A low-latency video call remote interaction method and device

Abstract

The present invention relates to a low-latency video call remote interaction method and apparatus, including: establishing an RTP session at the sending end and the receiving end of the video call remote interaction, and starting RTCP at the sending end and the receiving end to periodically send RTCP packets; the sending end sends data packets of real-time data of the video call through RTP, and the receiving end monitors the delay data of the received data packets; the sending end receives the RR packets sent from the receiving end, and the sending end parses the RR packets to obtain the delay data of the received data packets; the sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the delay data; when the interaction ends, both the sending end and the receiving end send BYE packets to leave the RTP session. The present invention monitors the delay data of the received data packets to determine whether to increase the transmission rate of the real-time data of the video call data, and maximizes the transmission rate of the real-time data as much as possible, so that the video call remote interaction has low latency and stable data transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of remote interaction, and particularly to a method and device for remote interaction in video calls with low latency. Background Art

[0002] Remote interaction in video calls is a technology that utilizes the Internet and digital communication technologies to achieve real-time audio and video communication between remote users. The development and popularization of this technology have changed the way people communicate and brought many conveniences. Especially in remote medical treatment, doctors can conduct remote consultations through video calls to provide timely medical advice and guidance to patients. This method is extremely convenient for patients, especially in remote areas or during the epidemic.

[0003] Currently, remote interaction in video calls applied in the medical system often ignores the real-time nature of its data, resulting in high latency, which in turn affects the subsequent diagnosis and treatment progress, and even delays the best opportunity. Therefore, it is necessary to propose a method for remote interaction in video calls with low latency to overcome the above problems. Summary of the Invention

[0004] The purpose of the present invention is to at least solve one of the deficiencies of the prior art, and provide a method and device for remote interaction in video calls with low latency.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] Specifically, a method for remote interaction in video calls with low latency is proposed, including the following:

[0007] Establish an RTP session at the sending end and the receiving end of the remote interaction in video calls, and the sending end and the receiving end start RTCP to periodically send RTCP packets;

[0008] The sending end sends real-time data packets of video call data through RTP, and the receiving end monitors the latency data of the received packets;

[0009] The sending end receives the RR packet sent from the receiving end, and the RR packet includes the latency data of the received packets. The sending end parses the RR packet to obtain the latency data of the received packets;

[0010] The sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the latency data to ensure low latency and stable data transmission during the remote interaction in video calls;

[0011] When the interaction ends, both the sending end and the receiving end send BYE packets to leave the RTP session.

[0012] Further, specifically, the sending end determines whether to increase the transmission rate of real-time data of video call data according to the delay data, including,

[0013] Preset a first threshold. When the delay data is higher than the first threshold, maintain the current transmission rate and clear the current running cache;

[0014] When the delay data is lower than or equal to the first threshold, increase the current transmission rate by one step according to a preset step size.

[0015] Further, the method further includes that the receiving end also monitors the packet loss rate data of received packets and adds it to the RR message sent to the sending end. When the sending end parses the RR message, it can also obtain the packet loss rate data of received packets;

[0016] Preset a second threshold. When the packet loss rate data is higher than the second threshold, an alarm for abnormal packet loss is given;

[0017] And preset a scoring system. Preset a delay data weight and a packet loss rate weight in the scoring system. Convert the obtained delay data into a delay score, and convert the obtained packet loss rate data into a packet loss rate score;

[0018] Combine the delay score, delay data weight, packet loss rate score, and packet loss rate weight to obtain a final score;

[0019] Judge whether the final score is in the low network state segment, medium network state segment, or high network state segment in the scoring system. If the final segment is in the low network state segment, do not perform the operation of increasing the current transmission rate. If it is in the medium network state segment, still increase the current transmission rate by one step according to the preset step size. If it is in the high network state segment, increase the current transmission rate by two steps according to the preset step size.

[0020] Further, the method further includes,

[0021] Both the sending end and the receiving end adopt QoS rules to adjust the network traffic priority of the RTP session, further improving the traffic transmission rate of video call remote interaction.

