CN114866855A - Special-shaped display screen pixel data organization and transmission method - Google Patents

Special-shaped display screen pixel data organization and transmission method Download PDF

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CN114866855A
CN114866855A CN202210467721.8A CN202210467721A CN114866855A CN 114866855 A CN114866855 A CN 114866855A CN 202210467721 A CN202210467721 A CN 202210467721A CN 114866855 A CN114866855 A CN 114866855A
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data
pixel
lamp
pixel address
address
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CN114866855B (en
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张玉杰
王怡婕
詹雨涵
王帆
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Shaanxi University of Science and Technology
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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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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

Abstract

The invention belongs to the technical field of special-shaped screen display, and relates to a special-shaped display screen pixel data organization and transmission method, which comprises the following steps of firstly designing a pixel address file: designing a building elevation light distribution diagram; determining the serial relation of the lamps, and addressing the lamps; allocating port numbers; addressing pixels to obtain image pixel addresses; establishing a corresponding relation between an image pixel address and a lamp address according to the lamp address and the image pixel address of the lighting map; generating a pixel address file: the pixel address file comprises a controller parameter section and an LED lamp string pixel address section, and through establishing a lamp arrangement diagram and a pixel address file, image frame conversion and pixel data quick rearrangement and packaging are carried out, and network transmission is carried out, so that accurate video display on the special-shaped screen is realized.

Description

Special-shaped display screen pixel data organization and transmission method
Technical Field
The invention belongs to the technical field of special-shaped screen display, and particularly relates to a special-shaped display screen pixel data organization and transmission method.
Background
Along with the enlargement of landscape lighting scale, the line lamps are arranged on the vertical face of a building to form an array, and a display screen with the lamps as display units is formed.
Two different LED display screens commonly used for landscape lighting and the difference of the two different LED display screens for realizing video image display are as follows:
general LED display screen: the basic display unit of the display screen is an LED module, and LEDs are arranged in an array mode to form a rectangular display screen. In order to realize video display, the rectangular display screen is divided into a plurality of small rectangular display modules, each module consists of M × N (rows × columns) LEDs and is controlled by a receiving card, and the number of rows and columns of the LEDs of the module and the serial connection mode and sequence of the internal LEDs are fixed and unchanged. Such a screen is called a universal display screen.
LED abnormal shape display screen: the basic display unit of the display screen is an LED lamp, each lamp is composed of a plurality of LEDs arranged in a line, and the lamps are fixed on the vertical surface of a building in an array mode. Due to the limitations of building windows and balconies, the arrangement of the lamps lacks uniformity. The series relation among the lamps is determined according to the actual situation of the field, and the regularity is lacked. Such screens are known as profile screens or landscape lighting screens. The two display screens are shown in fig. 1, wherein fig. 1(a) is a structure of a general display screen and is formed by splicing 4 identical modules; fig. 1(b) is a special-shaped screen, which has 3 windows that can not be installed with lamps, the connection relationship between the LED lamps varies according to the size and position of the window, and the number and connection relationship of the lamps in each LED lamp string are different.
For a universal display screen, the structure and the serial connection of a display module are completely consistent, video images are partitioned and arranged and packaged by fixed pixel data, and the data packets are transmitted to the module through a network, so that normal video image display can be realized. For different engineering applications, the special-shaped screen has randomness due to different connection sequences and numbers of LEDs, so that pixel data cannot be packed and transmitted in a fixed mode like a general display screen, pixel data must be rearranged for each LED lamp string respectively, and then the correct display can be realized by packing and transmitting the string data.
The current LED display screen control system is designed for a general display screen, and is used for packaging decoded video images and pixel data in image blocks corresponding to modules in a fixed sequence and sending the packaged data to a module control board through a network to realize video display. However, the image data transmission method by packing the pixel points in a fixed sequence cannot realize correct video display in the special-shaped screen, and the image frame pixels are quickly recombined, packed and transmitted to form the technical bottleneck of the special-shaped screen.
