CN102655585A - Video conference system and time delay testing method, device and system thereof - Google Patents
Video conference system and time delay testing method, device and system thereof Download PDFInfo
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Abstract
The invention provides a video conference system and a time delay testing method, a time delay testing device and a time delay testing system. The time delay testing method of the video conference system comprises the following steps of: acquiring real-time time information displayed currently by a first video display device and time information in a first image received from a first video conference terminal, wherein the first image contains an image of the real-time time information displayed by the first display device and is returned to the first video display device for displaying after being transmitted by the first conference terminal, a second video conference terminal and the first video conference terminal; and generating time delay information according to the real-time time information and the time information in the first image. According to the video conference system and the time delay testing method, the time delay testing device and the time delay testing system provided by the invention, the test on the time delay of the video conference system is realized, the operation is simple and the implementation is easy.
Description
Technical field
The present invention relates to video conferencing technology, relate in particular to a kind of video conferencing system and time delay measuring method thereof, device and system.
Background technology
Along with rapid development of network technology, video conference has become current multimedia communication mode with fastest developing speed.Traditional commercial affairs, Executive Council are changed to video conference.Video conferencing system is with two or more not comprovincial individual or colony; Through existing various electrical transmission mediums; Multiple data such as personage's quiet, dynamic image, voice, literal, picture are distributed on each user's computer; Make that the user that on geography, disperses can copolymerization one place,, increase the understandability of both sides content through multiple mode exchange of information such as figure, sound.
In the prior art; Video conferencing system generally includes a plurality of video conference terminals, cam device, video display devices and multipoint control unit; The video conference terminal distributed and arranged is on-the-spot in each meeting; Gather the on-the-spot image of meeting to pass through cam device, video display devices shows the image that local image and other video conference terminals collect simultaneously.Because meeting itself ageing when video conferencing system existence during than long time delay, can have a strong impact on the effect of video conference.Therefore, need test, to guarantee carrying out smoothly of video conference to the time delay of video conferencing system.
Summary of the invention
The present invention provides a kind of video conferencing system and time delay measuring method, device and system, to realize the test to the video conferencing system time delay.
First aspect of the present invention provides a kind of time delay measuring method of video conferencing system, comprising:
Obtain the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously; Wherein, Said first image is the image that includes the real-time time information of said first display unit demonstration, returns said first video display devices after said first image transmits via first video conference terminal, said second video conference terminal and said first video conference terminal and shows;
Generate time delay information according to the temporal information in said real-time time information and said first image.
Another aspect of the present invention provides a kind of time delay measuring method of video conferencing system, comprising:
First video display devices shows first image that includes real-time time information, and said first image is sent to first video conference terminal;
Said first video conference terminal sends to second video conference terminal with said first image, and said second video conference terminal sends to said first video conference terminal with said first image;
Said first video conference terminal will send to said first video display devices from said first image that said second video conference terminal receives and show, so that the delay testing device of video conferencing system is according to the real-time time information and the generation of the temporal information from first image that said first video conference terminal receives time delay information of the current demonstration of said first video display devices of obtaining simultaneously.
Another aspect of the present invention provides a kind of delay testing device of video conferencing system, comprising:
The information acquisition module; The temporal information of first image that is used for obtaining simultaneously the real-time time information of the current demonstration of first video display devices and receives from first video conference terminal; Wherein, Said first image is the image that includes the real-time time information of said first display unit demonstration, returns said first video display devices after said first image transmits via first video conference terminal, said second video conference terminal and said first video conference terminal and shows;
Computing module is used for generating time delay information according to the temporal information of said real-time time information and said first image.
Another aspect of the present invention provides a kind of video conferencing system, comprising: first video display devices, first video conference terminal and second video conference terminal;
Said first video display devices is used to show first image that includes real-time time information, and said first image is sent to said first video conference terminal, and will show from said first image that said first video conference terminal receives;
Said first video conference terminal is used for said first image that receives from said first video display devices is sent to second video conference terminal; And will send to said first video display devices from said first image that said second video conference terminal receives, so that the delay testing device of video conferencing system is according to the real-time time information and the generation of the temporal information from first image that said first video conference terminal receives time delay information of the current demonstration of said first video display devices of obtaining simultaneously;
Said second video conference terminal is used for said first image that receives from said first video conference terminal is sent to said first video conference terminal.
Another aspect of the present invention provides a kind of delay testing system of video conferencing system, comprising:
The delay testing device of video conferencing system provided by the invention and video conferencing system provided by the invention.
Can know by technique scheme; Video conferencing system provided by the invention and time delay measuring method thereof, device and system; Obtain real-time time information and the temporal information from first image that first video conference terminal receives that first video display devices shows simultaneously, generate time delay information according to the temporal information in the real-time time information and first image.Because first image is the image that includes the real-time time information of first display unit demonstration; And returning first video display devices after first image transmits via first video conference terminal, second video conference terminal and first video conference terminal shows; First image that promptly generates delayed data is through one of video conferencing system data transfer path back and forth; Temporal information in this first image and real-time time information are compared; Can obtain the time delay of video conferencing system, realize test the video conferencing system time delay.And the time delay measuring method of the video conferencing system that present embodiment provides can realize based on video conferencing system, and simple to operate, is easy to realize.
Description of drawings
The time delay measuring method flow chart of a kind of video conferencing system that Fig. 1 provides for the embodiment of the invention;
The time delay measuring method flow chart of the another kind of video conferencing system that Fig. 2 provides for the embodiment of the invention;
The delay testing apparatus structure sketch map of the video conferencing system that Fig. 3 provides for the embodiment of the invention;
A kind of videoconference system architecture sketch map that Fig. 4 provides for the embodiment of the invention;
The another kind of videoconference system architecture sketch map that Fig. 5 provides for the embodiment of the invention.
Embodiment
The time delay measuring method flow chart of a kind of video conferencing system that Fig. 1 provides for the embodiment of the invention.As shown in Figure 1, the time delay measuring method of the video conferencing system that present embodiment provides specifically can be applied to the testing process to system's time delay of video conferencing system.With the video conferencing system that can realize two side's video conferences is example; This video conferencing system specifically can comprise local video conference terminal, local video display unit and local cam device, and far-end video conference terminal, far-end video display devices and far-end cam device.Local video display unit and local cam device can be arranged on the local video conference terminal, also can be provided with separately, and far-end video display devices and far-end cam device can be arranged on the far-end video conference terminal, also can be provided with separately.Local cam device can adopt high-definition camera; Gather the on-the-spot local image of local meeting; Should show on the local video display unit by this locality image that the local video conference terminal carries out encoding process to local image, and the local image after will encoding sends to the far-end video conference terminal; Local image behind the coding that the far-end video conference terminal will receive carries out decoding processing, and decoded local image is shown on the far-end video display devices.Simultaneously, the cam device of far-end is gathered the on-the-spot distal view picture of far-end meeting, and this distal view picture is shown on the far-end video display devices, then shows local image and distal view picture on the far-end video display devices simultaneously.The far-end video conference terminal looks like to carry out encoding process to distal view; And the distal view after will encoding looks like to send to the local video conference terminal; Distal view behind the coding that the local video conference terminal will receive looks like to carry out decoding processing; And decoded distal view picture shown on the local video display unit, then also show local image and distal view picture on the local video display unit simultaneously.Just can realize carrying out of two side's video conferences through this video conferencing system.
The equipment that the time delay measuring method of the video conferencing system that present embodiment provides can utilize above-mentioned video conferencing system detects the time delay of this video conferencing system, can carry out through the delay testing device.When the time delay to this video conferencing system detects, can this video conferencing system be set to detecting pattern, realize time delay detection to cooperate the delay test device.