[0022] Further, specifically, both the sending end and the receiving end adopt QoS rules to adjust the network traffic priority of the RTP session, including,

[0023] At the sending end or the receiving end,

[0024] Preset a QoS policy. Determine the priority of different types of traffic through DSCP marking, and set the network traffic priority of the RTP session to the highest level;

[0025] The router or switch marks data packets according to the traffic type, and puts the marked data packets into the corresponding queues or processing flows according to the preset QoS policy;

[0026] Process the data packets in the set priority order through the preselected scheduling algorithm.

[0027] Further, specifically, the preselected scheduling algorithm is the priority scheduling algorithm.

[0028] Further, the method further includes that when accessing at the sending end and the receiving end, an SDES message is also sent to describe its own relevant information, and the sending end periodically sends an SR message to report the statistical information of the sent data.

[0029] The present invention also proposes a low-latency video call remote interaction device, including the following:

[0030] An RTP session establishment module, used to establish an RTP session at the sending end and the receiving end of the video call remote interaction, and the sending end and the receiving end start RTCP and periodically send RTCP messages;

[0031] A data packet transceiver module, used to send real-time data packets of video call data through RTP at the sending end, and monitor the delay data of the received data packets at the receiving end;

[0032] A message transceiver module, used to receive the RR message sent from the receiving end at the sending end, the RR message includes the delay data of the received data packets, and the sending end parses the RR message to obtain the delay data of the received data packets;

[0033] A judgment module, used to judge at the sending end whether to increase the transmission rate of the real-time data of the video call data according to the delay data, so as to ensure low latency and stable data transmission during the video call remote interaction;

[0034] When the interaction ends, both the sending end and the receiving end send BYE messages to leave the RTP session.

[0035] The present invention also proposes a medical workstation, including,

[0036] A workstation host, in which a high-definition image acquisition module and video call software are provided, the video call software applies the method according to any one of claims 1-7, and the high-definition image acquisition module is used to acquire surgical images;

[0037] A network device, including a 5G traffic card, a 5G router and a network cable, used to provide network services for the workstation host.

[0038] Further, the medical workstation further includes,

[0039] A display, a high-definition camera, a microphone, a color laser printer, a foot switch, a speaker, and an input device, wherein the display, the high-definition camera, and the speaker are used to cooperate with each other to conduct video communication based on the video call software, and the foot switch is used to control the start and stop of the high-definition image acquisition module; the color laser printer is used to perform printing operations, and the input device is used to input data streams.

[0040] The beneficial effects of the present invention are as follows:

[0041] The present invention provides a low-latency video call remote interaction method and device, which conducts video call remote interaction based on the RTP protocol and performs real-time transmission control through the RTCP protocol. The latency data of received data packets is monitored to determine whether to increase the transmission rate of real-time video call data, so as to maximize the transmission rate of real-time data as much as possible, and thus make the video call remote interaction have low latency and stable data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] By describing the embodiments shown in the accompanying drawings in detail, the above and other features of the present disclosure will become more apparent. The same reference numerals in the drawings of the present disclosure represent the same or similar elements. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0043] Figure 1 Shows a flowchart of a low-latency video call remote interaction method of the present invention;

[0044] Figure 2 Shows a schematic structural diagram of a medical workstation applying the low-latency video call remote interaction method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in combination with the embodiments and the drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0046] Example 1, referring to Figure 1 , the present invention provides a low-latency video call remote interaction method, including the following:

[0047] Step 110: Establish an RTP session at the sending end and the receiving end of the video call remote interaction, and the sending end and the receiving end start RTCP to periodically send RTCP packets;

[0048] Step 120: The sending end sends data packets of real-time video call data through RTP, and the receiving end monitors the delay data of the received data packets;

[0049] Step 130: The sending end receives the RR packet sent from the receiving end. The RR packet includes the delay data of the received data packets. The sending end parses the RR packet to obtain the delay data of the received data packets;

[0050] Step 140: The sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the delay data, so as to ensure low latency and stable data transmission during the video call remote interaction;

[0051] Step 150: When the interaction ends, both the sending end and the receiving end send BYE packets to leave the RTP session.

