CCTV Video Surveillance System Design 2

Question 1

What is the primary purpose of conducting a site survey before designing a CCTV system?

Accepted Answer

To identify coverage gaps, lighting conditions, and mounting locations

Answer

A site survey identifies physical layout, lighting, obstructions, and ideal camera placement to ensure complete coverage with no blind spots.

Question 2

Which camera placement strategy is most effective for monitoring a long, narrow corridor?

Accepted Answer

Placing a camera at each end of the corridor aimed inward

Answer

End-mounted cameras aimed down the length of a corridor capture the full length with maximum depth of field and clear facial images.

Question 3

What does 'field of view' (FOV) refer to in camera selection for system design?

Accepted Answer

The angular extent of the scene captured by the camera lens

Answer

Field of view is the angular extent of the observable area captured by a lens, typically measured in degrees horizontally and vertically.

Question 4

When designing a system for a parking lot, which camera type is most commonly recommended to cover wide areas efficiently?

Accepted Answer

Wide-angle or fisheye cameras

Answer

Wide-angle or fisheye cameras maximize coverage area per camera, reducing the number of units needed for large open spaces like parking lots.

Question 5

What is the significance of the 'overlap zone' in a multi-camera CCTV design?

Accepted Answer

It indicates areas where two cameras share coverage, eliminating blind spots

Answer

Overlap zones ensure that if one camera is obstructed or fails, the adjacent camera still captures activity in that area, preventing coverage gaps.

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