WDR Tutorial 2017

Author: IPVM Team, Published on Dec 20, 2016

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.

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

  • State of WDR 2017
  • What is WDR?
  • Interpreting WDR Specifications
  • How Do You Measure WDR?
  • Camera WDR Challenges
  • WDR vs Resolution
  • True WDR Implementations
  • Fake WDR Concerns
  • Manufacturer Terminology Confusion

************* **** ******* ***** (***) ** ******** ** ********* **** quality ****** ** ********* **********. *******, **** ** **** *********, any ************ *** ***** ***, *** **** ** **** ** actual *********** ** ****, ******* ********* *** **** *********** *****.

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

  • ***** ** *** ****
  • **** ** ***?
  • ************ *** **************
  • *** ** *** ******* ***?
  • ****** *** **********
  • *** ** **********
  • **** *** ***************
  • **** *** ********
  • ************ *********** *********

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

2017 ***** ** ***

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

  • **** *** **** *** ****:**** *** *** **** * ******* *******, *** *********** ********** to "**** ***" ****** *** *** ** ***** **** ** low **** *******, **** ***********'*/*****'* *** ************' *** *** ****(*** **** ***-$*** ******). ******** ** *** $***+ *** ****** typical ** *** ****, **** ******* ** ************* ***** (*** **** *** **** *** ****** ***** $*** ** *** ****** Finder).
  • ** ****** ***:*******, *** *** *** ** ***** ** ** ****** ******, where ***** ******* *** ****** *** *********** ********** ****** ** use ** *******. **** ******* ******* ***'* **** *******, ** some ** ***** ****** *** ** ***** ******** $***.

***** *** ** ****** * "*********" ******* *** *********** ***** varies ******, ** ****** ** *** **** ***** ** ***** cost *** ******** ************ **** ******** ** *******.

Our *****

**** ******** ********** *** ******** *** ****** ** ***. *** those **** **** ** *** *** ******* *** ******** ** depth, ******* *** ****** ******** ******** *** *** ******* **** ** *************. **** *** *** recent ***** *** *** **** *** ******** ** *** ** ****** *** ****** *** *** *** ******** - ***** ** ********* *** *** **** *** **** *** ****** *** ****** ** the ********.

What ** ***?

*** ****** ******* ******* *****, *** ** *********** *** ******* ** ******* **** ******* image ****** * ***** ** ***** ******. *** *******, ** the ***** *****, *** ****** ** *** ***** ** **** bright *** ** *** ******** ****** *** ****** ********, ***** the ***** ** *** ******* *** **** ******, *** *** back **** (****** *** ******) ****** ***** ** ** **** not ******* *** ****** ********. ** **** ****** ******* *** to ******* ***** ***** ****** *****.

*** *** **** * *** ********** ** ****** **** ****** different ***** ******. ****'* *********** * ****** ******* ** * *******. *** ***-*** ****** shows **** ***** *******, *** *** ****** ***********, ***** *** true *** ****** ******* ***** *** *******'* ****, *********, *** more.

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

****** ******* ********* ******** **** **** ****** ** ******** ******* of ***** ********** ** * ****** ********. ******* **** ***** to ******** ** *****. *******, *** **** ***** *** *** image ** ****** *** *** *** ****** ***** *** *** image ** *** ****.

** *** **** * ***** **** **** ********, ** ** no *******. *** ****** **** ****** ****** *** **** ******* size ** *** ******* ***** ** *** *** ***** ****** of *****. **** ** *** ************* ********* **** ***** ******* in **** ******** ******.

*******, ** *** ***** *** * **** ***** ** ********, the ****** *** * ***** *********. ** ** ********* *** amount ** ***** ** ***** ** ** ******** *** *** bright *****, *** ***** ***** ***** **** ** *** ****. However, ** ** ******* *** ******** ********, ********** *** *** light *****, *** ****** **** **** ** ****** ***. *** image ***** ***** **** ***** ********:

 

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

Measuring ***

** ** ******** ** **** *** **** *** ***** ** light ****** * ***** ***. *** ********* ******** **** ** measure **** ** ************ ** *** ******* (*.*., ****, *****, etc.) **** ****** ****** ********** ******** *** ***********.

*************, ***** ************ *** *** ************ *** *** ** *** discretion ** **** ************, ** ****** *** ** *******. *****, manufacturers *** ***** ********* "******" ** ***, ****** ****** **** more ********* (*** ******* *****).