[0052] In this preferred embodiment, video call remote interaction is based on the RTP protocol, and real-time transmission control is performed through the RTCP protocol. The delay data of the received data packets is monitored to determine whether to increase the transmission rate of the real-time data of the video call data, so as to maximize the transmission rate of the real-time data as much as possible, and then make the video call remote interaction have low latency and stable data transmission.

[0053] As a preferred embodiment of the present invention, specifically, the sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the delay data, including,

[0054] A first threshold is preset. When the delay data is higher than the first threshold, the current transmission rate is maintained and the current running buffer is cleared;

[0055] When the delay data is lower than or equal to the first threshold, the current transmission rate is increased by one step size according to the preset step size.

[0056] As a preferred embodiment of the present invention, the method further includes that the receiving end also monitors the packet loss rate data of the received data packets and adds it to the RR packet sent to the sending end. The sending end also obtains the packet loss rate data of the received data packets when parsing the RR packet;

[0057] A second threshold is preset. When the packet loss rate data is higher than the second threshold, a packet loss exception alarm is performed;

[0058] And a preset scoring system, in which the weight of delay data and the weight of packet loss rate are preset. Convert the obtained delay data into delay scores, and convert the obtained packet loss rate data into packet loss rate scores;

[0059] Combine the delay score, the weight of delay data, the packet loss rate score, and the weight of packet loss rate to obtain the final score;

[0060] Judge whether the final score is in the low network state segment, the medium network state segment or the high network state segment in the scoring system. If the final segment is in the low network state segment, do not perform the current transmission rate increase operation. If it is in the medium network state segment, still increase the current transmission rate by one step size according to the preset step size. If it is in the high network state segment, increase the current transmission rate by two step sizes according to the preset step size.

[0061] Among them, by setting a warning threshold, that is, the second threshold, if the packet loss rate is too high, it is judged that an abnormality occurs and an alarm is issued. If it is normal, that is, the packet loss rate is not higher than the second threshold, then according to the scoring system, the packet loss rate and the delay data are converted into a total score, and the current network state is judged according to the total score situation. If the network state is good, the speed is increased in a large step. If the network state is medium, the speed is increased according to the original plan. If the network state is poor, the speed is not increased to ensure the stability of data transmission quality. In addition, the weight of delay data and the weight of packet loss rate can be determined in advance by mature methods such as the analytic hierarchy process.

[0062] In this preferred embodiment, RTCP (Real - Time Transport Control Protocol) is used in an RTP (Real - Time Transport Protocol) session to monitor the quality of data transmission and provide feedback, thereby enabling dynamic adjustment of the transmission rate to avoid network congestion. The following are the specific steps of the RTCP workflow: 1. Initial connection and session establishment RTP session initialization: The sender and receiver establish an RTP session and start data transmission. RTCP initialization: Each participant starts RTCP and periodically sends RTCP packets. 2. Types of RTCP packets There are various types of RTCP packets, mainly including: Receiver Report (RR): Sent by the receiver to report the situation of received data packets. Sender Report (SR): Sent by the sender to report the statistical information of sent data packets. Source Description (SDES): Describes participant information. BYE: Sent when a participant leaves the session. 3. Data transmission and monitoring Data transmission: The sender sends real - time data such as audio and video through RTP. Quality monitoring: The receiver monitors the packet loss rate and delay performance metrics of received data packets. 4. RTCP packet sending Periodic report: The receiver periodically sends RR packets to report the quality of received data to the sender, including the packet loss rate, round - trip time, etc. SR packet: The sender periodically sends SR packets to report the statistical information of sent data. 5. Dynamic adjustment of transmission rate Feedback reception: The sender receives and analyzes the RR packets sent by the receiver. Rate adjustment: Based on the feedback information, the sender dynamically adjusts the transmission rate. 6. Continuous monitoring and adjustment Continuous monitoring: Throughout the transmission process, the sender and receiver continuously exchange RTCP packets to dynamically monitor the network status. Continuous adjustment: Based on real - time feedback, the sender continuously adjusts the transmission rate to ensure the stability and quality of data transmission. 7. Session end Sending BYE packets: When the session ends, the participants send BYE packets to notify other participants to leave the session. Resource release: After the session ends, relevant resources are released. Through the above process, RTCP can effectively monitor and adjust the quality of RTP data transmission, avoid network congestion, and improve the quality and stability of real - time audio and video transmission.

