Testing Polarizing Filters on HD Cameras

Author: Ethan Ace, Published on May 30, 2014

Sun glare is particularly challenging for surveillance cameras. Even top cameras struggle with such conditions.

One technique suggested is using polarizing filters. Simply put, these filters pass certain polarizations of light, while blocking others, reducing sun glare at specific angles. 

To test how polarizers worked in real world scenarios, we tested 720p cameras in three configurations:

  • Auto-iris lens with polarizing filter
  • Auto-iris lens, no filter
  • P-iris lens, no filter

We tested these three cameras outdoors on a bright, sunny day, to see how the polarizing filter impacts performance.

*** ***** ** ************ *********** *** ************ *******. **** *** cameras ******** **** **** **********.

*** ********* ********* ** ***** ********** *******. ****** ***, ***** ******* **** ******* ************* ** *****, while ******** ******, ******** *** ***** ** ******** ******. 

** **** *** ********** ****** ** **** ***** *********, ** tested **** ******* ** ***** **************:

  • ****-**** **** **** ********** ******
  • ****-**** ****, ** ******
  • *-**** ****, ** ******

** ****** ***** ***** ******* ******** ** * ******, ***** day, ** *** *** *** ********** ****** ******* ***********.

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

Key ********

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

  • ******** ******* ********** ******* *** ****** *** ***** ************* ******** to ********** *-**** *** ** **** **** ******, **** *** ability ** *** ******** ******* ***** ********* ******** ** ***** and **********.
  • ***** ******* ** ***** ** ********* ****** ****** ************* *** to *** ****** ************* ****** ** *** ******.
  • *** ***** *********** *** ********** ******** **** *** ****** **, with ****** ********* ******.
  • *-**** ****** ******* * ******** *********** ** ********** **** ******** DC **** **** ******, *** ***** *** ********** ** ***** a *********** *****.

*************** 

********** ******* *** ********** **** ** ****** ** ********* *** glare ** ******* ******. *******, ****** ********* *** ***** ** incidence **** ** ** ********* ********** ** **** *** ** be ****, ** ************ **** **** ****** ***** **** ****** angles, *** *** ****** *****. ******* ****** ** ****** **** this ** *************, ** ********* ***** ********** ****** *** **** likely ** ***** ** ******* *** ************* ** *** ******.

Filter ******** *****

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

**** ****: **** **** ** ***** ******** ** *** ***** ** * standard **** *** * **** ******* **** *** ******. **** ring ****** *** ******* *** ********* ** 
******** ***** ** ********** ********* ******. ***** *** ****** ** mounted ** *** ***** ** *** **** *** ** *********** a **** ***** ** *****, ***** ** *** **** ******* nearly unchanged. Pricing varies **** ***** $** ** $** *** *** ***** ****** ** ** ***** ******, *** *** *** over $*** *** ****** ******* **** ** ***********.

*-*****: *-***** ******* *** ** ******* ******* *** **** *** ****** with * ******** **** ***** ** ** ***** *** ******. **** allows *** **** ********** ******* **** **** ****** ** *** ****** being ****** ** ******* ** ************. *******, ***** ***** ******** add ******** ******* *** **** *** ******, ***** ** ********. C-Mount ******** **** *** ***** $***+ ******, *** ********* *** ******, ********* ******* $**-***, ****** *** a **** ********* ******* *******.

Filter *****

** **** * **** **** ****** **** ******* ******* ******* in **** ****. ** **** ***** ** **** *** *** filter ** *********, **** * ******** **** ******* ** *** lens:

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

** **** ***** ** **** *** ** ******** ***** *** filter *** ***** *********, *** **** ***** ******. ** **** example, ** *** **** ** ****** ***** ** ****** *** windshield ** **** ******* ** *** ***, *** *** ****. Because ** ****, ***** **** ******** ******* ****** ** ********* considered *** **** *************.

Vehicle *****

*********** *** ******* ** **** *** *****-***** ** *** *******, *** windshield ** *** *** ******** ******** *** *** ** *** *** left ******, **** *** *** ****** ********* ****** *** **** of *** *****. *** ****** **** *** ********* ****** *** *** *** subjects **** ****, ***** *****, *** ****** ************** *** ***** *** ******* **** *** *** ***** ** the *** *** ********** ** *** *** *** *** **********.

