Video camera with sensorVideo surveillance, as a phenomenon, is actively being introduced into our daily life. People no longer notice the presence of surveillance cameras, which are installed almost everywhere. They can be seen on the streets, in offices and near country cottages. Often these cameras are installed in the apartments of urban high rises. But this was not always the case.

Content

  • 1 A bit of history
  • 2 Digital video surveillance
  • 3 Internet in video surveillance systems
  • 4 Video cameras with motion sensor and recording function
    • 4.1 Wireless WiFi IP Camera Wanscam HW 0031 HD
    • 4.2 Outdoor video camera with motion sensor DVRS 66
    • 4.3 Hidden mini-camcorder with motion sensor AMBERTEK G100
  • 5 Prospects for the development of cameras for video surveillance

A bit of history

Camera with motion sensor Initially, video surveillance was conventional television control. For the first time, the US police suggested using television to control public order in 1965. This practice spread very quickly in major American cities, and then television surveillance began to be used in other countries.

New impetus to the development of video surveillance systems was given with the advent of reel, and then cassette recorders. Analog video surveillance systems ensured that information was recorded on videotape, which allowed them to be stored and used, for example, as evidence in court. In the 70s of the 20th century, the recorded image from surveillance cameras began to be widely used throughout the world.

However, the further development of video surveillance was hampered by significant shortcomings inherent in analog recording and information processing systems. After all, the constant video recording led to a significant consumption of expensive film, and repeated recordings on one and the same film contributed to its rapid deterioration. In addition, the implementation of video recording in conditions of poor visibility and especially at night was a serious problem.

These shortcomings were completely eliminated with the appearance at the end of the last century. digital video recording methods and processing the recorded video signal.

Digital video surveillance

CCTV Camera ParametersThe technical revolution in the field of video surveillance occurred thanks to the invention and introduction into mass production:

  • CCD arrays (CCD - charge coupled device);
  • digital multiplexer.

New CCTV cameras, created on the basis of the CCD matrix, allowed for video recording in low light conditions and at night.

The emergence of digital multiplexers has allowed significantly expand functionality video surveillance systems. In this case, it became possible:

  1. The implementation of video simultaneously from multiple cameras.
  2. Turn on video cameras at a specified time interval or when motion is detected on a protected object.

Especially fast surveillance systems began to improve during the large-scale distribution of computer technology. As a result of the use of the latest technological solutions:

  • completely abandoned the use of videotape, recording information first on hard drives, and then on miniature memory cards;
  • the image recorded in digital format, has become more clear and contrast;
  • Digital technologies for post-processing of the recorded video signal have significantly improved image quality.

Internet in video surveillance systems

Functional CCTV CameraThe use of Internet technologies has led to revolutionary changes in the field of video surveillance. With the help of streaming video, you can now see the signal from a surveillance camera anywhere in the world where there is Internet access. Using the World Wide Web, the owner of a surveillance camera (system) can remotely turn on the device, program it to turn on when motion is detected in a protected area, etc. That is why remote surveillance systems have been called the "all-seeing eye."

The main element of such systems has become a modern wireless video camera with motion sensor and recording.

Video cameras with motion sensor and recording function

In general, a miniature wireless video camera with a motion sensor and image recording provides:

  • recording a video signal to a micro SD memory card with a memory capacity of 4 to 128 GB;
  • automatic recording start after the built-in motion sensor triggers;
  • cyclic recording of the video signal (the camera erases the oldest parts of the recording in automatic mode, and records new ones in their place). Before switching on the cyclic recording mode to a 32 GB memory card, video clips with a total duration of up to 32 hours are placed;
  • video surveillance in conditions of complete darkness or insufficient light. To do this, the camera is equipped with built-in infrared (IR) LEDs of sufficient power;
  • remote parameter settings;
  • Record videos in AVI format, which allows you to view them on the PC screen.

Such cameras can be installed both indoors and outdoors. True, for outdoor use it is necessary dust and water proof housing With a special rubber seal card slot. The small size of modern wireless surveillance cameras allow them to covertly install, which will not allow a potential attacker to disable them.

Security video cameras are represented in the domestic market in a fairly wide range. Among them are the models described below.

Wireless WiFi IP Camera Wanscam HW 0031 HD

Dome camera is designed for installation in rooms. It is equipped with a built-in motion sensor and video recording device on a Micro SD memory card with a capacity of up to 128 GB. Provides the inclusion of recording on the movement or on a schedule.

Technical parameters of the camera:

  1. Video resolution, pixel - independent video streams: 1280 * 720, 640 * 352, 320 * 176.
  2. Overall dimensions, mm - 127 * 100.
  3. Weight, g - 335.
  4. IR illumination - 30 * 5 LEDs at a distance of 20 m.
  5. Motion detection - 4 independent zones with individual sensitivity settings.
  6. Power supply - DC 5V 2A.

Outdoor video camera with motion sensor DVRS 66

Budget video camera, made in a typical anti-vandal dust and moisture proof housing. It has a built-in motion sensor and a device for recording video on a Micro SD memory card with a volume of 4... 32 GB. Recording is activated only when the motion sensor is triggered.

Technical parameters of the camera:

  1. Video resolution, pixel - 640 * 480.
  2. Motion detection, m - 8.
  3. IR illumination, m - 20.
  4. Overall dimensions, mm - 210 * 8 * 8.5.
  5. Weight, g - 600.
  6. Supply voltage, V - 220.

Hidden mini-camcorder with motion sensor AMBERTEK G100

The smallest high-definition video camera has a built-in motion sensor (shadow control) and a video signal recorder on a Micro SD memory card with a capacity of up to 64 GB. The camera works offline and is able to record even while charging the battery. Recording starts when motion is detected.

Technical parameters of the camera:

  1. Video resolution, pixel - 640 * 480.
  2. Motion detection, m - 5.
  3. Overall dimensions, mm - 55 * 21 * 15.
  4. Weight, g - 50.
  5. Battery capacity, mAh - 250.
  6. Continuous recording time, hour - 1.5.

Prospects for the development of cameras for video surveillance

Specialists working in the field of video surveillance, predict that the further development of the industry is associated with implementation of video surveillance systems that meet the standards of high definition television (HDTV). This fully applies to video cameras that will be used in such systems.

However, it is now believed that the HD resolution of camcorders is reasonable maximum for the near future, allowing to solve the tasks performed by security systems. Apparently, in the near future, the efforts of the developers of cameras for video surveillance will be aimed at improving their performance and expanding the dynamic range. In addition, expanding the functionality of camcorders will be useful.