[0063] As a preferred embodiment of the present invention, the method further includes

[0064] Both the sender and the receiver adopt QoS rules to adjust the network traffic priority of the RTP session, further improving the traffic transmission rate of video call remote interaction.

[0065] As a preferred embodiment of the present invention, specifically, both the sender and the receiver adopt QoS rules to adjust the network traffic priority of the RTP session, including

[0066] At the sender or the receiver

[0067] A preset QoS policy determines the priorities of different types of traffic through DSCP marking, and sets the network traffic priority of the RTP session to the highest level;

[0068] Marks packets according to the traffic type for the router or switch, and puts the marked packets into the corresponding queues or processing flows according to the preset QoS policy;

[0069] Processes packets according to the preset scheduling algorithm in the set priority order.

[0070] In this preferred embodiment, the specific process steps for the device to adjust the network traffic priority according to the QoS (Quality of Service) rules are as follows: 1. QoS policy defines traffic classification: Determine the priorities of different types of traffic, such as real-time audio and video streams, data downloads, web browsing, etc. Priority allocation: Allocate priorities to each traffic type, usually using markings (such as DSCP markings) or queues (such as priority queues, weighted queues) to distinguish. 2. Traffic marking and classification Mark packets: The router or switch marks the packets according to the traffic type so that the subsequent router or switch can perform priority processing based on these markings. Classification processing: According to the preset QoS policy, put the marked packets into the corresponding queues or processing flows. 3. Queue management Queue setting: Set different queues according to the priority and service level. Queue scheduling: Use scheduling algorithms (such as priority scheduling, weighted fair queue scheduling, etc.) to process packets in the set priority order. 4. Traffic control and adjustment Congestion management: Monitor the network status and traffic load, and detect congestion situations. Dynamic adjustment: According to the real-time network conditions and QoS policy, adjust the priorities or processing order of the packets in the queue to maximize the quality of service and avoid network congestion.

[0071] As a preferred embodiment of the present invention, specifically, the preselected scheduling algorithm is a priority scheduling algorithm.

[0072] As a preferred embodiment of the present invention, the method further includes that when accessing the sending end and the receiving end, an SDES message is also sent to describe its own relevant information, and the sending end periodically sends an SR message to report the statistical information of the sent data.

[0073] The present invention also proposes a low-latency video call remote interaction device, including the following:

[0074] An RTP session establishment module is used to establish an RTP session at the sending end and the receiving end of the video call remote interaction, and the sending end and the receiving end start RTCP and periodically send RTCP messages;

[0075] The data packet sending and receiving module is used to send data packets of real-time video call data through RTP at the sending end and monitor the delay data of received data packets at the receiving end;

[0076] The message sending and receiving module is used to receive the RR message sent from the receiving end at the sending end. The RR message includes the delay data of the received data packet. The sending end parses the RR message to obtain the delay data of the received data packet;

[0077] The judgment module is used to judge at the sending end whether to increase the transmission rate of real-time data of video call data according to the delay data, so as to ensure low latency and stable data transmission during remote video call interaction;

[0078] When the interaction ends, both the sending end and the receiving end send BYE messages to leave the RTP session.

