CN104717445A - Method for automatically converting videos of multiple formats to video of BT.656 protocol NTSC format - Google Patents
Method for automatically converting videos of multiple formats to video of BT.656 protocol NTSC format Download PDFInfo
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Abstract
The invention relates to a method for automatically converting videos of multiple formats to a video of a BT.656 protocol NTSC format. The method comprises the following steps that 1, an automatic conversion system is set up; 2, input video signals are sent into a protocol detection module; 3, high level enable signals CEn drive a protocol N collection unit corresponding to a protocol N detection unit to collect effective pixels of the input video signals; 4, the high level enable signals CEn are used as control semaphore of a multiplexer switch controller; 5, a zooming process module zooms resolution ratio of a video to 640* 480, and the video is written into an output storage unit; 6, a sending control module generates control pixel streams of an NTSC video blanking area according to the BT.656 protocol, and conversion of the input video to the NTSC format video is achieved. The method solves the problem of integration generated in conversion from videos of any protocol format to the video of the PAL format, videos of any protocol format and any resolution ratio can be automatically converted to the NTSC format video meeting the BT.656 protocol, and time for the video format conversion is short.
Description
Technical field
The invention belongs to Video processing, graph image field, be specifically related to the automatic switching method of a kind of many video formats to BT.656 agreement TSC-system formula video.
Background technology
TSC-system formula analog video is a kind of video format of classics, usually used as the standard interface of video frequency output in numerous application scenario.But for existing vision sensor, its video protocols exported is different, and the Video Quality Metric therefore often needing the various agreements exported by vision sensor is the TSC-system formula meeting BT.656 agreement; Although there is the chip of various video format to TSC-system formula Video Quality Metric at present, this kind of chip has often only been supported encoding and decoding that are a kind of or a class input video.
Along with the development of electronic technology, large scale integrated circuit, adopt field programmable gate array (FPGA) realizing complicated control and processing capacity has very large advantage in integration, stability and reliability etc., the various video form studied based on FPGA has broad application prospects to the automatic switching control method of the TSC-system formula video meeting BT.656 agreement.
Summary of the invention
The present invention be video in order to solve any protocol type to the integration problem meeting BT.656 agreement TSC-system formula Video Quality Metric, propose the automatic switching method of a kind of many video formats to BT.656 agreement TSC-system formula video.
Technical solution of the present invention:
Many video formats are to the automatic switching method of BT.656 agreement TSC-system formula video, and its special character is, comprises the following steps:
1] automated conversion system is created:
Comprise protocol detection module: for carrying out agreement coupling to incoming video signal, and produce high level enable signal CEn or low-level enable signal according to matching result, comprise agreement 1 detecting unit, agreement 2 detecting unit ... and agreement N detecting unit;
Video acquisition module: gather the valid pixel of the incoming video signal matched through protocol detection module, comprises agreement 1 collecting unit, agreement 2 collecting unit ... and agreement N collecting unit; The collecting unit of various agreement and detecting unit one_to_one corresponding, described high level enable signal CEn inputs to the agreement N collecting unit of correspondence and multidiameter option switch controller;
Multidiameter option switch controller: under the control of high level enable signal CEn, buffers into collection memory cell by the effective pixel data that the video acquisition module that agreement is mated collects;
Gather memory cell: for the effective pixel data of buffer memory incoming video signal;
Convergent-divergent processing module: read effective pixel data for real time sequence from collection memory cell and adopt bilinear interpolation algorithm to be scaled the resolution sizes of 640*480, sending it to output memory cell simultaneously;
Export memory cell: for storing the effective pixel data after the process of convergent-divergent processing module;
And transmission control module: for producing the control pixel stream of ntsc video blanking zone according to BT.656 agreement, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video;
2] vision signal of input is sent in protocol detection module respectively detects in each protocol detection unit, if the vision signal of input is mated with the agreement of this agreement N detecting unit, then this agreement N detecting unit produces the enable signal CEn of high level, and all the other protocol detection unit produce low-level enable signal simultaneously;
3] high level enable signal CEn drives the valid pixel of the agreement N collecting unit Gather and input vision signal corresponding with agreement N detecting unit; Low-level enable signal makes to be in reset mode with the agreement collecting unit corresponding to it simultaneously;
4] high level enable signal CEn is as the control signal amount of multidiameter option switch controller, makes a valid pixel of the vision signal of the agreement N collecting unit collection of protocols having coupling by multidiameter option switch controller cache to gathering memory cell;
5] convergent-divergent processing module is from the effective pixel data gathering memory cell order reading whole frame, and adopts bilinear interpolation algorithm to be scaled the resolution sizes of 640*480, is write simultaneously and exports memory cell;
6] control module produces ntsc video blanking zone control pixel stream according to BT.656 agreement is sent, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video.