******************* ***** *** ****** ******* (*.*., **** **** ** **** physically?), **** *** ******** ** * ******** **** ********. * grayscale ***** ** **** **** ******** ****** **** ***** ** black. *** **** ****** * ****** *** *******/*******, *** ****** its******** *** *** ****** *** *** *********** ****** **. ***** is ** ******* ***** *********'* *** *********** **********:

greyscale wdr

*************, **** **** *** ********* **** ** **** ***** ****** (i.e., **** *** * ****** *** ** ***** **** ******?) nor ** **** ******** ********** ** ** **** ** ******** fairly ** *** *************.

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

*** ****** ***** ***** ************ ** ************** ** **** *** self-assigned *** *** ********* *************. *******, ***** *** **** ******** to ********:

  • * *** ** ****** ** **** ** **** ****** ****** means **** *** ****** **** *** ******* **** *** ** manufacturers **** **** ****** ***** ******* **** *** **** ****** that *** ****** ** *** ** *** *** '*****'. '*******', *** WDR ******* ********** *** ********* ** *** ***** ** ** - ****.
  • * *** ** ****** ** ***+ *******, *** *** ******, means **** *** ****** ******** **** *****-******** ***. *****, ******, since ************* *** **** ** ****** *** ***** **** ****, it ** *** **********. **** **** ** ****** *** **** *** ***** ** *** *** **** *******.
  • *******, **** ************* *** ********** ************ ** ***** *** ** ratings. *** *******, **** ***** **** ** ***** **** *** cameras ** '****' ****. **** **** *** **** **** *** worse **** * **** ******* ************ ****-********* ***** ** *****. Actual ******* ** ******** ** ******.
  • ** *** **** *** *****, ** **** **** ************* ********** the ** **** **** ************** ** ***** ** **** *****. However, ** *** *******, ******* **** ***** ** ************** (**** 90dB) *** *** ******* **** ** ****-***** *******.

An *********** ********

** *** *******, ** **** ********* ** *********** **** ***** approach ** ********* *** ***** * *** ***** **. ***** a *** *****, ** ****** *** ********* *** *** ******* spots ** **** *****. *** ***** ** *** *** ******** a ****** ********* ** *** *********** *** ***** **.

** * ******* ******* ********, **** * ***** ******* ** an ******** *****, *** ***** ** ********* ***** ****, ** shown *****:

wdr measured lux

*** *** ***** ** ~*.**, **** *** **** ******* ** 1300 *** *** *** ******** ****** ***** ** ~*** ***.

*** ****** *** **** ** * *** ***** ** *, the **** ****** **** *** ********** ** ******. ********, *** lower ***** *** **** ******** *** ************* *** *****.

**** **** *** ******** *** **** **** ** ******* *** this *** ** **** ** * ***** **** **** * $100-$150 *** *****. *******, ** **** **** ** ** **** when *** *** ** ********* ** *** *** ***** **** vary ********** *** *** ** *** *** *****. 

 

Resolution **. ***

** *******, ****** ********** ******** ***, *** ***** ******* ***** equal. **** ** *** *** **** *** *** **** ************* approach (*** **** *****). *******, ********** *** ****** ** ****** helps ******* ***** ******* **** ** *** ****** / ******** areas. *** ** ******* **** *** *****:

5mp vs SD vs HD

*** ***** ********* ** *** ** ******, **** ****** ** use true ***. *** *** *** *** ****** ***** ** ****** because ** ******** **** *******. *******, *** ** ****** **** true *** ******** *** ****.

**** **** *****-******** *** ** ********* ****** ********* *** ******* wide ******* ******, ** ****** ********** ********* ** *** ******* to *****'* ***. *******, *** ****** *****, * ****** ********** non-WDR ****** *** ****** ********** * ***** ********** *****.

WDR *************** - **** ** ****

***** *** **** ********* *** *** ****** ** ******* *** exposure ************* ** ******* **** **** *** ****** *****, *** most ****** ****** ******** ** ** *** ******** ********* *** then ******* **** ** ******* * ****** ******* *****. *** short ******** ******** *** ****** *****, ***** *** **** ******** captures *** **** *****. *** ************** *****:

combine xposure wdr

** *** *******, **** ** *** **** ******** ** *** top ********** *** *******.

***** ** ********* ******* *** *** ******* ***** ******** *********, this ** *** **********. *** ****** ** ********* **** *** the ***** ***** ********** ********** *********** *** **** **** * difference. *******, **** ** ***** *** ********* ********.

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

* ****** ******** ** *****-******** *** *************** ** ***** *********** in *** *****. ***** ******** ********* ********* ********* *** **** a ******* *** ** ***. *******, **** ** ** ****,****** ************* ** **** *****, ********* * ******** ***** (****** ** too *** *** *** ******* ****** ****).