[0079] Refer to Figure 2 , the present invention also proposes a medical workstation, including,

[0080] A workstation host, in which a high-definition image acquisition module and video call software are provided. The video call software applies the method described in any one of claims 1-7. The high-definition image acquisition module is used to acquire surgical images;

[0081] A network device, including a 5G data card, a 5G router and a network cable, is used to provide network services for the workstation host.

[0082] As a preferred embodiment of the present invention, the medical workstation further includes,

[0083] A display, a high-definition camera, a microphone, a color laser printer, a foot switch, a speaker, and an input device. The display, the high-definition camera and the speaker are used to cooperate with each other for video communication based on the video call software. The foot switch is used to control the start and stop of the high-definition image acquisition module; the color laser printer is used for printing operations, and the input device is used for inputting data streams.

[0084] Yilingtong is composed of a medical workstation hardware platform, a video live broadcast software system, and a network device.

[0085] The workstation hardware includes a workstation host (built-in high-definition image acquisition module), a display, a high-definition camera, a microphone, a network device, a color laser printer, a foot switch, a speaker, and an input device. The high-definition image acquisition module is used to acquire surgical images. The high-definition camera, the microphone, and the speaker are used for video communication. The foot switch is used to acquire pictures, and the printer is used to print inspection reports.

[0086] The video live broadcast software system includes client software running on a workstation host, client software running on a mobile terminal device, and management software running on a cloud server.

[0087] The network device consists of a 5G traffic card, a 5G router, and a network cable. Since the operating room environment lacks networking conditions, Yilingtong is equipped with network devices to wirelessly receive 5G network signals, which are then converted into a wired network by the router to provide stable and fast network conditions for the workstation.

[0088] The medical workstation applying the method proposed by the present invention has the following advantages.

[0089] 1) Smooth video call: It supports 5G network. Spring Boot and MyBatis-Plus are used in the background to implement the project facility construction. A chat platform is built using WebSocket and Netty. A dedicated point-to-point communication link is adopted, and the instant video transmission is smooth and will not be affected by other communication links.

[0090] 2) Automatic storage: The video call content can be automatically saved as a video file and supports replay. While the video file is saved on the terminal, a backup is also left in the cloud.

[0091] 3) Support for mobile teaching: The dual Token strategy is adopted to implement interface authentication and user authentication. Remote users can communicate with the operating room via video through mobile devices, regardless of time and place. They can watch the ongoing surgery anytime and anywhere. If they want to invite the other party to have a surgical exchange, they can directly call the other party without having to notify the other party in advance, and the other party does not need to wait.

[0092] In addition, in each embodiment of the present invention, each functional module can be integrated into a processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0093] When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or system, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc., that can carry the computer program code.

[0094] Although the description of the present invention has been quite detailed and several of the described embodiments have been described in particular, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but rather should be regarded as providing a broad interpretation of these claims in light of the prior art by reference to the appended claims, thereby effectively covering the intended scope of the present invention. In addition, the present invention has been described above in terms of embodiments foreseeable by the inventor for the purpose of providing a useful description, and non-substantive modifications to the present invention that are not currently foreseeable may still represent equivalent modifications of the present invention.

[0095] As described above, these are only the preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. As long as it achieves the technical effects of the present invention by the same means, it should fall within the protection scope of the present invention. Within the protection scope of the present invention, various different modifications and variations can be made to its technical solutions and / or embodiments.

