Field of View (FoV) Tutorial

Author: 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

***** ** ****, ** ***, ** *********** *******. ** *** most *****, ** ** ****** **** *** ****** *** '***' and **, *********, ******** ****-*******. *******, **** ********* ******, ********* cameras ** ********** *******, *** ********** *** **** * *** impact. ** **** ********, ** *******:

  • ********** ***** ** ****
  • *********** ***** ** ****
  • ********* / ********* *** ***** ***** ** ****
  • ***** ** **** ** ******** **** ******
  • ***** ** **** ** **** ******

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

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

*** *** **** ****** ***** ** ******* / *********** ***** of **** *** **** *** ***. **** *** ********* ** degrees (**°, ***°, ***°, ***.). **** ***** ** *** ********** coverage *****. *** ******** ** ***** ************, **** *** ** used ***************.

************, ***** *** *** ***** ***** *** **** *** **** less ******** ****. ***** *** ******** *** (****) *** ******** FoV. ***** *** ** ****** ** **** ************** *** ****** not ** ***** **** **** ** *** ** **** ******* different **********.

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

** *** **** ********* **** **** ******* **** ******* '****' like, *** ******* ****** **********. ***** ********* ***°, ***° *** **° ****:

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

*** ***** **** ** *********** * ******’* *** ** ******* (°). *** *** ****** **** ** **** ******. *** ****** the ****, *** ******** *** *** / **** *** ****** can ***. *** ********* *** *********** **** ****** *** *** FoV **** ******.

*** ****, ****** *********** ** **** ********** ******** **** ** *****. **** *** ********** **** ******, you *** ********* ******** *** **** **********.

*******, ******* **** *** ***** ** ************ ** *** **** to ********** *** ** ******* ** ***** ******* *** ******* within *** ***.

FoV ** ****

*** ** ********* ********* ** ***** *** ********** ********* ****, e.g., *** **** ** **°

*******, ******* ** *** **** ******* *** ***** **** ******** by ** *** ******. *** ********, *** *** **** ** half, *** *** **** ** ******* **. *********, ******** *** HFoV *** *** **** ********* ** ***%.

***** ******* ***° ** **° ****. ****** **** *** **** changes ** **:

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

*** **** ****** *** ******* ** *** ** ********* ******* with ********* ****. **** ** *** ******* *** ********* *** are ******* ** *** **** ******, *** ****** **** *** wider *** **** ****** ‘****’ ***** **** *** ***** ***. Likewise, ** *** **** ** ******** **** * ********* ****** look ******, **** **** ****** ** * ******** *** (*** the******* **** ** *******).

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

comp fov

** **** *** **** ** ** ****** ************. *****, ****** will ****** **** *** ********* ******* ** *** ********* ***** and *** ****** **** *** *** ** *** ******* *** the ****.

* ***** *** *** ****** **** * ******* **** ****** or * ******* ******* **** *** ******. ** *** ******* both.

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

*** ******* * ******* ** **** * ******, *** ***** the ***** ** ** **** *****. *** ****** ** ******* is ********, *** *** ***** ** **** / ****** ********* as *** ***** ******* **** *** ******.

**** ** *********** * ************ ***. *** *** *** ** physically ** *** ***** ***** ****:

fov comparison2

****'* ** ******** **** **** ************ *** **** ********* / scene:

overhead comp

******* ** ****, ***** ********* ******* **** ** **********:

  • ***** ** ** ****** *** *****. ***** ****** ***** ***** this, ** ** * ********* ********** ******* *** **** **** where ** *** *** * ****** **. ****** ****** *** "FoV ***** ** *' ** **********.
  • ** ****** *** *** *****, *** **** **** *** *******'* distance **** *** ******. ** ******** ****** ****, *** "*** FoV ******** ** * **** *** ******.'
  • **** **** *** ********** *** ******** ***** **** **** *** camera *** ***** ** *******. ** **********, **** **** ** the ****** *** *** *** **** ****** ** **** ******** delivering ********** *******. ** ********* ** *** *** ** *** wide, ****** ** * *********.

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

*** **** **** * ******* **** ****** ******** *** ***, it **** *********** *** **** *** *** ********* ** *** subject’s ******** **** *** ****** *********. ***’* ******* * *******/********* FoV **** * ***** ********* *** ** **** **** ********* in ******:

*** * *** / ******* ******, ***** * **** * subject ** ******* **** *** ******, *** *** ********* ~* feet (** *** *** ** *** ********* ** * ******). In **** ** ****, *** *** ** **** **** ** feet ****.

** ********, *** * ***** ********* ****, ***** * **** a ******* ** ******* **** *** ******, *** *** *** only ******** *** **** ** ******* ** * ****. ******* of ****, * ******* *** ** ** **** ****** ******* will **** * **** ******* *** **** * ***** ********* lens *** ****** ******* ****** ********. **** ** ***** ******** of *** ******* / *** ******.

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

  • ** **** ******* **** ******* ** ***** **** ***** ****** as *** *** **** ****** *******, ********* ******* ******* ****** their **** *****.
  • ***** ***** ********* ****** ******* * *** ***** **** ******* slowly, ******* ***** ** ***** ******* * *** ****. **** lens **** ***** ******* *** ********* **** *** ***** ** out ** *****. *** ******** ** ***** ******** *** *******.

**** *****, **** ******* **** ‘******’ ** ****** ****** (** the *** ** *** *****) **** **** ***** *** ***** ~1 **** *** ***** * **** ******** ** ******* ******** from *** ******. *******, ** *** ********, *** ********** ** FoV ********* *** **** ************ (*.*., ******* *** ***** *********).

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

****** **** **** ******* ***. *******, ** ********, *** ************, this ** ********* *** * ***** ****** ** ********* ***** imager ***** **** ** ** ******.

** ** ***** ***********, *** ****** *** ******, *** ***** the *** **** **, ********** **** ***** *****. **** ** covered **** ** *************** ****** ****** *********** *** ** ************ **** ** ********* **********.

[****: **** ******** *** ********** ********* ** **** *** *** substantially ******* ** ****]

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

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

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