CN113923380B - Multipath video processing switcher and measuring method thereof - Google Patents
Multipath video processing switcher and measuring method thereof Download PDFInfo
- Publication number
- CN113923380B CN113923380B CN202111185028.3A CN202111185028A CN113923380B CN 113923380 B CN113923380 B CN 113923380B CN 202111185028 A CN202111185028 A CN 202111185028A CN 113923380 B CN113923380 B CN 113923380B
- Authority
- CN
- China
- Prior art keywords
- module
- video
- data
- channel
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
-
- 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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/23418—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics
-
- 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
- H04N21/44008—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 operations for analysing video streams, e.g. detecting features or characteristics in the video stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Studio Circuits (AREA)
Abstract
The invention discloses a multi-channel video processing switcher and a measuring method thereof, wherein the multi-channel video processing switcher comprises a channel detection module, an LED control display module, a key analysis module, a function selection module, a switching control module, an AD8175 control module, an AD9984 control module, a video data acquisition module, a DDR3 control module, a multi-screen display module, a character generation and addition module, a 4-edge 8 mode correction module and a video output module. The invention can realize any seamless switching output display among multiple input sources, realize video fusion processing of the multiple input sources, and realize trapezoid correction operation of '4 sides 8 modes' on the output video stream.
Description
Technical Field
The invention relates to the technical field of high-definition digital video signal processing and the technical field of high-speed signal exchange, in particular to a multipath video processing switcher and a measuring method thereof.
Background
Video is an important carrier of visual information, accounting for about 70% of the total information acquired by people, and the importance of the video is increasing. With the development of high-definition digital video processing technology and high-speed signal exchange technology and the improvement of life quality of people, the requirements of people on visual effects are higher. The video processing equipment used with the laser projector has more and more functional requirements; at present, no high-performance and multifunctional integrated device capable of realizing any seamless switching of output display among multiple input sources, video fusion processing of the multiple input sources and trapezoid correction operation of '4-side 8 modes' on an output video stream is available.
Disclosure of Invention
The first object of the present invention is to provide a multi-channel video processing switcher, which can realize any seamless switching of output display among multi-channel input sources, realize video fusion processing of the multi-channel input sources, and realize trapezoid correction operation of '4 sides 8 modes' on output video streams.
A second object of the present invention is to provide a method for measuring a multi-channel video processing switch.
The first object of the present invention is achieved by:
a multipath video processing switcher is characterized in that: comprising the following steps:
the channel detection module: the channel detection module is used for detecting the state of an input video source of each input channel;
LED control display module: the LED control display module is used for indicating the video source access state of the input channel by the LED;
the key analysis module: the key analysis module is used for analyzing key operation on the key circuit board;
function selection module: the function selection module is used for selecting corresponding video processing operation;
and a switching control module: the switching control module is used for converting switching data into control signals required by the operation of the AD8175 control module;
the AD8175 control module is used for controlling the analog cross point switch AD8175 to perform gating operation of an input channel and an output channel;
the AD9984 control module is used for configuring an analog-to-digital conversion chip AD9984 and converting the analog video signal into a required digital video signal;
the video data acquisition module is used for carrying out data acquisition and effective data extraction operation on video signals with different resolutions;
the DDR3 control module is used for simultaneously writing and reading the multi-path video stream data;
the multi-screen display module is used for carrying out one-screen display on the multiple paths of input video sources according to the selected split-screen function;
the character generation and addition module is used for adding OSD characters at any position in the output video source;
the correction module of the 4-side 8 modes is used for carrying out multi-angle and high-precision trapezoidal correction operation on the video source;
the video output module is used for outputting and displaying the effective video data according to a video output and display time sequence and a protocol;
the working flow of the multipath video processing switcher is as follows: the input channel of the 8-channel VGA interface is connected to the channel detection module, and the channel detection module transmits information for detecting the video access state of the input channel to the LED control display module, so that the corresponding video source input state is indicated by controlling the on and off of the LED; meanwhile, the input channels of the 8 VGA interfaces are respectively connected to the 8 input channels of the AD8175 control module, and the AD8175 control module controls any one of the 4 output signals communicated with the 8 input channels to output; the other 4 paths of videos output by the AD8175 control module are respectively connected with the 4 paths of AD9984 control modules, and the AD9984 control module converts the analog video signals into digital video signals according to the configuration conditions; the video data acquisition module acquires 4 paths of signals converted into digital video at the same time, and under the action of the DDR3 control module, the 4 paths of video data are stored into DDR3 for caching and are read out from the DDR 3; according to the selection of the realization function analyzed by the key analysis module, seamless switching operation, multi-split screen operation, trapezoid correction operation in 4-edge 8 modes and character adding operation are carried out on the read video stream data, and video signals processed by a digital video algorithm are output and displayed.
Further, the channel detection module is configured to: and carrying out signal judgment processing operation on the line synchronizing signals HS and the field synchronizing signals VS in the 8 paths of video input channels, extracting state information of each channel after the processing judgment, combining and converting the state information into a data form required by a subsequent module through data, and then transmitting the data to the LED control display module according to fixed time.
