Network Video Systems Quiz
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Questions and Answers

What is the primary advantage of using cameras with P-Iris or i-CS lenses?

  • Higher light sensitivity
  • Better iris control for image quality (correct)
  • Lower manufacturing cost
  • Greater pixel resolution

What is the effect of using a smaller pixel size in a camera's sensor?

  • Reduced light capture ability (correct)
  • Increased image quality in low light
  • Improved color fidelity
  • Decreased resolution

Which resolution typically strikes a balance between quality and light sensitivity in cameras?

  • 8.5 megapixels
  • 1 megapixel
  • 2 megapixels
  • 4 megapixels (correct)

What is the purpose of thermal cameras in surveillance systems?

<p>To detect subjects in complete darkness (B)</p> Signup and view all the answers

Which resolution corresponds to HD 1080p?

<p>1920x1080 pixels (A)</p> Signup and view all the answers

What is a potential drawback of increasing the number of pixels in a camera sensor of the same size?

<p>Lower image quality in low-light conditions (B)</p> Signup and view all the answers

What color aspect ratio do cameras supporting HD resolutions generally adhere to?

<p>16:9 (C)</p> Signup and view all the answers

What distinguishes thermal cameras from conventional cameras?

<p>Ability to detect thermal radiation (D)</p> Signup and view all the answers

What is one primary advantage of remote accessibility in network video systems?

<p>Multiple authorized users can view live and recorded video from any location. (D)</p> Signup and view all the answers

How does video analytics enhance the functionality of network cameras?

<p>By extracting useful information and triggering automatic actions. (A)</p> Signup and view all the answers

What does easy integration of network video products into various systems primarily rely on?

<p>Open standards. (B)</p> Signup and view all the answers

What type of lens provides a larger field of view than the human eye?

<p>Wide angle lens (B)</p> Signup and view all the answers

What is a key benefit of the scalability of network video systems?

<p>It allows for the addition of devices without major infrastructure changes. (C)</p> Signup and view all the answers

Which lens type is most similar to the central field of view of the human eye?

<p>Normal view lens (C)</p> Signup and view all the answers

How can network video systems ensure reliability and security as they grow?

<p>By employing redundant servers in separate locations. (C)</p> Signup and view all the answers

What factor contributes to the cost-effectiveness of IP surveillance systems?

<p>They typically have a low total cost of ownership. (C)</p> Signup and view all the answers

What effect does a lower f-number have on image capture?

<p>Improves low-light image quality (A)</p> Signup and view all the answers

How does the focal length affect the f-number in a zoom lens?

<p>Longer focal length results in a higher f-number (D)</p> Signup and view all the answers

What role does deep learning algorithms play in video analytics?

<p>They help in the detection and classification of objects within video. (A)</p> Signup and view all the answers

Which component is NOT typically a feature of network video systems?

<p>Mandatory reliance on older analog technology. (A)</p> Signup and view all the answers

What is a characteristic of a fixed iris lens?

<p>Iris size cannot be changed (B)</p> Signup and view all the answers

Which of the following best describes the primary function of the iris in a lens?

<p>To control light entering the camera (D)</p> Signup and view all the answers

What happens to the depth of field when using a higher f-number?

<p>It increases (C)</p> Signup and view all the answers

What technology allows network video devices to receive power and data simultaneously through one cable?

<p>Power over Ethernet (PoE) (C)</p> Signup and view all the answers

Which of the following is a feature of Axis Edge Vault that enhances cybersecurity?

<p>Signed operating system (B)</p> Signup and view all the answers

Which of the following is NOT a type of iris commonly found in security lenses?

<p>Digital iris lens (C)</p> Signup and view all the answers

Which method can be used for securing communication in network video devices?

<p>IP address filtering (A)</p> Signup and view all the answers

What is a significant advantage of migrating from an analog video installation to a network video system?

<p>Access to digital benefits (B)</p> Signup and view all the answers

What is one of the primary applications of network video technology?

<p>Remote monitoring and security surveillance (D)</p> Signup and view all the answers

What role do video encoders play in the migration to network video systems?

<p>They create compatibility between analog and digital systems (B)</p> Signup and view all the answers

Which of the following features help minimize a network device's exposure to cybersecurity risks?

<p>Secure boot (C)</p> Signup and view all the answers

What is one benefit of using industry-standard, open systems-based servers for network video applications?

<p>Flexibility in management and equipment costs (D)</p> Signup and view all the answers

What is a key benefit of image stabilization in surveillance cameras?

<p>It requires less bandwidth and storage resources. (B)</p> Signup and view all the answers

Which method of image stabilization relies on gyroscopes or accelerometers?