The time delay measuring method of the video conferencing system that present embodiment provides specifically comprises:
Step T10, obtain the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously; Wherein, First image is the image that includes the real-time time information of first display unit demonstration, returns first video display devices after first image transmits via first video conference terminal, second video conference terminal and first video conference terminal and shows;
Particularly, first video display devices can be the local video display unit, can be on the local video display unit running timer or counter, to show real-time time information.The precision of timer or counter can be provided with according to the measuring accuracy needs of reality for Millisecond or high accuracy more.First video display devices sends to first video conference terminal with the real-time time frame that includes of its demonstration as first image, and first video conference terminal can be the local video conference terminal.
First video conference terminal can carry out encoding process with first image, and first image after will encoding again sends to second video conference terminal, and second video conference terminal can be the far-end video conference terminal.Second video conference terminal sends to first video conference terminal with this first image again, and then first image that receives of first video conference terminal has passed through one of the video conferencing system data transfer path back and forth.
First video conference terminal sends to first video display devices with this first image and shows; Owing to also show the real-time time information of timer or counter on first video display device; At this moment; Show this real-time time information and this first image on first video display devices simultaneously, also comprise a temporal information in this first image.Because there is certain time delay in this video conferencing system; This time delay possibly be the processing delay of each equipment in the video conferencing system; Also possibly be network delay etc., then there are certain difference in this real-time time information and the temporal information from first image that second video conference terminal returns.
Step T20, generate time delay information according to the temporal information in the real-time time information and first image.
The delay testing device obtains the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously; Particularly; Testing apparatus can be wholely set with this first video display devices; If this real-time time information is produced by timer, then can calculate the gained time value and be time delay information with the difference of the temporal information in the real-time time information and first image divided by 2.If this real-time time information is produced by counter, this counter is counted the corresponding regular hour at every turn, then can calculate to obtain this time delay information according to this corresponding relation.This testing apparatus also can be for having the device of taking the unit; Can take the display image of this first video display devices of unit photographs through this; Take in the image that obtains and comprise this first video display devices images displayed; Can real-time time information in this image and the temporal information in first image be identified, generate time delay information according to the temporal information in the real-time time information and first image again.
In the test process of practical video conference system time delay, when the time delay of testing this video conferencing system surpasses predetermined threshold value, can influence the quality of video conference, then can the split fix test.For example the data transfer path between first video conference terminal and second video conference terminal is a multistage; Then can be with a plurality of test points are set on this data transfer path; So that second video conference terminal to be set respectively; Through test, can know the principal element that causes the video conferencing system time delay to every segment data transmission path.
The time delay measuring method of the video conferencing system that present embodiment provides; Obtain the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously, generate time delay information according to the temporal information in the real-time time information and first image.Because first image is the image that includes the real-time time information of first display unit demonstration; And returning first video display devices after first image transmits via first video conference terminal, second video conference terminal and first video conference terminal shows; First image that promptly generates delayed data is through one of video conferencing system data transfer path back and forth; Temporal information in this first image and real-time time information are compared; Can obtain the time delay of video conferencing system, realize test the video conferencing system time delay.And the time delay measuring method of the video conferencing system that present embodiment provides can realize based on video conferencing system, and is simple to operate, is easy to realize.And in implementation procedure; Two temporal informations that show through first video display devices that obtains are more simultaneously confirmed the time-delay of video conferencing system; Avoided through timestamp during the nominal time; Because timestamp generation device and timestamp obtain the inconsistent situation of the different judgment standards that cause of clock frequency, sample frequency of analytical equipment, and come the nominal time through timestamp, the implementation complexity height.
In the present embodiment, step T10 obtains the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously, specifically can comprise the steps:
Step T101, the 3rd image of first image that includes real-time time information and receive from first video conference terminal of gathering that first video display devices shows;
Real-time time information in step T102, extraction the 3rd image and the temporal information in first image in the 3rd image.
Can at first discern real-time time information and the temporal information in first image in the 3rd image in the 3rd image, and above-mentioned information is extracted.Image recognition can be adopted the image-recognizing method based on eigenmatrix, also can adopt the image-recognizing method based on wavelet transformation, with realization two temporal informations in the 3rd image is identified to get final product, and does not exceed with present embodiment.