Further, the LED control display module is configured to: capturing the rising edge of the indication trigger signal transmitted by the channel detection module, collecting the data transmitted by the channel detection module when the rising edge is captured, analyzing the collected data, comparing and judging the analyzed data with the data analyzed last time, if the data does not change, not performing subsequent operation, and if the data changes, performing operation of changing the display state on the LEDs of the corresponding channels by the LED state control module according to the obtained data.
Further, the key parsing module is configured to: and (3) performing delay debouncing operation on signals input by the keys, capturing the input row signals and the input column signals, performing data decoding operation according to the captured row signals and the captured column signals, performing data analysis and classification on the decoded data, performing classification and extraction on correction information, switching information and functional information by a data analysis and classification module, and transmitting the correction information, the switching information and the functional information to a corresponding module for operation.
Further, the function selection module is configured to: the data analyzed by the key analysis module is collected, function selection information in the data is analyzed, and the function distribution module carries out corresponding enabling and disabling operations on switching operation, split screen operation, character operation and correction operation in the '4-edge 8 modes' according to the acquired function selection information.
Further, the switching control module is configured to: when capturing the effective trigger signal rising edge of the switching channel data, collecting the switching channel data, analyzing the input and output channel information, converting the input and output channel serial numbers, and transmitting the converted input and output channel serial numbers to the AD8175 control module.
Further, the AD8175 control module is configured to: the AD8175 is configured, the initialization setting is carried out on the gating and enabling of each input channel and each output channel of the AD8175 after the configuration is completed, and after the configuration initialization is completed; when the control module captures the rising edge of the effective indication signal of the input channel data or the output channel data, the relevant data are read, the data are sent to the AD8175 through the AD8175 time sequence generating module to carry out corresponding operation, the gating states of the input channel and the output channel are changed, and corresponding channel switching operation is realized.
Further, the AD9984 control module is configured to: the method comprises the steps of initializing and configuring 4 AD9984 chips, detecting real-time resolutions of video streams input into the 4 AD9984 chips, judging whether the detected resolutions of the video streams are consistent with the configuration, and if the detected resolutions are inconsistent, modifying the corresponding configurations of the AD9984 chips according to the detected resolutions by an operation control module, so that the effect of self-adaption of the resolutions of the input video streams is achieved.
Further, the video data acquisition module is used for: VS and HS signals of an input video signal in an input channel are collected, effective time of the VS and HS is calculated, resolution of a current input video stream is analyzed by duration time, then parameter values of the video protocol under the current resolution are determined, effective data of the video stream are analyzed and extracted from video stream data according to the determined parameters, and pixels with 10bit width are converted into pixels with 8bit width, and the pixels are transmitted to the next module together with the generated DE, VS and HS signals to be stored.
Further, the DDR3 control module is to: the method comprises the steps that 4 paths of video stream data acquired by a video acquisition module are combined into 128-bit data through a video data processing module in a DDR3 control module, firstly, the 4 paths of video streams after conversion are subjected to synchronous operation through a FIFO buffer memory operation and then through a data acquisition synchronous module, under the action of a DDR3 write control module, the 4 paths of video streams are written into a DDR3 chip to be subjected to buffer memory operation, meanwhile, the DDR3 read control module carries out different modes of reading operation on the data according to the specific conditions of a switching module and a function selection module, then the 4 paths of read data are subjected to corresponding data distribution and combination according to the switching module and the function selection module, and 4 paths of needed new video stream data are generated and transmitted to a next module to be subjected to processing operation.
Further, the multi-screen display module is used for: the function control signal generated by the function selection module acts on the channel time-sharing gating module and the data processing combination module in the multi-screen display module, the channel time-sharing gating module is in a 1-4 channel selected state according to the function control signal time-sharing selection, the data processing combination module selectively reads 4 channel data according to requirements according to the function control signal, and the 4 channel data are combined and then transmitted to the new video stream generation module to generate new video data streams to be transmitted to the next module for use.
Further, the character generation and addition module is used for: the method comprises the steps of collecting video data streams generated by a multi-screen display module, selecting and reading characters and adding conditions of the characters according to function control signals, determining initial positions of the characters in a video by X-axis input data and Y-axis input data, inserting the characters into required positions by a data insertion combination module, combining the bytes required to be added into new data, and transmitting the new data to a new video stream generation module for the next module to use.
Further, the "4-sided 8-mode" correction module is configured to: when the correction function of the '4 sides 8 modes' is selected, the selection value of the '4 sides', the selection value of the correction direction and the correction magnitude are obtained, and input control signals required by the operation of the UV address generation module are generated through the values and used for controlling the UV address generation module to perform space coordinate conversion operation and converting the space coordinate values into address values of DDR3 read data. The UV address generating module in the correcting module in the 4-side 8 modes generates 2 paths of information of read data of mutually staggered rows, 2 paths of signals are operated simultaneously, the total data number and interval data number information are extracted from the read data information, meanwhile, the data read out through a new address is cached by using the FIFO, and then the required pixel information is read out from the FIFO according to the values of the extracted total data number and interval data number. The 2 paths of processing channels simultaneously perform the operations, perform interpolation operation according to a video stream output protocol, and finally perform output.
