Wide Dynamic Range (WDR) Guide

By Ethan Ace, Published Oct 01, 2019, 09:15am EDT

Understanding wide dynamic range (WDR) is critical to capturing high quality images in demanding conditions. However, with no real standards, any manufacturer can claim WDR, and many do even if actual performance is weak, causing confusion for even experienced users.

IPVM Image

In this tutorial, we break down these issues, explaining:

  • 2021 State of WDR
  • What is WDR?
  • Camera WDR Challenges
  • Solution: True Multi-Exposure WDR
  • Number Of Exposures Varies
  • True WDR Camera Improve Effective Details
  • How WDR Is Measured
  • Decibels Vs. WDR Ratio Measurements
  • Interpreting Manufacturer WDR Specifications
  • Resolution Vs. WDR
  • Multiple Exposures May Reduce Low Light Performance
  • Fake WDR Techniques
  • Backlight Compensation (BLC)
  • Digital WDR (DWDR)
  • Model Resolution Limitations
  • Manufacturer Terminology Confusion

2021 ***** ** ***

**** *** ** ******** increasingly ******, ****** *************** amongst **** ******* **** important:

*** ** ***** *** quite * ********* ******* found ** ***** ******, but ** ** *** closer **** **** ******. We ****** **** ***** to ********.

******* ** ****, ******** fine *********** ** *** performance ** **** ******* than **** ******, ** any ************ *** ******* their ****** ** "**** WDR" **** ** ********** of **** ***** *********** (and **** ********** **).

WDR **** ******** *******

**** ******** ****** ** cameras **** ***** ************* in ****** ****** **** ******** 2019*** ****** **** ***** on *********** ** ******** scenes.

** *** *****, ******* *****-*** ** *********** **** *******, **** strong ****** ******* *********, in **** ***** ** scenes, *****, *** ** motion, **** ******* ****** artifacts.

*** ***** ***** ***** the **** ********:

IPVM Image

*** **** ******* ** the*** ****** ******** ******.

What ** ***?

*** ****** *******************, *** ** *********** the ******* ** ******* high ******* ****** ****** a ***** ***** ** light ******. *** *******, in *** ***** *****, the ****** ** *** scene ** **** ****** due ** *** ******** behind *** ****** ** the *******, ***** *** scene ** ****** ****** of *** ******** ** it **** *** ******* direct ********.

IPVM Image

Camera *** **********

******* ************ ********* **** wide ****** ** ******** because ** ***** ********** on ******* ********. ******* **** ***** to ******** ** *****. However, *** **** ***** and *** ***** ** washed ***, *** *** little ***** *** *** image ** *** ****.

** *** **** * scene **** **** ********, the ****** *** ****** adjust *** **** ******* size ** *** ******* speed ** *** *** right ****** ** *****. This ** *** ************* typically **** ***** ******* in **** ******** ******.

*******, ** *** ***** has * **** ***** of ********, *** ****** has * ***** *********. If ** ********* *** amount ** ***** ** takes ** ** ******** for *** ****** *****, the ***** ***** ***** will ** *** ****. However, ** ** ******* the ******** ********, ********** for *** ***** *****, the ****** **** **** be ****** ***. *** image ***** ***** **** tough ********:

IPVM Image

Solution **** *****-******** ***

***** *** **** ********* for *** ****** ** setting *** ******** ************* to ******* **** **** and ****** *****, *** most ****** ****** ******** is ** *** ******** exposures *** **** ******* them ** ******* * better ******* *****, ******** to ** **** *** or *****-******** ***. *** short ******** ******** *** bright *****, ***** *** long ******** ******** *** dark *****. *** *** representation *****:

IPVM Image

** *** *******, **** WDR *********** ** *********** beyond *** ***** ******* manufacturers ******* ** ******* WDR ******* (*.*., '*******' or '**********' *** ** BLC).

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

*** ****** ** ********* used ** **** *** varies, **** * ******* of * ** * or * ** **** models. *******, * ******* number ** ********* **** not ****** **** *** camera **** ******* ****** than ***** ***** **** two *********. ***** ********** techniques, ****** *******, *** other ******* *** **** a ********** ** ****.

************, *** ***** ****** of ********* *** ******* of ***** ********** **** are ****** ********.**** ***** ********* ********* and ***** ******* ********* if *** **** *** performance ** ****** ** challenging ******.

**** *** ******* ******* Effective *******

**** *** ******* *** make * *** ********** in ****** **** ******* light ******. *** *******, in *** ***** *****, the ****** ** *** left **** *** ******* WDR *** ***** **** rough ******* ********* ** *** *******'* face ******* ****** ***. By ********, *** **** WDR ****** ** *** right ******* ***** *** subject's ****, *********, *** clothing, ** **** ** details ** *** ***** behind ***, **** ** the ***** ***** *** trees, ******* *** *** overhead *****, *** ****.

