CN201657134U - High-definition video seamless switching device - Google Patents
High-definition video seamless switching device Download PDFInfo
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- CN201657134U CN201657134U CN2010201297826U CN201020129782U CN201657134U CN 201657134 U CN201657134 U CN 201657134U CN 2010201297826 U CN2010201297826 U CN 2010201297826U CN 201020129782 U CN201020129782 U CN 201020129782U CN 201657134 U CN201657134 U CN 201657134U
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Abstract
The utility model relates to a high-definition video seamless switching device. The device comprises video image input cards, an image processing bottom board or backplane, an image synchronization card and an image output card, wherein the video image input cards are used for distributing collected image data subjected to format normalization into a data group A and a data group B and parallel outputting the two groups of data respectively through latches A and B or buffering drive circuits in the same directions or opposite directions; the image processing bottom board or backplane is also provided with double image channels A and B to realize the selected switching of image data of all the video input cards; and the image data of the channels A and B are synchronized to obtain image data of an image output channel C: C=A*beta+B*(1-beta), and the seamless or fade-in fade-out switching effect of video images can be realized through changing the value of the gain beta. Because a stage of tri-state latch or buffering drive circuit in same or opposite directions of the image data is increased by the image processing bottom board or backplane every m video input card slots, the device can expand more video input cards and achieve the performance of high-definition video switching.
Description
Technical field
The utility model relates to the electronic engineering technical field of video image processing, particularly the high clear video image seamless switching device.
Technical background
In the real world applications, we need switch demonstration to the real time video image signal of number of different types or form on a display device.The cut bank of general technology, when switching between unlike signal, picture can blank screen or flicker.In order to realize switching effect seamless or that be fade-in fade-out, must the special video image synchronous circuit of design.
At present common video seamless switching platform can only acceptance criteria definition composite video signal (PAL/NTSC standard), the multichannel composite video enters special-purpose image processing integrated circuit and carries out Synchronous Processing behind digital decoding (DeCoder), and then generates composite video output through digital coding (EnCoder).This seamless switching platform can only be handled the composite video signal of single-definition, can not satisfy the high definition application demand that day by day increases.
Now, some professional video picture processing chip has picture-in-picture (PIP) function, and can realize between two picture merging demonstration, produces seamless thus or the switching effect of being fade-in fade-out.But these video frequency processing chips are the video image of receiving high-definition also, and as VGA, DVI or HDMI signal etc., but the number of signals of input is limited, and can only realize seamless switching between specific signal, uses limitation big.
Technology contents:
The purpose of the utility model device provides a kind of energy and satisfies the high definition application demand that day by day increases, not only can expand more input signal source (comprising digital high-definition signals such as HDSDI, HDMI), can also between more video input channel, carry out switching seamless arbitrarily or light as that fade out.
The utility model device is achieved through the following technical solutions, and a kind of high clear video image seamless switching device comprises that cabinet, image processing circuit reach the power supply for their power supplies, and its image processing circuit comprises:
(1), N opens and is used to receive dissimilar and video input signals form, and become the image resolution ratio form and the output image data of default through the convergent-divergent treatment conversion, simultaneously the view data through the form normalized is distributed into identical A, two groups or more view data of B, respectively through A, the two or more view data of B latch or homophase, anti-phase buffering drive circuit and line output, the three-state that is drive circuit latchs or homophase, anti-phase buffering logical circuit, be with the high-impedance state output control terminal respectively, the video image input card of the output enable control signal that the welding system control switching circuit produces;
(2), be provided with two or more image data transmission passages, two groups or more the identical view data of A, B that is received from video input card output respectively is to its corresponding image channel, realization is switched the selection of each video input card view data, and to the image processing base plate or the backboard of the selection hand-off process of corresponding capable field sync signal and pixel clock signal;
(3), join, can receive the synchronous images signal, and satisfy following formula with image processing base plate or backboard:
C＝A×β+B×(1-β)
Wherein: C is the image output channel; β is the image co-registration coefficient, i.e. gain, and the seamless switching of B channel image to the A channel image when β=0 jumps to β=1, then finished in 0≤β≤1; When β=0 is gradient to β=1, the image output card of the switching effect that the B channel image fades in that then realizes fading out the A channel image.
Described a kind of high clear video image seamless switching device, its video input card can be that the motor synchronizing mode is worked, also external sync mode work; If for the motor synchronizing mode is worked, also include in the system with image processing base plate or backboard output and join, can make view data synchronized images sync card; The input map interlinking of image output card is as the output of sync card.
