April 09, 2023

Detailed explanation of webcam

Camera focal length (mm)

  • The smaller focal length, closer viewing distance, larger field of view, and greater visible range. The longer focal length, farther viewing distance, smaller field of view, and smaller visible range. Common focal lengths and corresponding exposure distances are shown in figure below:
  • Detailed explanation of webcam

    Camera focal length

    Corresponding camera lens scene
  • 2.8mm lens is suitable for narrow space and wide angle view.
  • The 4mm lens is suitable for indoor use.
  • The 6mm lens is suitable for corridors and aisles.
  • The 8mm lens is suitable for shooting outdoors and at long distances.
  • The 12mm lens is used to observe certain key points and environment from a relatively long distance.
  • Please note that these applicable environments are relative and ultimately depend on specific environment.
  • camera pixel (usually used)
  • 800W≈3840*2160
  • 600W≈3072*2048
  • 500W≈2560*1920
  • 400W≈2560*1440
  • 300W≈2048*1536
  • 200W 1080P≈1920*1080(1080P)
  • 200W≈1600*1200
  • 130W 960px≈1280*960 (960px)
  • 100W 720P≈1280*720(720P)
  • Camera Power Method
    1. Independent power supply (12V 2A)
    2. POE Power
    Camera encoding format
    1. H.264, video in this encoding format is stored normally.
    2. H.265, video encoding format is halved compared to H.264.
    3. smart265 (Haikang), video encoding format halved based on h.265.
    Night vision camera
    1. Infrared night vision (black and white screen)
    2. Starlight level (small light source has color)
    3. Full color level (nearly daylight color)
    Additional camera features
    1. Audio support
    2. Support for plug-in cards
    3. Wi-Fi support
    Camera usage scenarios
  • Hemisphere: suitable for indoor use such as homes, shops, etc.
  • Block: suitable for outdoor applications such as exterior walls, fences, etc.
  • Dome machine: suitable for public places such as shopping malls, hotels, schools, etc.
  • Fisheye: Suitable for areas with limited space such as storage rooms, secret rooms, etc.
  • Binoculars: Suitable for passenger flow counting, such as shopping malls, etc.
  • Maps. Suitable for indoor use such as home or shop.
  • Advantages and disadvantages of different cameras
  • Hemisphere: better camouflage, easier to mount on ceiling and more beautiful.
  • Installation height may be higher, pay attention to safety when installing

  • Shutter shutter: good value for money, high water resistance and temperature resistance.
  • Only one-sided screen monitoring is possible.

  • Dome Camera: The observation distance is longer, it has a zoom focal length, image is clearer, and it can also rotate 360 ​​degrees for observation.
  • As a rule, vertical bars are difficult to install and expensive.

  • Fisheye: Panoramic monitoring without dead corners.
  • Monitoring range is small.

  • Binoculars: counts passenger traffic.
  • Used for needs of passenger traffic statistics, and the price is relatively expensive.

  • Map: better camouflage and nicer appearance.
  • Okay, that's all for today! Did you learn anything after reading? Follow me and don't get lost, Xiaobai Dahao will show you more security monitoring knowledge