Disclosure of Invention
The invention aims to provide a method for organizing and transmitting pixel data of a special-shaped display screen, which solves the problem that the correct video display cannot be realized in the special-shaped display screen in an image data transmission mode of packing the pixel data in a fixed sequence.
The invention is realized by the following technical scheme:
a method for organizing and transmitting pixel data of a special-shaped display screen comprises the following steps:
(1) design pixel address file
1.1, designing a light distribution diagram according to a building facade;
1.2, determining a lamp arrangement series connection relation, addressing a lamp to obtain a lamp address;
1.3, allocating port numbers;
1.4, pixel addressing to obtain an image pixel address;
1.5, establishing a corresponding relation between an image pixel address and a lamp address according to the lamp address and the image pixel address of the lighting map;
1.6, generating a pixel address file:
the pixel address file comprises a controller parameter section and an LED lamp string pixel address section;
(2) transmitting images
2.1, playing a video file by a player, and decoding to generate an image data frame;
2.2, transforming the image data frames to obtain RGB data of each frame of image;
2.3, sequentially reading pixel address fields of the LED lamp strings from a first pixel address field of a pixel address file in the flash;
2.4, continuously reading data from the 8 th byte of the pixel address section, taking the data as a pixel address to read pixel data from the image frame buffer area, and replacing the data corresponding to the pixel address section of the LED lamp string to form an LED lamp string data section;
2.5, packaging the LED lamp string data segment into a UDP pixel data packet, and sending the UDP pixel data packet to a controller;
2.6, repeating the steps of 2.3-2.5 until all the pixel address fields of the pixel address file are read;
and 2.7, sending a UDP (user Datagram protocol) display synchronization packet to the controller, receiving and analyzing by the controller, and sending data to the corresponding LED lamp in a serial time sequence to finish image display.
Further, step 1.1 specifically comprises: determining the width, height and lamp spacing of a building facade lamp arrangement area to complete the lamp arrangement diagram design; the lighting pattern is designed without considering the area of the building where the lights can not be distributed.
Further, step 1.2 specifically comprises: and determining the lamp arrangement series relation, representing the connection relation by using a connecting line, marking the lamp address in the figure, and not laying the lamps in the lamp arrangement incapable area.
Further, in step 1.2, fixture addressing starts with the first lamp connected, with an initial address of 1, addressing consecutively in the connection order, with a maximum programmed number of 512.
Further, step 1.3 specifically comprises: each string of lamps has a unique port number, and the port number is named in a CxPy mode, wherein x is 1-128, and y is 1-16.
Further, in step 1.6, the controller parameter section includes a function domain and a data domain;
the functional domain comprises 2 bytes of width and height of an image frame respectively, and 2 bytes of pixel address file segments;
the data field comprises a display gamma correction table of 768 bytes;
the pixel address field of the LED lamp string comprises a functional field of 7 bytes and a pixel address field of 768 bytes.
Further, S2.2 specifically includes the steps of:
(2.21) scaling transform: carrying out scaling transformation according to the width and height data provided by the pixel address file to generate an image with the size consistent with that of the lighting map;
(2.22) carrying out color space conversion on the image to obtain RGB data;
(2.23) performing display Gamma conversion on the RGB data to generate new RGB data.
Further, the UDP pixel data packet and the UDP display synchronization packet are collectively referred to as a UDP data packet, and step 2.7 specifically includes:
after receiving the UDP data packet, the controller analyzes and reads the command symbol, judges whether the UDP data packet is a UDP pixel data packet, if so, analyzes and reads the ID in the UDP data packet, and if the ID number in the UDP data packet is consistent with the ID of the controller, analyzes the data and stores the data according to the port number;
and if the UDP data packet is not the pixel data packet, judging that the UDP data packet is a UDP display synchronization packet, analyzing and sending a display synchronization control command, and sending data to each lamp of the LED lamp string in a serial time sequence to finish the display of one frame of image.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a method for organizing and transmitting pixel data of a special-shaped display screen, which is different from a universal LED display screen, and realizes accurate video display on the special-shaped display screen by establishing a light distribution diagram and a pixel address file, performing image frame conversion and fast rearrangement and packaging of pixel data and transmitting the pixel data through a network under the condition that the layout and connection relations of lamps are different for different projects; the pixel address file comprises special-shaped screen display related parameters and pixel addresses of the LED cascade strings; the pixel data packet corresponding to the LED cascade string can be quickly generated through the pixel address file and transmitted to the LED lamp through the network, so that accurate pixel transmission is realized, the purpose of accurately displaying video pictures and the like of the special-shaped screen is achieved, and the requirement of practical engineering application is met.