Described a kind of high clear video image seamless switching device, its video image input card comprises: can gather dissimilar and video input signals form, and handle and convert the image resolution ratio form of default and the inputted video image data processing circuit of output image data to through convergent-divergent, two groups of A, B, or latch or cushion logical circuit more than 2 groups A, B three-state.
Described a kind of high clear video image seamless switching device, its image processing base plate or backboard comprise mutual electrical connection: synchronous processing circuit, the clock treatment circuit, reach when the video input card is worked for the motor synchronizing mode with the corresponding respectively ternary latch cicuit of video image input card, control switching circuit, also include and to make view data synchronized images sync card.
Described a kind of high clear video image seamless switching device, the video input signals of the dissimilar and form that its video image input card received comprises signals such as digital high-definition HDMI, HDSDI.
Described a kind of high clear video image seamless switching device, A * β among its formula C=A * β+B * (the 1-β) promptly is the gain adjustment to the A channel view data, this was both handled and can be realized by the video input card, also can be realized by the image synchronization card, also can be realized by the image output card.
Described a kind of high clear video image seamless switching device, the three-state that its image processing base plate or backboard just increase the one-level view data every m video input card slot latchs or homophase, anti-phase buffering drive circuit.
Described a kind of high clear video image seamless switching device if the image synchronization card adopts the dedicated video picture processing chip design of band picture-in-picture function, then only needs 1 image synchronization card can realize switched design seamless or that be fade-in fade-out.
Described a kind of high clear video image seamless switching device, if the image synchronization card only is used for realizing the function of synchronous images, then need 2 image synchronization cards view data of two image channels of synchronous A, B (or more than 2 passages) respectively, export the image output card then to and make the image overlap-add procedure.
Described a kind of high clear video image seamless switching device, as required, the circuit of image output card and image synchronization card also can directly design on image processing base plate or backboard.
Advantage of the present utility model is, the device of a kind of HD video seamless switching that is provided, can satisfy the high definition application demand that day by day increases, not only can expand more input signal source (comprising digital high-definition signals such as HDSDI, HDMI), can also between more video input channel, carry out switching seamless arbitrarily or light as that fade out.
Description of drawings
Fig. 1: the utility model video input card input/output interface circuit block diagram;
Fig. 2: the utility model apparatus system block diagram;
Fig. 3: the utility model video input card output circuit schematic diagram;
Fig. 4: the utility model image control base plate or backboard synchronous processing circuit schematic diagram;
Fig. 5: the utility model image control base plate or backboard control switching circuit schematic diagram;
Fig. 6: the block diagram of the side circuit of the utility model image synchronization card.
Specific embodiment
The utility model is at the limitation of existing switching device shifter, a kind of new technical method has been proposed, not only can expand more input signal source (comprising digital high-definition signals such as HDSDI, HDMI), can also between more video input channel, carry out switching seamless arbitrarily or light as that fade out.
As shown in Figure 1, the utility model handoff technique adopts the plug-in card mode to design, and mainly comprises video input card, image processing base plate or backboard, image synchronization card and image output card.Wherein the circuit of image output card also can directly design on image processing base plate or backboard.
As shown in Figure 2, can insert N in the utility model apparatus system and open the video input card, every video input card can receive the video input signals of the dissimilar and form of multichannel, such as: PAL/NTSC * 2+HDSDI * 1+HDMI * 1+VGA * 1+DVI * 1.When the user controls, must choose the signal source of every video input card in advance.Video source on the monolithic video input card is switched can not realize effect seamless or that be fade-in fade-out.
The video input card is mainly gathered dissimilar and video input signals form, and handle and convert the image resolution ratio form and the output image data of default to through convergent-divergent, such as resolution is 1920 * 1080, and field frequency is the progressive format of 60Hz, and this paper is called the form normalized.The video input card is distributed into the identical view data of two groups of A, B (or more than 2 groups) to the view data through the form normalized, and latchs or cushion the output of driving channel parallel through A, B respectively.A, B output channel are three-state and latch or cushion logical circuit, are with high-impedance state input control end respectively, A, B output enable control signal that the welding system control switching circuit produces.