IPVM Image

How *** ** ********

** ** ******** ** know *** **** *** range ** ***** ****** a ***** ***. *** generally ******** **** ** measure **** ** ************ is *** ******* (*.*., 58dB, *****, ***.) **** higher ****** ************* ********** stronger *** ***********. *************, these ************ *** *** standardized *** *** ** the ********** ** **** manufacturer, *** ****** ** trusted.

*************, *** ************ *** based ** * ******** test ********.* *********** **** ***** (below) ** ****, ********** numerous ****** ** **** from ***** ** *****. The **** ****** * camera *** ***, *** higher *** ** ****** and ****** *** *********** performance ****** **.

IPVM Image

*************, **** **** *** translate **** ** ****-***** scenes (*.*., **** *** I ****** *** ** front **** ******?). ************, testing ** ****-********* ** each ************ *** **** parameters *** *** ** standardized, *** ******** ****** by *** *************.

An *********** ********: *** *****

** *** *******, ** developed ** *********** ****-***** approach ** ********* *** tough * *** ***** is. ***** * *** meter, ** ****** *** brightest *** *** ******* spots ** **** *****. The ***** ** *** two ******** * ****** indicator ** *** *********** the ***** **.

** * ******* ******* outdoors, **** * ***** opening ** ** ******** area, *** ***** ** typically ***** ****, *.*., 25x ** ***** *****:

IPVM Image

*** *** ***** ** this ***** ** ~***, with *** **** ******* at *,*** *** *** the ******** ****** ***** at ~***. **** ** a ****** ***** *****, but ** **** **** much ******* ** *** tests, ** ******* ********* may ** ** ****** as **,***+ ***.

******* ** ****, ** recommend ********* *** ** the ****** ***** ** be ******. **** *** be **** ** * field **** **** *~$*** *** *****. ************ ****** ** performed **** *** *** or ***** ***** ** strongest ** *** ***** as *** ***** **** vary ********** *** ***.

Interpreting ************ *** **************

*** ****** ***** ******* manufacturer ** ************** ** they *** ****-******** *** not ********* *************, **** if *** ************ ** telling *** '*****', ***** is ** *** ** know ** *** ****** is. *******, ***** *** some ******** ** ********:

  • * *** ** ****** of **** ** **** almost ****** ***** **** the ****** **** *** support **** *** ** manufacturers **** **** ****** their ******* **** *** will ****** **** *** camera ** *** ** the *** '*****'. '*******', non *** ******* ********** are ********* ** *** range ** ** - 80dB.
  • * *** ** ****** of ***+ *******, *** not ******, ***** **** the ****** ******** **** multi-exposure ***. *****, ******, since ************* *** **** to ****** *** ***** they ****, ** ** not **********. **** **** to ****** *** **** own ***** ** ****** **** *******.
  • *******, **** ************* *** relatively ************ ** ***** WDR ** *******. *** example, ***** ***** **** of ***** **** *** cameras ** '****' *****. This **** *** **** they *** ***** **** a **** ******* ************ self-assigning ***** ** *****. Actual ******* ** ******** to ******.
  • ** *** **** *** years, ** **** **** manufacturers ********** *** ** race **** ************** ** 130dB ** *** **** 150dB. *******, ** *** testing, ***** ******* **** effectively ***** *******, **** some *****-***** ****** ************* 150dB ****** ******.*** *** *** ******** for ****.

Resolution **. ***

** *** *******, ** have ***** ****** *********** between ********** *** *** performance. **** ********** ****** may ** ***** ** 1080p, ***, ***, *** even **, ** *** poorly ********** ******.

*******, *** *** ************* offer ***** ***-**** *** performance ** ***** ******* resolution ******. *** *******, Avigilon's ** **/** ******* do *** ******* **** WDR, ***** *** ****** do. ** ********, **** offers ***** **** *** "Forensic ***" ** * series ****** ** *****, 5MP, *** ** **********.

******* ** ****, ***** should *** ******** ********** a ******** ***** ** WDR ***********.

Multiple ********* *** **** *** ***** ***********

***** ******** ********* ********* restricts *** **** * shutter *** ** ***, which ********* *** ****** of ***** ******* *********'* ******, ******** *** ***** performance. ******* ** ****, most (*** *** ***) models ********* ***** *** automatically ******* *** ** night, ****** **** *** not ** *** ** do ** ** *******.

*** *******, *** ****** camera ***** ******** ******* to **** *** **** light ** *** (***** on ****** *****) ***/** when ********* ** ***** mode (*/*).

IPVM Image

**** ** ** ********* setting ** ***** ** low ***** ** * priority *** *** ******** where *** ****** ** deployed.

Fake *** ********** - **** *** ***

************* ********* ****** *** pseudo-WDR ********** ** ***** alternatives ** *****-******** ***: Backlight ************ (***) *** Digital *** (****). *******, our ***** **** ***** that ***** ********** ****** do *** ******* ** even * *** *********** true *** ******.

Backlight ************

***, ** ********* ************, simply ******* *** (******) exposure ** * ******. This ** ****** **** when *** **** ** capture **** *** ****** or **** ***** ** the ***** *** *** both. ** ***** ***, you **** **** *** portion ** *** ***** better ** *** ******* of *** ***** ***** worse.

