CN101854487A - Video signal switching system and method - Google Patents
Video signal switching system and method Download PDFInfo
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- CN101854487A CN101854487A CN200910130328A CN200910130328A CN101854487A CN 101854487 A CN101854487 A CN 101854487A CN 200910130328 A CN200910130328 A CN 200910130328A CN 200910130328 A CN200910130328 A CN 200910130328A CN 101854487 A CN101854487 A CN 101854487A
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Abstract
The invention provides a video signal switching system and a video signal switching method. The system comprises a receiving module, a detecting module and a switching module, wherein the receiving module is used for receiving a command of switching a currently displayed first video signal to a second video signal, and sending a message according to the command; the detecting module is used for detecting whether the first video signal reaches a vertical blanking period according to the message, and if the detected first video signal reaches the vertical blanking period, the detecting module sends a switching command; and the switching module is used for switching the first video signal to the second video signal according to the switching command.
Description
Technical field
The application relates to vision signal and switches.
Background technology
Video switching system is widely used in convention system, control system and supervisory control system.Because the video source that will gather is a lot, display device often need carry out high density and switch between each video source.
Usually adopt row-field scanning in the video system, for example, line by line scan, interlacing scan etc.Every row comprises a plurality of picture points, and every comprises a plurality of row.Scanning beam from left to right scanned delegation, again scan next line in, need close electron gun, horizontal blanking is named in this action.When having scanned a field signal and change to another field signal again, scanning beam is got back to the upper left corner from the lower right corner, and close the action of electron gun field blanking this moment.At row latent period and vertical blanking period, display interior work, video source data is invalid.The row field information is represented the time interval of row-field scanning, comprises two picture points of scanning, two row and the time intervals between two.
In the prior art, directly adopt switch or switch module to carry out vision signal usually and switch.For example, the two-path video source is connected in display device by switch (for example knife switch), and display device can only be connected road video source wherein.When needs when one tunnel video source switches to another road, directly switch with switch.This direct switching system switching mode is applicable to the less demanding occasion of video effect.Since in the process of switching display device often can't be normally shows signal synchronously, screen blank screen or shake appear easily, therefore, this switched system is not suitable for the occasion that High Density Video is switched.
Therefore, expectation obtains a kind of video switching system and method, makes display device can be between each video source switch smoothly and blank screen or screen shake do not take place.
Summary of the invention
The application is intended to solve the video jitter problem of video switching system, thereby realizes taking over seamlessly of vision signal.
According to an aspect of the present invention, provide a kind of video switching system.This system comprises: receiver module, and it is configured to receive the order that switches to second vision signal from first vision signal of current demonstration, and initiates a message according to described order; Detection module, it is configured to whether arrive vertical blanking period according to described first vision signal of described message detection, arrives vertical blanking period if detect described first vision signal, and described detection module sends switching command; And handover module, it is configured to switch to described second vision signal according to described switching command from described first vision signal.
According to a further aspect in the invention, provide a kind of vision signal changing method.This method may further comprise the steps: receive the order that switches to second vision signal from first vision signal of current demonstration; Detect described first vision signal according to described order and whether arrive vertical blanking period; And if detect described first vision signal and arrive vertical blanking period, then switch to described second vision signal from described first vision signal.
Adopt system and method for the present invention, can switch to another road vision signal from one tunnel vision signal smoothly, and shake or blank screen phenomenon do not take place.
Description of drawings
By the description of the application's illustrative embodiments being carried out with reference to following accompanying drawing, wherein:
Fig. 1 is the block diagram according to the video switching system of the application's illustrative embodiments;
Fig. 2 is the block diagram according to the video switching system of another illustrative embodiments of the application;
Fig. 3 is the structured flowchart according to the video switching system of the another illustrative embodiments of the application;
Fig. 4 is the flow chart according to the vision signal changing method of exemplary embodiment of the invention; And
Fig. 5 is the flow chart of the vision signal changing method of another illustrative embodiments according to the present invention.