Further, the video output module is configured to: firstly, acquiring resolution information, determining the value of each parameter in a video protocol generation time sequence according to the acquired resolution information, generating video indication signals VS, HS and DE according to the video protocol time sequence under the determined parameter value, and synchronously generating output video streams.
The second object of the present invention is achieved by:
a measuring method of a multipath video processing switcher is characterized in that: comprising the following steps:
step one, a channel detection module detects the state of an input video source of each input channel, an LED control display module indicates the video source access state of the input channel by controlling an LED, an AD8175 control module performs configuration and initialization operation on AD8175, and an AD9984 control module performs configuration and initialization operation on AD 9984;
step two, the key analysis module analyzes the operation information on the key circuit board, the function selection module selects corresponding video processing operation according to the operation information, the switching control module controls gating of an input channel and an output channel of the analog cross point switch AD8175, and the analog video signal is converted into a digital video signal through the AD9984 control module;
step three, the video data acquisition module performs data acquisition and effective data extraction operation on video signals with different resolutions, the acquired multipath video stream data is written into DDR3 for caching under the action of the DDR3 control module, and the cached video stream data is read from DDR3 according to video output time sequence;
step four, the multi-screen display module carries out split-screen algorithm processing on the multi-path video stream data read from the DDR3 to realize split-screen operation of full screen, two split screens, four split screens, five split screens and picture-in-picture, and the video stream data after the split-screen operation is transmitted to the character generation and addition module to carry out character addition operation;
step five, reading the characters from the ROM storing the characters, inserting the read characters at the appointed video stream position, adding character data, combining the character data into new video stream data, and transmitting the new video stream data to a correction module of 4 sides and 8 modes for use;
step six, the correction module of the '4-side 8 modes' carries out multi-angle and high-precision trapezoidal correction operation on the video source, the processed video stream is transmitted to the video output module, and the video output module outputs and displays the received video stream data according to the video output display time sequence and protocol.
The invention has the beneficial effects that: the invention is that the input channel of the 8-channel VGA interface is connected to the channel detection module, the channel detection module transmits the information for detecting the video access state of the input channel to the LED control display module, and then indicates the input state of the corresponding video source by controlling the on and off of the LED; meanwhile, the input channels of the 8 VGA interfaces are respectively connected to the 8 input channels of the AD8175 control module, and the AD8175 control module controls any one of the 4 output signals communicated with the 8 input channels to output; the other 4 paths of videos output by the AD8175 control module are respectively connected with the 4 paths of AD9984 control modules, and the AD9984 control module converts the analog video signals into digital video signals according to the configuration conditions; the video data acquisition module acquires 4 paths of signals converted into digital video at the same time, and under the action of the DDR3 control module, the 4 paths of video data are stored into DDR3 for caching and are read out from the DDR 3; according to the selection of the realization function analyzed by the key analysis module, seamless switching operation, multi-split screen operation, trapezoid correction operation in 4-edge 8 modes and character adding operation are carried out on the read video stream data, and video signals processed by a digital video algorithm are output and displayed.
The invention can realize any seamless switching output display among multiple input sources, realize video fusion processing of the multiple input sources, and realize trapezoid correction operation of '4 sides 8 modes' on the output video stream.
Drawings
FIG. 1 is a system flow diagram of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 2 is a block diagram of a channel detection module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 3 is a block diagram of an LED control display module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 4 is a block diagram of a key resolution module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 5 is a block diagram of a function selection module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 6 is a block diagram of a switch control module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 7 is a block diagram of the AD8175 control module of the multi-channel video processing switch according to an embodiment of the present invention;
FIG. 8 is a block diagram of an AD9984 control module of a multi-channel video processing switch in accordance with an embodiment of the invention;
FIG. 9 is a block diagram of a video data acquisition module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 10 is a block diagram of a DDR3 control module of a multiple video processing switch according to an embodiment of the invention;
FIG. 11 is a block diagram of a multi-screen display module of a multi-channel video processing switch according to an embodiment of the present invention;
FIG. 12 is a block diagram of a character generation add module of a multi-way video processing switch according to an embodiment of the invention;
FIG. 13 is a block diagram of a "4-sided 8-mode" correction module for a multiple video processing switch according to an embodiment of the present invention;
FIG. 14 is a block diagram of a video output module of a multi-channel video processing switch according to an embodiment of the invention;
in the figure: 1. a channel detection module; 2. an LED control display module; 3. a key analysis module; 4. a function selection module; 5. a switching control module; 6. an AD8175 control module; 7. an AD9984 control module; 8. a video data acquisition module; 9. DDR3 control module; 10. a multi-screen display module; 11. a character generation and addition module; 12. the correction module is in a 4-side 8-mode; 13. and a video output module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