****, ** ***** ** * ******* **** ** *** ***, **** significant ********** *****. ***** *** ********** ******, ********** ***** ** nearly ********** *** ** *** ******* *** *** ******* ** the ***. *** ********** *******, **** ******** *** *-****, *** unable ** *** ***, ****** *** *-**** **** ** ********** better. 

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

** ****** *** ********** ****** ** ***** ** *** **** impact, ** ***, ** *** ** *** ***** ***********. ** a *** ***** *****, ***** * ***, *** ***** ** noticeably ****** **** *** ****** ********, **** ** **** ******** shot **** *** ******* ** *** ***:

*******, ********* *********** *** *****, **** ** *** ***** *****. ***** the ***** ** ******** ******, ** ** ** **** ******* with *** ********** ****** **, *** ******* ** *** ******* are *******.

Test ***********

*** ******* **** ****** ***** */*** *** ******* ** ** *** with ************ ~** *******. *** ***** ******** **** **** *******.

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

  • ********* ****: ***** ***-****, ******** *.**
  • ******** ****: ***** ***-****, ******** *.**
  • *-**** ****: ******* ***-****, ******** *.*********

Comments (13)

** ** *** ***** ** ** **** ***** ** *** effect **** *** ******* ** ****. ** *** ***** *** polarizing ****** ** *** ******* ** ********* ***** **** * scene **** *** ***** ** ********* ** *** ***** ***** be *** *, **** ***** ** *** ****** ** *** late *********, **** *** ***** ** ********* ***** ** *** B ***** *** ** ** **** ** ** ***. ********* from *. * ******* **** *** ********** ****** ***** **** to ** **-********. **** ***** ******* ***** *** ********* ** the ****** ** ********* ************ **** ************.

...** ************ ********* ***** **** * ***** **** *** ***** ** incidence ** *** ***** ***** ** *** *, **** ***** be *** ****** ** ***late *********...

********, **** ** *** *** ***** * ****** **** ***** compensation, *** *** **** **** *** ****** ******** ** ****** glare. **** *** **** **** ****** ***********sensor ******** (AKA blooming), that WDR can't even fix it.

* ***'* ***** **** *** *** **** ** **** **** scenarios *****you **** ******* ******* ***** *** ******* **** ********* glare in the same static FOV, but typically its one ** *** ***** and then only for maybe a couple of hours once a day... What have you seen?

***,** *** ********* ** **** *********, **** ***** *** ****** *** ** ****** **** ** out ****, ** ***** ** ***** *** ******* ****** ***** around ** ***** *** ******* ********* *** ** ***** **** **..(** ** ** ***, *'** ***** ******* ******* ******* ***** can ** **** ** * ***** **** :)

"* ******* **** *** ********** ****** ***** **** ** ** re-adjusted."

******, **** ********.

* ***** *** ***** ***** **** ***** ** ** *****, even ** *** *** **** ********** ** *** ******* **** just ********* ***, *.*., ** **** *** ******** ** *** setting *** ****** *** ****** ********** *** ****. *****'* **** / ************** ***** ****.

*** *******, **** ** **** ** ** ** ******* **** for ***:

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

* ** *** ******** *** **** ***** ****** **, *** it's, ** **********, *** ***** ** **** ****, *** ************* if *** ***** ** ****** ** *** ***'* ***** ******* significantly, ** ***** **** ** ********* *** ***** ********* ** the *** ********* ******.

**** ** ** ***** * ****'* ****** ****** ******'* ** right, * **** ******'* ***** ** * ******* ********* ***** he ***** **... ** *** **** ** ****? ***** * lake ***** ***** *** *** ** ********, **** ** ***** across *** ***?

**** *** ********** ****** ***one ** ***** ******* ** **** *** ********, talk about glare! It would have to do something, right?

*** **** ** ********* *** ***********. **** ** ******* **** likely ********. **** ********* ** ****-**** *** ** **** ****** north-south ** * ******* *** *** *** ****** ********* ** the ****** ******* ** *** *** ***** ** *** ***** or *****. ** *** *** ****** ********, *** *********** ** the **** ***** ******* *** ******** **** *** ****** **** different ****** ********** *** ***.

