Application notes introduce the application difference between the advanced Internet Protocol (IP) camera and analog camera in the security video surveillance system. Unlike traditional products, IP cameras can support HD (HD) images, local data storage, image analysis, and remote control. This application note also describes the application of H.264 video compression technology in the IP camera network, briefly introduces the MAXIM's MOBICAM3 IP camera reference design.
introduction
The IP camera in the CCTV system (CCTV) is transmitted audio, video data, and control signals via Ethernet links in accordance with the Internet Protocol (IP). It has many advantages compared to traditional simulated security monitoring cameras. Analog cameras typically transmit analog NTSC / PAL signals through coaxial cables. Unlike analog cameras: IP cameras support HD (HD) screen, intelligent analysis, local video storage, and remote control. Video compression techniques are usually used in an IP camera that has image analysis, video encryption (prevent hacker attack) and can package video data into Ethernet data. The compressed video data stream is sent to a hybrid digital video recorder (DVR) or a network video recorder (NVR) for storage, playback, and display. IP Network Video Monitoring System allows security monitoring personnel to perform remote monitoring, send pan / tilt / scaling (PTZ) commands via IP network, controlling the control center to control cross-regional or multi-location security monitoring cameras. Low-power camera design can be powered by Ethernet (POE) without additional power supply. The same cable is transmitted data and power, and the PoE installation can greatly reduce the wiring cost. In some cases, it is also possible to replace the Ethernet by a wireless network (such as Wi-Fi®), which is convenient for the camera layout. This is especially important for those families that have not yet available Ethernet, and "Cloud Computing" DVR is used instead of physical DVR.
Multimedia stream H.264 and sports JPEG compression technology
In the same image quality, the compression ratio of the H.264 video compression standard is approximately twice the early MPEG-4 standard. In the H.264 standard, "high-end" is defined as the highest video quality at the lowest rate, especially suitable for video security monitoring. The response time (delay) is shorter encoding scheme helps shorten the waiting time of the security monitor personnel. In addition, HD video coding enables the details of the IP camera to collect images, for example, facial features, automotive licenses, etc., improve the image quality of safety monitoring. Due to the limited network bandwidth, the system can be encoded / recording all the HD data streams through a local area network (LAN), while also transmitting images with lower unity sharpness to the distal display through the WAN (WAN). MOBICAM3 720P H.264 / M-JPEG IP Camera Reference Design In addition to H.264, many security monitoring systems also require backward compatible devices that do not support H.264. Sports JPEG (M-JPEG) standards provide backward compatibility capabilities for such systems and the ability to collect high-definition and lossless images. In particular, it can collect JPEG still images while supporting H.264 encoding for uninterruptible video recording, and still image acquisition can be triggered by special events.
Image analysis
Image analysis is to analyze video data and make decisions accordingly. Using software analysis functions can take appropriate operations according to special events without having to enter instructions for security monitoring personnel. For example, if the camera detects that someone passes through the safety zone, a alarm signal can be issued. Image analysis functions include motion detection, homology and image tracking. All of these features require configuration in an intuitive graphical user interface (GUI) in PC-based security monitoring software. IP camera block diagram.
Embedded Linux® software and network
The IP camera needs to have the ability to deliver video data 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 Stream Protocol (RTSP). In addition, the reference design also supports the following Ethernet protocols: HTTP, DHCP, SMTP, TCP / IP, UDP, TFTP, FTP, NTP, and UPNPTM. The data stream can be encrypted using AES or SHA encryption technology. , Reading the full text, the technology area
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