Digital Noise Reduction (DNR) Guide

By Ethan Ace and Ilya Ignatenko, Published Jan 07, 2022, 08:38am EST (Info+)

Visual noise spikes camera bandwidth usage in low-light. Digital noise reduction (DNR) aims not only to reduce noise but to improve video quality and minimize bandwidth usage.

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In this 10-page guide, we explain the effects of digital noise reduction on image quality and bandwidth consumption, as well as noise reduction methods used in video surveillance, examining:

  • Digital Noise Reduction Basics
  • DNR Methods
  • Spatial Digital Noise Reduction
  • Temporal Digital Noise Reduction
  • 2D vs. 3D Noise Reduction
  • Manufacturer DNR Controls
  • DNR Image Quality Improvements
  • DNR Motion Blur Issues
  • Camera Model DNR Motion Blur Performance
  • Motion Blur Vs. Noise Tradeoff
  • DNR Bitrate Reductions
  • Smart Codec Impact On DNR

Key ******

***** *** **** *** ********* **** this *****:

  • ***** *** *** *** ******* ** digital ***** ********* (***), ******* (****** frame) *** ******** (*****-*****), *** **** are ***** ******** *** ******** ** as "** ***."
  • *** *** ******* ***** ******* *** lower ********* ** ****** ******** **** efficient, *** ******** *** **** *** cause ****** **** ** ****** ******.
  • ***** ** **** *******, **** *******' default ******** ***** *** **** *****-*** of *****, ***** *******, *********, *** motion ****, *** **** ** ******* in **** ******* ****** (******** *** ***** **** *********** **** *******).
  • ******** ******** *** ******** ** *** overall **** ****** ****, *** *** increased ***** ***** ******* *** ***** quality ***** ** ****** *******.
  • ** *** *****, *** (** ******* settings) ******* ********* ** **-**% ** night ******** ** ********* ** ** setting ** ** ******* ******.

** ****** *** ****** ** *** and **** ** ***** ******* ** detail *****.

Digital ***** ********* (***) ******

** ***** ****** ********, ******* ******* to **************** ******** *** ********** ** images ************** **** *******.

*******, ***** *** * ********* **** effects:

  • ******* ***** ** *** ***** **** obscures **** ******* (***** ** ***** better **** *** *********** ******* **** - * ********** **** *****)
  • ******** ********* *********** ******* *** ******* sees *** ******* ***** ** ****** objects **** *** **** ********* ** encode.

******* ***** *********, ** *** **** states, **** ** ****** ******* ***** present ** ***-***** ************ ******. *** example, ** *** ***** *****, *** subject ** *** **** ** ***** with *** ********. ***** ******** *** face *** **** ** *** **** chart, ***** *** ****** ** ****. However, **** *** *******, *** **** can ** **********, ******** ******* *** be ****, *** ******* ***** ** the ***** ****.

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Methods ** ***** *********

*** *** *********** ***** ** *** are ********* ******** ** ** ******* and ********. **** ***** ** ***** as "**" *** "**."

Spatial ***** *********

******* ***** ********* ******** ******* ** adjacent ****** ** *** **** ***** to ********* **** ** ***** *** averages ***** ****** ** ****** *** image. **** ********* *** ****** *** sharpness ** *** ***** ** **** levels, *** ** ******** **** ************* power *** ******** ***** ******* **** temporal **********. *******, ******** *** ********* offers ****** ***** ********* ** ***-****** images **** *******.

Temporal ***** *********

******** *** ******* ******* *** **** pixels ******* ****** ** **** *** pixels **** ** *** ****** ************ from ***** ** *****. ****** ** those ****** *** **** ******** ** smooth *** *****.

*******, **** ****** *** ****** ** noise *** ******* ******** ********** ******* of *** ***** ****** ** ***** values **** ***** ** *****. ******* of ****, ******** ***** ********* ***** causes ****** **** *** *********, ********* later ** **** ******.

3D ***** *********

******, ** ********** ******* *** ******* and ******** ******* ********* * ******* image **** **** ****** ****, *** are **** ******** **** ** ***** surveillance. ****** ** ***** ******* *** bitrates **** ** *** ****** **** manufacturer ** ************ *** ******* ** the *********** ** **** **********.

**** **** *** ***** ** *** temporal *** *** ***** **** *************** in ***** ************ **** ****** ** is *** *********** *******. ********, ******* DNR ** ***** ****** ** ***, though ** *** *** *** ****** spatial ** ******** ***** ********* **********.

