Field of View (FoV) Tutorial

By: John Honovich, Published on Aug 24, 2014

Field of View, or FoV, is deceptively complex. At its most basic, it is simply what the camera can 'see' and is, therefore, visually self-evident. However, when analyzing images, comparing cameras or projecting quality, FoV subtleties can have a big impact. In this tutorial, we examine:

  • Specifying Field of View
  • Calculating Field of View
  • Measuring / Comparing the Right Field of View
  • Field of View vs Distance from Camera
  • Field of View vs Lens Length

***** ** ****, ** FoV, ** *********** *******. At *** **** *****, it ** ****** **** the ****** *** '***' and **, *********, ******** self-evident. *******, **** ********* images, ********* ******* ** projecting *******, *** ********** can **** * *** impact. ** **** ********, we *******:

  • ********** ***** ** ****
  • *********** ***** ** ****
  • ********* / ********* *** Right ***** ** ****
  • ***** ** **** ** Distance **** ******
  • ***** ** **** ** Lens ******

[***************]

Specifying ***** ** ****- **** *** ***

*** *** **** ****** terms ** ******* / communicate ***** ** **** are **** *** ***. Both *** ********* ** degrees (**°, ***°, ***°, etc.). **** ***** ** the ********** ******** *****. For ******** ** ***** surveillance, **** *** ** used ***************.

************, ***** *** *** other ***** *** **** are **** **** ******** used. ***** *** ******** FoV (****) *** ******** FoV. ***** *** ** listed ** **** ************** but ****** *** ** mixed **** **** ** AoV ** **** ******* different **********.

Seeing ***** ** *****

** *** **** ********* FoVs **** ******* **** lengths '****' ****, *** ******* ****** **********. *** ********* ***** compares ***°, ***°, **°, and **° ****** ** view ******* ** *** same ****** ***** ** a ******* *** ** show ***********.

Calculating ***** ** ****

*** ***** **** ** calculating * ******’* *** in ******* (°). *** key ****** **** ** lens ******. *** ****** the ****, *** ******** the *** / **** the ****** *** ***. One ********* *** *********** lens ****** *** *** FoV **** ******.

*** ****, ****** *********** ** **** ********** ******** **** ** depth. **** *** ********** lens ******, *** *** calculate ******** *** **** **********.

*******, ******* **** *** alone ** ************ ** you **** ** ********** how ** ******* ** other ******* *** ******* within *** ***.

FoV ** ****

*** ** ********* ********* ** using *** ********** ********* only, *.*., *** **** is **°

*******, ******* ** *** HFoV impacts *** ***** **** captured ** ** *** amount. *** ********, *** the **** ** ****, and *** **** ** reduced **. *********, ******** the **** *** *** area ********* ** ***%.

***** ******* ***° ** 60° ****. ****** **** the **** ******* ** 4x:

Measuring / ********* ***

*** **** ****** *** problem ** *** ** comparing ******* **** ********* FoVs. **** ** *** cameras *** ********* *** are ******* ** *** same ******, *** ****** with *** ***** *** will ****** ‘****’ ***** than *** ***** ***. Likewise, ** *** **** to ******** **** * preferred ****** **** ******, show **** ****** ** a ******** *** (*** the******* **** ** *******).

*** ********** ***** ***** two ********* **** ***** swapped:

comp fov

** **** *** **** to ** ****** ************. Often, ****** **** ****** test *** ********* ******* at *** ********* ***** and *** ****** **** the *** ** *** cameras *** *** ****.

* ***** *** *** result **** * ******* lens ****** ** * subject ******* **** *** camera, ********* *****.

Field ** **** **. ****** ********

*** ******* * ******* is **** * ******, the ***** *** ***** is ** **** *****. The angle ** **** ** ********, but *** ***** ** feet / ****** ********* as *** ***** ******* from *** ******.

**** ** *********** * mathematical ***. *** *** see ** ********** ** the ***** ***** ****:

*

****'* ** ******** **** that ************ *** **** principle / *****:

******* ** ****, ***** important ******* **** ** remembered:

  • ***** ** ** ****** FoV *****. ***** ****** often ***** ****, ** is * ********* ********** because *** **** **** where ** *** *** a ****** **. ****** simply *** "*** ***** is *" ** **********.
  • ** ****** *** *** width, *** **** **** the *******'* ******** **** the ******. ** ******** define ****, *** "*** FoV ******* * ** * **** the ******."
  • **** **** *** ********** the ******** ***** **** from *** ****** *** wants ** *******. ** definition, **** **** ** the ****** *** *** the **** ****** ** have ******** ********** ********** details. ** ********* ** the *** ** *** wide, ****** ** * *********.

Field ** **** ** **** ******

*** **** **** * shorter **** ****** ******** the ***, ** **** accelerates *** **** *** FoV ********* ** *** subject’s ******** **** *** camera *********. ***’* ******* a *******/********* *** **** a ***** ********* *** to **** **** ********* in ******:

*** * *** / fisheye ******, ***** * foot * ******* ** further **** *** ******, the *** ********* ~* feet (** *** *** is *** ********* ** a ******). ** **** 10 ****, *** *** is **** **** ** feet ****.

