KR100453491B1 - System for video communication through network and method thereof - Google Patents

Abstract

The present invention relates to a video communication system and a method through a network that enables real-time video education. To this end, in accordance with an embodiment of the present invention, a real-time chat is possible by designating a specific talker while providing information to a plurality of talkers. A master device that transmits command packets and video communication data including address data and transmission control data, receives the command packet and video communication data from the master device, and delivers the command packet to the talkers corresponding to the addresses in the command packet. And a server configured to give priority to the addresses designated by the master device to control the information transmission speed, and a slave device receiving command packets and video communication data transmitted through the server, and exchanging information with the master device. Accordingly, the present invention enables high or low speed data transmission for each talker according to the requirements of the master device without being limited by changes in the transmission speed environment of the network, and also minimizes the bandwidth loss that can be transmitted by the network, thereby realizing the movement of real-time video operation. It is processed naturally to provide the effect that data can be transmitted and received without delay delay enough to carry out the actual conversation.

Description

System for video communication through network and method thereof

The present invention relates to a video communication system and a method through a network, and more particularly, to a video communication system and a method through a network that enables real-time video education.

In the conventional method of image education through a network, an education site that organizes image education prepares a video file in which lecture contents are previously photographed through a camera and a microphone.

After that, students who wish to attend the course access the training site through the network, and the training site transmits the video file prepared in advance to the students.

In this video training method, the instructor cannot know how the students are reacting to the contents of the lecture, so the contents of the next lecture are unilaterally prepared.

In addition, if a student has a question about the content of the current lecture, he or she should send the question by e-mail or telephone after the lecture, and wait for the teacher's response.

As described above, the conventional video education method has a problem in that both the instructor and the students have to participate in the lecture passively, so that there are many limitations on the quality of the lecture content and the opportunity for active discussion.

In addition, the conventional video training method requires a lot of time because the server managing the data transmitted / received through the network checks the data of the students participating in the lecture by connecting the training site and the students through the network. There is a problem that a load may occur.

In order to provide real-time video education while overcoming these problems, the conventional video education method requires the construction of a server capable of high-speed data processing and a broadband line of a dedicated line that can guarantee a large amount of data transmission. There is a problem that it is difficult to build.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to enable real-time conversation over a network, and a video communication system and method through a network for controlling the amount and rate of transmission of video communication data for each talker. To provide.

1 shows a configuration of a video communication system via a network of an embodiment according to the present invention.

2 is a flowchart illustrating a data flow of a master device in a video communication method through a network according to an embodiment of the present invention.

3 is a flowchart illustrating a data flow of a server in a video communication method through a network according to an embodiment of the present invention.

4 is a flowchart illustrating a data flow of a slave device in a video communication method through a network according to an embodiment of the present invention.

Features of the video communication system via the network according to the present invention for realizing the above object, address data and transmission control to enable real-time chat by designating a specific talker while providing information to a plurality of talkers via the network A master device for transmitting an order packet including data and its own image communication data; The master device receives the command packet and the video communication data and transmits the command packet to the talkers corresponding to the addresses in the command packet, and gives priority to the addresses designated by the master device in the command packet to transmit the information of the video communication data. A server controlling the speed; And a slave device receiving the command packet and the video communication data transmitted through the server, and transmitting its own video communication data to other devices including the master device.

The command packet of the master device, the address data includes the address of the master device, the address of the talkers, the address specified by the master device, the transmission control data is a frame generation rate adjustment command and code format for each address ) Includes configuration change commands.

The server gives priority to the information transmission rate step by step to the addresses of the talkers according to the level of the frame generation rate adjustment command for each address in the command packet.

The master device,

A master terminal for providing real-time image communication data thereof including images and voices, and instructing control commands for the transmission amount and transmission rate of image information with the slave device; A driver for storing real-time video communication data of the master terminal in the form of a raw video file; According to the command of the master terminal, address data including the address of the master terminal and IP addresses of designated talkers, and transmission control data including a frame generation rate adjustment command and a code format setting change command for each address are converted into command packets. A controller for generating and outputting the output; A file selection unit which receives the frame generation rate adjustment command of the controller and selects a raw video file at a predetermined interval from the driver by the frame generation rate indicated by the frame generation rate adjustment command; The frame selector outputs the coding frame data obtained by searching for the coding form assigned to the raw video file selected by the file selection unit in real time, and outputs the video communication data received from the slave device from the coding form or the video communication data for each speaker. A codec that finds and decodes a coding form, generates a raw video file, and delivers the same to a driver; And a data transmission unit for transmitting and receiving the coding frame data transmitted from the codec and the command packet of the control unit in accordance with a transmission protocol on a network.