Manufacturer *** ********

**** ************* ** **** *** * combination ** ******* *** ******** **********, though ******* ** **** ** ****** presented ** *****. **** *****, *** is ****** ********** *** "**/***" ***/** a ***** ******, **** ** *** Hikvision ***** *****. ***** ** ** clear ********** ** ******* *******, ********, or **** ******* *** ***** ******** here:

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*******, **** ************* ***** ******** ******* of ******* *** ******** *** ***** allows ***** **** ******* **** ******** for ***** ******** ******, **** ** in **** ***** ******:

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***, ******, **** ***** *** ********** of **** ******** *********, ***** ** is **** ****** ** ******* ******** image ******* *******, **** ** *** Avigilon ****** ***** *****:

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DNR **** ******

***** *** ****** ***** ********** ** many *****, **** ****** *** ********* blur ** ****** ******* ****** ********** ***** *********, ***** ****:

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DNR **** ** ****** *** *******

** *** *******, ****** *** ******* suffer **** ****** **** ** *** light ******, *** *** ******** *** light ****** ***** ******** ******** ******. Shown ** ******** *** ***** ********, **** *** "****" ********** **** Q1798-LE ******** ****** **** ** ~* lux, ***** ******* *** "*****" ********** produced ************ **** ******** ****** *** reduced *******.

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***** ****** ******** ** ******** ***** levels (*.*. * *** *****), *** were ******* ** **** *******.

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*** ******** *** ***** **** ******** ******* **** ******* *** ******** ** these *** ***** ******.

Reducing ****** **** ********* *****

***** ****** *** ******* ******* **** blur **** ******** ***** ********* ** used, ******** *** ** ******** ******** specifically ** ****** ****** **** ********* results ** ** ******** ** ******* noise ***** *********** ******** ******* *******.

*** *******, ** *** ****, *****, the *******'* **** *** **** *** blurred ** ******** ********* ****** ** temporal ***** *********, ********* ******* *******. With ******** ***** ********* ****** ****, right, ******** ******* ******** *******, *** his **** ******* ******** ** ******* noise, **** ************ ******* ***********.

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******* ** ****, ***** ** ********* that ***** ******* ** ****** ******** noise ********* ** ****** *** **** in ******** ******, ** ** ****** that ******* **** ******* **** ********, if ** ***.

Intelligent ***

**** ******* *** ******* "***********" ***, which ******** ********* ** ***** ****** (discussed *****), ********** *** ** ****** areas ** *** *****, ***** ******** it ** ****** ******* ** ****** motion ****.

*** *******, ** *** ***** *****, the ****** ************* ******* *** ****** on *** ******* ****** ******* *** scene. **** ****** ********* ****** **** caused ** **** *** ****** *** adds **** ******* *****, **** ****** the *******.

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*********** *** ** ** ******** *******, but **********, **** ***** ************ ******** **** *********.

DNR ******* **********

******* ******* **** *** ************* **** smart ****** *******, ** ***** **** DNR ******* ******** ** ** ******* of ~**% ** * ~*.* *** scene. **** *******' ******** ********* ** 70-90%, **** *** ******* ********** ** ~25%.

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**** *** ******** ** * ******** of ***** ****** ** **** ******* tested, ** **** *** ******* ***** bandwidth **** ***** ****** *** ********. For *******, ******* * *** * produced *********** *** **** ******* **** DNR ** ** *** **** ***** codecs **** ********, ***** ****.

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************* ** *** ************ ******* ******* DNR ****** ** ***** ***** ** their *************, ** **** ******* ** place ** ******** ** ********* ****.

Comments (1)

* ***** *** ***** **** ** issue ** *** *** **** ******.

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

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** *** **** ** *** ***** you *** **** **** *** **** camera *** * **** ****** ******* speed **** ** **** ******* ***** a ***, ******* *** ***** *** a ***** ***** ** *** **** (because ** ** ********** ****** *** capture). * ***'* *** **** ********** that ********** ***** ** *** **** during * **** ***** ** ********, but ** ** ***'*, **** ******* captures **** ********* ****** ** *** cycle ***** *** ** ********** ****.

*** ***** ***** ** **** **** saturated ** *** ***** ***** (**** and *****), ***** ******** **** *** camera ** ****** ********** *** *** scene ** ***** ** ******* ***** to ***** *** ****/******* ***** *** get * **** ********* ***** *** a ****** ******* ** *** ***. My **** ** **** *** **** is**********, ********* *** ******* *********** *********, which ******** **** *** ******* ***** can ** *********. * ***'* **** the ****** ** ********, *** * don't **** ** *** ******** ***** it ********** ** *** * ****** shot ** *** ***** ******, ** just ***** ** ** **** ***** is ********* *** * ****** ******* from **** ******.

* **** *** *** ** *** word "****" ***********. ** ** *******, the ******* *** * ****** *******, but ***'** ******* **** ******** **** Axis ** "****" (*** **** ** a **** ********** ******** ** ***** DNR, *** *** * ****** ******). But ****, ** *** ********* ************, we're ** ****** ******* ** **** what ****** ********* **** *******. * am ******** **** ** ******* ***'** using ********* *** ******, *** **** didn't ****** *** *******/******.

********* ******** ** (********* **** ****** a **** *******): * *** **** experimentation ** * *** ****** * once ****** **. ** *** ******* speed ** "****" ** * *** light *******, ** ***** ** ***** "stacking" ****** ** *** **** ** see ********** ****** **** *******. **** is ********* *** ***** ** ***** the ****. ******** *** ***** ** spatial (*******) ** *** ****** ***** the **** ***. * ***'* **** if ****** ** ***** **** *****, but * ***** ** ***** ** a **** ******** ** *** ***.

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