CCTV Knowledge 4 — Questions and Answers
Question 1: What is the role of a video analytics engine in a modern CCTV system?
- To compress video at a higher ratio for storage efficiency
- To automatically interpret video content and generate alerts based on defined rules such as intrusion or loitering (Correct answer)
- To balance the load between multiple recording servers
- To calibrate camera lenses for optimal focus
Correct answer: To automatically interpret video content and generate alerts based on defined rules such as intrusion or loitering
Video analytics uses algorithms to automatically analyze video streams and detect events such as perimeter breaches, abandoned objects, or crowd density changes, triggering alerts without human monitoring.
Question 2: What does 'RTSP' stand for, and how is it used in IP camera systems?
- Real-Time Streaming Protocol — used to establish and control media sessions for streaming IP camera video (Correct answer)
- Remote Terminal Security Protocol — used to encrypt camera login sessions
- Recorded Time Stamp Protocol — used to synchronize timestamps on recorded footage
- Real-Time Storage Protocol — used to write video data to network-attached storage
Correct answer: Real-Time Streaming Protocol — used to establish and control media sessions for streaming IP camera video
RTSP (Real-Time Streaming Protocol) is a network control protocol used to establish and manage streaming media sessions, commonly used to access live video streams from IP cameras.
Question 3: In CCTV camera specifications, what does 'sensitivity' (measured in lux) indicate?
- The maximum recording resolution the sensor can achieve
- The minimum amount of light the camera requires to produce a usable image (Correct answer)
- The camera's ability to detect motion in low-contrast scenes
- The maximum distance at which objects can be identified
Correct answer: The minimum amount of light the camera requires to produce a usable image
Sensitivity in lux indicates the minimum light level required for the camera to produce an acceptable image; lower lux values mean the camera performs better in darker conditions.
Question 4: What is the function of a video matrix switcher in a large CCTV installation?
- To convert analog video to digital IP streams
- To allow any camera input to be routed to any monitor output in a flexible, cross-point switching arrangement (Correct answer)
- To amplify weak video signals over long cable runs
- To synchronize recording schedules across multiple DVRs
Correct answer: To allow any camera input to be routed to any monitor output in a flexible, cross-point switching arrangement
A video matrix switcher enables operators to route any camera feed to any monitor in the system, providing maximum flexibility in large control room installations.
Question 5: Which camera type is best suited for monitoring a large open area such as a parking lot perimeter with a single camera?
- Pinhole camera
- Fisheye (360°) camera (Correct answer)
- Box camera with a telephoto lens
- Dome camera with a standard fixed lens
Correct answer: Fisheye (360°) camera
A fisheye camera provides a 360° or 180° panoramic view, making it ideal for covering large open areas with a single device, though with some image distortion at the edges.
Question 6: What is 'edge storage' in the context of IP cameras?
- Recording video directly to a memory card (SD/microSD) inside the camera itself (Correct answer)
- Storing video at the outermost server in the network topology
- A feature that compresses video before sending it to the NVR
- Caching recent frames in the camera's RAM buffer
Correct answer: Recording video directly to a memory card (SD/microSD) inside the camera itself
Edge storage refers to the camera's ability to record video locally to an onboard SD or microSD card, providing backup recording if the network connection to the NVR is lost.
Question 7: What is the significance of the IP66 rating for outdoor CCTV cameras?
- The camera is certified for use at temperatures down to -66°C
- The camera is dust-tight and protected against powerful water jets from any direction (Correct answer)
- The camera supports 66 simultaneous video streams
- The camera housing is rated to withstand impacts of 66 joules
Correct answer: The camera is dust-tight and protected against powerful water jets from any direction
IP66 is an Ingress Protection rating where '6' means fully dust-tight and the second '6' means protected against powerful water jets, making it suitable for outdoor installation in most weather conditions.
CCTV Knowledge 4
What is the role of a video analytics engine in a modern CCTV system?