The command packet of the controller transmits the video and audio of the talker designated by the master device in real time and high resolution through high-level data processing, and the voice and video of the remaining talkers are transmitted in non-real time and low resolution through low-level data processing. Be sure to

The file selector creates an interval counter to retrieve a raw video file from the driver, and transmits the raw file at the frame rate indicated per second to the codec.

The codec uses a code format suitable for the level of maximum image information that can be transmitted within a bandwidth limit of a network used for providing real time information according to an instruction of a code format setting change command of the controller.

The codec supports the video data of the dialog and the other dialogs designated by the master device to have different types of code formats and resolutions, and to edit screens for outputting screens of multiple dialogs using a plurality of code formats and resolutions on a single screen. Have a combination function.

The data transmitter transmits and receives a command packet through a transmission control protocol (TCP), and transmits the coded frame data through a user datagram protocol (UDP).

The slave device,

A slave terminal for exchanging image communication data between the master device and the talker and instructing the talker's control command; A driver for storing real-time video communication data including images and voices transmitted and received between the slave terminal and the master device as a raw video file; Receiving a command packet transmitted through the server, transmitting video communication data from the slave terminal to the master device, and receiving video communication data from the master device transmitted through the server and other slave terminals on the network. A data transmission unit; A control unit which receives the command packet and the image communication data from the data transmission unit, instructs operation control according to a frame generation rate adjustment change and code format setting change command in the command packet, and processes a control command from the slave terminal; A file selection unit for changing a frame generation rate of the raw video file from the driver in accordance with an operation control instruction regarding a frame generation rate adjustment change command of the controller; And real-time decoding the video communication data transmitted from the master device or another slave device by searching for the coding type in the coding form granted to the self or the received video communication data according to an operation control instruction regarding a code format setting change command of the controller. To generate a raw video file and pass it to the driver.

On the other hand, another feature of the video communication system via the network according to the present invention, including the address data and transmission control data to provide real-time discussion to give a specific student voice while providing educational information to a large number of students through the network An instructor controller for transmitting a command packet and lecture data; A server configured to receive a command packet and lecture data from the instructor control unit, deliver the command packet and the lecture data to students corresponding to the address in the command packet, and adjust the information transmission speed by giving priority to the addresses of the students who are given the right to speak; And a lecture control unit receiving the command packet and the lecture data transmitted through the server, participating in the real-time distance education, and exchanging information with the instructor control unit and other students.

The video communication method through the network according to the present invention is characterized in that it comprises the steps of: a) transmitting command packets and video communication data relating to a conversation channel for real-time information exchange between a plurality of talkers and designated talkers via a network at the master side; b) the server receiving the command packet of step a) transmitting the command packet and video communication data to the talkers by adjusting the information transmission rate by the command packet; And c) receiving the command packet of the step b) and the image communication data from the talker side, and subsequently transmitting and receiving necessary information with the master and other talker sides.

In step a), the master side designates a specific talker while providing information to a plurality of talkers, and includes the address of the talker who gave the talk in the command packet.

In step a), the command packet includes transmission control data for controlling the transmission environment of the video communication data, and address data relating to the addresses of the talkers and the master itself.

The transmission control data of the command packet includes a sub-frame generation rate adjusting command and a code format setting changing command.

The transmission control data of the command packet is transmitted in real time and high resolution through the high-level data processing of the talker designated by the master, and the voice and video of the remaining talkers are processed in non-real time and low resolution through low-level data processing. To be transmitted.

In the step a), the image communication data includes a raw video file containing the image and the voice by the master using a camera and a microphone.

In the step a), the video communication data is output to the talker side as coding frame data obtained by searching for a code format of a coding form assigned to the master by the command packet in real time, and the video communication data received at the talker side is The coded form of each speaker or the coded form is found in the video communication data, and is decoded in real time to generate a raw video file.