<p>Optical image stabilization (OIS) (B)</p> Signup and view all the answers

What is a disadvantage of optical image stabilization (OIS)?

<p>It can be significantly more expensive. (D)</p> Signup and view all the answers

How does electronic image stabilization (EIS) typically function?

<p>By modeling camera motion with algorithms to correct images. (D)</p> Signup and view all the answers

What distinguishes Axis's EIS from other forms of electronic stabilization?

<p>It combines gyroscopic data with algorithms. (D)</p> Signup and view all the answers

Why is optical image stabilization particularly useful for cameras with long focal lengths?

<p>It is more stable at high zoom levels. (C)</p> Signup and view all the answers

What feature do Axis outdoor-ready products have that aids in installation?

<p>They use captive screws that won't fall out. (B)</p> Signup and view all the answers

What is the main advantage of using a hybrid stabilization method in Axis cameras?

<p>It effectively distinguishes between physical and perceived motion. (A)</p> Signup and view all the answers

What is a major advantage of laser focus in camera systems?

<p>It can quickly focus on moving objects. (A)</p> Signup and view all the answers

What flexibility does the PTRZ feature provide for camera operation?

<p>It enables recording while adjusting the camera's viewpoint. (D)</p> Signup and view all the answers

In what conditions is the removable IR-cut filter most beneficial?

<p>In low-light situations for capturing black and white images. (C)</p> Signup and view all the answers

What is the typical wavelength range for near-infrared (NIR) light that camera sensors can detect?

<p>700–1000 nanometers (nm) (C)</p> Signup and view all the answers

What happens to the camera's images when the IR-cut filter is removed?

<p>The camera can take advantage of ambient NIR light. (C)</p> Signup and view all the answers

Why might cameras with removable IR-cut filters be preferred in surveillance?

<p>They allow for effective monitoring even in total darkness. (A)</p> Signup and view all the answers

What is one characteristic of PTZ cameras enhanced by laser focus?

<p>They can maintain focus while the view changes dynamically. (A)</p> Signup and view all the answers

Which of the following accurately describes the functionality of an IR-cut filter?

<p>It blocks near-infrared light to improve daytime image quality. (C)</p> Signup and view all the answers

Flashcards

Remote Accessibility in Network Video

The ability to access video feeds from anywhere with an internet connection. This allows multiple users, such as security staff, law enforcement, or alarm monitoring centers, to view live and recorded footage.

Video Analytics

Extracting meaningful data from video feeds, such as detecting motion, recognizing faces, or identifying objects.

Easy Integration in Network Video

Using open standards to easily connect cameras, software, and other systems for a cohesive security solution.

Scalability & Flexibility in Network Video

The ability to add more cameras, sensors, and devices to your security system without major changes to your network.

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Unified Network in Network Video

Using the same network infrastructure for video, audio, commands, and data. One cable for everything.

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Cost-effectiveness of Network Video

Network video systems are designed to be cost-efficient over time, with lower initial costs and reduced maintenance compared to traditional systems.

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Automatic Actions in Network Video

Real-time alerts and automated actions can be triggered by specific events, such as a motion detection or a door alarm.

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Deep Learning in Video Analytics

Using advanced algorithms to identify and categorize objects in video, improving search accuracy and efficiency.

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Network Video System Cost Efficiency

Network video systems reuse existing infrastructure for video transmission, lowering costs compared to traditional CCTV systems.

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Power over Ethernet (PoE)

Network video devices are powered by PoE, allowing power and data to travel on the same Ethernet cable.

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Network Video Security Features

Network video devices can be secured using user authentication, IP filtering, encryption, and access level control.

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Axis Edge Vault

Axis Edge Vault provides hardware-based security features like secure boot, signed OS, and video verification.

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Analog to Network Video Migration

Analog CCTV systems can be migrated to a network video system using video encoders and adapters.

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Network Video Applications

Network video is used for security surveillance and remote monitoring of people, places, and operations.

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Network Video Analytics

Network video analytics enhance business efficiency by using video data for insights.

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Network Video Retail Applications

Applications in retail include security, customer behavior analysis, and inventory management.

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Image Stabilization

A technique that reduces the effects of camera shake, making videos more stable and clearer, especially when using powerful zoom lenses.

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Optical Image Stabilization (OIS)

A method of image stabilization that uses gyroscopes or accelerometers to detect and measure camera vibrations. Effective for long focal lengths and low light conditions.

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Electronic Image Stabilization (EIS)

A method of image stabilization that uses algorithms to analyze and correct camera motion. Cost-effective but can sometimes mistake object movement for camera shake.

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Axis EIS

A hybrid image stabilization method that combines gyroscopes and algorithms for reliable and accurate stabilization. It works effectively across a wide range of vibration frequencies and amplitudes.