Drawings
FIG. 1 is a schematic view of two types of display screens currently used for landscape lighting according to the present invention;
FIG. 2 is a flow chart of the steps of the present invention;
FIG. 3 is a facade lighting diagram of the present invention;
FIG. 4 is a schematic view of a lighting communication connection of the present invention;
FIG. 5 is a diagram illustrating a packet generated by an address field of a pixel address file according to the present invention;
FIG. 6 is a block diagram of the video display and display control system of the heterogeneous display screen according to the present invention;
FIG. 7 is a flow chart of the player operation of the present invention;
FIG. 8 is a schematic diagram of a port pixel data packet generated by a pixel address field of a pixel address file according to the present invention;
fig. 9 is a flow chart of the controller operation of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the technical scheme of the invention will be clearly and completely described in the following with the embodiment of the invention, and obviously, the embodiment is only a part of the embodiment of the invention, but not all the embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2, the invention discloses a method for organizing and transmitting pixel data of a video playing and display control system of a special-shaped display screen, which comprises the following steps:
step one, designing a building elevation lamp arrangement diagram
And determining the width, height and lamp spacing of the building facade lamp arrangement area to complete the lamp arrangement design. The light distribution diagram design does not consider the window, balcony and other areas of the building where the light cannot be distributed, and as shown in fig. 3, three windows which cannot be distributed with the light are arranged in a dotted line frame.
Step two, determining the series relation of the lamps
And determining the lamp arrangement series relation, representing the connection relation by using a connecting line, and marking the lamp address in the graph, wherein the lamps in the area where the lamps cannot be arranged are not wired any more. Luminaire addressing starts with the first lamp connected, with an initial address of 1, addressing consecutively in the connection order, with a maximum programmed number 512, as shown in fig. 4.
Step three, allocating port numbers
Each string of lamps has a unique port number, and the port number is named in a CxPy mode, wherein x is 1-128, and y is 1-16.
Step four, pixel addressing
The video decoding generates continuous image frames, L-K (width-height) images with the number of lamps consistent with the lighting distribution diagram are generated through relevant transformation, the pixel points of the transformed images are addressed, the addressing is carried out in sequence from the left side of the first line to the right side, then the second line … … is carried out until the last line. As shown in fig. 5, pixel addresses are represented as boxes.
Step five, establishing the corresponding relation between the pixel address and the lamp address
Establishing a corresponding relation between a pixel address and a lamp address according to the lamp address of the lighting communication connection line diagram and the transformed image pixel address, as shown in fig. 5, the corresponding relation between the pixel address and the lamp address is shown in table 1:
table 1 is a table of correspondence between pixel addresses and lamp addresses of the present invention
Figure BDA0003625130970000061
Step six, generating a pixel address file
The pixel address file consists of controller parameter sections and LED lamp string pixel address sections, namely 1 controller parameter section and 2n pixel address sections corresponding to the LED lamp strings (n is the total designed lamp string number). The pixel address file structure is shown in table 2.
TABLE 2 Pixel Address File Structure
Figure BDA0003625130970000071
The controller parameter section is defined as:
the controller parameter section functional domain comprises 2 bytes of width and height of an image frame respectively, and 2 bytes of pixel address file sections; the data field includes a display gamma correction table of 768 bytes. The controller parameters section has a total of 775 bytes.