In the step a), the image communication data uses a code format suitable for the level of maximum image information that can be transmitted within the network bandwidth limit used for providing real-time information by the command packet.

In the step a), the transmitting of the image communication data and the command packet is performed according to a transmission protocol on the network.

Step c) changes the picture frame rate and the code format by the command packet to exchange video communication data with other talkers including the master side in accordance with the transmission environment of the talker side.

In step c), the code format is changed by the command packet, and raw video is obtained by real-time decoding the video communication data received in step b) by searching for a coding form assigned to each address of the talker or a coding form in the video communication data. Create a file.

The video communication data transmitted / received through the steps a) to b) is the contents of lectures transmitted and received between the instructor and the students on a specific education subject.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a configuration of a video communication system via a network of an embodiment according to the present invention.

As shown in FIG. 1, a system of an embodiment according to the present invention largely includes a master device 100, a server 200, slave devices 300, 400, and 500, and a master device 100 and a slave device. 300 exchanges information through real-time video communication.

At this time, the video communication between the master device 100 and the slave device 300 can transmit and receive information on a variety of topics, but in the embodiment according to the present invention video communication between the instructor and the students on the subject of education in particular Learn about the data.

Then, the master device 100 is operated by a manager or an instructor managing the progress, the slave device 300 is preferably operated by the students.

In addition, the network between the master device 100 and the slave device 300 includes both leased private lines and shared lines. In addition, the limits of the data transmission rate and the amount of data transmission per unit time between the master device 100 and the slave device 300 become a bandwidth through which transmission data can be transmitted without delay in a predetermined unit time in a network.

The real-time distance education between the master device 100 and the slave device 300 maintains the quality level delivered to the counterpart without delaying the video and audio between the instructor and the students to be sufficient to perform the actual lecture.

The master device 100 includes a master terminal 101, a camera 102 and a microphone 103, a driver 110, a controller 120, a file selector 130, a codec 140, and a data transmitter ( 150), but is not limited to such.

The master terminal 101 instructs a control command for the amount and rate of image information transmission with the slave device 300. At this time, the instructor designates a specific student during the course of the lecture to give a voice and cause participation in the lecture.

The driver 110 stores the raw video file produced a predetermined number of times per second through the camera 102 and the microphone 103, and outputs the raw video file transmitted from the codec 140 to the master terminal 101.

Then, the control unit 120 adjusts the frame data rate for each address and address data including the master terminal 101 own address and the IP address of the learner designated by the instructor according to the instruction instructed by the master terminal 101. Generate and output a command packet including transmission control data including a command and a code format setting change command.

Hereinafter, the function of the control unit 120 will be described in detail.

The controller 120 inputs a static IP address of the master device 100 and a minimum and maximum usable speed limit of a frame to be used in the entire course group network through the initial device setup screen.

In addition, the controller 120 may input the type of codec format to be used and the resolution value of the minimum and maximum available video screens of the codec in the case of MPEG-4, and the names and static IP addresses of students enrolled in the same group. You can also enter it.

As described above, the controller 120 may change the contents input through the initial setup screen even during operation, and each setup value may be stored in a separate storage medium.

The controller 120 recognizes a command for designating a specific student by the operator of the master terminal 101, and displays the static IP address, the maximum occurrence rate and codec of the available frame, and the maximum resolution of the corresponding student in the database. Locate and generate a command packet containing all of this information.

The command packet generated as described above is transmitted to the file selector 130 and the codec 140, and is transmitted to the server 200 through the data transmitter 150.

On the other hand, the control unit 120 selects a file so that the video information of the participants of the other groups except the video or audio information of a specific student or instructor is processed by a codec having a minimum frame generation rate and a minimum resolution value specified as a default at the time of setup. Instructions are given to the unit 130 and the codec 140.

That is, all master devices 100 and slave devices 300, 400, and 500 connected to the group network always process only the video and audio of the instructor before receiving a command packet designating a specific talker or learner.

Then, after receiving the command packet, voice information of the other group participants except for the specified talker is not processed, and the image information is also processed by the codec of the minimum frame rate and the lowest resolution.

The controller 120 may download the software of the controller and the codec of the controller of the slave device 300 so that the setup value and the viewing of the class can be made according to the request of the slave device 300 when the initial or new learner joins the group.

