into the following calculation formula:
Figure FDA0002853490310000022
when the included angle beta is smaller than the preset included angle value, the included angle beta is determined to be at the second moment t2And when the user touches the LED display screen, the finger of the user points to the LED display screen.
2. The LED display screen playing system according to claim 1, wherein the processing of the video image data by the data processing module to obtain a linear display signal specifically comprises:
acquiring the video image data sent by the upper computer through an optical fiber;
decoding the video image data through the DVI decoding unit to obtain a decoded video signal;
copying the decoded video signal by the signal copying unit to obtain a copied decoded video signal;
the ARM chip control unit controls the first FPGA signal processing unit to convert the copied and decoded video signal into a high-speed video signal;
sending the high speed video signal to the second level controller;
and processing the high-speed video signal through the second FPGA signal processing unit of the second-level controller to obtain the linear display signal.
3. The LED display screen playing system according to claim 1, wherein the LED display screen displaying the linear display signal specifically comprises:
the LED display screen obtains the linear display signal obtained by processing the video image data through the data processing module through the network cable;
the driving chip performs gray scale control processing on the linear display signals and then sends the linear display signals to the display unit in a parallel transmission mode;
the display unit displays the linear display signal subjected to the gray scale control processing.
4. The LED display screen playing system according to claim 2, wherein the processing of the high-speed video signal by the second FPGA signal processing unit to obtain the linear display signal specifically comprises:
acquiring the high-speed video signal;
processing the high-speed video signal to obtain a high-speed video image;
extracting pixel gray values and gray levels of the high-speed video image;
converting the high-speed video image into a linear video image according to a correction conversion function;
processing the linear video image to obtain the linear display signal;
wherein the correction conversion function is:
Figure FDA0002853490310000041
wherein, POIs the gray value of the linear video image; pIThe gray value of the high-speed video image is obtained; k is a parameter for controlling the shape of the transfer function curve; a is a constant, and the larger the value of A is, the darker the overall brightness of the linear video image is; g is the gray level of the high-speed video image; g is the pixel gray value of the high-speed video image; n isgThe number of pixels of the input image with the gray value of g; x is a constant and controls the inclination of the transfer function curve; y is a constant controlling the slope and height of the transfer function curve.
5. The LED display screen playback system of claim 2, wherein said optical fiber transmits said high speed video signal to said second level controller using a serial transmission mode;
and the network cable transmits the linear display signal to the LED display screen in a serial transmission mode.
6. The LED display screen playing system according to claim 1, wherein the analyzing the second interactive action to obtain an interactive control command specifically includes:
determining the direction and the speed of the second interactive action according to the first point, the second point and the difference value between the first moment and the second moment;
when the second interaction action is performed leftwards by the user and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen retreats for a first preset time, or when the second interaction action is performed leftwards by the user and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen retreats at a first fast-backward speed;
when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to a first preset speed, the video played by the LED display screen retreats for a second preset time, or when the second interaction action is made leftward by the user and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen retreats quickly at a second quick-retreat speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than a first preset speed, the video played by the LED display screen is fast forwarded for a first preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is lower than the first preset speed, the video played by the LED display screen is fast forwarded at the first fast-forward speed;
when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen is fast-forwarded for a second preset time, or when the second interaction action is made by the user to the right and the speed of the second interaction action is greater than or equal to the first preset speed, the video played by the LED display screen is fast-forwarded at the second fast-forward speed;
when the second interaction action is made by the user upwards and the speed of the second interaction action is lower than a first preset speed, switching the video played by the LED display screen to the next video of the series in the prestored play list;
when the second interaction action is made by the user upwards and the speed of the second interaction action is greater than or equal to a first preset speed, switching the video played by the LED display screen to the next series in the prestored playlist;
when the second interaction action is made downwards by the user and the speed of the second interaction action is lower than a first preset speed, switching the video played by the LED display screen to the last video of the series in the pre-stored play list;
and when the second interaction action is performed downwards by the user and the speed of the second interaction action is greater than or equal to a first preset speed, switching the video played by the LED display screen to the last series in the prestored play list.
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