The doctor's visit to the hospital is a type of extraterritorial enforcement. The development of network information technology has helped the management of outside medical care. The application of mobile video surveillance technology in the Yishou system can effectively prevent the occurrence of medical escape and build a technological defense line. Based on the needs of medical management applications, Tiandi Weiye proposed the easy-to-save mobile video surveillance system architecture. This article analyzed in detail the key technologies, application advantages of mobile video surveillance, and the application effects of external video surveillance.
Outside the hospital, as the name implies, it is a special form of execution of punishment outside the detention center. It is a combination of law and human nature. However, the complexity of the implementation environment has directly led to an increasingly heavy security alert task, and the risk of escape has remained high. The escape of detainees will bring serious threats to the lives and property of the local people, and even negatively affect the image of the entire institution.
Therefore, it is a long-term and arduous task to prevent the escape of the hospitalization treatment and effectively prevent and control the occurrence of a safety accident. How to take effective safety management measures to protect people's safe living environment and reduce the occurrence of accidents is of great significance
Due to outside medical treatment, the tasks involved are numerous, the scope is wide, the location changes quickly, and the on-site environment is complex. It is difficult to monitor the medical site through the establishment of a fixed cable video surveillance system. Tiandi Waiye Mobile Video Surveillance Technology will effectively solve these problems and assist * administrators in monitoring at any time, thereby reducing and reducing the number of accidents that occur outside the hospital.
1 mobile video surveillance system structure
Tiandi Weiye Yishou mobile video surveillance system consists of intelligent marking terminal, high-performance anti-escape host, remote command terminal and other parts. As shown in Figure 1. Smart marker terminals, including video capture and wireless terminals. After the front-end video and audio camera captures the video, it is encoded in real time by the encoder into a format that meets the requirements, and then sent by the wireless network. The transmission network consists of public and private networks. The public network is mainly provided by the three major mobile, China Unicom, and telecom operators. With the promotion and application of 3G and 4G technologies, the public network can provide sufficient bandwidth and data transmission rate [1]. When the outside medical treatment location is far from the monitoring command center, it is appropriate to use the public network for video and audio data transmission to avoid the higher costs incurred by the private network construction. The special network is suitable for monitoring the position of the command center and the outside medical treatment site. The advantage is that the transmission rate is fast, the bandwidth is high, and the construction cost is reasonable.
The remote command terminal is developed based on the security management application requirements. It mainly implements functions such as call viewing, switching control, image storage, and fault monitoring for remote video. At present, the platform gradually increases the capabilities of video intelligent analysis and recognition, and realizes the automatic identification, alarm, and positioning of hazards, effectively improving its monitoring results.
Figure 1 Easy to keep mobile video surveillance system structure
2. Key technologies of mobile video surveillance systems
The transmission of video has strict requirements, requiring superior video encoding and decoding technology, Qos for mobile video transmission, and intelligent analysis.
(1) Advanced video codec technology requires high compression ratio, fast codec speed, high real-time transmission performance, and strong anti-interference ability of the transmission channel. At present, there are two major series of video codec technologies: MPEG and H.26X. H264 uses motion prediction and differential coding to reduce and remove redundant video data by intra-macroblock prediction and inter-prediction prediction, and differentially encoded residual values ​​between frames to achieve data compression. In the case of motion compensation, compression using the H264 encoder is more than twice that of MPEG-2 and 1.5 to 2 times that of MPEG-4. H264 is roughly divided into two layers, namely Video Coding Layer and Network Adaptive Layer (NAL) [2]. The VCL layer performs efficient compression and encoding of video data, and the NAL layer is used to shield the differences of various communication networks, and provides appropriate header information according to various transmission layer storage media, thereby improving the anti-interference ability of the video data. .
(2) Mobile Video Transmission Qos
In order to reduce the impact of network changes on video transmission, QoS control is required. QoS control technology is divided into congestion control and error control. Congestion control is to prevent network congestion as much as possible by controlling network traffic or transmission rate. When congestion occurs, it is restored as soon as possible to avoid delays. The congestion control strategy can be implemented through dynamic rate adjustment, and the state of the mobile network channel is detected and fed back during the video transmission process, and the video code rate and the transmission rate are adjusted at the coding end according to the feedback information in order to adapt to the mobile network. The bandwidth thus guarantees the smoothness of mobile video transmission. Error control refers to how error detection and recovery occurs when errors occur in network transmission. To avoid the poor real-time performance caused by repeated packet loss and retransmission, the error control strategy based on the importance of video frames is based on the characteristics of H.264 coded video sequences. Perform encapsulation and selective packet loss retransmission to minimize the impact of error codes on video quality [3].
(3) The video intelligent analysis and processing technology mainly uses special algorithms to intelligently retrieve and recognize the captured video content, and recognizes and alerts abnormal events.
3. Advantages of Tiandi Waiye Mobile Video Surveillance System
The application of Yishun Mobile Video Surveillance System in the implementation of supervision outside the prison is as follows:
(1) Compared with the traditional fixed-line video surveillance systems, the environmental conditions of out-of-office visits performed in the off-site implementation are fast and the situation is complex. The monitoring sites are involved. If a traditional fixed-line video surveillance system is used, the transmission network Optical cable lines need to be laid, and the monitoring sites will have a variety of situations depending on the condition of the monitored personnel. The fixed video acquisition front-end and transmission network are all installed on the line, which has a large construction cost and poor flexibility.
(2) Applying a mobile video surveillance system, management personnel only need to view and view the site conditions in the monitoring and management center, which is accurate and efficient. No manual real-time on-site viewing. High efficiency and strong real-time performance. In addition, after the application of the mobile video surveillance system, historical events can be traced through historical video recordings to identify the actual situation at the time of the incident and provide an effective basis and reference for the analysis and processing of the incident.
4, easy to keep mobile video surveillance system security management application effect
The role of mobile surveillance video in application areas is mainly reflected in the following aspects:
(1) Safety supervision and management of on-site staff. Mobile video surveillance system, safety management personnel in the monitoring and management command center can be real-time monitoring of the work situation of on-site staff, such as whether to make favorable or unfavorable behavior to the prisoners, but also to provide on-site staff safety protection.
(2) Enforcement outside the prison reflects the majesty of the law, while outside the hospital it reflects the tolerance of the law. Yishou Mobile Video Surveillance System is an improvement and sublimation of traditional fixed surveillance.
(3) Innovative use of mobile video surveillance. Through research on video codec technology, rate control model, and video transmission mechanism, a high-resolution, high-fluency mobile video surveillance system was implemented.
5 Conclusion
Tiandi Weiye Mobile Video Surveillance is more flexible than traditional video surveillance and does not require long-distance optical cable laying. The construction period is short. Yishou Mobile Video Surveillance System can play the role of real-time monitoring and early warning on the spot in external medical management. It can effectively trace back after an adverse event and has obvious advantages. It is worth learning and applying in other areas of management work to reduce safety. Incident rate.
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