In professional video surveillance analog cameras have been increasingly replaced by the network due to the growth of technological and functional advantages of the latter, as well as the convergence of their prices. Modern IP-cameras provide image resolution from VGA up to several megapixels, efficiently compress video using video codecs H.264, MPEG-4, M-JPEG, and others. Allow remotely controlled and managed IP-CCTV system via a standard web browser or specialized software. They are connected to an Ethernet network and transmit video over LAN / WAN, and also support a variety of network, video analytics and surveillance functions.
IP-cameras videonablyudeniyaSetevye camera is a device with a private IP-addresses that are connected directly to an Ethernet network and can be installed in any place where it is possible to connect them. The main electronic components IP-cameras are the sensor element (matrix), one or more processors and memory. The lens can be supplied with or chosen separately. Coming from the CCD camera video signal is first digitized and then compressed by a processor in a variety of formats (most often in H.264, MPEG-4 or M-JPEG) for transmission to other network devices. Power processor determines performance and transmission rate of the video stream over a network. A number of characteristics, such as the type of matrix, sensitivity, image settings (white balance, AGC, gamma correction, etc..), IP-cameras are comparable to analog, but the presence of a network interface and additional processors allows them to perform video analysis, image scaling, overlay it titles and digital video transmission over long distances and others.
From local to wide-area IP-video systems
Using network cameras on objects of different scale and purpose, you can create IP-based video surveillance, which will involve the minimum number of IP-based devices. For example, to build IP-video system of a small shop, you need to set up to 10 IP-based cameras and management software that can be installed on the PC. The "live" video will be displayed on the monitor security officer, and the video recording is on the PC hard drive. To record large amounts of video data can be used NVR NVR, and if the system is working, analogue and IP-cameras - it is advisable to apply the hybrid DVRs. Modern network equipment allows you to build IP-based video surveillance of any configuration with virtually unlimited scalability.
Remote and secure access to the video
Video-based network equipment more cost effective and provide flexibility of control, due to the fact that access to network cameras and video in real-time and / or recording is possible from any device at any time. However, IP-cameras are protected against unauthorized access and provide all the necessary functions of safety management across the network, including IP-address filtering, digest authentication and password protection at the user level. Since IP-cameras of famous brands built on open platforms, they are easily integrated into the software for video systems from different vendors, as well as access control systems, POS and others.
Ability to select video codec
For the preservation and transmission of video over long distances professional IP-surveillance cameras using advanced video compression algorithms, providing a significant reduction in "weight" of the video with no visible loss of image quality.
Motion JPEG (M-JPEG) - recording format stream of individual frames, each of which is compressed to JPEG independently. When using the M-JPEG video codec average compression ratio of the video is about 1: 5, and the rate of transmission of video from IP-camera with a resolution of 720x576 pixels - up to 5 Mbit / s. In M-JPEG, each frame is a complete JPEG-image, and all of them have the same guaranteed quality, determined by the level of compression selected for IP-cameras or video servers. The only limitation of the codec M-JPEG - high resource.
MPEG-4 - a group of coding standards of audio, video camera or video server. MPEG4 uses the so-called fractal image compression, which implies the selection of the image contours and textures of objects. Most of the functions in the MPEG-4 are open, so developers can decide which ones to use.
H.264 - progressive compression standard analog video (another name - MPEG-4 Part 10), which has a higher resolution than Motion JPEG or MPEG-4 at the same data rate and bandwidth or the same image quality when a lower data rate.
One of the main advantages of IP-cameras is the ability to receive analog video at a higher resolution. Modern IP-camera is able to generate an image with a resolution greater than HDTV, an aspect ratio of 16: 9 and complies fully with the SMPTE (Society of Motion Picture and Television Engineers) for HDTV. Moreover, for the protection of sites for traffic management and control processes are increasingly began to use IP-based megapixel camera, the resolution of which reaches 10-15 MPx, allowing you to perform precise identification of objects.
Multicasting video and create a "virtual camera"
Most modern IP-video devices can transmit on the network at the same time from 2 to 8 or more video streams with adjustable resolution and frame rate for each. In this case, flows from IP-cameras in M-JPEG format used to record in the archive, and video to H.264 or MPEG-4 - for remote users, and broadcast video in real time. Along with this, many camera supports electronic PTZ - zoom, rotate and tilt the image, and some models can be created on the basis of one camera several "virtual camera" with their units, both for recording and playing back video in real time.
A wide selection of software for managing IP-CCTV
To set up the 2-3 cameras and work with the current and / or recorded video, you can use a standard web browser, but to configure and manage local and geographically-distributed video system it is advisable to buy the professional software. Today's full-featured software for IP-video systems from many manufacturers have, as a rule, "client-server", supports most video codecs, and provides management of all IP-based devices in the system and flow control from both IP-, and analog cameras connected the network through IP-video servers. Perform video monitoring, archiving, and management of all devices in the system can also means software that is supplied each IP-cameras.
To date, all present in the market software can be divided into two groups:
Software that supports IP-cameras and IP-video servers only one brand, for example, the Russified software AXIS Camera Station, capable of controlling the operation of up to 50 IP-based cameras and video servers AXIS brand on a single server; or russified AV100 of Arecont Vision and other .;
Software that supports the device and allows many manufacturers to build multi-brand IP-video systems, for example, Milestone XProtect, Cisco VSM, ITV «Intellect», Pelco DS NVs, Smartec NetStation et al.
Security features of modern network cameras
Video surveillance systems, which include those involving IP-cameras, automatically monitor events and respond to emergency situations, depending on the type of alarm and threats. Each network camera equipped with video motion detection (models with audio channel - also sound detector) have alarm inputs for external alarm sensors and relay outputs for connecting actuators. Many models use a notification system for hacking attempts, corruption body, closing / painting Lens IP-cameras, and support a variety of algorithms alert the operator. This can significantly reduce the burden on staff, reduce the requirements for network bandwidth and storage capacity, and create a more robust and effective video surveillance system.
Video analytics built-in IP-cameras
In the design of video surveillance and security for various objects are being used increasingly Network Camera with built-in video analytics. Models with Intelligent video allow you to highlight certain areas of video surveillance in the field of IP-cameras, within which it is possible to detect and identify people and objects, tracking multiple objects (up to 100), and others. Moreover, IP-camera with video analytics processor is capable to count the number people passing through certain doors, identify the idlers, track crossing a certain area of a man, left objects, the movement of people / vehicles in a prohibited direction and others.
The ability to transmit video and power over a single cable
Network cameras work with standard IP-networks, computers and servers, with many current models, as well as other network equipment, technology support Power over Ethernet (PoE). When you use this technology to power IP-cameras is served by free veins the same twisted pair Cat. 5, in which the broadcast and video. No need for laying power cable not only expands the possibilities for accommodation cameras, but also significantly reduce the cost of acquisition, installation, operation, equipment, and total cost of ownership video system as a whole.