** ********, *** * super ********* ****, ***** 1 **** * ******* is ******* **** *** camera, *** *** *** only ******** *** **** or ******* ** * foot. ******* ** ****, a ******* *** ** 10 **** ****** ******* will **** * **** similar *** **** * super ********* **** *** likely ******* ****** ********. This ** ***** ******** of *** ******* / 360 ******.

******* ** **** ****:

  • ** **** ******* **** fisheye ** ***** **** angle ****** ** *** FoV **** ****** *******, capturing ******* ******* ****** their **** *****.
  • ***** ***** ********* ****** deliver * *** ***** that ******* ******, ******* depth ** ***** (***) becomes * *** ****. This **** **** ***** deliver *** ********* **** but ***** ** *** of *****. *** ******** ** ***** ******** for *******.

**** *****, **** ******* with ‘******’ ** ****** lenses (** *** *** to *** *****) **** have ***** *** ***** ~1 **** *** ***** 1 **** ******** ** subject ******** **** *** camera. *******, ** *** extremes, *** ********** ** FoV ********* *** **** dramatically (*.*., ******* *** super *********).

Field ** **** ** ****** ****

****** **** **** ******* FoV. *******, ** ********, for ************, **** ** typically *** * ***** factor ** ********* ***** imager ***** **** ** be ******.

** ** ***** ***********, the ****** *** ******, the ***** *** *** will **, ********** **** being *****. **** ** covered **** ** *** ************ ****** ****** ******** *** *** ** ************ with ** ********* **********.

[****: **** ******** *** originally ********* ** **** but *** ************* ******* in ****]

Test **** *********:

**** **** * ******** **** ***

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports

Anyvision Facial Recognition Tested on Aug 21, 2019
Anyvision is aiming for $1 billion in revenue by 2022, backed by $74 million in funding. But does their performance live up to the hype they have...
Dahua 4K Camera Shootout on Aug 20, 2019
Dahua's new Pro Series 4K N85CL5Z claims to "deliver superior images in all lighting and environmental conditions", but how does this compare to...
Verkada People And Face Analytics Tested on Aug 16, 2019
This week, Verkada released "People Analytics", including face analytics that they describe is a "game-changing feature" that "pushes the...
Axis 4K Camera Shootout 2019 on Aug 14, 2019
Axis' 4K Q3518-LVE claims the "best video quality possible", with Lightfinder super low light performance, Axis' high end Forensic WDR, and...
Lens Iris Tutorial on Aug 08, 2019
Cameras, like humans, have irises, controlling the light which hits the imager and impacting image details. However, cameras have multiple types of...
Dahua Analytics+ Tested on Aug 07, 2019
Dahua's analytics have performed poorly in past shootouts. But now, they claim their new Analytics+ "algorithms significantly improve accuracy and...
Bosch Starlight 8000i Cameras Tested on Jul 23, 2019
Bosch has released their new Flexidome IP Starlight 8000i cameras, claiming "exceptional detail even in extreme low-light situations." To see...
Axis ARTPEC-7 P1375-E Camera Tested on Jul 12, 2019
Axis claims the new P1375-E box camera with ARTPEC-7 chip delivers "clear, sharp images in any lighting condition." But how well does it do? We...
Lens Focal Length Tutorial on Jul 10, 2019
3mm, 6mm, 2.8 - 9mm, 5 - 50mm, etc. Camera specifications often list lens lengths but what do they mean? These metrics are important in...
Hikvision ColorVu Camera Tested on Jun 24, 2019
Hikvision says their new ColorVu line captures "vivid chromatic images in darkness", with unconventional white light illuminations whereas most...

Most Recent Industry Reports

Anyvision Facial Recognition Tested on Aug 21, 2019
Anyvision is aiming for $1 billion in revenue by 2022, backed by $74 million in funding. But does their performance live up to the hype they have...
JCI Sues Wyze on Aug 21, 2019
The mega manufacturer / integrator JCI has sued the fast-growing $20 camera Seattle startup Wyze. Inside this note: Share the court...
Dahua 4K Camera Shootout on Aug 20, 2019
Dahua's new Pro Series 4K N85CL5Z claims to "deliver superior images in all lighting and environmental conditions", but how does this compare to...
ZK Teco Atlas Access Control Tested on Aug 20, 2019
Who needs access specialists? China-based ZKTeco claims its newest access panel 'makes it very easy for anyone to learn and install access control...
Uniview Beats Intel In Trademark Lawsuit on Aug 19, 2019
Uniview has won a long-running trademark lawsuit brought by Intel, with Beijing's highest court reversing an earlier Intel win, centered on...
Suprema Biometric Mass Leak Examined on Aug 19, 2019
While Suprema is rarely discussed even within the physical security market, the South Korean biometrics manufacturer made global news this past...
Verkada People And Face Analytics Tested on Aug 16, 2019
This week, Verkada released "People Analytics", including face analytics that they describe is a "game-changing feature" that "pushes the...
Dahua OEM Directory 2019 on Aug 16, 2019
US Government banned Dahua OEMs for dozens of companies. The following directory includes 40+ of those companies with a graphic and links to...
Installation Course - Register Now on Aug 15, 2019
Register Now for the September 2019 Video Surveillance Install Course. This is a unique installation course in a market where little practical...
Axis Suffers Outage, Provides Postmortem on Aug 15, 2019
This week, Axis suffered an outage impacting their website and cloud services. Inside this note, we examined what happened, what was impacted...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact