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  • Internet Protocol cameras and H.264 compression technology in the safety monitoring system

          Abstract: This application note describes the application of differences in security video surveillance system senior Internet Protocol (IP) cameras and analog cameras. Different from the traditional products, IP cameras can support high-definition (HD) images, local data storage, image analysis and remote control functions. This application note describes in detail the H.264 video compression technology the IP camera network application, a brief introduction Maxim of the Mobicam3 IP camera reference design.

          Introduction

          Closed-circuit television (CCTV) system in the IP camera in accordance with the Internet Protocol (IP) through the Ethernet link transmit audio, video data and control signals. Compared with the traditional analog security cameras, they have many advantages. The analog cameras are generally analog NTSC / PAL signal via coaxial cable. Analog cameras: IP camera supports high definition (HD) screen, intelligent analysis, the local video store and remote control.

          With image analysis, video encryption (to prevent hacker attacks), and video data can be packaged into Ethernet data the IP camera, commonly used video compression technology. Compressed video data stream sent to a hybrid digital video recorder (DVR) or Network Video Recorder (NVR) for storage, playback and display. IP network video surveillance system allows security personnel to remotely monitor, sent over an IP network pan / tilt / zoom (PTZ) command and control center can control the inter-regional or multi-site security surveillance cameras.

          Low-power camera design can be powered over Ethernet (PoE), no additional power supply. Using the same cable to transfer data and power, PoE installations can significantly reduce cabling costs. In some cases, by the wireless network (such as Wi-Fi?) Instead of Ethernet to facilitate the layout of the camera. This point is particularly important for those who have yet to provide Ethernet home security cameras, this time using "cloud computing" DVR instead of physical DVR.

          Multimedia streaming H.264 and Motion JPEG compression technology

          In the case of the same image quality, the H.264 video compression standard compression ratio is about two times of the early MPEG-4 standard. H.264 standard, the definition of "high" to get the highest video quality at the lowest bit rate, especially suitable for video security and surveillance applications. Shorter response time (delay) of the encoding scheme to help shorten the waiting time for security personnel. In addition, high-definition video encoding enables the IP camera to capture the details of the image, for example, facial features, and vehicle license, improve safety monitoring of image quality. Due to limited network bandwidth, require the system to one HD stream encoding / video through a local area network (LAN), but also through the wide area network (WAN) clarity all the way to lower the image transfer to a remote display.

          In addition to H.264, the safety monitoring system also requires backward compatible with existing, does not support H.264 devices. HD Motion JPEG (M-JPEG) standard for such systems to provide backward compatibility, as well as acquisition, the ability to non-destructive image. In particular, it supports H.264 encoding for uninterrupted video recording can also capture JPEG still images, still images collected by the special event trigger control.

          Image analysis

          Image analysis is to analyze the video data and make decision-making process accordingly. Software analysis functions can take appropriate actions based on specific events, no security personnel enter the command. For example, if the camera detects someone through the security zone, to give an alarm. The image analysis features include motion detection, tripwires, and image tracking. All of these features in the PC-based security monitoring and management software using an intuitive graphical user interface (GUI) configuration.

          Embedded Linux ® software and network

          IP cameras need to have the video data stream to multiple clients. For example, Maxim´s IP camera reference design (Mobicam3) supports up to 16 clients, and supports Real-time Transport Protocol (RTP) and real-time data streaming protocol (RTSP). In addition, the reference design also supports the following Ethernet protocols: HTTP, DHCP, SMTP, the TCP / IP, UDP, TFTP, FTP, NTP and the UPnP? Using AES or SHA encryption technology to encrypt the data stream.

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