Meanwhile, the controller 120 may perform authentication of students participating in the group.

The file selection unit 130 receives the command packet from the control unit 120 and selects, at a predetermined interval, the driver 110 as many times as many times of the raw video file indicated by the frame generation rate adjustment command in the command packet.

In this case, the file selector 130 creates an interval counter to import the raw video file from the driver 110 at a predetermined interval within one second of the frame generation rate indicated by the frame generation rate adjustment command.

That is, normally, the file selector 130 reads the raw video file per second from the driver 110 as many times as the number of frame transmissions (usually, the minimum value) corresponding to the default value indicated by the controller 120, and delivers it to the codec 140. do.

However, when the command packet is input by the controller 120, the file selector 130 reads the raw video file per second according to the frame rate command indicated by the command packet from the driver 110 and delivers it to the codec 140.

The codec 140 stores IP addresses of all students participating in the group from the control unit 120, and finds a coding form given to the original video file selected by the file selection unit 130 to find the coding frame data obtained in real time. Output

The codec 140 may adjust the size of the image data transmitted through the network according to the connected network environment, and enable real-time image transmission between the instructor and the students at all times.

In addition, the codec 140 searches for and decodes the coding form of the image data received from the students in the received image data or in the coding form assigned to each address to generate a raw video file. Therefore, the codec 140 adjusts the codec type for each student so as not to be limited by the change in the transmission speed environment of the network at the moment or for a long time.

That is, the codec 140 outputs the coded frame data obtained by searching the code format of the master device 100 itself in the coding form given by the address of the dialogue device, and real-time coding the raw video file selected by the file selector 130, and the slave. The video communication data received from the device 300 is searched for a coding form for generating the received data or in real-time decoding by searching for a coding form assigned to each address of the talker to generate a raw video file, and delivers it to the driver 100.

The codec 140 may use various types of coding formatters such as M-JPEG, H.623, MPEG-2, MPEG-4, and Sorenson.

On the other hand, the codec 140 is coded with a small frame size (byte per frame) according to the level of the maximum image information that can be transmitted within the bandwidth limit of the network used for real-time information transmission by the code format setting change command of the control unit 120 The format may be used or a coding format having a large frame size may be used.

As such, the codec 140 plays a role of creating an image screen to be output to its own monitor and a coding frame file to be transmitted.

First, the role of the codec 140 to create an image screen to be output to its monitor is as follows.

The codec 140 creates an image that can be output to itself as a screen having a high resolution and a codec defaulted from the controller 120.

In addition, the coding file received from the slave device 300 through the network checks whether the corresponding IP address is the specified student's IP address. Then, if the IP address of the designated student is decoded, the coding file is decoded according to the coding type and resolution of the command packet already received, and if the IP address is not the IP address of the designated student, the coding file defaults to the designated coding type and the lower level resolution. Decode

The codec 140 generates a final image file for synthesizing the self output image and the received decoded image, and outputs the image to the own monitor, and outputs it through the driver 100.

The codec 140 creates a coding frame file to be transmitted by using the original video file transmitted from the file selection unit 130 according to the default coding type and resolution value instructed by the control unit 120 when the command packet is not received. Process.

In the above, when the command packet is received, the codec 140 processes and transmits the raw video file transmitted from the file selection unit 130 to the data transmission unit 150 according to the indicated coding type and resolution.

The data transmitter 150 processes transmission and reception of the command packet generated by the controller 120 and the coded frame data generated by the codec 140 according to a transmission protocol on the network.

In this case, the data transmission unit 150 transmits and receives the command packet through TCP / IP to increase the reliability of the command transmission, and transmits the coded frame data through the UDP to allow continuous data transmission even in the case of some loss of the coded frame data.

Above, UDP is a connectionless transport layer protocol in the TCP / IP protocol stack, a simple protocol for exchanging datagrams without a positive acknowledgment or delivery guarantee.

TCP / IP uses one of H.232, H.245, and SIP (session initiation protocol), which are currently widely used, to indicate the frame per second required for this. Option file).

Meanwhile, among the video communication data transmitted and received between the master device 100 and the slave device 300, the media stream uses RTP / RTCP, which is an industrial standard protocol.

In addition, the video resolution in video communication data transmitted and received between the master device 100 and the slave device 300 supports QCIF, CIF, 4CIF, and custom formats.