As shown in fig. 1 to 14, the multi-path video processing switcher according to the embodiment of the present invention includes a channel detection module 1, an LED control display module 2, a key analysis module 3, a function selection module 4, a switching control module 5, an AD8175 control module 6, an AD9984 control module 7, a video data acquisition module 8, a DDR3 control module 9, a multi-screen display module 10, a character generation adding module 11, a "4-edge 8 mode" correction module 12, and a video output module 13, wherein:
the channel detection module 1 is used for: the method comprises the steps that a field synchronization signal VS and a line synchronization signal HS of an 8-channel input channel are directly connected to a VS/HS signal judging and processing module, the VS/HS signal judging and processing module captures rising edges of VS signals of the 8-channel input channel, rising edges of the VS signals of a certain channel can be always captured within 20ms, the channel is indicated to have video signal access, similar capturing VS operation is performed on other 7-channel input channels, and data of detected state information of video sources input by the 8-channel input channel are transmitted to a channel state generating module; the data generated by the channel state generating module is transmitted to the data combination converting module to carry out data combination operation, and input channel state information is generated; the data timing transmission module sends the state information of the input channel to the LED control display module 2 every 1s to display the state of the input channel;
the LED control display module 2 is used for: the trigger signal identification module captures the rising edge of the data indication signal output by the channel detection module 1, when the rising edge is captured, the data sent by the channel detection module 1 is acquired, the data acquisition analysis module analyzes the acquired data, the data comparison judgment module compares the analyzed data with the data analyzed last time, if the two data are the same, the channel access state is not changed, and the state change operation of the LED lamp is not performed; the two results are different, and an LED state control module in the LED control display module correspondingly changes the LED display states of the corresponding 8 paths of input channels according to the acquired data;
the key analysis module 3 is used for: the key signal debouncing module performs delay capturing debouncing operation on signals input by keys, the capturing row and column signal module detects input row and column signals, the data decoding module performs data decoding operation according to the captured row and column signals, the decoded data is transmitted to the data analysis and classification module, the data analysis and classification module extracts data with different lengths according to different functions, and the extracted selection value of 4 sides of the 4 sides in 8 modes, the selection value of correction direction and the correction magnitude are transmitted to the 4 sides in 8 modes for use; the extracted information of the switching input channel serial number and the output channel serial number is transmitted to a switching control module for use; the extracted switching function, the multi-screen display function and the correction function information of the 4-side 8 modes are transmitted to a function selection module for use;
the function selection module 4 is used for: the data acquisition module captures the rising edge of the function information indication signal output by the key analysis module, when the rising edge is captured, the function information data output by the key analysis module is acquired, the data analysis module extracts the function selection information in the data, and the function distribution module correspondingly enables or disables the switching operation, the split screen operation, the character operation and the correction operation in the '4-edge 8 modes' according to the acquired function selection information; generating a series of control signals of switching operation, split screen operation, character operation and correction operation of '4 sides 8 modes', and controlling the corresponding modules;
the switching control module 5 is used for: the switching data acquisition module captures the rising edge of the switching operation indication signal output by the function selection module, acquires the data output by the key analysis module at the moment, the data analysis module analyzes the effective data, extracts the input channel data and the output channel data for extraction operation, the channel sequence number conversion module converts the values of the input channel and the output channel, and the channel information transmission module transmits the converted input channel information and output channel information to the AD8175 control module 6 for use;
the AD8175 control module 6 is configured to: after the multi-channel video processing switcher is powered on, an AD8175 module is configured to configure the AD8175, and the data operation is set to be in a parallel mode; the initialization AD8175 module performs initialization operation on the AD8175, enables the first 8 input channels, and designates states of the 8 input channels and the output channels; the control module captures a switching indication signal, when the rising edge of the signal is captured, the control module acquires input channel data and output channel data, the control module converts the acquired data into a data format which can be operated by the AD8175 time sequence generating module, the converted data is transmitted to the AD8175 time sequence generating module to generate a time sequence signal meeting the AD8175 operation, and the states of the corresponding input channel and output channel are changed, so that the switching operation is realized;
the AD9984 control module 7 is for: after the multi-channel video processing switcher is powered on, the AD9984 configuration module simultaneously carries out relevant parameter configuration on the AD9984 chip of the 4-channel analog-to-digital converter; after configuration is completed, the detection resolution module detects the real-time resolution values of the video streams of the 4 AD9984, transmits the data of the 4 paths of resolution to the operation control module for data conversion and data comparison operation, judges whether the resolution of the video stream of the input channel is consistent with the resolution set by the AD9984 chip of the channel currently arranged, if not, the operation control module converts the data information of the resolution currently detected into data identifiable by a register and transmits the data to the AD9984 configuration change module for changing the resolution of the corresponding channel, thereby realizing the self-adaptive function operation of the input video;
