CVSS CVSS Camera Technology & Optics 1 — Questions and Answers
Question 1: Which camera sensor type is generally preferred for low-light video surveillance applications?
- CCD (Charge-Coupled Device) (Correct answer)
- CMOS (Complementary Metal-Oxide Semiconductor)
- Infrared CMOS
- Thermal CMOS
Correct answer: CCD (Charge-Coupled Device)
CCD sensors typically produce lower noise and better image quality in low-light conditions compared to standard CMOS sensors.
Question 2: What does the term 'depth of field' refer to in surveillance camera optics?
- The maximum focal length of the lens
- The range of distances within which objects appear acceptably sharp (Correct answer)
- The angle of view of the camera
- The minimum illumination required by the sensor
Correct answer: The range of distances within which objects appear acceptably sharp
Depth of field is the zone of acceptable sharpness extending in front of and behind the plane of focus.
Question 3: A varifocal lens on a surveillance camera allows an installer to:
- Automatically adjust zoom in response to motion
- Manually adjust the focal length to change the field of view (Correct answer)
- Electronically control iris opening
- Switch between day and night modes
Correct answer: Manually adjust the focal length to change the field of view
A varifocal lens lets the installer manually set the focal length within a range, allowing field-of-view adjustment during installation.
Question 4: What is the primary advantage of a wide dynamic range (WDR) camera in a surveillance system?
- Higher frame rates in dark environments
- Ability to capture detail in both bright and dark areas simultaneously (Correct answer)
- Extended IR illumination distance
- Wider horizontal field of view
Correct answer: Ability to capture detail in both bright and dark areas simultaneously
WDR technology allows a camera to balance exposure so that detail is visible in both bright highlights and dark shadows within the same frame.
Question 5: When selecting a camera lens for license plate capture on a highway lane, which characteristic is most critical?
- Ultra-wide field of view (above 120°)
- Long focal length for narrow field of view and subject magnification (Correct answer)
- Fixed iris for consistent exposure
- Fisheye distortion correction
Correct answer: Long focal length for narrow field of view and subject magnification
A long focal length (telephoto) lens narrows the field of view and magnifies distant subjects, which is essential for capturing legible license plates from a distance.
Question 6: Which IP camera rating indicates the enclosure is dust-tight and protected against powerful water jets from any direction?
- IP54
- IP65
- IP66 (Correct answer)
- IP67
Correct answer: IP66
IP66 means complete dust protection (6) and protection against powerful water jets from any direction (6).
CVSS CVSS Camera Technology & Optics 1
Which camera sensor type is generally preferred for low-light video surveillance applications?