3D privacy masking in Axis cameras refers to a privacy mask that changes its shape depending on the angle of view. This advanced feature ensures that the privacy mask effectively covers the designated area regardless of the camera’s viewing angle, providing consistent privacy protection as the camera moves or zooms.
Question 33
Which of the following statements are true for H.264? (Choose two)
Options:
A.
The size of an l-frame depends on the preceding P-frame
B.
Increased motion in a scene means increased bit rate
C.
Group of Video (GOV) length is directly affected by the sizes of the I- and P-frames
D.
A P-frame references preceding and succeeding P-frames
H.264 is a video compression standard that adjusts the bit rate based on the motion in the scene. Increased motion results in a higher bit rate because more data is required to accurately represent the changes between frames. Additionally, a longer Group of Video (GOV) length, which means fewer I-frames and more P-frames in a sequence, reduces the overall bit rate since I-frames are larger and require more data. References can be found in the Axis Communications documentation and technical white papers on H.264 compression.
Question 34
The term f-stop, or f-number,
Options:
A.
Relates the focal length of the lens to the zoom factor.
B.
Measures the lens' capability to focus on objects at short distance.
C.
Is the end position of the focus motor in an autofocus system.
When dealing with a poorly lit scene, adding light is the most effective option to improve image quality. Proper illumination ensures that the camera's sensor can capture clear and detailed images, reducing noise and enhancing visibility. While adjusting exposure settings, brightness, or changing camera placement can help, they are secondary to the fundamental requirement of adequate lighting.
Using VLANs and IP subnets in a network infrastructure helps segregate surveillance video traffic from other network traffic. This separation improves network security by limiting access to authorized devices only and reducing the risk of video interception by malicious users. It does not inherently provide encryption or establish encrypted communication links, but it enhances security by isolating sensitive video streams. Detailed explanations can be found in Axis Communications network design guides and security best practices documents.
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