CVSS CVSS Camera Technology & Optics 2 — Questions and Answers
Question 1: What does the 'minimum illumination' specification on a camera datasheet indicate?
- The maximum lux level before the sensor overexposes
- The lowest light level at which the camera can produce a usable image (Correct answer)
- The required lux output of an IR illuminator
- The minimum ambient light needed for auto-iris operation
Correct answer: The lowest light level at which the camera can produce a usable image
Minimum illumination specifies the lowest light level (in lux) at which the camera can still produce a recognizable image.
Question 2: A PTZ camera's 'preset' function is used to:
- Lock the camera in a fixed position permanently
- Store and recall specific pan, tilt, and zoom positions quickly (Correct answer)
- Set the maximum zoom magnification limit
- Define the camera's home position only
Correct answer: Store and recall specific pan, tilt, and zoom positions quickly
Presets save specific PTZ coordinates so the camera can instantly return to programmed positions on command or schedule.
Question 3: In a multi-megapixel camera system, what trade-off must a designer consider when increasing resolution?
- Higher resolution always reduces storage requirements
- Higher resolution requires more bandwidth and storage (Correct answer)
- Higher resolution eliminates the need for WDR
- Higher resolution reduces the need for lens quality
Correct answer: Higher resolution requires more bandwidth and storage
Megapixel cameras produce larger image files, which directly increases bandwidth consumption and storage capacity requirements.
Question 4: What is 'back focal length' (BFL) adjustment critical for when installing a CS-mount lens on a C-mount camera body?
- Setting the correct optical zoom range
- Ensuring the focal plane aligns with the sensor surface for proper focus (Correct answer)
- Configuring the auto-iris voltage
- Setting the minimum object distance
Correct answer: Ensuring the focal plane aligns with the sensor surface for proper focus
The 5mm difference between C-mount and CS-mount requires a C-ring adapter or BFL adjustment to bring the focal plane onto the sensor correctly.
Question 5: Which camera type uses a single sensor with a beam splitter to produce full-color video at all light levels?
- Day/Night (ICR) camera
- 3-CCD camera (Correct answer)
- Thermal hybrid camera
- Bayer filter CMOS camera
Correct answer: 3-CCD camera
A 3-CCD camera splits incoming light into red, green, and blue components directed to three separate sensors, delivering accurate color at low light.
Question 6: In CVSS terminology, what is the function of an IR cut filter (ICR) in a day/night camera?
- Block visible light to allow only infrared imaging at all times
- Mechanically switch in/out of the optical path to enable color by day and monochrome IR sensitivity by night (Correct answer)
- Reduce lens flare from IR illuminators
- Filter out UV wavelengths to improve color accuracy
Correct answer: Mechanically switch in/out of the optical path to enable color by day and monochrome IR sensitivity by night
The ICR filter is present during daytime to block IR (which skews color), then removed at night to allow IR light onto the sensor for improved sensitivity.
CVSS CVSS Camera Technology & Optics 2
What does the 'minimum illumination' specification on a camera datasheet indicate?