the video data acquisition module 8 is used for: the method comprises the steps that rising edges of a signal HS and a signal VS are collected by a HS and VS signal module, after the rising edges of the signal HS are captured, video resolution of a video stream of a channel is determined by a resolution module through judging high-level duration time of the HS, resolution information of the detected video stream is determined, and relevant parameters of a video protocol are determined according to the resolution of the detected video stream; collecting video data according to the determined parameter value of the channel video protocol, and analyzing and extracting the collected video stream data into effective data; converting the pixel point width of the extracted video data from 10 bits to 8 bits; generating VS, HS and DE signals and transmitting the signals to the following modules for collection;
the DDR3 control module 9 is for: the method comprises the steps that VS, HS, DE and RGB signals generated by a video acquisition module are input into a video data processing module in a DDR3 control module, the video data processing module extracts effective data of 4 paths of video streams according to the time sequence of the VS, the HS and the DE, data bit conversion and caching operation are carried out through a FIFO, the input 32bit data are combined into 128bit data, the converted data are stored in the FIFO, a data acquisition synchronization module reads the video data stored in the FIFO in 4 paths by utilizing a homologous clock of the DDR3 write control module, synchronization operation of the video data is achieved, and the DDR3 write control module stores the video data synchronized by 4 channels in the DDR3 in a time-sharing manner; meanwhile, a function selection module in the DDR3 control module monitors a function information indication signal, acquires function information data when capturing the rising edge of the signal, and performs 4 paths of video data reading operation on the DDR3 according to a video stream protocol when the function is selected as a switching operation; when the function is selected as a split screen module, the DDR3 read control module performs time-sharing cross read operation on the 4 paths of video data according to the split screen selection; when the function is selected as the correction operation of '4 sides and 8 modes', the DDR3 read control module carries out the data reading operation of the staggered parallel rows on one path of video data; reading DDR3 data, performing operation through a data distribution combination module, storing the read 128-bit data into a FIFO (first in first out) for bit width conversion and caching operation, reading 32-bit data in the FIFO, and generating 4 paths of video stream data for the next module to perform operation;
the multi-screen display module 10 is used for: the function selection module generates a full screen function, a two-screen function, a four-screen function, a five-screen function and a picture-in-picture function control signal group, the control signals act on a channel time-sharing gating module and a data processing combination module in the multi-screen display module, the channel time-sharing gating module selects 1-4 channel gating states in a time-sharing mode according to the states of the function control signals, the data processing combination module selectively reads 4 channel data according to the demands according to the states of the function control signals, and the 4 channel data are transmitted to the new video stream generation module to generate new video data streams for transmission to the next module for use after combination;
the character generation adding module 11 is configured to: the video data acquisition module acquires a video data input signal; the data insertion combination module detects a function control signal, and selects reading characters and adding conditions of the characters according to the state of the detection control signal; capturing the rising edge of a coordinate change indication signal, and collecting X-axis input data and Y-axis input data, wherein the two data determine the initial coordinate position of a character in a video stream coordinate system; the character reading and adding module reads characters from ROM for storing characters, then the data insertion and combination module performs character insertion operation on bytes needing to be added at a required position, character data are added and then combined into new video stream data, and the new video stream data are transmitted to the new video stream generating module for the next module to use;
the "4-sided 8-way" correction module 12 is used to: when the correction function of the '4 sides 8 modes' is selected, the correction value acquisition module acquires the selection value of the '4 sides', the selection value of the correction direction and the correction value, and the generation control signal module converts the parameter values into control signals which control the operation of the space coordinate change of the UV address generation module and the generation of the read data address; the UV address generation module converts the video stream space coordinate into correction space coordinate operation, and further converts the converted correction space coordinate value into an address value of DDR3 read data; the UV address generation module generates DDR3 address values for reading 2 paths of mutually staggered row video stream data, and simultaneously carries out the following operations on the 2 paths: the information of total data number and interval data number in one line of data information in the extracted video stream is obtained, and data read out from DDR3 according to the changed address is subjected to FIFO buffer memory, and the number of the read data and the secondary value of address accumulation are counted; reading the cached video stream data from the FIFO, and selectively reserving according to the extracted total data number and the value of the interval data number; interpolation operation is carried out on the last effective video stream data obtained in the 2 paths according to a video stream output protocol, and the video stream data of a complete frame is combined and output;
the video output module 13 is configured to: the resolution information acquisition module acquires resolution information of the output video stream and acquires the resolution information according to the acquired resolution information; determining the values of parameters such as total pixel points, effective pixel points, total line numbers, effective line numbers, blanking time and the like in a video protocol generation time sequence; the video data acquisition module generates video indication signals VS, HS and DE according to the determined parameters and video protocol time sequence, and synchronously generates video streams of the video protocol for output and display.
In order to facilitate understanding of the above technical solutions of the present invention, the following describes the above technical solutions of the present invention in detail by a specific usage manner.
