CCTV Knowledge 2

Question 1

What does the term 'field of view' (FOV) refer to in CCTV systems?

Accepted Answer

The angular extent of the observable area captured by the camera lens

Answer

Field of view is the angular extent of the scene that a camera lens can capture, typically measured in degrees horizontally and vertically.

Question 2

Which IP camera standard defines interoperability between cameras and video management systems from different manufacturers?

Accepted Answer

ONVIF

Answer

ONVIF (Open Network Video Interface Forum) is the industry standard that ensures interoperability between IP-based security products from different manufacturers.

Question 3

What is the primary purpose of a video motion detection (VMD) feature in a DVR or NVR?

Accepted Answer

To trigger recording or alerts when movement is detected in the video frame

Answer

Video motion detection analyzes pixel changes within a video frame and triggers recording, alarms, or notifications when movement is detected.

Question 4

In CCTV terminology, what is 'dwell time'?

Accepted Answer

The duration each camera channel is displayed before the multiplexer switches to the next

Answer

Dwell time is the length of time each camera image is displayed on a monitor before a multiplexer or switcher cycles to the next camera.

Question 5

What does 'WDR' stand for, and why is it important for CCTV cameras?

Accepted Answer

Wide Dynamic Range — allows cameras to capture detail in both bright and dark areas simultaneously

Answer

Wide Dynamic Range (WDR) technology allows cameras to produce clear images in scenes with both very bright and very dark areas, such as entrances with backlit subjects.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV Knowledge 2