Embodiment
Below, with reference to accompanying drawing and in conjunction with exemplary execution mode the video switching system and the method for asking in the basis is described.
Fig. 1 shows the video switching system 100 according to exemplary embodiment of the invention, and it can be with the multi-channel video signal 20A from a plurality of video source, 20B ..., 20K is presented at one or more display device 30A with switching, 30B ..., on the 30G.
As shown in Figure 1, video switching system 100 comprises receiver module 101, detection module 102 and handover module 103.Receiver module 101 receives switching command and initiates a message to detection module 102 according to switching command.Whether detection module 102 arrives vertical blanking period according to the current display device video signal displayed of this message detection.Arrive vertical blanking period if detect current display device video signal displayed, 102 of detection modules send switching command to handover module 103, and handover module 103 is carried out according to switching command and switched; Otherwise detection module 102 continues to detect.
Do not receiving under the situation of switching command, display device 30A, 30B ..., 30G can be according to certain corresponding relation display video signal 20A, 20B ..., 20K.For example, display device 30A displayable video signal 20A.
Fig. 2 shows another illustrative embodiments of the present invention, and wherein, video switching system 100 comprises receiver module 101, detection module 102, handover module 103, memory module 104 and computing module 105.In this execution mode, the vision signal with different images parameter can be converted to the signal that has the identical image parameter and be applicable to display device, thereby further avoid flating.
Whether the to be shown vision signal 20B of detection module 102 detection of stored in memory module 104 reaches scheduled volume, for example, and predetermined line number.Because follow-up will the processing to vision signal, and Video signal processing is that the pixel cell (for example 3 * 3 pixel cell) that constitutes with a plurality of pixels is that unit carries out, therefore, need reach in the vision signal to be shown of storage and carry out vision signal under the situation of certain line number and handle.Reach scheduled volume if detect the vision signal 20B of storage, 102 of detection modules detect current video signal displayed 20A and whether arrive vertical blanking period; Otherwise whether the vision signal 20B that continues detection of stored reaches scheduled volume.Arrive vertical blanking period if detect current video signal displayed 20A, 102 of detection modules send switching command.
The computing module 105 vision signal 20B computing of adaptive switched module 103 in the future is the output signal that is suitable for showing.Vision signal 20B from handover module 103 (for example may have the different images parameter, resolution), by various rapid image Processing Algorithm, can with vision signal 20B computing the output signal that has the identical image parameter and be suitable for showing with different images parameter.For example, the output signal that obtains of computing can be adapted to the resolution of output equipment.This computing can utilize algorithm of the prior art, for example interpolation weighting algorithm and weighted average value-based algorithm etc.
That is to say, according to exemplary embodiment of the invention, video switching system is receiving the demonstration on first display device after first vision signal switches to the order of second vision signal, prepares second vision signal and continues to show first vision signal simultaneously.After second vision signal ready (just, when second vision signal of storing reaches scheduled volume), whether first vision signal that detects current demonstration arrives vertical blanking period.If then switch to ready second vision signal; Otherwise, continue to show that first vision signal arrives vertical blanking period up to it, switch to ready second vision signal then.Owing to be the switching that the vertical blanking period in first vision signal carries out, therefore this switching can not influence the display effect on the display device.In addition, because second vision signal of storage has reached scheduled volume when switching, therefore, even the pixel cell that arithmetic element need constitute with a plurality of pixels be that unit carries out a series of follow-up calculation process to second vision signal, also can show glibly and can not influence the effect that image shows.
In the above-described embodiment, the video of current demonstration arrival vertical blanking period includes and just arrives vertical blanking period or be in vertical blanking period.Vision signal mentioned above all can be analog signal or digital signal.
In one embodiment, this vision signal is the VGA signal from the VGA video source.The VGA signal is an analog signal, comprises 5 holding wires (R, G, B, H and V) and power supply and ground wire.Wherein, R, G, B are the color signal lines, and H is a line synchronizing signal, and V is a field sync signal.