In specific use, the multi-channel video processing switcher according to the present invention, the measurement method thereof further comprises:
step one, a channel detection module detects the state of an input video source of each input channel, an LED control display module indicates the video source access state of the input channel by controlling an LED, an AD8175 control module performs configuration and initialization operation on AD8175, and an AD9984 control module performs configuration and initialization operation on AD 9984;
step two, the key analysis module analyzes the operation information on the key circuit board, the function selection module selects corresponding video processing operation according to the operation information, the switching control module controls gating of an input channel and an output channel of the analog cross point switch AD8175, and the analog video signal is converted into a digital video signal through the AD9984 control module;
step three, the video data acquisition module performs data acquisition and effective data extraction operation on video signals with different resolutions, the acquired multipath video stream data is written into DDR3 for caching under the action of the DDR3 control module, and the cached video stream data is read from DDR3 according to video output time sequence;
step four, the multi-screen display module carries out split-screen algorithm processing on the multi-path video stream data read from the DDR3 to realize split-screen operation of full screen, two split screens, four split screens, five split screens and picture-in-picture, and the video stream data after the split-screen operation is transmitted to the character generation and addition module to carry out character addition operation;
step five, reading the characters from the ROM storing the characters, inserting the read characters at the appointed video stream position, adding character data, combining the character data into new video stream data, and transmitting the new video stream data to a correction module of 4 sides and 8 modes for use;
step six, the correction module of the '4-side 8 modes' carries out multi-angle and high-precision trapezoidal correction operation on the video source, the processed video stream is transmitted to the video output module, and the video output module outputs and displays the received video stream data according to the video output display time sequence and protocol.
In summary, by means of the above technical solution of the present invention, an input channel of an 8-channel VGA interface is connected to a channel detection module, and the channel detection module transmits information for detecting a video access state of the input channel to an LED control display module, so as to indicate a corresponding video source input state by controlling on/off of an LED; meanwhile, the input channels of the 8 VGA interfaces are respectively connected to the 8 input channels of the AD8175 control module, and the AD8175 control module controls any one of the 4 output signals communicated with the 8 input channels to output; the other 4 paths of videos output by the AD8175 control module are respectively connected with the 4 paths of AD9984 control modules, and the AD9984 control module converts the analog video signals into digital video signals according to the configuration conditions; the video data acquisition module acquires 4 paths of signals converted into digital video at the same time, and under the action of the DDR3 control module, the 4 paths of video data are stored into DDR3 for caching and are read out from the DDR 3; according to the selection of the realization function analyzed by the key analysis module, seamless switching operation, multi-split screen operation, trapezoid correction operation in 4-edge 8 modes and character adding operation are carried out on the read video stream data, and video signals processed by a digital video algorithm are output and displayed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A multipath video processing switcher comprises an LED control display module, a key analysis module and a video output module, wherein: LED control display module: the LED control display module is used for indicating the video source access state of the input channel by the LED; the key analysis module: the key analysis module is used for analyzing key operation on the key circuit board; the video output module is used for outputting and displaying the effective video data according to a video output and display time sequence and a protocol; the method is characterized in that: further comprises:
the channel detection module: the channel detection module is used for detecting the state of an input video source of each input channel;
function selection module: the function selection module is used for selecting corresponding video processing operation;
and a switching control module: the switching control module is used for converting switching data into control signals required by the operation of the AD8175 control module;
the AD8175 control module is used for controlling the analog cross point switch AD8175 to perform gating operation of an input channel and an output channel;
the AD9984 control module is used for configuring an analog-to-digital conversion chip AD9984 and converting the analog video signal into a required digital video signal;
the video data acquisition module is used for carrying out data acquisition and effective data extraction operation on video signals with different resolutions;
the DDR3 control module is used for simultaneously writing and reading the multi-path video stream data;
the multi-screen display module is used for carrying out one-screen display on the multiple paths of input video sources according to the selected split-screen function;
the character generation and addition module is used for adding OSD characters at any position in the output video source;
the correction module of the 4-side 8 modes is used for carrying out multi-angle and high-precision trapezoidal correction operation on the video source;
the input channel of the 8-channel VGA interface is connected to the channel detection module, and the channel detection module transmits information for detecting the video access state of the input channel to the LED control display module, so that the corresponding video source input state is indicated by controlling the on and off of the LED; meanwhile, the input channels of the 8 VGA interfaces are respectively connected to the 8 input channels of the AD8175 control module, and the AD8175 control module controls any one of the 4 output signals communicated with the 8 input channels to output; the other 4 paths of videos output by the AD8175 control module are respectively connected with the 4 paths of AD9984 control modules, and the AD9984 control module converts the analog video signals into digital video signals according to the configuration conditions; the video data acquisition module acquires 4 paths of signals converted into digital video at the same time, and under the action of the DDR3 control module, the 4 paths of video data are stored into DDR3 for caching and are read out from the DDR 3; according to the selection of the realization function analyzed by the key analysis module, seamless switching operation, multi-split screen operation, trapezoid correction operation in 4-edge 8 modes and character adding operation are carried out on the read video stream data, and video signals processed by a digital video algorithm are output and displayed.
2. The multi-way video processing switcher of claim 1, wherein: the channel detection module is used for: and carrying out signal judgment processing operation on the line synchronizing signals HS and the field synchronizing signals VS in the 8 paths of video input channels, extracting state information of each channel after the processing judgment, combining and converting the state information into a data form required by a subsequent module through data, and then transmitting the data to the LED control display module according to fixed time.