** *** *** ****** ********, *** *********** ** *** **** would ******* *** ******** **** *** ****** **** ********* ****** throughout *** ***.

*****,I ***** ** ******, but I am not sure this disparity in angles would be enough to cause any concern, and even if it did somtimes occur, I don't think it would occur enough to

...************ *** ********* ** *** ****** ** ********* ************ **** applications. (**)

***** ** * ****** ****** ***** ******* *** *******, ***'* you *****?

**** *** *** *********** *'* *****, *** ** **** ** you ******:

*. ****** ** * ***** *** **** **** ************** ******/*******, with * ********** **** ***** ** **** < **.

*. ****** *** * **** ***** ** < *

*. *****, ** **** ***** ***** ******** ***** ***** ****** excessive ***** *********** *** ****** ****-******** (** **** '**** *** cameras ********')

********* ** **** ******* ** * ****** ******* *****-*****, *** difficulty **** ** *** **** **** *** *** ****** ** always **** **** ** ******* *** ****, ********* *** ***** amount ** ********* ***** ******, ******** *** ***** ** *** light ** ********, ***** ******* ** ****** ** ******* * filter. ***, ** *** **** ***** *** ****** ** *** east ** **** ****, *** ***** **** ** ****** ******** to *** ***** ** ******* * ******, *** **** ** that *********...

*****, ***, ******* *** **** **** *** ****** ** ******** off **** ** *** ***, *.*. ******* *** *******, *** you ***'* **** * ****** ******* ** **** ** *** sametime ******* * **** ***** **** (** * ****** ******** mirror ** *** *******, *** ***** *****?).

*****'* * *** ** **** ****** ********** ******* *** *****, so *** **** * ****** ** **** ****** ******** ***** a **********, **** ******* *******. *** *** ******* *** ******** effective ** **** *****, ***/**?

* **** ******* ****** * ***** *** ** ******* ** a ***** ***** ***** ********** **, ** *** *** **** gone *******. ** ** *** ** *******, ****** ******/****** **** and ****** ** ********* *** *** *************.

*** *****:

* ****** **** ***** ***********, *** ****** ****, **** ** us *** ****** *********** ** ** *** ****** ******. ** would ********* *** ** ** ** ***** ** **** ***** IPVM ****** ***** **** ** ******** ***** ** ****** *****.

** ****** *** ******* **** *** ********* ***** ** "*******" limited ** ***** ** *** ********** **** ** **** ************ is ******** *********** *** ******* ***** * *** *** ******* days, **** **** ************ ****** ** ****** **** *** ** alternate ******** ***** ** ** *****.

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

****'* *** **** ****,** ***'* **** ** *******' *******!

*** ***? ******* * **** ******* ** *** **** ***** scene,********** ** *** ****** ***********, ***** ******** ***** ** *** '*******' *** **** ***** in *** '**** *********' ***** **** **** ** '******* *******', ********** ** ******* * ****** ** **** ** ***...

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*** ** ** ***'* **** ** ** ****** ******-**** ***** test *********** *******,**** **** ****** ** *** ***** ** ******** *******? ****** ** ***'* **** **** *** ** **** * scene **** ******** *** ***** **** **** * ***, ** we?

*.*. * ******* ***** *** ****** *****-***** ****-**** ***** **** only *** **** *** * *** * **** **** ******* any ***** **** *** ****** ******** ** ******* *** **** from *** ***. * ***** * ***** **** ***** * lot ****** ** * ******* ** *** ****** ** *** double ***** ** *** ***** *****, *** ** * ** guilty ** *** ****** ************ ****. *** ***** ** * lot ******, ********* ** **** *********...(*********?)

*** **** *** ****** ** *****, *** **** ** *** impact ** *** ***** ****** *** *** **** ***** ***'* a ********* **** ******** *** ******?

***** *** *** *** **** ********* ******?

***, * *** **** ******** ***** **** **** **** ******* replied ** **.******, ****. * *** **** ** *** **** first **** **** ** ********** ********* ** **** ***** ***** inside * *** ** ** ****** **. * **** *** I ***** *** *** *** ***** ******* ** *** *****. She ***** *** **** ******* *** *** ******* ********* ****** sunglasses. ****** ****.

**** ****** **** *********** ** ***** ****-**** ****** **** **** fit ******* ** ****** ****** *** ** *********?

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