In the present embodiment, step T20 generates time delay information according to the temporal information in the real-time time information and first image, specifically can comprise the steps:
The difference of the temporal information in the real-time time information and first image divided by 2, is generated delayed data.
The time delay measuring method flow chart of the another kind of video conferencing system that Fig. 2 provides for the embodiment of the invention.As shown in Figure 2; The time delay measuring method of the video conferencing system that the time delay measuring method of the video conferencing system that present embodiment provides specifically can provide with the foregoing description cooperates the delay testing of realizing video conferencing system; Its concrete implementation procedure and the foregoing description are said similar, and this repeats no more.
The time delay measuring method of the video conferencing system that present embodiment provides specifically comprises:
Step S10, first video display devices show first image that includes real-time time information, and first image is sent to first video conference terminal;
Step S20, first video conference terminal send to second video conference terminal with first image, and second video conference terminal sends to first video conference terminal with first image;
Step S30, first video conference terminal will send to first video display devices from first image that second video conference terminal receives and show, so that the delay testing device is according to the real-time time information and the generation of the temporal information from first image that first video conference terminal receives time delay information of the current demonstration of first video display devices of obtaining simultaneously.
The time delay measuring method of the video conferencing system that present embodiment provides; First video display devices shows first image that includes real-time time information; First image is sent to first video conference terminal; First video conference terminal sends to second video conference terminal with first image; Second video conference terminal sends to first video conference terminal with first image, and first video conference terminal will send to first video display devices from first image that second video conference terminal receives and show.Because first video display devices has shown real-time time information and first image that receives from first video conference terminal simultaneously; First image is through one of video conferencing system data transfer path back and forth; Temporal information and real-time time information in can this first image compare; To obtain the time delay of video conferencing system, realize test to the video conferencing system time delay.And the time delay measuring method of the video conferencing system that present embodiment provides can realize based on video conferencing system, and simple to operate, is easy to realize.
In practical video conference system application process; The local video conference terminal in the video conferencing system and the coding parameter of far-end video conference terminal are not simultaneously; In this video conferencing system multipoint control unit can also be set; This multipoint control unit can pass through micro-control unit (Micro Control Unit is called for short MCU) and realize that this multipoint control unit is realized the adaptive of local video conference terminal and far-end video conference terminal.When having a plurality of video conference terminal in the video conferencing system, this multipoint control unit can also be realized the control to a plurality of video conference terminals.Then in the present embodiment, step S20, first video conference terminal sends to second video conference terminal with first image, and second video conference terminal sends to first video conference terminal with first image, specifically comprises the steps:
Step S201, first video conference terminal send to multipoint control unit with first image, and multipoint control unit sends to second video conference terminal with first image;
Step S202, second video conference terminal send to multipoint control unit with first image, and multipoint control unit sends to first video conference terminal with first image.
Particularly, multipoint control unit can carry out the image that receives to redispatch after the corresponding adaptation processing, and its processing procedure can adopt the adaptation method of prior art to realize that this repeats no more.
In the present embodiment, second video conference terminal among the step S20 sends to first video conference terminal with first image, comprising:
Step S203, second video conference terminal send to second video display devices with first image and show that cam device is gathered second image that includes first image that second video display devices shows, second image is sent to second video conference terminal;
Step S204, second video conference terminal send to first video conference terminal with second image;
Correspondingly, step S30, first video conference terminal will send to first video display devices from first image that second video conference terminal receives and show, comprise:
First video conference terminal will send to first video display devices from second image that second video conference terminal receives and show.
Particularly; Second video display devices is the far-end video display devices; Cam device is the far-end cam device; Second video display devices shows this first image, and cam device is gathered second video display devices institute images displayed as second image, includes first image in this second image.Utilize far-end cam device and far-end video display devices to cooperate the passback that realizes first image, can utilize existing video conference flow process, further reduced the complexity that test realizes.
First video conference terminal sends to first video display devices with second image and show that owing to include first image in this second image, then this first image also can show on first video display devices.
