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</p> Signup and view all the answers

    Which resolution corresponds to HD 1080p?

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

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

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

    What distinguishes thermal cameras from conventional cameras?

    <p>Ability to detect thermal radiation</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.</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.</p> Signup and view all the answers

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

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

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

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

    What is a characteristic of a fixed iris lens?

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

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

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

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

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

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

    <p>Remote monitoring and security surveillance</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</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</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</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.</p> Signup and view all the answers

    Which method of image stabilization relies on gyroscopes or accelerometers?

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

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

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

    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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