Dahua Dual Imager Dome Camera Tested (HDBW4231FN-E2-M)

By Rob Kilpatrick, Published Nov 07, 2018, 10:23am EST

Dahua has introduced a dual-imager dome model, the HDBW4231FN-E2-M, with two independently positionable sensors including integrated IR, not found on competitive dual-imager cameras.

To see how this new model performs in real world scenes, we bought and tested the dual dome against Dahua's own single imager models, examining:

  • Camera positioning flexibility
  • Full light imaging performance
  • Low light color performance
  • <1 lux dark performance
  • Bandwidth comparison
  • VMS integration
  • Pricing compared to others

*******

** *** *****, *** Dahua **********-**-* **** ****** dome *** ******* *** positives:

  • **** ***********:*** ******'* **** ******* were **** ** ******** due ** ***** **** floating "*******" ******, **** support *** ******** **** to ****** ***** *** shaped *****.
  • ******** *** *****/**:*** ***** *********** *** superior ** **** **** imager ****** ** **** tested *** ** ********** IR, *** ***** ** competitors **** ** ****** or *******.
  • ***** *** ***********:*** ****** **** **** one ******* *** **** imagers ** ********, *****, Genetec, *********, *** ** Witness, ********** *** *.*** to *** ***** ******, and *.*** ** *******, Milestone, *** ** *******.

*******, ** ******** **** three *** *********, ** well:

  • **** ** ********: *** ******* ********** ** brightly *********** *** ****** of *** *****, **** objects ** *** ***** poorly ***********.
  • **** *** ***********: *** *********** *** **** against ******** ****** **** light, **** *** ********** and ******* ******** ********** washed ***.
  • *** ***** ************:*******, ** *** ***** color **** ******* ******* were ******, *** ******* objects **** ** *** test ***** **** *********** at **** ***** *** far ***** ** *** tests. **** ** **** rare/niche **** **********/** ************ but ***** ************ ******* for ***** ** ***** should ******.

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

*** ****** **********, *** Dahua **** **** ****** dome ** * ***** choice *** ***** ******* to ***** *** ****** or ****** ***** ***** may ******* ******** ****** imager ******, *** ** its **** ***********, ********** IR, *** ***** *** support, ** * ***** competitive ** *** *** cost ** *****, *** requiring **** *** ***** and *** *******.

*******

*** ***** **-***-**********-**-* ******* ****** for ~$*** ***. **** is ************* ***** **** competitive **** ****** ***** such ** *** *********-******(~$*** ******) *** ******* MicroDome *** (~$*** ******).

**** ******* ** ******* to *** ******* ** domes (********* ~$*** ****), though ******* *** *** licensing ** ******* **** using *** **** ****** camera.

Competitive *******

**** ****** ****** ******* are ***** ********** ****.*******'* ********* ***,******'* ***-******, *******'**** *********** *********. ******* *** Mobotix ******* ******* ******* not ********* ** ***** and ******, **** ** higher *********** (* *** 6 **), ** *********** audio, *** */*. *******, Dahua *** ****** ****** are **** ****** ********* and **** ******** **** brands.

Physical ********

*** ***** **********-**-* ** ******* in **** ** ****** imager *****, **** **** 5" ** ********, **** the **** ********** ***** its *** ***** ***** instead ** *** ****** one. **** *** ** seen ** *** ********** to * ******* ***** single ****** **** *** turret *****:

similar size to single imager domes

**** ****** ** ************** on * **** ***** an "*******" ***** ******. Camera ****** *** *****, with ** ********* ******* and ** ***** ******* aside **** *.*** (***° AOV) ** ***** *******. A ******** **°/*.*** ****** is ********* ** ***** regions.

***** ** ****** *** camera's ******** ********.

Open ****** *******

** ****** *** ****** in ** **** ****** area ~**' ****, **** both ******* ******* ******** of **** *****, **** the ****** ****** **** of ****** ** *** open ****** ****, ******* the *** **** *****.

**** ************* ******* **** sides ** *** **** office ****, **** **** exposure **********. *******, ***** is * ******* ***** spot ******** ***** *** camera (** *** ****** of *** ***** ****), which ***** *** **** to ***** **** * separate ****** ** *******.