The delay testing apparatus structure sketch map of the video conferencing system that Fig. 3 provides for the embodiment of the invention.As shown in Figure 3, the delay testing device of the video conferencing system that present embodiment provides specifically can be realized each step of the time delay measuring method of the video conferencing system that is applied to the delay testing device side that any embodiment of the present invention provides, and this repeats no more.
The delay testing device of the video conferencing system that present embodiment provides specifically comprises information acquisition module 11 and computing module 12.Information acquisition module 11 is used for obtaining simultaneously the real-time time information of the current demonstration of first video display devices and the temporal information of first image that receives from first video conference terminal; Wherein, First image is the image that includes the real-time time information of first display unit demonstration, returns first video display devices after first image transmits via first video conference terminal, second video conference terminal and first video conference terminal and shows.Computing module 12 is used for generating time delay information according to the temporal information of the real-time time information and first image.
The delay testing device of the video conferencing system that present embodiment provides; Information is obtained real-time time information and the temporal information from first image that first video conference terminal receives that 11 modules are obtained the current demonstration of first video display devices simultaneously, and computing module 12 generates time delay information according to the temporal information in the real-time time information and first image.Because first image is the image that includes the real-time time information of first display unit demonstration; And returning first video display devices after first image transmits via first video conference terminal, second video conference terminal and first video conference terminal shows; First image that promptly generates delayed data is through one of video conferencing system data transfer path back and forth; Temporal information in this first image and real-time time information are compared; Can obtain the time delay of video conferencing system, realize test the video conferencing system time delay.And the time delay measuring method of the video conferencing system that present embodiment provides can realize based on video conferencing system, and simple to operate, is easy to realize.
In the present embodiment, information acquisition module 11 specifically can comprise shooting unit and information extraction unit.Take the unit and be used to gather that first video display devices shows includes real-time time information and the 3rd image of first image that receives from first video conference terminal.Information extraction unit is used for extracting the real-time time information of the 3rd image and the temporal information in first image in the 3rd image.Through taking the setting of unit, can obtain first video display devices institute images displayed easily, reduced the realization difficulty of delay testing.
In the present embodiment, computing module 12 specifically can also be used for difference with the temporal information of the real-time time information and first image divided by 2, generates delayed data.
A kind of videoconference system architecture sketch map that Fig. 4 provides for the embodiment of the invention.As shown in Figure 4, the video conferencing system that present embodiment provides specifically can realize each step of the time delay measuring method of the video conferencing system that is applied to the video conferencing system side that any embodiment of the present invention provides, and this repeats no more.The video conferencing system 81 that present embodiment provides specifically comprises first video display devices 21, first video conference terminal 22 and second video conference terminal 23.First video display devices 21 is used to show first image that includes real-time time information, and first image is sent to first video conference terminal 22, and will show from first image that first video conference terminal 22 receives.First video conference terminal 22 is used for first image that receives from first video display devices 21 is sent to second video conference terminal 23; And will send to first video display devices 21 from first image that second video conference terminal 23 receives, so that delay testing device 82 is according to the real-time time information and the generation of the temporal information from first image that first video conference terminal 22 the receives time delay information of first video display devices, the 21 current demonstrations of obtaining simultaneously.Second video conference terminal 23 is used for first image that receives from first video conference terminal 22 is sent to first video conference terminal 22.
Particularly, this video conferencing system 81 can comprise various modes, like mode of operation and detecting pattern.When video conferencing system is in mode of operation, can realize normal video conference flow process.When video conferencing system 81 is in detecting pattern, can cooperate the delay testing of realizing this video conferencing system 81 with delay testing device 82.