**** ***** *** *******, **** **** **** *** ** ******** at ***** *** ******* *** ***** ***********. **** ******* ** this *************, ****** ***** *** ****** ************* *** * *** have ** ******. **** ** ** ********* ******* ** ***** if *** ***** ** * ******** *** *** ******** ********. 

Fake *** **********

*** ***** ******-*** ********** **** ***** **** ******* ** ************* ** being ************ ** *****-******** ***. *******, *** ***** **** ***** **** these ********** ****** ** *** ******* ** **** * *** performance **** *** ******:

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

***, ** ********* ************, ****** ******* *** (******) ******** ** a ******. **** ** ****** **** **** *** **** ** capture **** *** ****** ** **** ***** ** *** ***** but *** ****. ** ***** ***, *** **** **** *** portion ** *** ***** ****** ** *** ******* ** *** other ***** *****.

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

******* ***, **** ***** ** ****, ****, ** ********** *** ** *********** * ******** ********** ** multiple ******* ** *** *****, ******* ** *** ******* *****. DWDR *** ** ****** ** **** ****** **** ***** *******, but ***** ********** ***** ** *** ******* ** **** ***.

**** **** **** ************* ***** **** ******* *** ** ******** to **** ***, *** ***** *** ****** ******* *** ***, such ******' "******* *******" **. "******* ********". ****** ** ***** ***** *** ***** ** *** *** ***** ***** (**** *****).

Same ************ - *** ** *** ***

**** * ************* ****** '****' ***, **** ******* ********* ****** substantially ****** *********** ** ***** ******** ********** **** *** *** WDR *******. ** *** ***** ****, ** ** ***** ***** a *** ******* ******* **** **** *** *** *** *******.

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

axis wdr vs non

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

sony wdr vs non

****: ** *** ******* *** **** *** **** ** ***** shots *** **** ********* *****/***** *** **** **** ******** **** up ** **** ******. ***** ****** *** ******** **** ** examples ** ***** *********** ****.

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

******* ************* *** ** ******* ***** *** *******, ** **** put ******** * **** ** ************* ********* ******* **** ******* ‘true’ (*****-********) ***, ‘****’ (*******/********** ***), ** ****.  ** **** provide ***** ** ********* *********, ****** ***********, ***.

*** ** ************* **** ******* **** ******* ‘****’ ***, ***** about **** ** **** **** **** ******* **** ******* ******* WDR.

*** ******* ******* ********* **** **** *** ********** ************ *********, please **** ****** ************ ***** ***** *** ****** ******** ******. 

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

** **** **** ******** *** ******** ***** ******* *** **** WDR *** **** ***** **** ** *** ****** ****** (***** *******, ****** *** = ***).

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

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

**** **** * ******** **** ***

[****: **** ******** *** ********** ********* ** **** *** *** revised ** ******** **** ** ****** ******** ** *** ************.]

Comments (3)

*********** ******* *** ***'* ***** **** ** **** ***** ***** standard ******* ******* *** ********** ********* **************. ******* **** * manufacturer's ***********, ***** ****** ** ********* *** *********** *** ********* to ***** *** ******* ***** *** ****** ********* ********** *** bench *********** ** *** ******(*) **** *** **********. ***** ** an ******** ******** *** **** ****** ***** **** *********, ********* mine **** *******.

****-********** ********** ******** (****) ******** ********* ** *** ***** **** 5.

*** ********** **** ** **** **** * ****** *** ********* participate *** *** *** ******* ********* ** ****** *** "****" benchmark *****, ********* *** ***** ****** ****** *********** ***** ** the ********** ***** ** ****** ************* *** *** "***********" ***** for ***** ********. ** * ******** *** ***** ** ** truthful *** ** *** **** **** ***********, ******* * ******* can ** ******. ** **** ***** **** ********* **** ***** get ** ** **** **********.

**** ******* *****
(***) **** - *** ** ***
******** ***** *** ***** **** * - *** ** ***

**** * **** ********** ******* *** * ************ *** **** difference ***** ***** ******** **** ************* ** ***** ******* ****. Providing ** ****** ****** ***** ** *** ******** ***** ** be *** ****** ********* **** **** *** *** *** ** include **** ***** ** **** ** *** **** ** *** industry ** ***** *** ********.

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

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

********.

*** *** ******* **** *** ** ******* **** *** **** "W" ** *** ***** **** **** *** *** *** *** newer ****** ** ****** *** ** **** **** *** (***,***,***). They *** ****** **** * *(******* ***** *** **** *** and ***** *********). *** *** ******** ***** ********* *** ** only ****** **** ** *.

******, **'** ******* **** ***** **** *** "*" ***** ****.

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