CN109274921A - Video conferencing system - Google Patents
Video conferencing system Download PDFInfo
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- CN109274921A CN109274921A CN201810844602.3A CN201810844602A CN109274921A CN 109274921 A CN109274921 A CN 109274921A CN 201810844602 A CN201810844602 A CN 201810844602A CN 109274921 A CN109274921 A CN 109274921A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Telephonic Communication Services (AREA)
Abstract
The invention discloses a kind of video conferencing systems, include: at least two video conference terminals, video flowing transmission are carried out between each video conference terminal, wherein each video conference terminal includes；One for acquiring the image collecting device of participant's stereo-picture；One for acquiring the video acquisition device of participant's video information；One for acquiring the voice acquisition device of participant's voice messaging；One for showing the display device of participant's stereo-picture；One for playing the video play device of participant's video information；One for playing the voice playing device of participant's voice messaging.The present invention is based on the projection of no medium floating, utilize software and combination of hardware, personnel in Remote Video Conference are really restored in the presence of, and realize that picture carrys out real-time change with the position and angle of eyes of user, to enhance the sense of reality, user is allowed to feel the personnel of Remote Video Conference in the offering.
Description
Technical field
The present invention relates to video conferencing technology fields, and in particular to a kind of video conferencing system.
Background technique
With the development of science and technology and social progress, the networking of modern video conference system is video conferencing system from now on
One trend of development.It is understood that network promptly can quickly be transmitted various information.The video conference of the prior art
Its core function of system is: multi-person speech chat, multi-video chat, common electronic blank and the management of meeting room etc..And its
In Video chat then shown by display usually using camera collection image.This mode is While it can be seen that right
Face, but people cannot be allowed to have true feeling at one's side vividly.
Summary of the invention
The purpose of the present invention is to provide a kind of video conferencing systems to utilize software based on the projection of no medium floating
With combination of hardware, the personnel in Remote Video Conference are really restored in the presence of, and realize picture with the position of eyes of user
And angle carrys out real-time change, to enhance the sense of reality, user is allowed to feel the personnel of Remote Video Conference in the offering.
In order to achieve the above object, the invention is realized by the following technical scheme: a kind of video conferencing system, feature
It is to include:
At least two video conference terminals carry out video flowing transmission between each video conference terminal, wherein each video conference is whole
End includes；
One for acquiring the image collecting device of participant's stereo-picture；
One for acquiring the video acquisition device of participant's video information；
One for acquiring the voice acquisition device of participant's voice messaging；
One for showing the display device of participant's stereo-picture；
One for playing the video play device of participant's video information；
One for playing the voice playing device of participant's voice messaging.
In the above scheme, described image acquisition device includes:
Whole camera module, for acquiring the plane and depth information of the two parties in video conversation；
The entirety camera module includes depth camera, vertical cavity surface emitting laser and infrared camera.
In the above scheme, the video acquisition device includes:
Camera, for acquiring each frame video image of participant；
Video encoding module, for encoding each frame video image；
Video sending module, the video image after being used for transmission coding；Wherein
The video encoding module is also used to the clarity that dynamic adjusts video；
The video sending module is also used to abandon video frame automatically.
In the above scheme, the voice acquisition device includes:
Microphone, for acquiring audio data；
Voice coding module is used for coded audio data, in favor of transmission；
Voice sending module, for transmitting the audio data after coding；Wherein
The voice coding module is also used to carry out audio data at noise suppressed processing, jitter buffer processing and mute detection
Reason.
In the above scheme, the display device includes:
Image synthesis and output module, for synthesizing the 3D solid mould of a personage according to the collected picture of different angle
Then type determines the 3D that current sight and face orientation are seen by detection user sight at this time and face's azimuth information
Three-dimensional model picture is to export；
Include an optical element without medium floating projection module, so that the light of incident image is generated bending, light is in optical element
It is middle after at least 2 secondary reflections, form corresponding with incident image mid-air real image.