Protocol detection module and video acquisition module work according to the mode of parallel pipelining process, synchronously mate with each protocol detection unit, and produce matching result when frame of video end of input simultaneously.
Above-mentioned collection memory cell comprises buffering area A and buffering area B: concrete storing step is:
When current video frame data are stored into buffering area A, the previous frame video data reading storage from the B of buffering area sends to convergent-divergent processing module;
When next frame video data is stored into buffering B, the data reading current video frame from the A of buffering area send to convergent-divergent processing module.
The real-time analysis of above-mentioned protocol detection module also calculates the following protocol status parameter of input video stream: the line synchronizing signal Hsync pulse number comprised between opposite field synchronizing signal Vsync pulse; The line synchronizing signal Hsync pulse number comprised in field sync signal Vsync pulse width range; The pixel clock clk cycle number comprised between adjacent lines synchronizing signal Hsync pulse; The pixel clock clk cycle number comprised in line synchronizing signal Hsync pulse width range; The pixel clock clk cycle number comprised in data valid signal De pulse duration during valid pixel is capable; From field sync signal Vsync impulse hits play first valid pixel capable between the line synchronizing signal Hsync pulse number that comprises; Play the pixel clock clk cycle counting comprised between data valid signal De from line synchronizing signal pulse Hsync saltus step during valid pixel is capable.
Above-mentioned protocol detection module comprise the VESA protocol video detecting unit of various resolution, various resolution RawRGB format video detecting unit, meet the video detecting unit of SMPTE274 agreement, meet the detecting unit of ITU601, ITU656 and ITU709 protocol video; Described video acquisition module comprise the VESA protocol video collecting unit of various resolution, various resolution RawRGB format video collecting unit, meet the video acquisition unit of SMPTE274 agreement, meet the collecting unit of ITU601, ITU656 and ITU709 protocol video; And detectable protocol type independently can customize and cutting according to embody rule demand;
Above-mentioned steps 2] concrete steps be:
2.1] real-time synchronization calculates each state parameter of incoming video signal:
2.2] state parameter of each state parameter calculated with each agreement of corresponding protocol detection module is contrasted: if state parameter is consistent, then inputting video data belongs to this kind of agreement; Otherwise, then this kind of agreement is not belonged to.
The invention has the beneficial effects as follows:
The video of any protocol type and resolution can be automatically converted to the TSC-system formula video meeting BT.656 agreement, and video format conversion is consuming time little; Dynamic detects the change of video protocols, after input source video protocols changes, can complete the detection to its protocol type within the time interval of a two field picture input; Detectable protocol type independently can customize and cutting according to embody rule demand.
Accompanying drawing explanation
Fig. 1 is the automatic switching method schematic diagram of many video formats to BT.656 agreement TSC-system formula video.