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Outdoor-Ready

The ability of a camera to be easily installed and used in outdoor settings. Often includes features like built-in weatherproofing and captive screws for secure mounting.

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Captive Screws

Screws that have a special design to prevent them from coming out of their holes, making installation more secure.

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Ease of Installation

Features that make a product easy to use and set up, reducing the risk of errors during installation.

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Wide Angle Lens

A lens that provides a wider field of view than what is normal for the human eye.

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Normal View Lens

A lens that provides a similar field of view as the human eye's central field of view.

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Telephoto Lens

A lens that provides a narrower field of view and a magnifying effect compared to human vision.

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F-number

The ratio of a lens's focal length to the diameter of its entrance pupil. It determines how much light passes through the lens.

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Light Gathering Ability

The ability of a lens to gather light. A lower f-number means more light can reach the sensor.

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Iris

The adjustable part of the lens that controls the amount of light entering the camera.

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Fixed Iris Lens

A type of lens where the iris opening cannot be adjusted.

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Varifocal or Zoom Lens

A type of lens where the f-number changes when the focal length is changed.

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Camera Resolution

The number of pixels on a camera's image sensor determines the resolution of the captured image. A higher resolution generally allows for better detail and wider coverage.

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Megapixel Sensor

A camera with a megapixel sensor produces images with at least one million pixels, offering higher detail and wider coverage.

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Resolution vs. Light Sensitivity

While higher resolution is generally desired, increasing the number of pixels in a sensor of the same size can lead to smaller pixels, reducing light sensitivity and image quality, especially in low-light conditions.

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4MP Sensor

A camera with a 4MP sensor often strikes a balance between high resolution and good light sensitivity, as it provides larger pixels without needing a bigger, more expensive sensor.

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P-Iris and i-CS Lenses

P-Iris and i-CS lenses offer better iris control, which is important for capturing high-quality images in various lighting conditions.

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Thermal Imaging Cameras

Thermal imaging cameras do not require visible light to function. Instead, they detect the thermal radiation emitted by objects, allowing them to capture images in complete darkness, smoke, or fog.

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Applications of Thermal Imaging

Thermal cameras are useful for detection purposes in surveillance, as they can see through darkness, smoke, or fog and aren't affected by strong lights.

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Thermal Cameras as a Complement

Thermal cameras can be used as complementary tools alongside conventional cameras in surveillance systems, enhancing the overall effectiveness in various conditions.

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Laser Focus

A focusing method using laser beams to quickly achieve focus, especially beneficial in low light conditions and when capturing moving subjects.

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Remote PTRZ

A camera feature that allows for remote control of panning, tilting, rolling, and zooming, providing flexibility in adjusting the viewing angle.

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IR-Cut Filter

A filter that blocks infrared light, enabling cameras to capture colors visible to the human eye during the day.

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Day/Night Camera

A type of camera with a removable IR-Cut filter, allowing it to switch between color video during the day and black and white video at night.

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Near-Infrared (NIR) Light

Electromagnetic radiation with wavelengths longer than those of visible light, often used for night vision.

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Sensor Sensitivity

The ability of a camera sensor to detect and respond to different wavelengths of light.

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Sensor Response Range

The range of wavelengths that a camera sensor is most responsive to, determining its ability to capture different colors.

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Focusing

The process of adjusting the camera's lens to focus on a specific subject, especially useful in low light or with moving subjects.

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Study Notes

Technical Guide to Network Video

  • This document is a technical guide to network video surveillance technologies and factors to consider for successful deployment.
  • The guide was published in November 2024 by AXIS Communications.
  • The guide aims to support users in their work with Axis network video surveillance systems and to help them stay up-to-date with the changing technology landscape.
  • The guide is intended as a comprehensive resource for anyone involved in developing, implementing, and maintaining Axis video surveillance systems.
  • It provides a complete overview of network video surveillance and covers recent developments in cloud and video management systems (VMS).

Table of Contents

  • The document includes sections on network video overview, benefits, applications, network cameras, camera features, types of network cameras (box, bullet, dome, panoramic, modular), camera elements (light sensitivity, lenses, exposure control, image sensors, etc.), video encoders, video resolutions, video compression, audio, radar, access control, network technologies, network intercoms, wearables, video analytics, and cloud technologies.
  • Each numbered section has subsections with page numbers. e.g., 1. Network video: overview, benefits, and applications. 1.1 Overview of a network video system, etc.

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Technical Guide to Network Video Surveillance (PDF)

Description

Test your knowledge on network video systems including camera resolutions, lens types, and the advantages of using specific technologies like P-Iris and thermal cameras. This quiz covers key concepts that enhance surveillance functionality and accessibility in modern video systems.

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