In this embodiment, switched system 100 further comprises A/D modular converter (not shown) and D/A modular converter (not shown).The A/D modular converter is R, G, B digital signal with the R in the VGA signal, G, B analog signal conversion.R, G, the B digital signal of the VGA signal corresponding to current demonstration (for example VGA signal 20A) that memory module 104 storages are converted to.Receiver module 101 initiates a message after receiving the switching command that the demonstration on the display device 30A switched to VGA signal 20B from VGA signal 20A (but this switching command wireless transmission or by the physical switch transmission).Memory module 104 continues R, G, the B digital signal of storage corresponding to the VGA signal 20A of current demonstration according to this message, and begins to store R, G, B digital signal corresponding to VGA signal 20B to be shown.
It is R, G, the B digital signal that is suitable for showing that computing module 105 utilizes image processing algorithm R, G, the computing of B digital signal of adaptive switched module 103 in the future as interpolation weighting algorithm and weighted average value-based algorithm.
The R that the D/A modular converter obtains computing, G, B digital signal are converted to the VGA signal that is suitable for showing.
In another illustrative embodiments shown in Figure 3, video switching system 100 also can comprise parameter module 106.The parameters that parameter module 106 storage systems are required, and be connected in handover module 103 and computing module 105.Parameter module 106 stored parameters for example can include but not limited to: the resolution of each vision signal and display device and row field information (comprising two picture points of scanning, two row and the time intervals between two) and the vision signal of acquiescence and the corresponding relation of display device etc.Above-mentioned information can be stored in the parameter module 106 in advance, or by outside input unit (for example, mouse, keyboard, remote controller etc.) input.Above-mentioned parameter information also can be made amendment as required by the user.
Be appreciated that when a plurality of display devices show corresponding video signals simultaneously, can switch concurrently and show that every road signal is separate and do not disturb mutually to multi-channel video signal.Like this, under the situation that receives continuously or receive simultaneously corresponding to the order of different display devices and different video signal, above-mentioned each assembly is carried out processing as indicated above and switching concurrently according to each order.
Each assembly in the video switching system mentioned above may be separately formed, and also can be integrated into one or more parts.
Fig. 4 shows the flow chart according to the vision signal changing method 400 of exemplary embodiment of the invention.
According to an illustrative embodiment of the invention, vision signal changing method 400 may further comprise the steps.In step 401, receive the order that switches to second vision signal from first vision signal.In step 402, whether first vision signal that detects current demonstration according to this order arrives vertical blanking period.Arrive vertical blanking period if detect first vision signal, so, in the switching of step 403 execution from first vision signal to second vision signal; Otherwise, continue to carry out detection in step 402.
When whether detection first vision signal arrives vertical blanking period, at first discern the field mark in first vision signal, this field mark is represented the beginning of a field signal.Then,, discern a plurality of effective row in first vision signal, wherein, need the predetermined quantity of the line flag of identification to equal the line number that comprises in the field data by the line flag of identification predetermined quantity.This predetermined quantity can be stored in assigned address in advance and read from this assigned address.For example, capable if a field data of first vision signal comprises N, so, recognize after the field mark in first vision signal, further discern N line display, like this, after recognizing N effective row, then arrive vertical blanking period.Effectively the required time of row can calculate according to the capable field information of signal to show N.Therefore, after recognizing field mark, the N that process calculates effectively the required time of row promptly arrives vertical blanking period.
Fig. 5 shows the flow chart of the video switching method 500 of another illustrative embodiments according to the present invention.
In step 501, receive the order that switches to second vision signal from first vision signal.In step 502, according to these demanded storage first and second vision signals.In step 503, whether second vision signal of detection of stored reaches scheduled volume.This scheduled volume for example is predetermined line number.Reach scheduled volume if detect second vision signal of storage, then whether first vision signal in the current demonstration of step 504 detection arrives vertical blanking period; Otherwise, continue whether to reach scheduled volume in second vision signal of step 503 detection of stored.Arrive vertical blanking period if detect first vision signal, then in the switching of step 505 execution from first vision signal to second vision signal in step 504; Otherwise, continue whether to arrive vertical blanking period in first vision signal of the current demonstration of step 504 detection.