Embodiment
The present invention adopts FPGA to realize the automatic switching method of many video formats to BT.656 agreement TSC-system formula video, by setting up many general video protocol data storehouse, the data flow of incoming video signal is analyzed, with protocol type belonging to various conventional video protocol data stream multilevel iudge, detected image resolution and frame per second simultaneously; Design drawing picture frame double buffering A and B, adopt the mode of ping-pong operation by the valid pixel of video stream data frame stored in buffering area A, simultaneously according to the resolution of image to the complete data frame of buffer memory in the B of buffering area adopt bilinear interpolation algorithm be scaled 640*480 resolution sizes and stored in output memory cell; Produce the control pixel stream of ntsc video blanking zone according to BT.656 agreement, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video;
Realize details specific as follows:
1] design is for the detection module of various conventional video protocols (comprising the VESA agreement of various resolution, the RawRGB form of various resolution, ITU601, ITU656, ITU709 and SMPTE274 agreement), detection module, by the time interval of an analysis full frame images expert field sync signal and the Changing Pattern of blanking zone video data, judges whether input video belongs to this kind of agreement;
Detection module arranges the state parameter of following video protocols, be respectively: line synchronizing signal (Hsync) pulse number comprised between opposite field synchronizing signal (Vsync) pulse, the Hsync pulse number comprised in Vsync pulse width range, pixel clock (CLK) cycle count comprised between adjacent Hsync pulse, the clk cycle counting comprised in Hsync pulse width range, the clk cycle pulse number comprised in data valid signal (De) pulse duration during valid pixel is capable, from the saltus step of Vsync signal pulse play first valid pixel capable between (field blanking district) Hsync pulse number of comprising, during valid pixel is capable from the saltus step of Hsync signal pulse play De signal effectively between (horizontal blanking district) clk cycle counting of comprising,
2] data of input video and control signal wire (CLK, Hsync, Vsync and De) are sent into each video protocols detection module respectively, detection module analyzes the data flow of input picture frame, detect and calculate above-mentioned state parameter, if the parameter detected is consistent with the state parameter of agreement to be detected, then think that input video belongs to this kind of agreement, otherwise, then this kind of agreement is not belonged to; If certain agreement coupling input video, then the detection module of this kind of agreement produces the enable signal CEn of high level, drives the acquisition module of its correspondence; Other protocol detection modules export as low level signal simultaneously, and make video acquisition module corresponding to its rear end place be in reset mode.
3] a multidiameter option switch controller is designed, the CEn exported with each video protocols detection module is for control signal amount, the video data stream that each video protocols acquisition module gathers is input, and gating CEn is that the collection video data stream that high level is corresponding carries out follow-up buffer memory and convergent-divergent process operation;
4] double buffering A and B is designed, the valid pixel of adjacent two two field pictures that buffer memory arrives continuously, ping-pong operation is carried out to buffering area A and B, when current frame image being filled into buffering area A, adopt bilinear interpolation algorithm to be scaled 640*480 to the previous frame image of buffer memory in B and differentiate size, and be filled in transmission output memory cell; At subsequent time period, next frame image buffer storage is entered buffering area B and bilinear interpolation process is carried out to the picture frame in the A of buffering area and exports memory cell stored in transmission;
5] produce the control pixel stream of ntsc video blanking zone according to BT.656 agreement, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video.
Automatic switching control method of the present invention is successful implementation in certain type test module, can the vision signal of the agreement such as VESA, RawRGB of the various resolution of Real-time and Dynamic Detection, automatically complete video scaling process and unify to be converted to the NTSC format video meeting BT.656 agreement, the processing speed of Video Quality Metric is fast, exports steady and audible.
Claims (6)
1. video format more than, to the automatic switching method of BT.656 agreement TSC-system formula video, is characterized in that, comprises the following steps:
1] automated conversion system is created:
Comprise protocol detection module: for carrying out agreement coupling to incoming video signal, and produce high level enable signal CEn or low-level enable signal according to matching result, comprise agreement 1 detecting unit, agreement 2 detecting unit ... and agreement N detecting unit;
Video acquisition module: the valid pixel of the incoming video signal matched through protocol detection module is gathered, comprise agreement 1 collecting unit, agreement 2 collecting unit ... and agreement N collecting unit; The collecting unit of various agreement and detecting unit one_to_one corresponding, described high level enable signal CEn inputs to the agreement N collecting unit of correspondence and multidiameter option switch controller;
Multidiameter option switch controller: under the control of high level enable signal CEn, buffers into collection memory cell by the effective pixel data that the video acquisition module that agreement is mated collects;
Gather memory cell: for the effective pixel data of buffer memory incoming video signal;
Convergent-divergent processing module: read effective pixel data for real time sequence from collection memory cell and adopt bilinear interpolation algorithm to be scaled the resolution sizes of 640*480, sending it to output memory cell simultaneously;
Export memory cell: for storing the effective pixel data after the process of convergent-divergent processing module;
And transmission control module: for producing the control pixel stream of ntsc video blanking zone according to BT.656 agreement, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video;
2] vision signal of input is sent in protocol detection module respectively detects in each protocol detection unit, if the vision signal of input is mated with the agreement of this agreement N detecting unit, then this agreement N detecting unit produces the enable signal CEn of high level, and all the other protocol detection unit produce low-level enable signal simultaneously;
3] high level enable signal CEn drives the valid pixel of the agreement N collecting unit Gather and input vision signal corresponding with agreement N detecting unit; Low-level enable signal makes to be in reset mode with the agreement collecting unit corresponding to it simultaneously;
4] high level enable signal CEn is as the control signal amount of multidiameter option switch controller, makes a valid pixel of the vision signal of the agreement N collecting unit collection of protocols having coupling by multidiameter option switch controller cache to gathering memory cell;
5] convergent-divergent processing module is from the effective pixel data gathering memory cell order reading whole frame, and adopts bilinear interpolation algorithm to be scaled the resolution sizes of 640*480, is write simultaneously and exports memory cell;
6] control module produces ntsc video blanking zone control pixel stream according to BT.656 agreement is sent, and read the pixel data after convergent-divergent from exporting order memory cell, be filled into the effective pixel region of video data stream, thus realize the conversion of input video to TSC-system formula video.
