Axis Communications ANVE - Axis Network Video Exam

Multicast video streaming has several important characteristics:

A. Multicast can help to save bandwidth in a network because it allows the same video stream to be delivered to multiple users simultaneously, reducing the need for multiple unicast streams.

B. Multicast can typically not be used to provide video over the internet because many routers and firewalls do not support multicast traffic across the internet, which is more suited for local network environments.

D. Multicast extends the viewer capacity of a camera or an encoder from 10-20 to an unlimited number, as it does not rely on multiple individual connections to distribute the video stream.

Exposure time can become a limiting factor for the camera in delivering full frame rate. Longer exposure times allow more light to hit the camera sensor, improving image quality in low light conditions but also reducing the number of frames per second (fps) that the camera can capture. Shorter exposure times allow higher frame rates but may result in underexposed images in low light conditions.

H.264 compression technology is designed to be more efficient than Motion JPEG, especially at higher frame rates. This is because H.264 uses inter-frame compression, which reduces redundancy by encoding differences between successive frames, leading to significant bandwidth savings. Motion JPEG, on the other hand, compresses each frame independently, resulting in higher bandwidth usage. [Reference: Axis Communications - Video Compression Technologies]

The AXISP7214 encoder is designed to support multiple video streams per channel and is capable of delivering high frame rates and resolutions, such as D1 resolution at 30 fps in H.264 format. This encoder can handle the strict requirements of delivering 30 fps for recorded video while managing three streams per channel. Axis Network Video documentation specifies that the AXISP7214 is optimized for high-performance video encoding, making it suitable for applications demanding multiple streams and high frame rates.

Incorrect colors due to faulty calibration or configuration in network cameras can lead to a false representation of the video footage. This is because the colors captured and displayed by the camera do not accurately reflect the actual scene, which can be critical in surveillance applications where precise color reproduction is necessary for identification and evidence purposes. While other options could be related issues, they do not directly address the primary consequence of incorrect color calibration. For more detailed information, refer to Axis Communications' technical notes on camera calibration and color accuracy.

To utilize IEEE 802.1X for connecting a camera to the network, the following are required:

A. An Ethernet switch with support for IEEE 802.1X, which ensures that only authorized devices can connect to the network.

C. A RADIUS server, which is used to manage authentication, authorization, and accounting (AAA) for network access control.

These components are essential for setting up secure network access using IEEE 802.1X.

To identify people with 80 pixels per face in a hallway that is 2.5 meters wide, a minimum resolution of 1280x720 (720p) is needed. This resolution ensures sufficient pixel density to capture detailed facial features necessary for identification purposes. Given the width of the hallway and the required pixel density, 720p provides the necessary coverage and detail.

Infrared (IR) illuminators with a wavelength of 940 nm do not produce any visible glow. This wavelength is completely invisible to the human eye, making it ideal for covert surveillance applications where the presence of IR illumination needs to be undetectable. Other wavelengths like 650 nm, 750 nm, and 850 nm can produce a faint red glow that may be visible in low light conditions.

Motion blur in recordings is typically caused by a slow shutter speed, which allows the camera sensor to capture light for a longer period, resulting in blurred images of moving objects. Increasing the shutter speed reduces the exposure time, which helps to freeze motion and reduce blur. Adjusting the shutter speed is the most effective way to address motion blur in fixed cameras. [Reference: Axis Communications - Image Quality Settings]

Axis recommends shielded cables for outdoor installations primarily to ensure surge protection. Shielded cables help to protect the system against electrical surges and electromagnetic interference, which can cause damage to the cameras and other connected devices. By using shielded cables, the integrity and reliability of the surveillance system are maintained, even in environments prone to electrical disturbances. [Reference: Axis Communications - Installation and Maintenance of Network Video Products]

Top of Form

Bottom of Form