As a kind of selection, this method further comprises, in step 506, with the second vision signal computing of switching for the output signal that is suitable for showing and display device to the outside is provided.The vision signal computing that this computing can will have the different images parameter by various known rapid image Processing Algorithm is the output signal that has the identical image parameter and be suitable for showing.For example, the output signal that obtains of computing is applicable to the resolution of output equipment.The algorithm that is suitable for is interpolation weighting algorithm and weighted average value-based algorithm etc. for example.
In the above-described embodiment, the video of current demonstration arrives vertical blanking period and comprises and just arrive vertical blanking period or be in vertical blanking period.Vision signal mentioned above can be analog signal or digital signal.In one embodiment, this vision signal is the VGA signal.
As indicated above, receiving under the situation of a plurality of orders, a plurality of said process can carry out concurrently without interfering with each other.
Describe the present invention in conjunction with embodiment and embodiment above with reference to accompanying drawing, but, it will be apparent for a person skilled in the art that, can carry out various modifications and distortion to above-mentioned execution mode, and not depart from by claims and be equal to the spirit and scope of the present invention that limit.
Claims (9)
1. video switching system comprises:
Receiver module, it is configured to receive the order that switches to second vision signal from first vision signal of current demonstration, and initiates a message according to described order;
Detection module, it is configured to whether arrive vertical blanking period according to described first vision signal of described message detection, arrives vertical blanking period if detect described first vision signal, and described detection module sends switching command; And
Handover module, it is configured to switch to described second vision signal according to described switching command from described first vision signal.
2. the system as claimed in claim 1 further comprises:
Computing module, it is configured to receive described first vision signal and described second vision signal from described handover module, and with its computing for being suitable for video signal displayed.
3. system as claimed in claim 2 also comprises:
Memory module, it is configured to according to described first and second vision signals of described message stores,
Wherein, whether described detection module also described second vision signal of detection of stored in described memory module reaches scheduled volume, reach scheduled volume if detect described second vision signal of storage, described detection module detects described first vision signal and whether arrives vertical blanking period.
4. system as claimed in claim 2 further comprises:
Parameter module, it is configured to store required parameter and the described computing module of described system's execution acquiescence demonstration and carries out the required parameter of described computing.
5. as each described system in the claim 1 to 4, wherein, described first and second vision signals include the VGA signal.
6. vision signal changing method comprises:
Reception switches to the order of second vision signal from first vision signal of current demonstration;
Detect described first vision signal according to described order and whether arrive vertical blanking period; And
Arrive vertical blanking period if detect described first vision signal, then switch to described second vision signal from described first vision signal.
7. method as claimed in claim 6, described detection step comprises:
Store described first and second vision signals;
Whether described second vision signal of detection of stored reaches scheduled volume; And
If described second vision signal reaches scheduled volume, detect described first vision signal and whether arrive vertical blanking period.
8. method as claimed in claim 7 further comprises:
With the described second vision signal computing of switching for being suitable for video signal displayed.
9. as each described method in the claim 6 to 8, wherein, described first and second vision signals include the VGA signal.