3. The multi-way video processing switcher of claim 1, wherein: the function selection module is used for: the data analyzed by the key analysis module is collected, function selection information in the data is analyzed, and the function distribution module carries out corresponding enabling and disabling operations on switching operation, split screen operation, character operation and correction operation in the '4-edge 8 modes' according to the acquired function selection information.
4. The multi-way video processing switcher of claim 1, wherein: the switching control module is used for: when capturing the effective trigger signal rising edge of the switching channel data, collecting the switching channel data, analyzing the input and output channel information, converting the input and output channel serial numbers, and transmitting the converted input and output channel serial numbers to the AD8175 control module.
5. The multi-way video processing switcher of claim 1, wherein: the AD8175 control module is configured to: the AD8175 is configured, the initialization setting is carried out on the gating and enabling of each input channel and each output channel of the AD8175 after the configuration is completed, and after the configuration initialization is completed; when the control module captures the rising edge of the effective indication signal of the input channel data or the output channel data, the control module reads related data, the data is sent to the AD8175 for corresponding operation through the AD8175 time sequence generation module, the gating states of the input channel and the output channel are changed, and corresponding channel switching operation is realized; the AD9984 control module is used for: the method comprises the steps of initializing and configuring 4 AD9984 chips, detecting real-time resolutions of video streams input into the 4 AD9984 chips, judging whether the detected resolutions of the video streams are consistent with the configuration, and if the detected resolutions are inconsistent, modifying the corresponding configurations of the AD9984 chips according to the detected resolutions by an operation control module, so that the effect of self-adaption of the resolutions of the input video streams is achieved.
6. The multi-way video processing switcher of claim 1, wherein: the video data acquisition module is used for: collecting VS and HS signals of an input video signal in an input channel, calculating effective time of the VS and HS, analyzing the resolution of the current input video stream according to the duration, further determining each parameter value in a video protocol under the current resolution, analyzing and extracting effective data of the video stream from video stream data according to the determined parameters, converting pixels with the 10bit width into pixels with the 8bit width, and transmitting the pixels with the 10bit width to a next module to perform storage operation along with the generated DE, VS and HS signals; the DDR3 control module is used for: the method comprises the steps that 4 paths of video stream data acquired by a video acquisition module are combined into 128-bit data through a video data processing module in a DDR3 control module, firstly, the 4 paths of video streams after conversion are subjected to synchronous operation through a FIFO buffer memory operation and then through a data acquisition synchronous module, under the action of a DDR3 write control module, the 4 paths of video streams are written into a DDR3 chip to be subjected to buffer memory operation, meanwhile, the DDR3 read control module carries out different modes of reading operation on the data according to the specific conditions of a switching module and a function selection module, then the 4 paths of read data are subjected to corresponding data distribution and combination according to the switching module and the function selection module, and 4 paths of needed new video stream data are generated and transmitted to a next module to be subjected to processing operation.
7. The multi-way video processing switcher of claim 1, wherein: the multi-screen display module is used for: the function control signal generated by the function selection module acts on the channel time-sharing gating module and the data processing combination module in the multi-screen display module, the channel time-sharing gating module is in a 1-4 channel selected state according to the function control signal time-sharing selection, the data processing combination module selectively reads 4 channel data according to requirements according to the function control signal, and the 4 channel data are combined and then transmitted to the new video stream generation module to generate new video data streams to be transmitted to the next module for use.
8. The multi-way video processing switcher of claim 1, wherein: the character generation and addition module is used for: the method comprises the steps of collecting video data streams generated by a multi-screen display module, selecting and reading characters and adding conditions of the characters according to function control signals, determining initial positions of the characters in a video by X-axis input data and Y-axis input data, inserting the characters into required positions by a data insertion combination module, combining the bytes required to be added into new data, and transmitting the new data to a new video stream generation module for the next module to use.
9. The multi-way video processing switcher of claim 1, wherein: the correction module of the '4 sides 8 modes' is used for: when the correction function of the '4 sides 8 modes' is selected, acquiring a selection value of the '4 sides', a selection value of the correction direction and a correction magnitude, and generating an input control signal required by the operation of the UV address generation module through the values, wherein the input control signal is used for controlling the UV address generation module to perform space coordinate conversion operation and converting the space coordinate value into an address value of DDR3 read data; the UV address generating module in the correcting module in the 4-side 8 modes generates 2 paths of information of read data of mutually staggered rows, 2 paths of signals are operated simultaneously, the total data number and interval data number information are extracted from the read data information, meanwhile, the data read out through a new address is cached by using a FIFO, and then the required pixel information is read out from the FIFO according to the values of the extracted total data number and interval data number; the 2 paths of processing channels simultaneously perform the operations, perform interpolation operation according to a video stream output protocol, and finally perform output.
10. A measuring method of a multipath video processing switcher is characterized by comprising the following steps of: comprising the following steps:
step one, a channel detection module detects the state of an input video source of each input channel, an LED control display module indicates the video source access state of the input channel by controlling an LED, an AD8175 control module performs configuration and initialization operation on AD8175, and an AD9984 control module performs configuration and initialization operation on AD 9984;
step two, the key analysis module analyzes the operation information on the key circuit board, the function selection module selects corresponding video processing operation according to the operation information, the switching control module controls gating of an input channel and an output channel of the analog cross point switch AD8175, and the analog video signal is converted into a digital video signal through the AD9984 control module;
step three, the video data acquisition module performs data acquisition and effective data extraction operation on video signals with different resolutions, the acquired multipath video stream data is written into DDR3 for caching under the action of the DDR3 control module, and the cached video stream data is read from DDR3 according to video output time sequence;
step four, the multi-screen display module carries out split-screen algorithm processing on the multi-path video stream data read from the DDR3 to realize split-screen operation of full screen, two split screens, four split screens, five split screens and picture-in-picture, and the video stream data after the split-screen operation is transmitted to the character generation and addition module to carry out character addition operation;
step five, reading the characters from the ROM storing the characters, inserting the read characters at the appointed video stream position, adding character data, combining the character data into new video stream data, and transmitting the new video stream data to a correction module of 4 sides and 8 modes for use;
step six, the correction module of the '4-side 8 modes' carries out multi-angle and high-precision trapezoidal correction operation on the video source, the processed video stream is transmitted to the video output module, and the video output module outputs and displays the received video stream data according to the video output display time sequence and protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111185028.3A CN113923380B (en) | 2021-10-12 | 2021-10-12 | Multipath video processing switcher and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111185028.3A CN113923380B (en) | 2021-10-12 | 2021-10-12 | Multipath video processing switcher and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113923380A CN113923380A (en) | 2022-01-11 |
| CN113923380B true CN113923380B (en) | 2023-06-20 |
Family
ID=79239380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111185028.3A Active CN113923380B (en) | 2021-10-12 | 2021-10-12 | Multipath video processing switcher and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113923380B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016201892A1 (en) * | 2015-06-16 | 2016-12-22 | 邦彦技术股份有限公司 | Fpga-based synchronous video switching system and method |
| CN110519531A (en) * | 2019-09-11 | 2019-11-29 | 华东师范大学 | Multi-path high-definition video distribution formula processing equipment |
-
2021
- 2021-10-12 CN CN202111185028.3A patent/CN113923380B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016201892A1 (en) * | 2015-06-16 | 2016-12-22 | 邦彦技术股份有限公司 | Fpga-based synchronous video switching system and method |
| CN110519531A (en) * | 2019-09-11 | 2019-11-29 | 华东师范大学 | Multi-path high-definition video distribution formula processing equipment |
Non-Patent Citations (1)
| Title |
|---|
| 基于FPGA的多通道视频采集系统设计实现;隋旭阳;李妍妍;向学辅;田瑞娟;;兵器装备工程学报(06);206-209 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113923380A (en) | 2022-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107249101B (en) | High-resolution image acquisition and processing device | |
| CN104935840A (en) | Subtitle rolling display method of splicing display screen and system | |
| CN107948188B (en) | ARINC818-DVI protocol conversion method | |
| CN113014838A (en) | Multi-format high-speed digital video fusion system based on FPGA | |
| CN104717442A (en) | Method of automatically converting video of multiple formats to VESA (Video Electronics Standards Association)-protocol 1600*1200-resolution 60Hz-frame rate video | |
| CN114245029B (en) | FPGA-based data stream processing method and device and PG equipment | |
| CN201623760U (en) | 3G-SDI high-definition digital video frame synchronizer | |
| CN113923380B (en) | Multipath video processing switcher and measuring method thereof | |
| CN101778219A (en) | Device and method for ensuring synchronous working of plurality of camera heads | |
| CN101207835B (en) | Monitor for monitoring video signal power level | |
| CN100544453C (en) | High definition signal mode automatic detection method with fault tolerant mechanism | |
| CN102348127A (en) | Television picture quality detection system and method thereof | |
| CN109587421B (en) | HD-SDI/3G-SDI transceiving and real-time picture-in-picture switching output processing method | |
| CN102158655B (en) | Jitter-free post-correction system for digital video interface (DVI)/high definition multimedia interface (HDMI)/display port (DP)/video graphics array (VGA) signals | |
| CN113923381B (en) | Switch capable of realizing multiple video interfaces and measuring method thereof | |
| CN111263095A (en) | Split-screen display system and method based on domestic platform and storage medium | |
| CN113612938A (en) | Multi-type adaptive resolution image conversion method and device | |
| CN105430297A (en) | Automatic control system for conversion from multi-video format to IIDC protocol video format | |
| EP1452958A2 (en) | On-screen display unit | |
| CN104717446A (en) | Method for automatically converting videos of multiple formats to video of ITU 656 protocol PAL format | |
| CN112188137B (en) | Method for converting high frame frequency progressive image to standard definition PAL interlaced image based on FPGA | |
| CN113141487A (en) | Video transmission module, method, display device and electronic equipment | |
| CN113596348B (en) | Image processing method and device | |
| KR20010081370A (en) | Multi-channel display system | |
| CN102523413A (en) | Method and apparatus for input signal loss detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |