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 *** ***** ************, ** ***** ** **** ********** ** varying ****:

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

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

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

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

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

*** ***** **** ** ******** ******* ** *** ***** **** trying ** ****** ***** (***** ** ***** ** *** ********** of **** *****).

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

Locking Down Network Connections Guide on Apr 23, 2019
Accidents and inside attacks are risks when network connections are not locked down. Security and video surveillance systems should be protected...
Speco Ultra Intensifier Tested on Apr 22, 2019
While ISC West 2019 named Speco's Ultra Intensifier the best new "Video Surveillance Cameras IP", IPVM testing shows the camera suffers from...
Arecont Favorability Results 2019 on Apr 22, 2019
Arecont's net negativity remained the same in IPVM's 2019 integrator study, though integrator's feeling became relatively more neutral compared to...
H.265 Usage Statistics on Apr 19, 2019
H.265 has been available in IP cameras for more than 5 years and, in the past few years, the number of manufacturers supporting this codec has...
Door Operators Access Control Tutorial on Apr 17, 2019
Doors equipped with door operators, specialty devices that automate opening and closing, tend to be quite complex. The mechanisms needed to...
Pole Mount Camera Installation Guide on Apr 11, 2019
Poles are a popular but challenging choice for deploying surveillance cameras outdoors. Poles are indispensable for putting cameras at the right...
Spring 2019 IP Networking Course- Register Now on Apr 04, 2019
Register now for the Spring 2019 IP Networking course here. Just $299 for the course. This is the only networking course designed specifically...
Startup Spectral Edge RGB+IR Claims "Unique Low Light Performance Tech" on Apr 03, 2019
This UK startup, born out of university research, is boldly proclaiming that they deliver "Unique low light performance tech for video surveillance...
Axis 5MP P Vs Q Camera Shootout (P3227-LVE vs Q3517-LVE) on Apr 02, 2019
While Axis' Q3517-LVE tested well, it is one of Axis' most expensive dome cameras, over $1,000 USD. Because of this, members asked us how it...
Bezos-Funded Deep Sentinel Tested on Mar 28, 2019
Backed by Jeff Bezos, the Silicon Valley startup, Deep Sentinel, has declared: No One Does Home Security Like We Do Our Surveillance Team has...

Most Recent Industry Reports

19 Facial Recognition Providers Profiled on Apr 23, 2019
IPVM interviewed 19 facial recognition providers at ISC West to understand their claimed accuracy, success and positioning. 9 from China, where...
Locking Down Network Connections Guide on Apr 23, 2019
Accidents and inside attacks are risks when network connections are not locked down. Security and video surveillance systems should be protected...
Hikvision Admits USA Sales Falling on Apr 22, 2019
Hikvision, in a new Chinese financial filing, has admitted that its USA sales are now falling. Less than a year after the US government passed a...
Speco Ultra Intensifier Tested on Apr 22, 2019
While ISC West 2019 named Speco's Ultra Intensifier the best new "Video Surveillance Cameras IP", IPVM testing shows the camera suffers from...
Arecont Favorability Results 2019 on Apr 22, 2019
Arecont's net negativity remained the same in IPVM's 2019 integrator study, though integrator's feeling became relatively more neutral compared to...
H.265 Usage Statistics on Apr 19, 2019
H.265 has been available in IP cameras for more than 5 years and, in the past few years, the number of manufacturers supporting this codec has...
ACRE Acquires RS2, Explains Acquisition Strategy on Apr 19, 2019
ACRE continues to buy, now acquiring RS2, just 5 months after buying Open Options. One is a small access control manufacturer from Texas, the...
Access Control Course Spring 2019 - Last Chance on Apr 19, 2019
 Register for the Spring 2019 Access Control Course----Closed IPVM offers the most comprehensive access control course in the industry. Unlike...
Riser vs Plenum Cabling Explained on Apr 18, 2019
You could be spending twice as much for cable as you need. The difference between 'plenum' rated cable and 'riser' rated cable is subtle, but the...
Verint Victimized By Ransomware on Apr 18, 2019
Verint, which is best known in the physical security industry for video surveillance but has built a sizeable cybersecurity business as well, was...

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