The video conferencing system 81 that present embodiment provides; First video display devices 21 shows first image that includes real-time time information; First image is sent to first video conference terminal 22; First video conference terminal 22 sends to second video conference terminal 23 with first image; Second video conference terminal 23 sends to first video conference terminal, 22, the first video conference terminals 22 with first image will send to 21 demonstrations of first video display devices from first image that second video conference terminal 23 receives.Because first video display devices 21 has shown real-time time information and first image that receives from first video conference terminal 22 simultaneously; First image is through one of video conferencing system data transfer path back and forth; Temporal information and real-time time information in can this first image compare; To obtain the time delay of video conferencing system, realize test to the video conferencing system time delay.And the time delay measuring method of the video conferencing system that present embodiment provides can realize based on video conferencing system, and simple to operate, is easy to realize.
The another kind of videoconference system architecture sketch map that Fig. 5 provides for the embodiment of the invention.As shown in Figure 5; In the present embodiment; This video conferencing system 81 specifically can also comprise multipoint control unit 24; Multipoint control unit 24 is arranged between first video conference terminal 22 and second video conference terminal 23, is used for first image that receives from first video conference terminal 22 is sent to second video conference terminal 23, and sends to first video conference terminal 22 from first image that second video conference terminal 23 receives; Correspondingly, first video conference terminal 22 also is used for first image that receives from first video display devices 21 is sent to multipoint control unit 24, and will send to first video display devices 21 from first image that multipoint control unit 24 receives.Second video conference terminal 23 also is used for first image that receives from multipoint control unit 24 is sent to multipoint control unit 24.
In the present embodiment, this video conferencing system 81 specifically can also comprise second video display devices 25 and cam device 26.Second video display devices 25 is used for first image that receives from second video conference terminal 23 is shown.Cam device 26 is used to gather second image that includes first image that second video display devices 25 shows, second image is sent to second video conference terminal 23.Correspondingly, second video conference terminal 23 also is used for first image that receives from first video conference terminal 22 is sent to second video display devices 25, and will send to first video conference terminal 22 from second image that cam device 26 receives.First video conference terminal 22 is used for that also second image is sent to first video display devices 21 and shows.Utilize the cam device 26 and second video display devices 25 to cooperate the passback that realizes first image, can utilize existing video conference flow process, further reduced the complexity that test realizes.
Present embodiment provides a kind of delay testing system of video conferencing system; The delay testing system of this video conferencing system comprises the delay testing device of the video conferencing system that any embodiment of the present invention provides and the video conferencing system that any embodiment of the present invention provides.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (13)
1. the time delay measuring method of a video conferencing system is characterized in that, comprising:
Obtain the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously; Wherein, Said first image is the image that includes the real-time time information of said first display unit demonstration, returns said first video display devices after said first image transmits via first video conference terminal, said second video conference terminal and said first video conference terminal and shows;
Generate time delay information according to the temporal information in said real-time time information and said first image.
2. the time delay measuring method of video conferencing system according to claim 1; It is characterized in that; Obtain the real-time time information and the temporal information from first image that first video conference terminal receives of the current demonstration of first video display devices simultaneously, comprising:
The 3rd image of said first image that includes said real-time time information and receive from said first video conference terminal of gathering that said first video display devices shows;
Extract said real-time time information and the temporal information in first image in said the 3rd image in said the 3rd image.
3. the time delay measuring method of video conferencing system according to claim 1 and 2 is characterized in that, generates time delay information according to the temporal information in said real-time time information and said first image, comprising:
The difference of the temporal information in said real-time time information and said first image divided by 2, is generated said delayed data.
4. the time delay measuring method of a video conferencing system is characterized in that, comprising:
First video display devices shows first image that includes real-time time information, and said first image is sent to first video conference terminal;
Said first video conference terminal sends to second video conference terminal with said first image, and said second video conference terminal sends to said first video conference terminal with said first image;
Said first video conference terminal will send to said first video display devices from said first image that said second video conference terminal receives and show, so that the delay testing device is according to the real-time time information and the generation of the temporal information from first image that said first video conference terminal receives time delay information of the current demonstration of said first video display devices of obtaining simultaneously.