The video input card can be that the motor synchronizing mode is worked, also external sync mode work.The motor synchronizing mode is the clock signal that the video input card has oneself, and according to the image resolution ratio form of default embark on journey next life, field sync signal.Therefore, the view data of all video input card output is nonsynchronous in the system, for last switching seamless or that be fade-in fade-out, the palpus increase image synchronization card in the system realized.If the image synchronization card adopts the dedicated video picture processing chip design of band picture-in-picture function, then only need 1 image synchronization card can realize switched design seamless or that be fade-in fade-out.At this moment, then also can not need the image output card, and directly switch image by the output of image synchronization card.If the image synchronization card only is used for realizing the function of synchronous images, then need 2 image synchronization cards view data of synchronous A, two image channels of B respectively, export the image output card then to and make the image overlap-add procedure.
According to the video processing circuits scheme of selecting for use, the video input card also can beyond synchronous mode work, promptly the pixel clock of video input card output image data and row, field sync signal provide by image processing base plate or backboard.Because of all video input cards all with identical pixel clock and row, field sync signal output image data, so system does not then need the image synchronization card.
System adopts A, B dual image passage (or more than 2 passages) design, and the video input card is exported 2 tunnel identical view data branches and is clipped to A, B image channel on image processing base plate or the backboard.Image processing base plate or backboard are mainly realized the selection of each video input card view data is switched, and to the selection hand-off process of corresponding capable field sync signal and clock signal.For example: what current demonstration was selected is the A channel view data of 1# video input card, shows that image processing base plate or backboard are then selected the B channel image data of 2# video input card if desire to switch to 2# video input card.When continuing to switch to the demonstration of 3# video input card, then select the A channel view data of 3# video input card.A, B dual image channels designs, guaranteed seamless or the handoff procedure of being fade-in fade-out in, current (A or B passage) and the video image that be about to switch (B or A channel) are in stable status always.Moreover, the view data of A, B switching channel must be finished all synchro processing before switching output.If the view data of A, B switching channel is synchronous fully, then last image output channel C can be drawn by following formula:
C＝A×β+B×(1-β)
Wherein β is the image co-registration coefficient, i.e. gain.0≤β≤1。When β=0 jumps to β=1, then finish the seamless switching of B passage to A channel; When β=0 is gradient to β=1, then realize the A channel image B channel image switching effect of fading in of fading out.
A * β promptly is the gain adjustment to the A channel view data, and this was both handled and can be realized by the video input card, also can be realized by the image synchronization card, also can be realized by the image output card, and specific design can be determined according to the side circuit scheme.
Can expand common N video input card slot on image processing base plate or the backboard, the three-state that every m slot the one-level view data is set just in N video input card slot latchs or buffering drive circuit, increase the impedance matching of image data transmission thus, guarantee the multistage transmission performance of the high-definition image data of every video input card, and then just can expand more video input card slot.
N opens corresponding N the video input channel of video input card, and is seamless or be fade-in fade-out to switch between this N video input channel and carry out on the operation and control interface, but all switches to A, B image channel by image processing base plate or backboard selection in internal system.
Below in conjunction with circuit, the utility model is described in further detail:
1) the video input card of this utility model can adopt following physical circuit scheme to realize:
The dedicated video image processing integrated circuit FLI32626H-BG that adopts the production of ST company is as main process chip.FLI32626H-BG can directly receive HDMI, DVI, VGA, CVBS high definition or SD vision signals such as (PAL/NTSC), and the HDSDI/SDI digital video signal is then separated the DIGITAL INPUT mouth that FLI32626H-BG is transported in mediation GS2974 decoding through the GENNUM GS2974 of company earlier.
FLI32626H-BG works in the motor synchronizing mode, and the video input card is with the synthetic required image pixel clock of different-format of 19.6608MHz crystal on the plate, and to row, field sync signal that should form.
FLI32626H-BG gathers and convergent-divergent is handled video input signals dissimilar and form, the last a kind of resolution format output image data that all sets with system, this view data export to Transistor-Transistor Logic level and are with the latching of high-impedance state, homophase or anti-phase buffering drive circuit.