Claims

1. A low-latency video call remote interaction method, characterized in that, The following are included: Establish an RTP session at the sending end and the receiving end for remote interaction in a video call, and start RTCP at the sending end and the receiving end to periodically send RTCP packets; The sending end sends data packets of real-time data for the video call through RTP, and the receiving end monitors the delay data of the received data packets; The sending end receives the RR packet sent from the receiving end, and the RR packet includes the delay data of the received data packets. The sending end parses the RR packet to obtain the delay data of the received data packets; The sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the delay data to ensure low latency and stable data transmission during remote interaction in the video call; When the interaction ends, both the sending end and the receiving end send BYE packets to leave the RTP session; Specifically, the sending end determines whether to increase the transmission rate of the real-time data of the video call data according to the delay data, including Presetting a first threshold. When the delay data is higher than the first threshold, maintain the current transmission rate and clear the current running cache; When the delay data is lower than or not higher than the first threshold, increase the current transmission rate by one step according to a preset step size; The method further includes that the receiving end also monitors the packet loss rate data of the received data packets and adds it to the RR packet sent to the sending end. When the sending end parses the RR packet, it will also obtain the packet loss rate data of the received data packets; Presetting a second threshold. When the packet loss rate data is higher than the second threshold, an alarm for abnormal packet loss is given; And preset a scoring system. Preset the delay data weight and the packet loss rate weight in the scoring system, convert the obtained delay data into a delay score, and convert the obtained packet loss rate data into a packet loss rate score; Combine the delay score, the delay data weight, the packet loss rate score, and the packet loss rate weight to obtain a final score; Judge whether the final score is in the low network state segment, the medium network state segment, or the high network state segment in the scoring system. If the final segment is in the low network state segment, do not perform the operation of increasing the current transmission rate. If it is in the medium network state segment, still increase the current transmission rate by one step according to the preset step size. If it is in the high network state segment, increase the current transmission rate by two steps according to the preset step size.

2. The low-latency video call remote interaction method according to claim 1, wherein The method further includes Adjust the network traffic priority of the RTP session for both the sending end and the receiving end using QoS rules to further improve the traffic transmission rate of remote interaction in the video call.

3. A low-latency video call remote interaction method according to claim 2, characterized in that, Specifically, for both the sending end and the receiving end, use QoS rules to adjust the network traffic priority of the RTP session including At the sending end or the receiving end Preset a QoS policy, determine the priority of different types of traffic through DSCP marking, and set the network traffic priority of the RTP session to the highest level; For the router or switch to mark the data packets according to the traffic type, and according to the preset QoS policy, put the marked data packets into the corresponding queue or processing flow; Process the data packets according to the set priority order through a preselected scheduling algorithm.

4. A low-latency video call remote interaction method according to claim 3, wherein Specifically, the preselected scheduling algorithm is the priority scheduling algorithm.

5. A low-latency video call remote interaction method according to claim 1, characterized in that The method further includes that when the sending end and the receiving end are accessed, an SDES message is also sent to describe their relevant information, and the sending end periodically sends an SR message to report the statistical information of the sent data.

6. A low-latency video call remote interaction device, characterized in that, Applying a low-latency video call remote interaction method according to any one of claims 1-5, including the following: An RTP session establishment module, configured to establish an RTP session at the sending end and the receiving end of the video call remote interaction, and the sending end and the receiving end start RTCP to periodically send RTCP messages; A data packet sending and receiving module, configured to send data packets of real-time data of the video call through RTP at the sending end, and monitor the delay data of the received data packets at the receiving end; A message sending and receiving module, configured to receive an RR message sent from the receiving end at the sending end, where the RR message includes the delay data of the received data packets, and the sending end parses the RR message to obtain the delay data of the received data packets; A judgment module, configured to judge at the sending end whether to increase the transmission rate of the real-time data of the video call data according to the delay data, so as to ensure low latency and stable data transmission during the video call remote interaction; When the interaction ends, both the sending end and the receiving end send BYE messages to leave the RTP session.

7. A medical workstation, characterized in that, Including, A workstation host, in which a high-definition image acquisition module and video call software are provided. The video call software applies the method according to any one of claims 1-5, and the high-definition image acquisition module is used to acquire surgical images; A network device, including a 5G data card, a 5G router, and a network cable, for providing network services to the workstation host.

8. A medical workstation according to claim 7, characterized in that, Further including, A display, a high-definition camera, a microphone, a color laser printer, a foot switch, a speaker, and an input device. The display, the high-definition camera, and the speaker are used to cooperate with each other to conduct video communication based on the video call software. The foot switch is used to control the start and stop of the high-definition image acquisition module; the color laser printer is used for printing operations, and the input device is used for inputting data streams.

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