When the server 200 receives the command packet and the coding frame data from the master device 100 as a scan server or a video server, the server 200 transmits the command packet and the coding frame data to students at the corresponding address.

In addition, the server 200 recognizes the addresses of the students designated by the instructor in the command packet of the master device 100, so that the coding frame data of the students 'addresses specified above is higher than the coding frame data of the students' addresses not specified among the students. Broadcast by giving priority.

At this time, the server 200 may create a priority table according to the frame generation rate indicated by a default for each user or a command packet, and may give priority to each step according to the level of the frame generation rate.

Therefore, the coding frame data of the designated students can be transmitted at a high speed so that the exchange of video communication data between the instructor and the designated students can be processed prior to other students.

As a result, the server 200 increases the image transmission speed and size between the designated students and the instructor, thereby enabling high-definition broadcasting, and video data of unspecified students can be broadcasted at a low speed or a small size. Therefore, the server 200 minimizes the bandwidth loss that can be delivered from the network so that the movement of the video motion between the instructor and the designated student is naturally processed.

On the other hand, the slave device 300 is similar to the master device 100, the slave terminal 301, the camera 302 and the microphone 303, the driver 350, the control unit 320, the file selector 330, codec 340, but is not limited thereto.

Each component included in the above-described slave device 300 operates almost the same as the component described in the master device 100.

However, the controller 320 translates the command packet received through the network and delivers it to each component. That is, the controller 320 separately transfers the frame generation rate adjustment command and the code format setting change command in the command packet received through the server 200 to the file selector 330 and the codec 340.

Then, the raw video file stored in the driver 350 changes the frame generation rate and the coding through the file selector 330 and the codec 340.

At this time, the codec 340 changes the code format of the raw video file generated by the slave device 300 according to an operation control instruction regarding the code format setting change command of the control unit 320, or the coding form assigned to each address of the talker. Decodes the received coding frame data in real time to generate a raw video file, and delivers it to the driver 350.

Then, the driver 350 outputs the raw video file to the slave terminal 301 so that the students can watch the lecture contents of the instructor and the video screens of other students through the slave terminal 301.

Therefore, the slave device 300 exchanges image communication data with the master device 100 as well as other slave devices 400 and 500 through the server 200.

The operation of the video communication system via the network of the embodiment according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a data flow of a master device in a video communication method through a network according to an embodiment of the present invention.

As shown in FIG. 2, the instructor conducts a lecture through the camera 102 and the microphone 103, and assigns a specific student by using a touch screen or other input device at random during the lecture.

Then, the master terminal 101 via the control unit 120 command packet including the master terminal 101 own address and the IP address designating a specific student, frame generation rate adjustment command and code format setting change command for each address (S12)

At this time, the command packet is the voice and video data of the student and lecturer designated by the master terminal 101 to increase the number of times of transmission of the frame per second (for example, at least 10 times per second), the code format and resolution that can use high resolution To use.

In addition, the command packet is video and audio data of the other learners except the designated student, the audio data is negligible according to the default value or the command packet, and the number of transmissions per second (for example, once per second) Significantly reduce the number of pixels and use a code format and resolution that can use low resolution.

The command packet is generated at the master terminal 101 at the time of designating a specific student and delivered to the slave devices 300, 400, and 500 at the corresponding address to adjust the code format setting and frame generation rate of the slave device.

In this way, after the code format setting of the slave device and the frame generation rate are adjusted, the state continues until another student is assigned or the existing student is released.

Therefore, when designating another learner, the master terminal 101 generates and outputs a command packet instructing release of assignment to the previously designated learner's slave device.

The file selector 130 receives the command packet and selects the raw video file from the driver 110 a predetermined number of times per second indicated by the frame generation rate adjustment command given thereto (S13).

In addition, the codec 140 receives the command packet from the control unit 120 and finds the coding format of the master device 100 in the coding form assigned to each student according to the code format setting change command and codes the real time coding frame data. In operation S14, the coding frame data received from the slave device 300 is found and decoded into a real-time raw video file after the coding form is given from the address of the talker or the received coding form, and transmitted to the driver 110. (S15, S16)

When the coded frame data is generated in the codec 140, the data transmitter 150 transmits the command packet to TCP / IP and the coded frame data to the server 200 in accordance with a transmission protocol of the network (S17). )

In the above, the file selection unit 130 and the codec 140 may change from time to time the students specified by the operator of the master terminal 101, so that each time the designated students are converted, the frame transmission rate and code format of each student It is desirable to have a variable function to change.