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| CN200910130328A CN101854487A (en) | 2009-03-30 | 2009-03-30 | Video signal switching system and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102223490A (en) * | 2011-06-22 | 2011-10-19 | 上海博康智能网络科技有限公司 | Digital switching matrix supporting synchronic switching and synchronic switching method of digital image |
| CN103458292A (en) * | 2013-08-30 | 2013-12-18 | 小米科技有限责任公司 | Method and device for displaying video data of input source |
| WO2016050106A1 (en) * | 2014-09-30 | 2016-04-07 | 中兴通讯股份有限公司 | Method, device and video conference system for detecting video signals in same standard |
| CN105979196A (en) * | 2016-06-07 | 2016-09-28 | 华为技术有限公司 | Method and device for controlling camera shooting device |
| CN107534724A (en) * | 2015-04-20 | 2018-01-02 | 深圳市大疆创新科技有限公司 | Imaging system |
| CN109495204A (en) * | 2018-11-13 | 2019-03-19 | 深圳市金城保密技术有限公司 | A kind of video information electromagnetic exposure interference method, terminal device and storage medium |
| CN113473082A (en) * | 2021-06-28 | 2021-10-01 | 青岛信芯微电子科技股份有限公司 | Reference monitor and method for switching video mode |
| CN114520883A (en) * | 2020-11-19 | 2022-05-20 | 西安诺瓦星云科技股份有限公司 | Video source switching method and device and video processing equipment |
| WO2022160300A1 (en) * | 2021-01-29 | 2022-08-04 | 华为技术有限公司 | Video switching method and related device |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102223490B (en) * | 2011-06-22 | 2013-04-10 | 博康智能网络科技股份有限公司 | Digital switching matrix supporting synchronic switching and synchronic switching method of digital image |
| CN102223490A (en) * | 2011-06-22 | 2011-10-19 | 上海博康智能网络科技有限公司 | Digital switching matrix supporting synchronic switching and synchronic switching method of digital image |
| CN103458292A (en) * | 2013-08-30 | 2013-12-18 | 小米科技有限责任公司 | Method and device for displaying video data of input source |
| US10063707B2 (en) | 2014-09-30 | 2018-08-28 | Zte Corporation | Method, device and video conference system for detecting video signals in same standard |
| WO2016050106A1 (en) * | 2014-09-30 | 2016-04-07 | 中兴通讯股份有限公司 | Method, device and video conference system for detecting video signals in same standard |
| CN105530444A (en) * | 2014-09-30 | 2016-04-27 | 三亚中兴软件有限责任公司 | Method and apparatus for detecting video signals with same systems and video conference system |
| CN105530444B (en) * | 2014-09-30 | 2019-08-23 | 三亚中兴软件有限责任公司 | Detect the method, apparatus and video conferencing system of the vision signal of identical standard |
| US10979651B2 (en) | 2015-04-20 | 2021-04-13 | SZ DJI Technology Co., Ltd. | Imaging system |
| CN107534724A (en) * | 2015-04-20 | 2018-01-02 | 深圳市大疆创新科技有限公司 | Imaging system |
| CN107534724B (en) * | 2015-04-20 | 2020-09-04 | 深圳市大疆创新科技有限公司 | Imaging system |
| CN105979196B (en) * | 2016-06-07 | 2018-10-30 | 华为技术有限公司 | The method and device that picture pick-up device is controlled |
| CN105979196A (en) * | 2016-06-07 | 2016-09-28 | 华为技术有限公司 | Method and device for controlling camera shooting device |
| CN109495204A (en) * | 2018-11-13 | 2019-03-19 | 深圳市金城保密技术有限公司 | A kind of video information electromagnetic exposure interference method, terminal device and storage medium |
| CN109495204B (en) * | 2018-11-13 | 2021-09-14 | 深圳市金城保密技术有限公司 | Video information electromagnetic leakage interference method, terminal equipment and storage medium |
| CN114520883A (en) * | 2020-11-19 | 2022-05-20 | 西安诺瓦星云科技股份有限公司 | Video source switching method and device and video processing equipment |
| CN114520883B (en) * | 2020-11-19 | 2024-03-15 | 西安诺瓦星云科技股份有限公司 | Video source switching method and device and video processing equipment |
| WO2022160300A1 (en) * | 2021-01-29 | 2022-08-04 | 华为技术有限公司 | Video switching method and related device |
| CN113473082A (en) * | 2021-06-28 | 2021-10-01 | 青岛信芯微电子科技股份有限公司 | Reference monitor and method for switching video mode |
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Application publication date: 20101006 |