What is a benefit of utilizing external IR illumination with 940 nm?
Utilizing external IR illumination with 940 nm provides the benefit of covert surveillance. IR light at 940 nm is almost invisible to the human eye, making it ideal for discreet monitoring without drawing attention to the presence of the camera. This allows for effective surveillance while remaining undetected by intruders. Axis Communications' product documentation on IR illumination confirms this advantage of 940 nm IR light.
In a dark indoor environment one single Axis illuminator is available. At a distance of 1 m (3 ft 3 in) away from the illuminator the light intensity is 1024 lux. At what distance from the light source will the light intensity be 256 lux?
The inverse square law of light intensity states that the intensity of light is inversely proportional to the square of the distance from the light source. Given that the light intensity is 1024 lux at 1 meter, we can calculate the distance at which the intensity would be 256 lux.
Since 256 lux is one-fourth of 1024 lux, and the inverse square law states that intensity is proportional to 1/d21/d^21/d2, the distance must be doubled to reduce the intensity by a factor of four. Therefore, the distance at which the light intensity is 256 lux is 2 meters. [Reference: Axis Communications - Illumination Basics]
The ONVIF standard gives the end user benefits such as (Choose two)
The ONVIF (Open Network Video Interface Forum) standard provides several benefits to end users. One key benefit is that it helps create future-proof systems and more secure investments by ensuring interoperability between different manufacturers' devices, which protects against obsolescence. Additionally, ONVIF increases flexibility and offers greater freedom of choice, allowing users to mix and match devices from different vendors, thereby tailoring their security systems to specific needs without being locked into a single manufacturer's ecosystem.
statement best describes how an ACAP works?
ACAP (Axis Camera Application Platform) analytics run directly on the device. This means that the processing and analysis of data occur on the camera itself, rather than on a separate server or in the cloud. Running analytics on the device reduces the need for additional hardware and network bandwidth, and it allows for faster decision-making and real-time alerts. This information is confirmed by Axis Communications' documentation on ACAP.
What ensures that unauthenticated, tampered firmware is blocked and rejected during start up?
Secure boot is a security feature that ensures only authenticated and untampered firmware can run on Axis devices. During the start-up process, secure boot checks the digital signature of the firmware against a trusted certificate. If the firmware has been tampered with or is not authenticated, the device will block and reject it, preventing potential security breaches. This mechanism is part of Axis' commitment to cybersecurity and is detailed in their security white papers and firmware documentation.