Entry ****/******* *******

****, ** ****** *** camera ******** ** ***** vestibule ** **** ** a ********* *******, **** one ****** *** ** in ******** **** ****** fit *** *******. ** this *****, ******** *** even, **** *** ******* fully *******, ********* *** area ******** ***** *** camera. *** ****** ***** toward *** **** **** tightly ******* *** ***** and ***** **** ****.

Image ******* **********

******** ** * ******** 1080p ***** ****, *** dual ****** **** ******** similar ******/***** ******* ** near *****, **** **** slight ************ ** *** subjects **** ** ~* klux.

day performance comparison 10

** ***** ** ***/~**', performance *** ***** *******, but ****** ******* ************* reduced ** **** *******, with **** ***** ******* visible. ****** **** *****, detection ** ****** ********, but ************** ** *** possible.

day performance comparison 20

Dark ***** ******* (

** **** ****** **** IR **, ******* *** strong ** ***** ***** (~10'/~70 ***) ** *** dual ****** ******, *** slightly **** ** *** single ****** ****, **** better ***** ********** ** the **** ****** **** (line * **. **** 5)

dark performance comparison 10

******** *** ******** ** ~20' (~** ***), **** facial ******* *** ***** available ** *** ********** ***** they *** **** ** the ****** ****** ******.

dark performance comparison 20

Poor ** ********

** ******** ** *** HDBW4231FN *** ****, ******** illuminating *** ****** ** the ***** ***** ******* the ***** ****, *********** reducing ******* ** *** subject *** *****.

weak ir at edges of imager fovs

************, ** *** **** imager ******'* ********* ** range (***/~**'), ************ ** weak, ****** ********* ** possible. ** ********, *** single ****** ***** **** not ******* ******* ** the ******* ** **** range.

weak ir illumination at spec range

Low ***** ***** *******

*******, ** *** ***** (~2 ***) *** ****** into ***** ****, *********** was ********** ****** ** the **** ****** ******, with ******* ******** ******* in *** ****** ****** dome, ****** **** ******* overexpose **** ** *** test *****.

night color performance comparison

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

*** *** ****** ** a ********* ******* **** an ******** ****, **** lux ******* ********** *** due ** ***** ***** ~1,200 ***, **. ~** inside.

wdr test field of view

**** ******* ********* ********* in **** ********, **** facial ******* ********** ***********, though *******, ******* ******* backlight, *** ******* ******* in *** ****** **** beside *** ****.

wdr comparison

*********

********* ** *** *** Dahua **** ****** *** similar ** *** ****** imager ****** ****** *** day, *** ********** ****** at *****. ******** **** comparable ** ******'* ***-****** dual ****** ******, ****** note **** ***** ******** integrated **, ***** ****** does ***. ************ **** taken **** ******** ****** in *** *****, **** smart ****** **.

bitrate comparison

Broad *** ***********

*** ******* *** *** HDBW4231FN *** *****, **** both ******* ********** *** streaming *** *.*** ** all ***** ******. *******, H.265 ********* *** *** supported ** ******** ** Exacq. ****** *** ****** in *** ***** ****** Avigilon. *** ***** ****** used **** **** ******* license *** **** *******.

Versions ****

*** ********* ******** ******** were **** ****** *******:

  • **********: *.***.*******.**.*

*** ********** ** **** in *****.

Comments (5)

Are there separate ONVIF streams for each imager?  

Yes!

If those two lens positions were fixed, it would open the door to some cool 3D video surveillance development.

I have a demo of one of these, and I thought the same thing. They are about exactly as far apart as human eyes. They can be positioned fixed and forward. Might make nice robot eyes. Now I just need some 3d Glasses.

I know this post is a little dated. But I am trying to get motion to work with Exacq VMS. If I add it via dahua API I only get 1 stream, but I do get motion on that stream. If I add it via ONVIF I get both camera streams but unable to get motion. Is there something you guys did to get motion to work with both streams? If so could you tell me what you did when adding this to Exacq? This is not listed under Exacq Ip camera integrations. Looks like you guys were able to get this to work.

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