Camera DNR (Digital Noise Reduction) Guide

Author: Ethan Ace, Published on Nov 20, 2014

Bandwidth spikes are a significant video problem.

An IPVM study found 250 - 500% increase in bandwidth from day to night (see: Testing Bandwidth vs Low Light).

Digital noise reduction is key for reducing night time bandwidth and preventing dramatic spikes which can kill your surveillance storage. In this guide we answer three key questions:

  • How much of an issue are bandwidth spikes?
  • How much does DNR reduce bitrate?
  • What impact does DNR have on image quality?

In order to answer these questions we tested 11 cameras from eight manufacturers in an approximately 1 lux scene, adjusting DNR to various levels from off through maximum, while measuring bandwidth.

  • Arecont Vision AV3116DNv1
  • Avigilon 1.0-H3-B1
  • Axis Q1615
  • Bosch NBN-733V
  • Bosch NBN-932V
  • Dahua IPC-HF3100N
  • Hikvision DS-2CD864FWD
  • Samsung SNB-5004
  • Samsung SNB-6004
  • Sony SNC-VB600B
  • Sony SNC-VB630

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

** **** ***** ***** *** - ***% ******** ** ********* from *** ** ***** (***: ******* ********* ** *** *****).

******* ***** ********* ** *** *** ******** ***** **** ********* and ********** ******** ****** ***** *** **** **** ************ *******. In **** ***** ** ****** ***** *** *********:

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

** ***** ** ****** ***** ********* ** ****** ** ******* from ***** ************* ** ** ************* * *** *****, ********* DNR ** ******* ****** **** *** ******* *******, ***** ********* bandwidth.

  • ******* ****** **********
  • ******** *.*-**-**
  • **** *****
  • ***** ***-****
  • ***** ***-****
  • ***** ***-*******
  • ********* **-*********
  • ******* ***-****
  • ******* ***-****
  • **** ***-******
  • **** ***-*****

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

What ** ***?

******* ***** *********, ** ** **** ******, **** ** ****** digital ***** ******* ** *** ***** ************ ******.

**** ***** ***** ************* **** *******. **** ** ** ********* **** *** ********** *** ***** in *** ***** ************, ** ***** ** **** ********** ** ******* gain:

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

  • ******* ***** ** *** ***** **** ******** **** ******* (***** is ***** ****** **** *** *********** ******* **** - * completely **** *****)
  • ******** ********* *********** ******* *** ******* **** *** ******* ***** as ****** ******* **** *** **** ********* ** ******.

******* ***** ********* *** ***** ********** ********** **** *** ** eliminate *** ******* ***** ** ******* *** ***** ******* *** to ***** *** ********* ******** ** ********.

*** *** ******** ***** ***** ** *** *** * *********** and * *********** ***. * *********** ********* **** ********** ***** / ***** ************, ***** * *********** ********* ****** * ****** of ****** **** ****.

*** ***** **** ** ****** *** ********* ***** **-***** *** camera ** ** **** **********.

*** ***** **** ** ******** ******* ** *** ***** **** ****** to ****** ***** (***** ** ***** ** *** ********** ** this *****).

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

** ****** ** ******* **** ***** *************. ** *****, **** three (********, ****, *****) *** *** ***** *** ******* ** digital ***** *********. ** ****** *** ******* ** *** **** scene, *** ******** ********** ****, ** *** **** ******* ********* DNR ******** *** ** *******.

*** ** **. ***

** **** ******* ******, ********* ******* ** ** ******* ** ~70% **** ******* *** ** ** ******* ********. **** * single ******, *** ******* ***-****, *** ********** ***** ***** ******.

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

*** ******* ** ****** **** ******* ******** ** *** ******* offered ** *** ****** ****** ******. ** **** *******, **** as *** ******* ********** *** *** ******* ***-****, **** ******** in *** *** ****** ** ******. *******, ****** *** **** greater **********, **** *** ******* ***** *** ********* *** (~**%) and *** ***** ***-**** (~**%). **** **** ********** *** ******** to **** ****** *** ****** ** ****, ***** *****.

DNR ****

******** **** ****** ** ******* ***** ********* ** *** ******* drawbacks, ** ** *** ********* ****** **** ***** **** ********* the **** ******* ** **** *******. **** **** ** ****** caused ** ******** ***** *********, ***** ******** ******* ** *** ***** ******* ****** ** order ** ********* **** ** ***** *** **** ** ***.

*** *******, *** ***** ***** ***** * ******* ***-**** ** maximum *** ********, **** ********** **** *** ******** ** *** subject ***** ******* *** *****.

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

*******, **** *** ***, ******* ***** ********* ************, *** **** is **********:

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

**** **** * ******** **** ***

Comments (4)

Since then if you do use the DNR, you bound to get some blurries anyway,

maybe it would be better to leeve shutter open longer instead? Instead trying to fixate pixel later from worse image?

Which blurry is worst, dnr, or slow shutter?

No, slow shutter is worse.

first of all - thank you for a nice table.