The master device 100 receives the image communication data transmitted from the slave device 300 through the data transmission unit 150, and the master terminal 101 displays the received image communication data through the driver 110. .

In this case, the screens of the students are divided and displayed on the screen of the master terminal 101. In particular, the screen of the students designated by the instructor is larger than the screens of the other students, and the image movement is maintained at an advanced level.

3 is a flowchart illustrating a data flow of a server in a video communication method through a network according to an embodiment of the present invention.

As shown in FIG. 3, the server 200 receives the command packet and the coding frame data transmitted through the data transmitter 150 (S21), and the IP address of the learner designated by the instructor among the address data of the command packet. To distinguish between IP addresses of unspecified students (S22).

In response to the frame generation rate adjustment command of the command packet, the server 200 assigns priority to the addresses of the students step by step according to the level of the frame generation rate specified for each address (S23).

At this time, the priority allows the coding frame data corresponding to the IP address of the learner designated by the instructor to be transmitted at a higher speed than the coding frame data corresponding to the IP address of the learners.

When the priority table is created, the server 200 may adjust the transmission rate of the coding frame data from the low speed to the high speed by adjusting the number of transmission of the coding frame data per second of the students (S24).

The server 200 transmits the command packet to the students at the address corresponding to the address data, and groups the video communication data transmitted from the slave devices 300 and the master device 100 according to the transmission level of each priority table. Broadcast to (S25)

The server 200 performs various functions in addition to the above-mentioned functions in order to control the data flow between the master device 100 and the slave device 300, but those skilled in the art may easily Do not list because you will understand.

4 is a flowchart illustrating a data flow of a slave device in a video communication method through a network according to an embodiment of the present invention.

As shown in FIG. 4, the data transmission unit 310 of the slave device 300 receives a command packet and coded frame data transmitted through the server 200. (S31) At this time, the data transmission unit 310 is a student Image communication data may be transmitted to the master device 100 via the server 200.

The controller 320 separately transmits a frame generation rate adjustment command of the command packet to the file selection unit 330 and a code format setting change command to the codec 340. Unlike the control unit 120 of the master device 100, the control unit 320 does not generate a command packet, but performs a passive role of translating the command packet transmitted through the server 200 and delivering the command packet to each component. .

Then, the file selector 330 changes the raw video file stored in the driver 350 to the frame generation rate specified by the frame generation rate adjustment command, and the codec 340 changes the raw video file according to the code format setting change command. Change the sign format of (S32).

That is, the codec 340 generates and outputs coding frame data by real-time coding of the student's image data (usually, a raw video file), or the coding received from the master device 100 and the slave devices 400 and 500 of other students. The frame data is decoded in real time by finding the coding type assigned to each address of the talker to generate a raw video file, and then delivers the raw data file to the driver 350.

Accordingly, the students can watch the lecture contents without delay delivery by the high quality and high speed coding frame data transmitted from the master device 100 through the slave terminal 301, and the low quality received from the other slave devices 400 and 500. In addition, the participation in the lecture can be confirmed by the low rate coding frame data (S33).

On the other hand, the learners granted the right to speak by the instructor will respond to the questions and requests of the instructor at the level of real time conversation with the instructor (S34).

At this time, the slave terminal 301 creates the response data of the learner including the image and the voice through the camera 302 and the microphone 303.

Here, the student's response data is stored in the driver 350 as a raw video file, and the control unit 320 and the file selection unit according to the frame generation rate adjustment command and the code format setting change command of the command packet received when the instructor grants a voice. 330 and codec 340 generate high-speed, high-quality image communication data.

The video communication data generated in this way is transmitted to the server 200 by the data transmission unit 310, and the server 200 transmits the above video communication data to the master device 100 according to the transmission level of the priority table. Live conversations between students and students are possible. (S35)

At this time, the image communication data of the slave device 300 granted the right to speak is broadcast not only to the master device 100 but also to the other slave devices 400 and 500 through the server 200, so that other students may also be given the right to speak with the instructor. View live conversations with students.

Meanwhile, the image communication data transmitted and received between the master device 100 and the slave device 300 includes both coding frame data of the master device 100 and the slave device 300.

Traditional video training always handles different frame rates between the client and server to deliver video transfers between instructors and students at a dynamic frame rate. However, in the embodiment according to the present invention, the frame rate of the student's image is changed under the control of the instructor.

In the above, a preferred embodiment of a video communication system and method through a network according to the present invention has been described, but the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Can be carried out, and this also belongs to the scope of the present invention.

In the video communication system and method through the network according to the present invention, it is possible to control the transmission amount and the transmission speed of video communication data transmitted and received between the master device and the slave device for each user to perform real time video communication, thereby limiting the change in the transmission speed environment of the network. It is possible to transmit high speed or low speed data per talker according to the request of the master device without receiving.

The video communication system and the method through the network according to the present invention minimize the transferable bandwidth loss of the network so that the movement of the real-time video operation is naturally processed so that data can be transmitted and received without delaying enough delay to perform a real conversation. There is.

In addition, the video communication system and method through the network according to the present invention can give priority to the conversation channel between the master device and the slave device so that real-time data exchange with the designated talker can be processed first, and furthermore, By adjusting the transmission speed and size, high quality broadcasting is possible.

In addition, the video communication system and method through the network according to the present invention improves the reliability of data transmission by continuously transmitting the video communication data transmitted and received between the master device and the slave device according to the transmission protocol, and the data continues to be lost even if some data is lost. There is an effect that transmission is possible.

Claims (23)

A master device that transmits its own video communication data and an order packet including address data and transmission control data to designate a specific talker for real-time chat while providing information to a plurality of talkers through a network. ; The master device receives the command packet and the video communication data and transmits the command packet to the talkers corresponding to the addresses in the command packet, and gives priority to the addresses designated by the master device in the command packet to transmit the information of the video communication data. A server controlling the speed; And A slave device that receives a command packet and video communication data transmitted through the server and transmits its own video communication data to another device including the master device. Video communication system via a network comprising a. The method of claim 1, The command packet of the master device, The address data includes the address of the master device, the address of the talkers, and the address designated by the master device, and the transmission control data includes a frame generation rate adjustment command and a code format setting change command for each address. Video communication system. The method according to claim 1 or 2, And the server gives priority to the information transmission speed step by step according to the level of the frame generation rate adjustment command for each address in the command packet. The method of claim 1, The master device, A master terminal for providing real-time image communication data thereof including images and voices, and instructing control commands for the transmission amount and transmission rate of image information with the slave device; A driver for storing real-time video communication data of the master terminal in the form of a raw video file; According to the command of the master terminal, address data including the address of the master terminal and IP addresses of designated talkers, and transmission control data including a frame generation rate adjustment command and a code format setting change command for each address are converted into command packets. A controller for generating and outputting the output; A file selection unit which receives the frame generation rate adjustment command of the controller and selects a raw video file at a predetermined interval from the driver by the frame generation rate indicated by the frame generation rate adjustment command; The frame selector outputs the coding frame data obtained by searching for the coding form assigned to the raw video file selected by the file selection unit in real time, and outputs the video communication data received from the slave device from the coding form or the video communication data for each speaker. A codec that finds and decodes a coding form, generates a raw video file, and delivers the same to a driver; And Data transmission unit for transmitting and receiving the coding frame data transmitted from the codec and the command packet of the control unit in accordance with the transmission protocol on the network Video communication system via a network comprising a. The method of claim 4, wherein The command packet of the controller transmits the video and audio of the talker designated by the master device in real time and high resolution through high-level data processing, and the voice and video of the remaining talkers are transmitted in non-real time and low resolution through low-level data processing. Video communication system via network. The method of claim 4, wherein And a file selector configured to create an interval counter to obtain a raw video file from the driver, and transmit the raw file to the codec at a frame generation rate indicated per second. The method of claim 4, wherein And the codec uses a code format suitable for a level of maximum image information that can be transmitted within a bandwidth limit of a network used for providing real-time information according to an instruction of a code format setting change command of the controller. The method of claim 4, wherein The codec supports the video data of the dialog and the other dialogs designated by the master device to have different types of code formats and resolutions, and to edit screens for outputting screens of multiple dialogs using a plurality of code formats and resolutions on a single screen. / Video communication system via a network with a combination function. The method of claim 4, wherein And the data transmission unit transmits and receives a command packet through a transmission control protocol (TCP), and transmits the coded frame data through a user datagram protocol (UDP). The method of claim 1, The slave device, A slave terminal for exchanging image communication data between the master device and the talker and instructing the talker's control command; A driver for storing real-time video communication data including images and voices transmitted and received between the slave terminal and the master device as a raw video file; Receiving a command packet transmitted through the server, transmitting video communication data from the slave terminal to the master device, and receiving video communication data from the master device transmitted through the server and other slave terminals on the network. A data transmission unit; A control unit which receives the command packet and the image communication data from the data transmission unit, instructs operation control according to a frame generation rate adjustment change and code format setting change command in the command packet, and processes a control command from the slave terminal; A file selection unit for changing a frame generation rate of the raw video file from the driver in accordance with an operation control instruction regarding a frame generation rate adjustment change command of the controller; And According to an operation control instruction for a code format setting change command of the controller, the coding form is found in the coding form or the received image communication data, and the video communication data transmitted from the master device or another slave device is decoded in real time. Codec that creates a raw video file and passes it to the driver Video communication system via a network comprising a. An instructor control unit providing instruction information to a plurality of students through a network and giving a voice to specific students to transmit command packets and lecture data including address data and transmission control data for real-time discussion; A server configured to receive a command packet and lecture data from the instructor control unit, deliver the command packet and the lecture data to students corresponding to the address in the command packet, and adjust the information transmission speed by giving priority to the addresses of the students who are given the right to speak; And A course control unit receiving the command packet and the lecture data transmitted through the server, participating in real-time distance education, and exchanging information with the instructor control unit and other students; Video communication system via a network comprising a. a) transmitting, on the master side, a command packet and video communication data relating to a chat channel for real-time information exchange between a plurality of talkers and designated talkers via a network; b) the server receiving the command packet of step a) transmitting the command packet and video communication data to the talkers by adjusting the information transmission rate by the command packet; And c) receiving the command packet of the step b) and the video communication data from the talker side and continuously transmitting and receiving necessary information with the master and other talker sides. Image communication method via a network comprising a. The method of claim 12, Step a) And assigning a specific talker to give a talk while providing information to a plurality of talkers on the master side, and including the address of the talker who gave the talk in a command packet. The method of claim 12, In step a) the command packet, And transmission control data for controlling a transmission environment of the video communication data, and address data relating to conversations and addresses of masters themselves. The method of claim 14, And the transmission control data of the command packet includes each sub-frame generation rate adjusting command and a code format setting changing command. The method of claim 14, The transmission control data of the command packet is transmitted in real time and high resolution through the high-level data processing of the talker designated by the master, and the voice and video of the remaining talkers are processed in non-real time and low resolution through low-level data processing. Method of video communication over a network to be transmitted. The method of claim 12, The video communication data in the step a), wherein the master comprises a raw video file containing the image and sound using a camera and a microphone. The method of claim 12, In the step a), the video communication data is output to the talker side as coding frame data obtained by searching for a code format of a coding form assigned to the master by the command packet in real time, and the video communication data received at the talker side is A video communication method through a network in which real-time decoding is performed by finding a coding form assigned to each speaker or a coding form in the video communication data, and generating the original video file. The method of claim 18, And in the step a), the image communication data uses a code format suitable for the level of maximum image information that can be transmitted within the network bandwidth limit used for providing real-time information by the command packet. The method of claim 12, The transmitting of the image communication data and the command packet in the step a), the image communication method via a network to transmit and receive in accordance with the transmission protocol on the network. The method of claim 12, In the step c), by changing the picture frame rate and the code format by the command packet, exchanging video communication data with other talkers including the master side in accordance with the transmission environment of the talker side. The method of claim 12, In step c), the code format is changed by the command packet, and raw video is obtained by real-time decoding the video communication data received in step b) by searching for a coding form assigned to each address of the talker or a coding form in the video communication data. Video communication method over a network that creates a file. The method of claim 12, The video communication data transmitted and received through the steps a) to b) is a lecture content transmitted and received between the instructor and the students on the subject of a specific education.