CCTV Camera Technology and Optics Flashcards
6 cards from real CCTV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCTV Camera Technology and Optics flashcards as text
What is infrared (IR) cut filter used for in a day/night CCTV camera?
Answer: To remove IR light during daytime to improve color accuracy
The IR cut filter is mechanically removed at night to allow infrared light to reach the sensor, and is present during the day to maintain accurate color reproduction.
Which camera feature allows automatic horizontal tracking of a moving subject?
Answer: Auto tracking PTZ
Auto tracking PTZ cameras use video analytics to automatically pan, tilt, and zoom to follow a moving subject across the camera's field of view.
What is the purpose of Back Light Compensation (BLC) in CCTV cameras?
Answer: To improve visibility of subjects in front of bright backgrounds
BLC adjusts the exposure for a specific area of the image to prevent subjects in front of bright light sources from appearing as silhouettes.
A CCTV camera rated IP66 is protected against:
Answer: Powerful water jets and dust ingress
IP66 rating means the camera is fully dust-tight (6) and protected against powerful water jets from any direction (6).
What is the function of 'auto iris' in a CCTV camera lens?
Answer: Automatically adjusts aperture to maintain consistent exposure
An auto iris lens automatically adjusts the aperture opening in response to changing light levels to maintain proper image exposure.
Which of the following best describes a 'covert' CCTV camera?
Answer: A camera disguised or hidden to avoid detection
Covert cameras are intentionally concealed within everyday objects or disguised to avoid detection by subjects under surveillance.