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:

comp fov

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

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

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