Glossary

ALL TOTAL 107 COUNT
27 [N] Notification

Sometimes called callback. It is a feature of NVR that the NVR notifies the operator for a pre-programmed conditions. There are many different notification methods: callback to iRAS, push notification to smart phone remote applications, or email notifications.

26 [R] Remote application

Remote application used to connect to NVR for watching live video or playing recorded video. There are many different Remote apps running on different platforms, such as Windows PC, Mac OS X(??), iOS or Android devices. Features maybe different from one another.

25 [M] Multiple exposure

Multiple exposures is done for each pixel during 1/30 seconds, and the they are saved in a frame buffer to be processed to produce wide dynamic range pictures which shows over/under exposed area details. There is a slight difference of the time when these multiple exposures were sampled causing some artifacts for fast moving objects causing blurring. But over all, these artifacts are not very serious when the scene requires a wider dynamic range like an office camera facing the office window, or supermarket entrance door where strong back light is expected during the day time.

24 [S] Shutter

Traditional film cameras have a mechanical shutter. Electronic cameras do not have a mechanical shutter, but it can mimic the effect of the mechanical shutter by reading the pixel signal and then resetting the pixel for the next scene. Typically in IP cameras, a rolling shutter is used which reads and resets each pixel in a very fast serial manner. Thus one image is comprised of pixels sampled from ever so slightly different time. There are some artifacts for very fast moving objects.

23 [A] Aperture

It is the hole on the iris of the lens specified in F stop number of the lens. The bigger the hole is the more light can pass, the lower F number, but the shallower the field of depth. The smaller the hole is the other way around.

22 [E] Exposure

Amount of light given to the camera sensor. the exposure is controlled by the aperture (iris) and the shutter speed. the longer exposure, the more light the sensor can gather. But it has to be less tha 1/30 seconds to produce 30ips images. the longer the exposure, the more likely to have motion blur. automatically controlled by camera, but can be adjusted to go over 1/30 seconds in a low light environment.

21 [K] Keyboard

Often called Joystick. It is a device used to control VMS systems or PTZ cameras. Legacy keyboard most often uses serial communications like RS485 to communicate with different decives. Most IP keyboards use IP communication instead, but often come with RS485 interface as well.

20 [P] PTZ camera

Pan Tilt Zoom camera. Typically, PTZ camera has a zoom/auto focus camera module on a robotic pan/tilt module. Most PTZ camera comes with many independent features such as preset, tour, pattern, panning, homing fuction, and alarm association. But mostly used in conjunction with a VMS system to control the camera in live watch/monitoring mode using a device called Keyboard/Joystick. Legacy PTZ cameras are typically controlled using a vendor specific protocol over serial communication or coaxitron. Most IP PTZ cameras use IP communication instead but often come with RS485 interface as well.

19 [U] UTP cable

Unshielded Twisted Pair cable, braided with other cables. Afforadable compared to Coaxial cables.

18 [1] 12VDC

12V DC power. Check the Amp spec for the device and polarity when connecting the power to the device.