# 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 '****' ****, *** the**** ****** **********. *** ********* ***** 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 ** ****

*** ** ********* ********* by ***** *** ********** component ****, *.*., *** HFoV ** **°

*******, ******* ** *** HFoV ******* *** ***** area ******** ** ** the ******. *** ********, cut *** **** ** half, *** *** **** is ******* **. *********, doubling *** **** *** the **** ********* ** 400%.

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

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

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

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

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

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

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

*** ******* * ******* is **** * ******, the ***** *** ***** is ** **** *****. The ***** ** **** is ********, *** *** width ** **** / meters ********* ** *** moves ******* **** *** camera.

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

******** * ******** *******

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

Camera Focusing Tutorial on Oct 14, 2019
Camera focus is fundamental to quality imaging. Mistakes can significantly reduce details, making cameras less effective. In this guide, we...
Avigilon H5A Analytic Cameras Tested on Oct 07, 2019
Avigilon has released its H5A analytic cameras, claiming to "detect more objects with greater accuracy even in crowded scenes." We tested the...
Vivotek 4K S-Series Camera Tested on Sep 30, 2019
Vivotek's highest-end S-series camera claims "Supreme Night Visibility", "Smart IR II", "Smart Stream II", "WDR Pro for unparalleled visibility in...
Consumer IP Camera Analytics Shootout - Arlo, Google / Nest, Amazon / Ring, Hikvision / Ezviz, Wyze Cam, Yi Home on Sep 26, 2019
AI analytics are hitting the mainstream in the consumer camera market, with entrants Wyze and Yi Home releasing free people detection on their...
Hikvision Acusense Analytics Tested on Sep 23, 2019
Hikvision touts "The Magic Behind It All" in their new Acusense line are 'deep learning algorithms' inside these cameras and recorders. But how...
Axis Perimeter Defender Improves, Yet Worse Than Dahua and Wyze on Sep 19, 2019
While Axis Perimeter Defender analytics improved from our 2018 testing, the market has improved much faster, with much less expensive offerings...
Vivotek "Neural Network-Powered Detection Engine" Analytics Tested on Sep 17, 2019
Vivotek has released "a neural network-powered detection engine", named Smart Motion Detection, claiming that "swaying vegetation, vehicles passing...
Panasonic 4K Camera Tested (WV-S2570L) on Sep 13, 2019
Panasonic has released their latest generation 4K dome, the WV-S2570L, claiming "Extreme image quality allows evidence to be captured even under...
Uniview Pro 4K Camera Tested (IPC3238ER3-DVZ) on Aug 29, 2019
In our 8MP / 4K Fixed Lens Camera Shootout, Uniview's low end 8MP was firmly in the middle of the pack. Does their higher end Pro Series 4K camera...
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...

#### Most Recent Industry Reports

Altronix Claims Tango 'Eliminates Electricians' on Oct 15, 2019
Power supply provider Altronix claims its new Tango power supply 'eliminates the need for an electrician, dedicated conduit and wire runs'. In...
Hikvision Dissolves North American Business Unit, Splits Canada and USA on Oct 15, 2019
Hikvision has dissolved its North American Business Unit, splitting up US and Canada operations as the PRC-government owned manufacturer faces...
Camera Focusing Tutorial on Oct 14, 2019
Camera focus is fundamental to quality imaging. Mistakes can significantly reduce details, making cameras less effective. In this guide, we...
"UL Has Blood On Their Hands" Alleges The Interceptor / Keith Jentoft on Oct 14, 2019
"UL has blood on their hands" alleges Keith Jentoft of "The Interceptor Project". We examined The Interceptor in-depth last year, see: The...
Access Control Course Fall 2019 - Save \$50 Last Chance on Oct 14, 2019
Register Now - Fall 2019 Access Control Course. Save \$50 through October 10th. Thursday, October 17th is the last day to register. IPVM offers...
Axis HD Analog Encoder Tested on Oct 11, 2019
Two years after declaring "Everything is IP", Axis has released their first HD analog encoder, the P7304, with support for AHD, CVI, TVI, and SD...
Dahua Celebrates PRC 70th Wearing Communist Party Hammer and Sickle on Oct 11, 2019
Dahua celebrated the PRC's 70th anniversary with a video of various Dahua employees wearing China Communist Party hammer and sickle pins as shown...
Last Chance - Register Now - October 2019 IP Networking Course on Oct 10, 2019
Last Chance - Register Now - Fall 2019 IP Networking Course. The course starts next week. This is the only networking course designed...
Network Optix NxWitness 4.0 Tested on Oct 10, 2019
Network Optix released Nx Witness 4.0, proclaiming new features like a deep learning analytics metadata SDK, increased H.265 support, and UX...
HID Fingerprint Reader Tested on Oct 09, 2019
HID has released their first access reader to use Lumidigm optical sensors, that touts it 'works with anyone, anytime, anywhere'. We bought and...