The ternary latch cicuit of the A as shown in Figure 1, B view data output channel is selected the SN74LVC16374ADGGR of TI company for use, and Fig. 3 is the ternary latch cicuit example of the high 14 bit image data of A channel.N1 high resistant output state is by the control of " CH1-IMG-OUT-OEA " control signal among the figure, and when being high, QTO-A15 is high resistant output to QTO-A29, and when being low, QTO-A15 is the output of ' 0 ', ' 1 ' logic to QTO-A29.2) image processing backplane circuit block diagram of the present invention as shown in Figure 2, wherein ternary latch cicuit is selected SN74LVC16374ADGGR for use.And synchronous processing circuit is selected programmable logic chip (EPLD) the EPM7032AETC44 design of ALTERA company for use, physical circuit as described in Figure 4, wherein DHSCH1, DVSCH1 are respectively row, field sync signal from 6 video input card output images to DHSCH6, DVSCH6, and three control lines of CHASEL0, CHASEL1 and CHASEL2 are used for selecting 1 group of row as A channel, field sync signal TDAHS, TDAVS from 6 road input sync signals; Same CHBSEL0, CHBSEL1 and three control lines of CHBSEL2 are used for selecting 1 group of row as the B passage, field sync signal TDBHS, TDBVS from 6 road input sync signals.
The control switching circuit of image processing base plate or backboard still selects for use EPM7032AETC44 to realize, is illustrated in figure 5 as A image channel control switching circuit example.Wherein DCLKACH1 is a pixel clock from 6 video input card output image datas to DCLKACH6, OEACH1 is the control signal that enables of 6 video input card output image datas to OEACH6, OEACH12, OEACH34, OEACH56 is respectively the control signal that enables of image processing base plate epigraph data latches, CHASEL0, during mainly selecting from DCLKACH1 to DCLKACH6, three control lines of CHASEL1 and CHASEL2 select 1 tunnel pixel clock signal: DCLKACHnO as the A channel view data, OEACH1 is to OEACH6 in set simultaneously, CHASEL0, CHASEL1 and CHASEL2 are to corresponding high-low level, and the n that makes us select opens the image data transmission of video input card to the image synchronization card.
3) the side circuit block diagram of the image synchronization card of this utility model as shown in Figure 6, the image synchronization card is mainly realized the function of image frame rate conversion, promptly the frame frequency of output image is irrelevant with the frame frequency of input picture, image is exported synchronously by external synchronization signal.Two image synchronization cards of A, B are synchronous by same group of external synchronization signal, and they are by same pixel clock output image data, the view data of output image channel C can be drawn the switching effect that realizes seamless switching thus or be fade-in fade-out by C=A * β+B * (1-β) thus.The β of this utility model, (1-β) must gain and express by adjustment image synchronization card A, B output image.
Claims (10)
1. high clear video image seamless switching device, the power supply that comprises cabinet, image control circuit and power for their is characterized in that image control circuit comprises:
(1), N opens and is used to receive dissimilar and video input signals form, and become the image resolution ratio form and the output image data of default through the convergent-divergent treatment conversion, simultaneously the view data through the form normalized is distributed into identical A, two groups or more view data of B, respectively through A, the two or more view data of B latch or homophase, anti-phase buffering drive circuit and line output, the three-state that is drive circuit latchs or homophase, anti-phase buffering logical circuit, be with high-impedance state input control end respectively, the video image input card of the output enable control signal that the welding system control switching circuit produces;
(2), be provided with two or more image data transmission passages, two groups or more the identical view data of A, B that is received from video input card output respectively is to its corresponding image channel, realization is switched the selection of each video input card view data, and to the image processing base plate or the backboard of the selection hand-off process of corresponding capable field sync signal and pixel clock signal;
(3), join, can receive the synchronous images signal, and satisfy following formula with image processing base plate or backboard:
C＝A×β+B×(1-β)
Wherein: C is the image output channel; β is the image co-registration coefficient, i.e. gain, and the seamless switching of B channel image to the A channel image when β=0 jumps to β=1, then finished in 0≤β≤1; When β=0 is gradient to β=1, the image output card of the switching effect that the B channel image fades in that then realizes fading out the A channel image.
2. a kind of high clear video image seamless switching device according to claim 1 is characterized in that, the video input card can be that the motor synchronizing mode is worked, also external sync mode work; If for the motor synchronizing mode is worked, also include in the system with image processing base plate or backboard output and join, can make view data synchronized images sync card; The input map interlinking of image output card is as the output of sync card.
3. a kind of high clear video image seamless switching device according to claim 1 and 2, it is characterized in that, the video image input card comprises: can gather dissimilar and video input signals form, and handle and convert the image resolution ratio form of default and the inputted video image data processing circuit of output image data to through convergent-divergent, two groups of A, B, or latch or cushion logical circuit more than 2 groups A, B three-state.