The LED lamp string pixel address field is defined as:
first, the address segment length is fixed 775byte, which includes a functional domain of 7 bytes and a pixel address domain of 768 bytes;
second, the definition of the function domain is shown in table 3, wherein the command symbol indicates that the segment is the pixel address segment of the LED string; the controller ID and the port number respectively correspond to a controller address and a controller port number; the number of lamps indicates the number of lamps connected with the ports of the controller, and the LED driving type indicates the type of the used lamp bead driver.
TABLE 3 functional Domain definitions defined by
Command identifier Controller ID Port number Port packet number Number of lamps LED drive type
1byte 1byte 1byte 1byte 2byte 1byte
The maximum number of lamps allowed to be accessed to each port is 512, the corresponding pixel data is 1536 bytes, UDP is used for sending, and since the maximum number of UDP packets is 1472 bytes, when the number of lamps of one port exceeds 256, the port data is divided into two UDP packets to be sent. Therefore, the port packet numbers are added in the functional domain, and take the values of 00010001B and 00100010B.
And the data field is defined as the pixel point addresses corresponding to the lamp strings connected by the ports in sequence, and the data field has 768 bytes. Each port corresponds to two data fields, the port packet number 00010001B corresponds to the first 256 lamps, and the port packet number 00100010B corresponds to the last 256 lamps. The number of lamps connected to one port is less than 512, and the data field is filled with FF.
As shown in fig. 7, the player workflow is:
(1) the player reads in a pixel address file and stores the pixel address file in flash;
(2) the player plays the video file and generates an image data frame after decoding;
(3) scaling transformation: scaling and converting according to the width and the height provided by the pixel address file to generate an image with the same size as the lighting diagram;
(4) performing color space conversion on the image to obtain RGB data;
(5) performing display Gamma conversion on the image RGB data to generate new RGB data;
(6) reading a first LED lamp string pixel address field from the flash;
(7) as shown in fig. 8, data is continuously read from the 8 th byte of the pixel address field, and the pixel data is read from the image frame buffer using the data as the pixel address, replacing the data corresponding to the pixel address field, to form the LED light string data field;
e.g., port number C as shown in FIG. 8 1 P 1 The corresponding pixel address segment 00000000000100000200000300000400000500000600000700000800000900000a00000b00000c00000d00000e00000f00001000001100001200001300001400001500001600001700001800001900001a00001b00001c00001d00001e00001f00002000002100002200002300002400002500002600002700002800002900002a00002b00002c00002d00002e00002f 000030000031000032033 is replaced by 585657c9c9c9Ff6305Ff6305Ff 6204Ff6204Ff6203Ff6203Ff6203Ff6102Ff6101Ff6000Ff6000Ff6203Ff6203Ff6000ffebdfe 6000ffe 0b3b29a0504Ff6102Ff6000Ff 60009a05049a0504 b 0504Ff6203Ff6203 a0504Ff6000Ff6000Ff 6006000 Ff 09a0504 b 0504 dfdfdfb 3b2 ffedbdff 9a0504ffeb 3b 2b 3b 3873 b 6000 ffb 6203 b 6000 ffb 3b 6000 ffbff 6000 dfffe 9a0504 ffffe 3b 6203 b.
(8) The segment is packetized into UDP pixel packets and sent over the gigabit network to the controller. And (6) repeating the steps (6) to (7) until all the UDP pixel data packets corresponding to the segments are sent.
(9) And sending a UDP (user Datagram protocol) display synchronization packet to the controller, receiving and analyzing by the controller, and sending data to the corresponding LED lamp in a serial time sequence to finish image display.
The UDP pixel data packet and the UDP display synchronization packet are collectively referred to as a UDP data packet, and as shown in fig. 9, the controller has a workflow:
after receiving the UDP data packet, the controller analyzes and reads the command symbol, judges whether the UDP data packet is a UDP pixel data packet, if so, analyzes and reads the ID in the UDP data packet, and if the ID number in the UDP data packet is consistent with the ID of the controller, analyzes the data and stores the data according to the port number;
and if the UDP data packet is not the pixel data packet, judging that the UDP data packet is a UDP display synchronization packet, analyzing and sending a display synchronization control command, and sending data to each lamp of the LED lamp string in a serial time sequence to complete the display of one frame of image.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, the changes, modifications, substitutions and alterations all falling within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A method for organizing and transmitting pixel data of a special-shaped display screen is characterized by comprising the following steps:
(1) design pixel address file
1.1, designing a light distribution diagram according to a building facade;
1.2, determining a lamp arrangement series connection relation, and addressing a lamp to obtain a lamp address;
1.3, allocating port numbers;
1.4, pixel addressing to obtain an image pixel address;
1.5, establishing a corresponding relation between an image pixel address and a lamp address according to the lamp address and the image pixel address of the lighting map;
1.6, generating a pixel address file:
the pixel address file comprises a controller parameter section and an LED lamp string pixel address section;
(2) transmitting images
2.1, playing a video file by a player, and decoding to generate an image data frame;
2.2, transforming the image data frames to obtain RGB data of each frame of image;
2.3, sequentially reading pixel address fields of the LED lamp strings from a first pixel address field of a pixel address file in the flash;
2.4, continuously reading data from the 8 th byte of the pixel address section, taking the data as a pixel address to read pixel data from the image frame buffer area, and replacing the data corresponding to the pixel address section of the LED lamp string to form an LED lamp string data section;
2.5, packaging the LED lamp string data segment into a UDP pixel data packet, and sending the UDP pixel data packet to a controller;
2.6, repeating the steps of 2.3-2.5 until all the pixel address fields of the pixel address file are read;
and 2.7, sending a UDP (user Datagram protocol) display synchronization packet to the controller, receiving and analyzing by the controller, and sending data to the corresponding LED lamp in a serial time sequence to finish image display.
2. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein the step 1.1 specifically comprises: determining the width, height and lamp spacing of a building facade lamp arrangement area to complete the lamp arrangement diagram design; the lighting pattern is designed without considering the area of the building where the lights can not be distributed.
3. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein the step 1.2 specifically comprises: and determining the lamp arrangement series relation, representing the connection relation by using a connecting line, marking the lamp address in the figure, and not laying the lamps in the lamp arrangement incapable area.
4. A method according to claim 1, wherein in step 1.2, the lamp addressing starts with the first lamp connected, the initial address is 1, the addressing is continued in the connection order, and the maximum programming number is 512.
5. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein the step 1.3 specifically comprises: each string of lamps has a unique port number, and the port number is named in a CxPy mode, wherein x is 1-128, and y is 1-16.
6. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein in step 1.6, the controller parameter section comprises a functional field and a data field;
the functional domain comprises 2 bytes of width and height of an image frame respectively, and 2 bytes of pixel address file segments;
the data field comprises a display gamma correction table of 768 bytes;
the pixel address field of the LED lamp string comprises a functional field of 7 bytes and a pixel address field of 768 bytes.
7. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein S2.2 specifically comprises the following steps:
(2.21) scaling transform: carrying out scaling transformation according to the width and height data provided by the pixel address file to generate an image with the size consistent with that of the lighting map;
(2.22) carrying out color space conversion on the image to obtain RGB data;
(2.23) performing display Gamma conversion on the RGB data to generate new RGB data.
8. The method for organizing and transmitting pixel data of a heterogeneous display screen according to claim 1, wherein UDP pixel data packets and UDP display synchronization packets are collectively referred to as UDP data packets, and the step 2.7 specifically comprises:
after receiving the UDP data packet, the controller analyzes and reads the command symbol, judges whether the UDP data packet is a UDP pixel data packet, if so, analyzes and reads the ID in the UDP data packet, and if the ID number in the UDP data packet is consistent with the ID of the controller, analyzes the data and stores the data according to the port number;
and if the UDP data packet is not the pixel data packet, judging that the UDP data packet is a UDP display synchronization packet, analyzing and sending a display synchronization control command, and sending data to each lamp of the LED lamp string in a serial time sequence to finish the display of one frame of image.
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