Testing Bandwidth vs Low Light

Author: Ethan Ace, Published on Nov 07, 2014

Bandwidth and low light can be a bad combination.

Despite many assuming / calculating bandwidth as a single 24/7 number, bandwidth can vary dramatically.

One of the big drivers of bandwidth changes is low light / night time.

But how big?

100% more than day, 500% more, 1000% more?

We tested 8 manufacturer's cameras - Arecont, Avigilon, Axis, Bosch, Dahua, Samsung and Sony - to find out how each did, what was average, and who was worst and best.

********* *** *** ***** *** ** * *** ***********.

******* **** ******** / *********** ********* ** * ****** **/* number, ********* *** **** ************.

*** ** *** *** ******* ** ********* ******* ** *** light / ***** ****.

*** *** ***?

***% **** **** ***, ***% ****, ****% ****?

** ****** * ************'* ******* - *******, ********, ****, *****,*****, ******* *** **** - ** **** *** *** **** did, **** *** *******, *** *** *** ***** *** ****.

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

498% ******** *******

****** ***** ** *******, *** ******* (****) ********* ******** **** day ** ***** *** ** ********** ***%. *** ****** *** 'just' ***%, *** **** ****** ** ** * *** ******* with **** ***% ******.

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

*** **** ** ** ******** **** ***** ** ***** ***** time ******:

Issue - ******** *****

*** ****** ** ***** ****** ** *** ******* ****** *****, aka ******, *** *******, *** **** **** ** ********* *********** **** *******.

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

*** ** ** *******, **** *****, **** *** **** ******** (black *** ***** **** **** *****) *** ***** ********* (******* around), **** ** ****** ** ******. ******,********* ******* *** ****** / ***** **** *** ******* *** stationary. ***** ********** **** ** *****.

Use *** **** * ***

***** *** *** **** ** ******* ***** ****** - *** CBR ** *** **** * ***. 

** ******** ********* *** **** * *** ******* ** ***** you *** **** ***** ********** ** *** *** **** **** more ******* **** ****** *** ****** (*.*., *** ****, *** motion).

*** ****** ** *** ******** ****.

Getting ****** - ***

*******, ****** *** ******* ******. *** **** ********* ** ****** this ** ****** ***, ** ******* ***** *********, ***** **** to ******* ***** ******* *** ****** ********* ****** **** ******* noise. *** *** ****** *** (******* ***** *********) ***** *** **** ****.

Using ** ************

**, ***** ** ** ***** **** (****) ******* *** "***", reduces *** **** *** ***** ****** ****** ** **** *******. With ***** ****, ***** ** **** *****, *** **** **** noise, **** ********* ******* **** ** *******.

** ****** **** ********** ** ******* ** **** ***** *******. Results ****** **** ****** ** ******** ** *** ******** ** bullet ****** ** **** ***% ** *** **** *****-*, **** an ******* ******* ** ***%, *** ***** **** *** ****** 500% ********* **** ** *** ***/***** ******* *****. 

*******

** ****** ** ******* **** ***** ************* ** * ****** daytime *** ** ~* *** *****, ********* *********. *** ******* compression ****** **************** *~**. **** *** *** ******** ****** ******:

  • ******* ****** **********
  • ******** *.*-**-**
  • ******** *.*-***-***
  • **** *****-*
  • **** *****
  • ***** ***-****
  • ***** ***-****
  • ***** ***-*******
  • ***** ***-********
  • ********* **-*******-*
  • ********* **-*********
  • ******* ***-****
  • ******* ***-****
  • **** ***-******
  • **** ***-*****

Comments (9)

*****,

*** ***** ******* **** *'** **** ****** *** *****: ***** AGC *** ** ********* ** ****** ****** ****** ** *** light, ** *** ******* ********* - ****** ** *** **** of ********* ************ *** *****.

*** ***** **** ** *** **** ********* *** ** **** it ***** "*******" *** ******, ********** ** ******** ******* ** darker ******. *** **** ******, ** *** ** ****** ***** it ********** ** ******* ** *** ** ******** *** ****** by ******** *** ***** ************* ****** ****** *****.

* ******** ******* **** ************* **** ** *** *** *** much ** ******* ***** *******' *** ***** ************. *'** ***** found **** ******** *** ** **** ** **** ** * good **********. *** ***** *** ** ******** **** ** *** light ***** ** **** *** *** **** ** *** *****, muddiness *** ********* *** ***** *********.

******** **** ****** ** * *** **** ** *** ***** (especially *** * *** ***** ** * ******* ********* ** outdoor ** ** ***** ****** ************).

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

**. *** *** *** *** **** **** ** **** ********** low ***** ******, *** *-** ***? *** *** ** ** higher-contrast **********, ***** ***** ** *** *** *** **** *** the ******** ** ***** *****. **** ***** ** **** ** line **** **** * ***** *** ****.

