Operator Flashcards

What is the purpose of a CCTV system's 'watermarking' feature?

Answer: To embed hidden data into video to verify authenticity and detect tampering

Digital watermarking embeds invisible metadata into video footage, allowing investigators to verify that the footage has not been altered or tampered with.

An operator using a DVR-based system notices the 'HDD full' warning. What is the correct immediate action?

Answer: Report the warning to the supervisor and follow the organization's retention and overwrite policy

A full HDD warning must be escalated to a supervisor so the organization's data retention policy is followed before any footage is overwritten or deleted.

What does 'frame rate' mean in the context of CCTV recording, and why does it matter?

Answer: The number of images captured per second, which affects how smoothly motion is reproduced in playback

Frame rate determines how many images are recorded per second; higher rates produce smoother video with less motion blur, which is important for identifying fast-moving subjects.

A CCTV operator receives a request from a member of the public to view footage of themselves. Under US privacy principles, what should the operator do?

Answer: Direct the person to submit a formal data subject access request through the appropriate channel

Individuals may have rights to access footage of themselves, but this must be handled through formal procedures to protect the privacy of others who may appear in the same footage.

In CCTV surveillance, what is 'signal-to-noise ratio' (SNR) most directly related to?

Answer: The clarity of a camera's image, particularly in low-light conditions

A higher SNR means the camera sensor captures more useful image data relative to electronic noise, resulting in a cleaner image especially in low-light environments.

What is the recommended approach when an operator is uncertain whether an observed situation requires a police response?

Answer: Consult the shift supervisor or follow the established decision-making protocol before calling

Operators should consult their supervisor or follow established escalation protocols when uncertain, ensuring appropriate and proportionate responses.

Which lighting condition most commonly causes a CCTV camera to produce a silhouette effect where subjects appear as dark shapes with bright backgrounds?

Answer: Strong backlight, such as a subject standing in front of a bright window or doorway

Strong backlight causes the camera's auto-exposure to adjust for the bright background, rendering foreground subjects as dark silhouettes.