In the above scheme, described image synthesis includes with output module:
Feature Points Matching unit, for finding the image section shared in acquired image；
Image matching unit estimates the transformation of geometric aspects between image for the characteristic point of matching connection；
Panorama sketch resistance straightening unit is rotated for correcting relative to 3D；
Image equalization compensating unit, for the global illumination for balancing all images and tone；
Image frequency range integrated unit is merged for image frequency range, is connected edge, halation effect and parallax effect between image to eliminate
Fruit.
In the above scheme, the optical element is SMA optical element or DCRA optical element.
In the above scheme, the video play device includes:
Video reception module, for receiving the video image after encoding；
Video decoding module, for being decoded to the video image after coding；
Desktop display, for showing decoded video image.
In the above scheme, the voice playing device includes:
Speech reception module, for receiving the audio data after encoding；
Tone decoding module, for being decoded to the audio data after coding；
Sound card, for the audio data after broadcast decoder.
In the above scheme, the voice playing device also includes:
Echo cancellation module does counteracting operation according to the audio frame that has just played in the audio frame of acquisition, by echo from acquisition
It is disposed in frame；
Multi-path voice is mixed into all the way by mix module.
A kind of video conferencing system of the present invention has the advantage that compared with prior art
The meeting room use that conference system of the invention can not only apply to air-borne imagery, also can be applied to not air-borne imagery
Display screen replaces air-borne imagery and VR；
It is projected out virtual screen in the sky without medium, saves space；Sight can pass through, will not shelter from sight influence user with
The personnel transfer on opposite；The facial information of remote personnel can be acquired in real time, and according to the position of eyes of user and angle come real
When adjust the content that project without medium floating, the enhancing sense of reality allows user to have a kind of feeling of long-distance video personnel in the offering；
No medium floating projects the system and content no requirement (NR) to host, and system can be Window, Android, IOS etc., and content can
To be 2D or 3D, the compatibility human-computer interaction convenient for combining constructed in hardware new by force；Rich in technology sense, completely new vision is brought
And the experience of interaction.
Detailed description of the invention
Fig. 1 is the overall structure block diagram of video conference terminal in the present invention；
Fig. 2 is the signal flow schematic diagram of the video conferencing system of one embodiment of the invention；
Fig. 3 is the application scenario diagram of the video conferencing system of one embodiment of the invention.
Specific embodiment
The embodiment for embodying feature of present invention and advantage will describe in detail in the explanation of back segment.It should be understood that the present invention
Can have various variations in different examples, neither depart from the scope of the present invention, and it is therein explanation and be shown in
Substantially regard purposes of discussion, rather than to limit the present invention.
The embodiment of the invention discloses a kind of video conferencing systems, as shown in Figure 1, comprising: at least two video conferences are whole
End 10 carries out video flowing transmission between each video conference terminal, wherein each video conference terminal 10 includes；One for acquiring
The image collecting device 100 of participant's stereo-picture；One for acquiring the video acquisition device 200 of participant's video information；One
For acquiring the voice acquisition device 300 of participant's voice messaging；One for showing the display device of participant's stereo-picture
400；One for playing the video play device 500 of participant's video information；One for playing the voice of participant's voice messaging
Playing device 600.
In embodiments of the present invention, as an implementation, as shown in Figure 1, described image acquisition device 100 includes:
Whole camera module 101, for acquiring the plane and depth information of the two parties in video conversation；The entirety camera
Mould group 101 includes depth camera 1011, vertical cavity surface emitting laser 1012 and infrared camera 1013.
For convenience, the present invention is described by taking the user of two video conferences as an example, including user A and user B.
Those skilled in the art can refer to the example of two users it should be understood that when comprising multiple users, in conjunction with Fig. 2 and
Shown in Fig. 3.
In embodiments of the present invention, as a kind of specific example, using multiple and different angles by depth camera, vertical
Cavity surface emitting lasers (Vertical Cavity Surface Emitting Laser, VCSEL), infrared camera form
Whole camera module carries out adopting for plane and depth information to the user B of user A and distance communicating in video conference
Collection detects the eyes and face orientation of active user A, according to the eyes of user A and face orientation come with the letter that collects user B
Breath synthesizes face's content with the user B of his video conference in the air in real time, and user A can be allowed to feel the user B of teleconference just
It is before eyes, face's content with his visual angle mobile real-time change, though can also be by face's content user's A sight of user B
It moves and follows.
In embodiments of the present invention, depth camera can use structure light (Structured Light), TOF(Time
One of Of Flight) and binocular imaging (Stereo System).
Specifically, it after the specific optical information to body surface of project structured light, is acquired by camera.According to caused by object
The information such as position and the depth for changing to calculate object of optical signal, and then restore entire three-dimensional space.
TOF system is a kind of optical detection and ranging system, can emit light pulse from emitter to object, receiver can then pass through meter
Calculate light pulse from transmitter to object, then with pixel format back to receiver runing time come determine measured object away from
From.
Binocular imaging shoots object using dual camera, then calculates object distance by Triangle Principle.
In embodiments of the present invention, as a kind of specific example, 3D sensing technology is utilized and uses VCSEL as red
Outer light source becomes 3D camera, wherein VCSEL is one of light source used by optical-fibre communications.VCSEL is different from LED (luminous two
Pole pipe) and other light sources such as LD (Laser Diode, laser diode), VCSEL light source can modulation frequency just reach several Giga Hz,
Transmission rate naturally also has Giga bps grade.In addition driving voltage needed for VCSEL and electric current very little, so that the service life has ten million
Hour or more, it is 100 times or more of other light sources.OPEAK module/desk-top VCSEL light source is a kind of high stable, high performance-price ratio light
Source.Optical power ensure that using automatic precision temperature control (ATC) and power control (APC) technology and compose the long-term steady of shape
It is fixed.Single mode optical fiber output, choosing multiple style connector or adapter, the convenient quick low-loss with external equipment, quickly
Interconnection.Output optical power is adjustable, optional internal modulation mode.
In embodiments of the present invention, as a kind of specific example, photosensitive infrared camera is infrared ray, and VCSEL issues red
Object is irradiated in outside line, and infrared ray is received by diffusing reflection by infrared camera, forms video image.
In embodiments of the present invention, as an implementation, as shown in Figure 1, the video acquisition device 200 includes:
Camera 201, for acquiring each frame video image of participant；Video encoding module 202, for encoding each frame video figure
Picture；Video sending module 203, the video image after being used for transmission coding；Wherein, the video encoding module 202 is also used to move
The clarity of state adjustment video；The video sending module 203 is also used to abandon video frame automatically.
In embodiments of the present invention, as a kind of specific example, the collected each frame video image of camera is captured.?
In windows system, realized usually using VFW technology or DirectShow technology.Acquisition video two key parameters be
Frame frequency (fps) and resolution ratio.
In general, a camera can support a variety of different acquisition resolutions and acquisition frame frequency, and different take the photograph
As the set of the resolution ratio of head support is different.For example the 1920*1080 of 30fps can be supported now with many high-definition cameras
Image Acquisition.
In embodiments of the present invention, as a kind of specific example, video encoding module is used for compressed video image, while
Determine the clarity of image.The common technology of Video coding be H.263, H.264, MPEG-4, XVID etc..
In embodiments of the present invention, as a kind of specific example, video encoding module dynamic adjusts the clarity packet of video
Contain: on internet, network speed is real-time dynamic change, so, in video conference, in order to preferentially guarantee voice
Speech quality needs to adjust the relevant parameter of video in real time, and most important is exactly the clarity of adjustment coding, because of clarity
Higher, higher to bandwidth requirement, vice versa.For example, when detecting network busy, it is just automatic to reduce the clarity encoded, with
Reduce the occupancy to bandwidth.
In embodiments of the present invention, as a kind of specific example, video sending module abandons video frame automatically and includes: network
It is exactly sender is actively to abandon the video frame to be sent in this way in recipient to be exactly there are one method when busy
Frame frequency fps is reduced.
In embodiments of the present invention, as an implementation, as shown in Figure 1, the voice acquisition device 300 includes:
Microphone 301, for acquiring audio data；Voice coding module 302 is used for coded audio data, in favor of transmission；Voice hair
Module 303 is sent, for transmitting the audio data after coding；Wherein, the voice coding module 302 is also used to audio
Data carry out noise suppressed processing, jitter buffer processing and mute detection processing.
In video conference, voice-over-net is conversed usual multi-to-multi, can be with single direction for link process
It discusses, the one-to-one each key link of model spoken includes the following contents:
Audio data is acquired from microphone, i.e. sample sound is converted into digital signal.It is related to several important parameters: sampling
Frequency, sampling resolution, channel number.
Voice coding can compress the transmission bandwidth of voice signal, increase the transmission rate of channel.Have at present many common
Speech coding technology, as G.729, iLBC, AAC, SPEEX etc..After an audio frame completes coding, network can be passed through
It is sent to the other side of call.Realtime such for voice dialogue application, low latency and is steadily very important, this will
Ask our transmission of network very smooth.
One speech dialogue system being applied on wide area network to work well should also have following functional requirement: low
Delay, background noise is small, and sound is smooth, without card, the feeling of pause.
After other side receives coded frame, it can be decoded, to be restored to the data directly played for sound card.
After completing decoding, obtained audio frame can be submitted to sound card and played out.
It needs to do voice following processing for above several functions:
The characteristics of noise suppressed, also known as noise reduction process are according to voice data, the part for belonging to background noise is identified
Come, and is filtered out from audio frame.There is all built-in function of many audio coding modules.
Jitter-buffer (JitterBuffer) is used for the problem of solving network jitter.So-called network jitter is exactly network
Delay is for a moment big for a moment small, in this case, even if sender is to regularly send data packet (for example every 100ms sends one
A packet), and the reception of recipient just can not equally timing, a packet does not all receive in the sometimes one period, sometimes one
Several packets are received in period.In this way, the sound for causing recipient to hear is exactly a card.JitterBuffer work
Link after making in audio decoder module, before voice broadcasting.I.e. after the completion of tone decoding, decoding frame is put into
JitterBuffer takes out an oldest frame from JitterBuffer and plays out when arrival is adjusted back in the broadcasting of sound card.
The buffer depth of JitterBuffer depends on the degree of network jitter, and network jitter is bigger, and buffer depth is bigger, plays audio
Delay it is bigger.So JitterBuffer is the smooth playing that higher delay is utilized to exchange sound for, because of phase
For one card of sound, slightly bigger delay but more smooth effect, subjective experience will be more preferably.Certainly,
The buffer depth of JitterBuffer is not constant always, and according to the variation of network jitter degree, dynamic is adjusted.
When network recovery to it is very steady unobstructed when, buffer depth can be very small, the increased broadcasting because of JitterBuffer in this way
Delay can ignore.
Mute detection is generally also integrated in audio coding module.The noise suppressed of mute detection algorithm combination front is calculated
Method can identify currently whether there is voice input, if inputted without voice, so that it may coding one special volume of output
Code frame (for example length is 0).Especially in more people's video conferences, there is usually one people to make a speech, and in this case, utilizes
Mute detection technique can save bandwidth.
In embodiments of the present invention, as an implementation, as shown in Figure 1, the display device 400 includes: image
Synthesis and output module 401, for synthesizing the 3D three-dimensional model of a personage according to the collected picture of different angle, then
The 3D solid mould that current sight and face orientation are seen is determined with face's azimuth information by the sight of detection user at this time
Type picture is to export；Include an optical element without medium floating projection module 402, the light of incident image made to generate bending,
Light after at least 2 secondary reflections, forms mid-air real image corresponding with incident image in optical element.
In embodiments of the present invention, as an implementation, no medium floating projection module 402 also includes human-computer interaction
Unit 4021, user can interact in the aerial of no medium, such as utilize one infrared laser mould of installation on optical element
Block forms the black light film for being higher than 1~3mm of image, thickness about 1mm in floating image plane, and it is fixed that camera passes through
Position software obtains the coordinate point location air-borne imagery picture of picture in the sky, when finger or any opaque object contact sky
When middle imaging picture, the signal receiver that light is reflected to, then by being accurately calculated to optoelectronic position, obtain in one's hands
The coordinate of gesture carries out touch-control in the sky.
In embodiments of the present invention, as a specific example, described image synthesis includes with output module 401: feature
Point matching unit 4011, for finding the image section shared in acquired image；Image matching unit 4012, for connecting
Matched characteristic point estimates the transformation of geometric aspects between image；Panorama sketch resistance straightening unit 4013 is rotated for correcting relative to 3D
(rotating relative to 3D for camera), main cause are that shooting picture phase machine is likely to not in the same horizontal line, and is existed
Different degrees of inclination, skips over this step and may cause panorama sketch and become wave-like；Image equalization compensating unit 4014, is used for
The overall situation balances illumination and the tone of all images；Image frequency range integrated unit 4015 is merged for image frequency range, to eliminate image
Between be connected edge, halation effect (brightness of the peripheral part of image or saturation degree are lower than central area) and parallax effect (because
Cause for camera lens movement).
In embodiments of the present invention, as an implementation, the optical element is SMA optical element or DCRA optics
Element.
Specifically, SMA optical element is to form band-like planar light side by side with certain spacing in the inside of transparent plate
The first photocontrol panel, the second photocontrol panel of reflecting part are light-operated with the planar light reflective portion of the first photocontrol panel and second
The optical imaging device that the mode that the planar light reflective portion of panel processed intersects is oppositely disposed, the DCRA optical element are by 100 μ
The optical element that the microscopic mirrors of m size are composed.Using no medium floating shadow casting technique, any medium is not needed, it can be
There is no the aerial of anything, the image of proper business occur, are easy to implement brand-new no medium floating projection man-machine interactive system.
In embodiments of the present invention, as a specific example, display is placed upside down in DCRA optical element or SMA optics
Below element, virtual screen is formed in the sky, then the acquisition using camera module to image information carries out image with software
The output of synthesis, face image of the synthesis in real time with another of user's sight and face's Orientation differences with his video conference.
In embodiments of the present invention, as an implementation, as shown in Figure 1, the video play device 500 includes:
Video reception module 501, for receiving the video image after encoding；Video decoding module 502, for the video figure after coding
As being decoded；Desktop display 503, for showing decoded video image.
Specifically, after other side receives the video frame of coding, it can be decoded, to revert to a frame image, so
It is drawn out on the interface of UI afterwards.
In embodiments of the present invention, as a specific example, desktop display is desktop intelligent terminal or liquid crystal
Show device.
In embodiments of the present invention, as an implementation, as shown in Figure 1, the voice playing device 600 includes:
Speech reception module 601, for receiving the audio data after encoding；Tone decoding module 602, for the audio number after coding
According to being decoded；Sound card 603, for the audio data after broadcast decoder.
One speech dialogue system being applied on wide area network to work well should also be without echo, and realizes multipair
More voice communications.
In embodiments of the present invention, preferably, the voice playing device 600 also includes: echo cancellation module 604,
According to the audio frame just played, counteracting operation is done in the audio frame of acquisition, echo is disposed from acquisition frame；Audio mixing mould
Block 605, multi-path voice is mixed into all the way.
Specifically, the principle of echo cancellation is echo cancellation module according to the audio frame just played, in the audio frame of acquisition
In do some similar operations offset, so that echo be disposed from acquisition frame.This process is considerably complicated, because it
The size in locating room and your position in a room are related when also chatting with you, because these information determine sound wave
The duration of reflection.The echo cancellation module of intelligence, is adapted dynamically inner parameter, with the current environment of optimal adaptation.
In embodiments of the present invention, in video conference, when more people make a speech simultaneously, it would be desirable to while playing from more
Personal voice data, and the buffer area that sound card plays only one, it is therefore desirable to which multi-path voice is mixed into all the way, this is just
It is the thing to be done of Mixed Audio Algorithm.
Specifically, voice playing device also includes power amplifier sound equipment to carry out public address etc..
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of video conferencing system, characterized by comprising:
At least two video conference terminals carry out video flowing transmission between each video conference terminal, wherein each video conference is whole
End includes；
One for acquiring the image collecting device of participant's stereo-picture；
One for acquiring the video acquisition device of participant's video information；
One for acquiring the voice acquisition device of participant's voice messaging；
One for showing the display device of participant's stereo-picture；
One for playing the video play device of participant's video information；
One for playing the voice playing device of participant's voice messaging.
2. video conferencing system as described in claim 1, which is characterized in that described image acquisition device includes:
Whole camera module, for acquiring the plane and depth information of the two parties in video conversation；
The entirety camera module includes depth camera, vertical cavity surface emitting laser and infrared camera.
3. video conferencing system as described in claim 1, which is characterized in that the video acquisition device includes:
Camera, for acquiring each frame video image of participant；
Video encoding module, for encoding each frame video image；
Video sending module, the video image after being used for transmission coding；Wherein
The video encoding module is also used to the clarity that dynamic adjusts video；
The video sending module is also used to abandon video frame automatically.
4. video conferencing system as described in claim 1, which is characterized in that the voice acquisition device includes:
Microphone, for acquiring audio data；
Voice coding module is used for coded audio data, in favor of transmission；
Voice sending module, for transmitting the audio data after coding；Wherein
The voice coding module is also used to carry out audio data at noise suppressed processing, jitter buffer processing and mute detection
Reason.
5. video conferencing system as described in claim 1, which is characterized in that the display device includes:
Image synthesis and output module, for synthesizing the 3D solid mould of a personage according to the collected picture of different angle
Then type determines the 3D that current sight and face orientation are seen by detection user sight at this time and face's azimuth information
Three-dimensional model picture is to export；
Without medium floating projection module, includes an optical element, break up the light of incident image, light passes through in optical element
After crossing at least 2 secondary reflections, reassemble to form mid-air real image corresponding with incident image in the sky.
6. video conferencing system as claimed in claim 5, which is characterized in that described image synthesis includes with output module:
Feature Points Matching unit, for finding the image section shared in acquired image；0
Image matching unit estimates the transformation of geometric aspects between image for the characteristic point of matching connection；
Panorama sketch resistance straightening unit is rotated for correcting relative to 3D；
Image equalization compensating unit, for the global illumination for balancing all images and tone；
Image frequency range integrated unit is merged for image frequency range, is connected edge, halation effect and parallax effect between image to eliminate
Fruit.
7. video conferencing system as claimed in claim 5, which is characterized in that the optical element be SMA optical element or
DCRA optical element.
8. video conferencing system as described in claim 1, which is characterized in that the video play device includes:
Video reception module, for receiving the video image after encoding；
Video decoding module, for being decoded to the video image after coding；
Desktop display, for showing decoded video image.
9. video conferencing system as described in claim 1, which is characterized in that the voice playing device includes:
Speech reception module, for receiving the audio data after encoding；
Tone decoding module, for being decoded to the audio data after coding；
Sound card, for the audio data after broadcast decoder.
10. video conferencing system as claimed in claim 9, which is characterized in that the voice playing device also includes:
Echo cancellation module does counteracting operation according to the audio frame that has just played in the audio frame of acquisition, by echo from acquisition
It is disposed in frame；
Multi-path voice is mixed into all the way by mix module.
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| WO2020210937A1 (en) * | 2019-04-15 | 2020-10-22 | Shanghai New York University | Systems and methods for interpolative three-dimensional imaging within the viewing zone of a display |
| CN112153442A (en) * | 2019-06-28 | 2020-12-29 | Oppo广东移动通信有限公司 | Playing method, device, terminal, television equipment, storage medium and electronic equipment |
| CN112887294A (en) * | 2021-01-21 | 2021-06-01 | 北京云上曲率科技有限公司 | Multi-person voice chat system based on remote process call |
| CN113132671A (en) * | 2019-12-31 | 2021-07-16 | 明基智能科技（上海）有限公司 | Video conference system |
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