*********, *****-*** ***** ****** *** * ********* *********, *** *** fact *******: *** *** ***** ** **** ******** ** ** solves. *********, **** ***** ** *** ********* *** *** **** in *******. **'* **** **** ** ******* ***, ********** ** my ***********.

***** *** *** ********** ***** **** *-** *** ******.

****'* * ********** ********* ********* ***** *** **** ** / 20 / *** *** ****** ** ***** ** * **** night / **** ********. ** **** *****, ******* ** ****** gain ****** ** * ******** ********** *****.

*******, ** *** * ***, *** ******** *** **** ***** than ********, ****** ******* ******* **, ***'* **** ** ***** at ***.

*** "* ******** ********** *****" - * ********* ** *** image ** ** ** ******.

*'** **** ** **** ******* *** ***'* ********** *** ************* of ***. *'** **** ***** ***** ***** ****** ****** *** somewhat-to-largely ****** **** *** ********** ** **********.

**!

*****,

********* *******. * **** **** **** *** ****** **** **** as **** ** ****** ******* ** **** *** *** ******, with *** ** **** ********* ** ** *** ***** ****. That ****** **** ***** **** ** ******** ** *** ***********. I've ***** **** ** *******, ************* **** ** *** ******-****-********* AGC ****** **** *** ** *** ** "****".

** ****: *** *********** *** *** ******* ************, ***** *********** image ******* ** ******** *** ***** ** ********** *** **** well *** *****.

*****,

*********** *** ********* *** **** *** ** ******* '***** **********' in **** ** **** ******* *************** ** **** *** ******* any ********** **** *** **** ******, ******* ** *** *** should ******* *** ******** ** *** *****, ** ** ****** responds ** ****** ** ********** *********** ************* *****. ***-****-*** *************** **** ******* ********* '***** **********', **** to **** ****** ** ***** *** **** ****, ***** ** the **** ** ******* ****** **** * ***** ****, *** lose *** ****.

*** **** ******* ** ***-****-*** ** ******** ******* ***********. ** has ******* ******* ** ******* *****/******** ** *** ******* ********* network **** ****** ** ********* **** **** *** ******* **** peaks *****, ***** ***** ******/**** ****. *** **** ** **** applications ** ***** ********* ** ****** ********** (**-**, ****, *** links) *** **** *** ** **** ****** ** *** *** happy **** ****** ******** ***** ** *********** ****** ** *********** activity ** *** *****, ************* ** ** ***** *** **** when *** **** ***** ***** *** ********.

** *** **** * ********* ******* *** **** ******* *** you **** ** ** **** *** **** *** ** *****? In ****** ******** *** **% ******** ********, *** **** ******* room *** *** *** ***** ** ************* ****** ******** ***** at ***** *** ****** ***** ******* ** *******. **** ** true **** * **** *** *******, *** **** **** *** encoders ******* ** **-****** (********* ** ******* *******, *** ***** yourself ** *-* ******* ** *** ******* ** ***** **** loss. **** ***-****-*** ***** *** ** *****, ***** *** ***** are *** ********* *** ***** ***** **** **** ******* *** be *********, *** *** ** *** **** *** ****? *** many ***** *** ***? * - * *******? **** ** not * *** ****** ** * ***** ****** *** ** the ****** ****** ** ** * *** ******* *******, ** quickly ******* * ******* ******** *****, *** **** ** *** camera ** *** **** *** **** *** ********** ****.

** ***** ******, *** ******** ******* **** ***** ***********, * think ***-****-*** ** ***-********** *** ***** ***** ** * ****-***, but ** *** *** ***********.

*, ***** *** * ****** ** ****** ** **** *************** / ********.

*****,

"**** **** *** ******** ******* ** **-******"

****'* *** *******, ******** *** *** ***** *.***, ***** **** everyone ****, *** * ******* / ******* *********** *****, ***** almost ******** ****. **** ** ***** / *****, *** ******** will ****** ****** ** **/*, **** ** **** ********** / traffic ******. **'** ****** **** ** ******** *********.

"[*** **** * ***]** ****** ******** ** ****** ** ********** *********** ************* *****"

** *** ************ *** **** * *** ************ *** *** light / **** ***** *********. ***** *** ***** / **** noise ********* *** ***** (** ** **** ** ** ** dark / *****), ** **** *** ***** '*****' *** *****.

*** **** ********* ******* ** *** **** * *** ** low ***** / **** ***** ********* ** **** *** ********* quantization / ****** *********** ****** **** ***** ** *** ****** in ******* ******* ** ***** ******.

** ** ***** **** *** **** *** **** * *** on * ********* '*******' ****** ** *** ***** / **** noise **** ******** *** ************ ***** ****. *******, **** **** not ***** ******* ***** ******* ** ********. ** **** **** such ***** ** ******* *******. **** **** ** ** **** yourself *** ****** **** **** ********.

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