5. the time delay measuring method of video conferencing system according to claim 4; It is characterized in that; Said first video conference terminal sends to second video conference terminal with said first image; Said second video conference terminal sends to said first video conference terminal with said first image, comprising:
Said first video conference terminal sends to multipoint control unit with said first image, and said multipoint control unit sends to said second video conference terminal with said first image;
Said second video conference terminal sends to multipoint control unit with said first image, and said multipoint control unit sends to said first video conference terminal with said first image.
6. the time delay measuring method of video conferencing system according to claim 4 is characterized in that:
Said second video conference terminal sends to said first video conference terminal with said first image, comprising:
Said second video conference terminal sends to second video display devices with said first image and shows; Cam device is gathered second image that includes said first image that said second video display devices shows, said second image is sent to said second video conference terminal;
Said second video conference terminal sends to said first video conference terminal with said second image;
Correspondingly, said first video conference terminal will send to said first video display devices from said first image that said second video conference terminal receives and show, comprise:
Said first video conference terminal will send to said first video display devices from said second image that said second video conference terminal receives and show.
7. the delay testing device of a video conferencing system is characterized in that, comprising:
The information acquisition module; The temporal information of first image that is used for obtaining simultaneously the real-time time information of the current demonstration of first video display devices and receives from first video conference terminal; Wherein, Said first image is the image that includes the real-time time information of said first display unit demonstration, returns said first video display devices after said first image transmits via first video conference terminal, said second video conference terminal and said first video conference terminal and shows;
Computing module is used for generating time delay information according to the temporal information of said real-time time information and said first image.
8. the delay testing device of video conferencing system according to claim 7 is characterized in that, said information acquisition module comprises:
Take the unit, be used to gather that said first video display devices shows includes said real-time time information and the 3rd image of said first image that receives from said first video conference terminal;
Information extraction unit is used for extracting the said real-time time information of said the 3rd image and the temporal information in first image in said the 3rd image.
9. according to the delay testing device of claim 7 or 8 described video conferencing systems, it is characterized in that: said computing module also is used for difference with the temporal information of said real-time time information and said first image divided by 2, generates said delayed data.
10. a video conferencing system is characterized in that, comprising: first video display devices, first video conference terminal and second video conference terminal;
Said first video display devices is used to show first image that includes real-time time information, and said first image is sent to said first video conference terminal, and will show from said first image that said first video conference terminal receives;
Said first video conference terminal is used for said first image that receives from said first video display devices is sent to second video conference terminal; And will send to said first video display devices from said first image that said second video conference terminal receives, so that the delay testing device is according to the real-time time information and the generation of the temporal information from first image that said first video conference terminal receives time delay information of the current demonstration of said first video display devices of obtaining simultaneously;
Said second video conference terminal is used for said first image that receives from said first video conference terminal is sent to said first video conference terminal.
11. video conferencing system according to claim 10; It is characterized in that: also comprise multipoint control unit; Said multipoint control unit is arranged between said first video conference terminal and said second video conference terminal; Be used for and send to said second video conference terminal from said first image that said first video conference terminal receives, and send to said first video conference terminal from said first image that said second video conference terminal receives; Correspondingly,
Said first video conference terminal also is used for said first image that receives from said first video display devices is sent to said multipoint control unit, and will send to said first video display devices from said first image that said multipoint control unit receives;
Said second video conference terminal also is used for said first image that receives from said multipoint control unit is sent to said multipoint control unit.
12. video conferencing system according to claim 10 is characterized in that: also comprise second video display devices and cam device;
Said second video display devices is used for said first image that receives from said second video conference terminal is shown;
Said cam device is used to gather second image that includes said first image that said second video display devices shows, said second image is sent to said second video conference terminal; Correspondingly,
Said second video conference terminal also is used for first image that receives from said first video conference terminal is sent to said second video display devices, and will send to said first video conference terminal from said second image that said cam device receives;
Said first video conference terminal is used for that also said second image is sent to said first video display devices and shows.
13. the delay testing system of a video conferencing system is characterized in that, comprising:
Like the delay testing device of the arbitrary described video conferencing system of claim 7-9 with like the arbitrary described video conferencing system of claim 10-12.
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