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The IK rating is a measure of a device's resistance to mechanical impact, making it crucial for environments where vandalism is a concern. A higher IK rating indicates better protection against physical attacks, ensuring that the camera can withstand attempts to damage it. Axis cameras designed for high-risk areas typically feature robust housings with high IK ratings, which are specified in their product datasheets and installation guides.

The most efficient method for sending a video stream to multiple recipients simultaneously is multicast. Multicast allows a single video stream to be transmitted to multiple recipients, reducing the bandwidth required compared to unicast, where separate streams are sent to each recipient. This approach optimizes network resources and ensures efficient distribution of video data. Axis Communications' networking and video streaming guidelines confirm multicast as the preferred method for such scenarios.

View areas enable multiview streaming by allowing users to stream different parts of the camera's field of view simultaneously. This includes the ability to stream both optically zoomed-in views and the full, normal views at the same time. This feature enhances monitoring flexibility and situational awareness by providing multiple perspectives from a single camera feed. Axis documentation on multiview streaming explains how view areas can be configured to deliver both zoomed and wide-angle views concurrently, facilitating comprehensive surveillance.

Privacy masks in an Axis camera can be activated and deactivated per stream profile. This allows for flexibility in managing different viewing needs and ensuring privacy in specific scenarios. Users can configure privacy masks to appear in one stream but not in another, making it a versatile feature for various applications. Axis Communications' documentation on privacy masks confirms this capability.

Typically, a system designer calculates the pixel density based on the horizontal resolution and the field of view. Pixel density is crucial in determining the level of detail a camera can capture in a specific area. Horizontal resolution refers to the number of pixels along the horizontal axis of the image sensor, while the field of view is the extent of the observable area captured by the camera. This calculation helps in ensuring that the camera setup meets the surveillance requirements.

Axis helps prevent attackers from deceiving system owners into installing altered firmware by using signed firmware. Signed firmware ensures that only authentic and unaltered firmware can be installed on the device. This process involves cryptographic signatures that verify the integrity and authenticity of the firmware, thus preventing malicious code from being introduced into the system.

AXIS Site Designer is a tool that helps in designing and planning surveillance systems. One of its key features is bandwidth and storage estimation, which allows users to calculate the required network bandwidth and storage capacity based on the selected cameras and their settings. This feature ensures that the surveillance system is properly scaled and resources are efficiently allocated. References: Axis Communications AXIS Site Designer tool documentation and user guides.

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The three types of field of view are telephoto, wide-angle, and normal. A wide-angle lens provides a broader view, a normal lens offers a standard view comparable to the human eye, and a telephoto lens allows for a narrower field of view with greater magnification. Axis Communications' technical resources detail these field of view options for different camera lenses.

Concrete has the lowest reflectance among the listed surfaces. Reflectance refers to the ability of a surface to reflect light, and concrete typically reflects less light compared to sand, grass, or snow. This characteristic is important for surveillance in terms of minimizing glare and ensuring better image quality. Axis Communications' documentation on environmental considerations supports this information.

RAID (Redundant Array of Independent Disks) and NAS (Network Attached Storage) are two common methods to extend server storage for video. RAID allows for increased storage capacity and data redundancy by combining multiple hard drives into a single logical unit, improving performance and fault tolerance. NAS provides additional storage over the network, enabling easy expansion and accessibility for video data. Both solutions are widely used in video surveillance systems to ensure ample storage and data reliability. This information is verified from Axis Communications’ best practices and technical guidelines on storage solutions for video surveillance.