4. a kind of high clear video image seamless switching device according to claim 1 and 2, it is characterized in that, image processing base plate or backboard comprise mutual electrical connection: synchronous processing circuit, the clock treatment circuit, reach when the video input card is worked for the motor synchronizing mode with the corresponding respectively ternary latch cicuit of video image input card, control switching circuit, also include and to make view data synchronized images sync card.
5. a kind of high clear video image seamless switching device according to claim 1 and 2 is characterized in that the video input signals of the dissimilar and form that the video image input card received comprises signals such as digital high-definition HDMI, HDSDI.
6. a kind of high clear video image seamless switching device according to claim 1 and 2, it is characterized in that, A * β among formula C=A * β+B * (the 1-β) promptly is the gain adjustment to the A channel view data, this processing both can be realized by the video input card, also can realize, also can realize by the image output card by the image synchronization card.
7. a kind of high clear video image seamless switching device according to claim 1 and 2 is characterized in that, the three-state that image processing base plate or backboard just increase the one-level view data every m video input card slot latchs or homophase, anti-phase buffering drive circuit.
8. a kind of high clear video image seamless switching device according to claim 2, it is characterized in that, if the image synchronization card adopts the dedicated video picture processing chip design of band picture-in-picture function, then only need 1 image synchronization card can realize switched design seamless or that be fade-in fade-out.
9. a kind of high clear video image seamless switching device according to claim 2, it is characterized in that, if the image synchronization card only is used for realizing the function of synchronous images, then need 2 image synchronization cards view data of two image channels of synchronous A, B (or more than 2 passages) respectively, export the image output card then to and make the image overlap-add procedure.
10. a kind of high clear video image seamless switching device according to claim 1 is characterized in that, as required, the circuit of image output card and image synchronization card also can directly design on image processing base plate or backboard.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783917A (en) * | 2010-02-09 | 2010-07-21 | 深圳市唯奥视讯技术有限公司 | Method for realizing seamless switching of high-definition videos |
| CN102752543A (en) * | 2012-07-27 | 2012-10-24 | 北京威泰嘉业科技有限公司 | Seamless switching method and seamless switching system of high-definition hybrid matrix |
| CN103079042A (en) * | 2011-10-26 | 2013-05-01 | 康佳集团股份有限公司 | Video signal processing device and method |
| CN103686039A (en) * | 2012-09-11 | 2014-03-26 | 北京同步科技有限公司 | Multichannel video capture card and processing method thereof |
| CN104702860A (en) * | 2015-03-19 | 2015-06-10 | 深圳市载德光电技术开发有限公司 | FPGA-based (field programmable gate array-based) video image switching system |
| CN113365189A (en) * | 2021-06-04 | 2021-09-07 | 上海傅硅电子科技有限公司 | Multi-channel seamless switching method |
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2010
- 2010-02-09 CN CN2010201297826U patent/CN201657134U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783917A (en) * | 2010-02-09 | 2010-07-21 | 深圳市唯奥视讯技术有限公司 | Method for realizing seamless switching of high-definition videos |
| CN101783917B (en) * | 2010-02-09 | 2014-02-19 | 深圳市唯奥视讯技术有限公司 | Method for realizing seamless switching of high-definition videos |
| CN103079042A (en) * | 2011-10-26 | 2013-05-01 | 康佳集团股份有限公司 | Video signal processing device and method |
| CN102752543A (en) * | 2012-07-27 | 2012-10-24 | 北京威泰嘉业科技有限公司 | Seamless switching method and seamless switching system of high-definition hybrid matrix |
| CN103686039A (en) * | 2012-09-11 | 2014-03-26 | 北京同步科技有限公司 | Multichannel video capture card and processing method thereof |
| CN104702860A (en) * | 2015-03-19 | 2015-06-10 | 深圳市载德光电技术开发有限公司 | FPGA-based (field programmable gate array-based) video image switching system |
| CN104702860B (en) * | 2015-03-19 | 2017-12-05 | 深圳市载德光电技术开发有限公司 | Video image switching system based on FPGA |
| CN113365189A (en) * | 2021-06-04 | 2021-09-07 | 上海傅硅电子科技有限公司 | Multi-channel seamless switching method |
| CN113365189B (en) * | 2021-06-04 | 2022-08-05 | 上海傅硅电子科技有限公司 | Multi-channel seamless switching method |
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Granted publication date: 20101124 |