Avigilon Real Time Exposure And Gain

By: Derek Ward, Published on Feb 24, 2015

Knowing how exposure and gain impact image quality, bandwidth, and camera performance can useful in installation and troubleshooting.

Very few cameras readily expose this information, making it difficult or impossible to find for most users.

However, Avigilon includes this information right in the web interface of their cameras, updated in real time.

In this note, we share videos of this feature in action, showing how exposure and gain vary across WDR and adaptive IR scenes.

Real **** ******** *** **** *******

**** *** ******** *** displayed ** *** ***** section ** *** ******'* web *********, ***** *** "Image *** *******" *******. They *** ********* ** real ****, ***** **** to *** **** *** focus ********, **** **** in **** ***** *************:

Potential ****

******* ******* ******** *** gain ** ****** ** a *** ****, **** educational *** *********:

  • *** ***** ******:***** *** ********, ***** may *** ** ******** how ******** *** **** increase ******* ** *******. ***** ******** ****** bandwidth *** ***** ******* greatly, *** ************* *** they **** ** ***.
  • ** ******:******** ***** ********, ***** may *** *** ****** of ***** ** **, as ******** *** **** remain ********** *** ******** to ** ***. ************, we *** ***** ******* "adaptive **" ** ****** adjusting ********, ** ** power, ********* ** ***** remains ******** **** ******** are ***** *** *****.
  • ***:** **** ****, *** difference ** ******** **** between * ****** ******** and ******** ********* **** for *** *** ** checked. **** *** **** be **** ** **** WDR's ****** ** ******** at *****, ** ******* which ** *** **** off ***.
  • ***************:************, ******* *** ****** noisy, ***, ** ******* seemingly *** ** ******. Checking ******** *** **** may ****** ** ***************, as ****** **** *** exposure ** **** ***** may ******** * ******* or ********** *******.

***** ****** *** *** **** / *** ****** *** ******* ***** / ******** ******* *** **** *********** on ***** *** ******** and *** **** ****** ***** quality.

Feature ** ******

*****, ** ******* ****** from *** *** ** about .* *** **** IR *** ** *** how *** ****** ******** exposure *** ****. ******** ******* when ******** ****** **** ~160 ** ~*** *** (8.3-16.6ms), *** ***** **** moving **** ~*** ** ~1 *** (**.* ** 33.2ms). ** ~* ***, and *****, *** ****** is ***** *** ******* exposure, **.***. **** ********* steadily ** ****** *** lowered, **** *.* ** 28 **.

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

********* ******** **** *** On **. *** ***, we *** *** **** exposure ** ******* ** half, *** ** *** reduction **** ******** ********* (in * **** *** camera) ** * ****** exposure. **** **** **** remains ****** ******.

******** **

*******, ** **** * look ** ********'* ******** IR ******* (********* ****** smart ** *********** **). By********* ** ************** **** *****, ** can ******* ******* ** power ***** *******, *** camera ** ********* ******** and ****, ** *** of *** *****, ** avoid ************.

**** *** ******* ********** in *** ***** ** view, ** ******** ** power, ******* **** * marginal ********** ** ** power ******* ******** ** on ** ***. *******, **** is ******* **** ******** IR ** **, **.* vs. **.* **.

** **** ****** *** camera ** ** *** how ** ***** *********, and *** ****** ** exposure *** ****. ** power ** ***** **** slightly ********* **** ******** IR ** **. ***. *******, with *** ******* ****** through *** ***** ** view, ** *** *** gain ******** **** ~** dB ** **.*, **** below **** ******** ** on. **** ******** ** off, ** ********* **** less ************, **** ~** dB ** **.*, **** a * ** **********. 

******* ** ***** ******* similar, ** *** ********* here **** ********'* **** strategy *** ******** ************ in **** ***** ** more ********** **** *********.

Other *************

***, ** ***, ************* other **** ******** ***** the ****** ** ******* these ****** ********** ** real ****, ******* **** competitors (******* **** *** Mobotix) ************** *** ***** ******* in ********, ******** *** **** remain ****.

*******, ** *** **** of ******, ***** **** in *** ********!

Comments (2)

Undisclosed #1

02/25/15 07:38am

Nice work Derek!

Regarding the WDR readings:

Comparing readings with WDR On vs. WDR Off, we can see that exposure is reduced by half, due to the reduction from multiple exposures (in a true WDR camera) to a single exposure.

What does the 16.6ms shutter speed refer to in the 'WDR On' tile? The first capture of the WDR or the second or an average between the two?

In the final .1 lux tile, has the shutter reached it slowest allowed setting at 1/30 sec, and the gain its highest at 28db?

Itamar Kerbel

02/25/15 07:39am

Thank you very much Derek.
I have been using Avigilon cameras for a long time now and hadn't event noticed this.

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