2. many video formats according to claim 1 are to the automatic switching method of BT.656 agreement TSC-system formula video, it is characterized in that, protocol detection module and video acquisition module work according to the mode of parallel pipelining process, synchronously mate with each protocol detection unit, and produce matching result when frame of video end of input simultaneously.
3. many video formats according to claim 1 and 2 are to the automatic switching method of BT.656 agreement TSC-system formula video, it is characterized in that, described collection memory cell comprises buffering area A and buffering area B: concrete storing step is:
When current video frame data are stored into buffering area A, the previous frame video data reading storage from the B of buffering area sends to convergent-divergent processing module;
When next frame video data is stored into buffering B, the data reading current video frame from the A of buffering area send to convergent-divergent processing module.
4. many video formats according to claim 3 are to the automatic switching method of BT.656 agreement TSC-system formula video, it is characterized in that:
The real-time analysis of described protocol detection module also calculates the following protocol status parameter of input video stream: the line synchronizing signal Hsync pulse number comprised between opposite field synchronizing signal Vsync pulse; The line synchronizing signal Hsync pulse number comprised in field sync signal Vsync pulse width range; The pixel clock clk cycle number comprised between adjacent lines synchronizing signal Hsync pulse; The pixel clock clk cycle number comprised in line synchronizing signal Hsync pulse width range; The pixel clock clk cycle number comprised in data valid signal De pulse duration during valid pixel is capable; From field sync signal Vsync impulse hits play first valid pixel capable between the line synchronizing signal Hsync pulse number that comprises; Play the pixel clock clk cycle counting comprised between data valid signal De from line synchronizing signal pulse Hsync saltus step during valid pixel is capable.
5. many video formats according to claim 4 are to the automatic switching method of BT.656 agreement TSC-system formula video, it is characterized in that:
Described protocol detection module comprise the VESA protocol video detecting unit of various resolution, various resolution RawRGB format video detecting unit, meet the video detecting unit of SMPTE274 agreement, meet the detecting unit of ITU601, ITU656 and ITU709 protocol video; Described video acquisition module comprise the VESA protocol video collecting unit of various resolution, various resolution RawRGB format video collecting unit, meet the video acquisition unit of SMPTE274 agreement, meet the collecting unit of ITU601, ITU656 and ITU709 protocol video; And detectable protocol type independently can customize and cutting according to embody rule demand.
6. many video formats according to claim 5 are to the automatic switching method of BT.656 agreement TSC-system formula video, it is characterized in that,
Described step 2] concrete steps be:
2.1] real-time synchronization calculates each state parameter of incoming video signal:
2.2] state parameter of each state parameter calculated with each agreement of corresponding protocol detection module is contrasted: if state parameter is consistent, then inputting video data belongs to this kind of agreement; Otherwise, then this kind of agreement is not belonged to.
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| CN112188137A (en) * | 2019-07-01 | 2021-01-05 | 北京华航无线电测量研究所 | Method for converting high frame frequency progressive image to standard definition PAL interlaced image based on FPGA |
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