CCTV Video Surveillance System Design 5

Question 1

What is the key advantage of using PTZ (Pan-Tilt-Zoom) cameras in a surveillance system design?

Accepted Answer

They can cover a large area and zoom in on incidents under operator control or via automation

Answer

PTZ cameras provide flexible, wide-area coverage with the ability to zoom in on specific incidents, making them ideal for large open areas with active monitoring.

Question 2

In a risk-based CCTV design approach, which area would typically be classified as 'high risk' requiring the most camera coverage?

Accepted Answer

A loading dock with high-value goods and frequent external access

Answer

Loading docks combine high-value assets, external personnel access, and limited supervision, making them high-risk zones that require intensive camera coverage.

Question 3

What does 'pixels per foot' (PPF) or 'pixels per meter' measurement determine in CCTV design?

Accepted Answer

The image detail available for a given subject size, determining if identification is possible

Answer

PPF/PPM defines how much image detail is available for a target at a given distance, directly determining whether the system can detect, recognize, or identify a person.

Question 4

When a designer specifies 'detection' level coverage versus 'identification' level coverage, what is the main difference?

Accepted Answer

Detection confirms presence of a person; identification captures enough detail to recognize who the person is

Answer

Detection verifies that a person or object is present in an area, while identification requires sufficient image resolution to distinguish specific facial or physical features.

Question 5

What redundancy measure is commonly designed into critical CCTV systems to prevent total recording loss during a power outage?

Accepted Answer

Uninterruptible Power Supplies (UPS) and/or backup generators

Answer

UPS units provide immediate battery backup during power interruptions, while generators ensure long-term operation, preventing gaps in critical surveillance recording.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV Video Surveillance System Design 5