IPVM Image

**** ***-**** **** *** models *** *********, ***** a ****** **** ****** only *** ** *** installations ** *** ***********.

"*******" ***

******* ***, **** ***** as ****, ****, ** ********** *** is *********** * ******** adjustment ** ******** ******* of *** *****, ******* of *** ******* *****. DWDR *** ** ****** in **** ****** **** doing *******, *** ***** techniques ***** ** *** compare ** **** ***.

*** *******, ** *** comparison *****, *** ********* models *** ***** **** by ****. *** **** WDR ****** ** *** left ******** ***** ******* details ** **** ** better ******* ** *** background. ** ********, *** digital *** ****** ********* washes *** *** *******'* face *** ****** ******** details ** *** **** area ** *** *****.

IPVM Image

**** **** **** ************* offer **** ******* *** in ******** ** **** WDR, *** ***** *** easily ******* *** ***, such ******' "******* *******" **. "Dynamic ********". ****** ** ***** terms *** ***** ** our*** ***** *****(**** *****).

Some ****** ********** *******

************, ***** ********, **** manufacturers' ******* ******* **** WDR, *** *** ** maximum **********. **** ** found ** **** **/**** models ***** *** ***** true *** ** ** resolution *** *** ** the **** **** ********* resolution, ** ** ******* ********** ******** * **** to **** ** ********** (2560x1440 ******* ** *********).

IPVM Image

***** *********** *** *** very ******, *** ***** should ******* ****** ************** before ******** *** ** supported ** *** ***********.

WDR ************ ***** ***** *** ****** ********

******* ************* *** ** cryptic ***** *** *******, we **** *** ******** a **** ** ************* detailing ******* **** ******* ‘true’ (*****-********) ***, ‘****’ (digital/electronic ***), ** ****. We **** ******* ***** to ********* *********, ****** conventions, ***.

*** ** ************* **** cameras **** ******* ‘****’ WDR, ***** ***** **** of **** **** **** cameras **** ******* ******* WDR.

IPVM Image

*** ******* ******* ********* this **** *** ********** manufacturer *********, ****** **** our*** ************ ***** ***** and ****** **************.

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

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

[****: **** ******** *** originally ********* ** **** but *** ************* ******* in **** ** ******* advances ** *** ************ and ***********.]

Comments (11)

**** ********** *** *** meter ****, *****’* *** meter **** ** ***** towards *** ******?

Agree
Disagree
Informative
Unhelpful
Funny: 1

***, * ******* **** frame **** ** *** mid-movement ******* ** **** it *** ******* ** the ******. **'** *** that.

Agree
Disagree
Informative
Unhelpful
Funny

**** ***** *** **** replaced.

Agree
Disagree
Informative
Unhelpful
Funny

****! (****** * ***** the ******** ***** ** out ** *****)

Agree
Disagree
Informative
Unhelpful
Funny

* ***'* **** **** you ****...

Agree
Disagree
Informative
Unhelpful
Funny

** *** ****** *** you **** ** **** the *** ~*** *** and ~**** *** **** on **** *** ***** before *********?

**** * ****** ** it ***** ***** *** posted **, * ***** have ***** ** *** different ******... * **** have **** ********, ******.

** *** *****, *** model *** ******* ****

**

**** ***, *******?

* ***** *** **** fortunate ** **** ******* image ******, **** * different *****, *** *** same ***** *** ****. ~100 *** *** ~**** light ****** :)

Agree
Disagree
Informative
Unhelpful
Funny

***** * ***** *** that *** *** *** H5SL ******* **** ******** now **** ***

Agree
Disagree
Informative: 1
Unhelpful
Funny

******, * ***** **** in *** *****.

Agree
Disagree
Informative
Unhelpful
Funny

*********** ** **** **** purchasing ** ********* '**** WDR' ** ******* ** digital *** ** **** made-up **** *** '****' WDR **********. * ****** though ** *** ** absolutely ********* ***** **** shutter *****, ***** *****, imager *** *** *** also ******* ******** ********** depending ** *** ***********.

Agree
Disagree
Informative
Unhelpful
Funny

***** **** ******* *****, frame *****, ****** *** ISO *** **** ******* lighting ********** ********* ** the ***********.

**, *** *** *** / **** ******** ******. The ********* **** *** scenes ** **** **************** **** *** ***** levels *** **** ***** levels, ** ****** ****** a ****** ******* ********* the ******* ** *** etc. ***** ***** ***** part ** *** ***** (either *** *** ** high ***** ******) ****** captured. **** **** **** sense?

Agree: 1
Disagree
Informative
Unhelpful
Funny

***, ****** *** *** feedback

Agree
Disagree
Informative
Unhelpful
Funny
Read this IPVM report for free.

This article is part of IPVM's 6,956 reports, 927 tests and is only available to members. To get a one-time preview of our work, enter your work email to access the full article.

Already a member? Login here | Join now
Loading Related Reports