But why had you choose Samsung for supporting video, comparing with your statement that their implementation of noise reduction has practical no impact to bandwidth? how it is looking with other cameras that are more bandwidth-sensible?

It's true that the 6004 had little effect when changing going from its default setting to its max, but it actually had a considerable effect (87%), when going from off to default setting.

Though I'm curious why the 5004 (which is in many ways similar to the 6004), is so unresponsive to DNR, merely dropping the rate from 2.64 to 2.43, barely affecting it. The reflexive reason of 'it must not be doing as much DNR' is confounded by the fact that its bitrate is the lowest by far with DNR off. So low in fact that it's bit rate is still lower than all but two of the other cameras even with DNR set to default. Implying that there isn't so much DNR because there isn't so much DN, or the DNR is always on...

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports

Axis Vs. Hikvision IR PTZ Shootout on Sep 20, 2018
Hikvision has their high-end dual-sensor DarkfighterX. Axis has their high-end concealed IR Q6125-LE. Which is better? We bought both and tested...
IP Camera Cable Labeling Guide on Sep 14, 2018
Labeling cables can save a lot of money and headaches. While it is easy to overlook, taking time to label runs during installation significantly...
October 2018 Camera Course on Sep 13, 2018
Today is the last day to save $50 on the October 2018 Camera Course, register now. This is the only independent surveillance camera course,...
VMS Export Shootout - Avigilon, Dahua, Exacq, Genetec, Hikvision, Milestone on Sep 13, 2018
When crimes, accidents or problems occur, exporting video from one's video surveillance system is critical to proving incidents. But who does it...
Door Fundamentals For Access Control Guide on Sep 12, 2018
Assuming every door can be secured with either a maglock or an electric strike can be a painful assumption in the field. While those items can be...
IP Camera Cable Termination Guide on Sep 06, 2018
Terminating cables properly is critical to network performance, but it can be a tricky task with multiple steps. Fortunately, this task is easy to...
Drain Wire For Access Control Reader Tutorial on Sep 04, 2018
An easy-to-miss cabling specification plays a key role in access control, yet it is commonly ignored. The drain wire offers protection for readers...
IP Camera Cabling Installation Guide on Aug 29, 2018
IPVM is preparing the industry's first Video Surveillance Installation book and our upcoming Video Surveillance Installation Course. We have...
Exit Devices For Access Control Tutorial on Aug 28, 2018
Exit Devices, also called 'Panic Bars' or 'Crash Bars' are required by safety codes the world over, and become integral parts of electronic access...
Inputs/Outputs For Video Surveillance Guide on Aug 24, 2018
While many cameras have Input/Output (I/O) ports, few are actually used and most designers do not even consider them. However, a good understanding...

Most Recent Industry Reports

Genetec Takes Aim At 'Untrustworthy' 'Foreign Government-Owned Vendors' on Sep 24, 2018
Genetec is taking aim at 'untrustworthy' 'foreign government-owned vendors'. This is not a new theme for Genetec as nearly 2 years ago, Genetec...
4MP Camera Shootout - Axis, Dahua, DW, Hanwha, Hikvision, Uniview, Vivotek on Sep 24, 2018
4MP usage continues to climb, especially for low cost fixed lens models. To see who was best, we bought and tested seven 4MP models from Axis,...
Alexa Guard Expands Amazon's Security Offerings, Boosts ADT's Stock on Sep 21, 2018
Amazon is expanding their security offerings yet again, this time with Alexa Guard that delivers security audio analytics and a virtual "Fake...
UTC, Owner of Lenel, Acquires S2 on Sep 20, 2018
UTC now owns two of the biggest access control providers, one of integrator's most hated access control platforms, Lenel, and one of their...
BluePoint Aims To Bring Life-Safety Mind-Set To Police Pull Stations on Sep 20, 2018
Fire alarm pull stations are commonplace but police ones are not. A self-funded startup, BluePoint Alert Solutions is aiming to make police pull...
SIA Plays Dumb On OEMs And Hikua Ban on Sep 20, 2018
OEMs widely pretend to be 'manufacturers', deceiving their customers and putting them at risk for cybersecurity attacks and, soon, violation of US...
Axis Vs. Hikvision IR PTZ Shootout on Sep 20, 2018
Hikvision has their high-end dual-sensor DarkfighterX. Axis has their high-end concealed IR Q6125-LE. Which is better? We bought both and tested...
Avigilon Announces AI-Powered H5 Camera Development on Sep 19, 2018
Avigilon will be showcasing "next-generation AI" at next week's ASIS GSX. In an atypical move, the company is not actually releasing these...
Favorite Request-to-Exit (RTE) Manufacturers 2018 on Sep 19, 2018
Request To Exit devices like motion sensors and lock releasing push-buttons are a part of almost every access install, but who makes the equipment...
25% China Tariffs Finalized For 2019, 10% Start Now, Includes Select Video Surveillance on Sep 18, 2018
A surprise move: In July, when the most recent tariff round was first announced, the tariffs were only scheduled for 10%. However, now, the US...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact