Infrared IR Surveillance Tutorial

Author: John Honovich, Published on Jan 12, 2013

Almost all surveillance cameras perform worse in low light than they do in the day time. One of the most common techniques to overcome this is to add Infrared (IR) illumination. However, a number of options exist as well as issues in using IR. This tutorial explains them including:

Original Reporting

  • ** *********** *** *********
  • *** ****** ****** - */* *** ***** *******
  • ** *** *********
  • ******** ***** / **********
  • ************ / ************ ******
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  • ********** ** ** *** ** ** ************

**** ******** ** ***** ** * ******** *** **** *******. For ****, ***:

IR ******

** ** ***** **** ******* *** '***' *** ****** ******. Humans *** ** *** *** ** ***** ***** - '*******' light. *******, ************ ******* *** ********* '***' ******* ***** ** well ** ***** **** ***** **** ** ************ ********* ** 850nm ** ******.

ir

***** ******* / ***** ***** ** ** ******, ************** ** surveillance, ** ** ****. **** * ******** ***** *** ** *************** ********* ****** ************ *****. *************, ******* ****** ******** *** be ****. ****** **** ******* ************, *** **** ********** ** IR ************ ** ***** *** ***** ********* *** ******** **********.

*******, *** **** ****** ********* ** ************, *****, ** *** completely ****** *** ******** * *** **** ** ***** ******** when ******* ******** ** *** ******. ****** ***** ************ ****** this *******, **** **** **** *** ******** ******* ** ***** half, ************* ********** *** ***** *** ****** ********. ** ****, they *** ********* **** **** ** ******** ************** ******** ***** any ********* ** ****** *********** (**** *** *** ****) ** a ****. *******,****** *************** *********, ******** ** '*********'. *******, *** **** ****** **** for ***** ***** *** ******* ****** *************** **** **** **** rarely **** ** **********.

Cut ****** ****** - */* *** ***** *******

**** ************ ******* *** ** *** *******, ******** ** *****, which *** **** * ***** ****** ** ***** ** ************. Blocking ** ************ **** ******** *** ****** ****** *** *** is ********* ** ********** ***** ***** *******. ** ****, **** cameras ** **. *******, ***** ********** ***** ** ****:

  • * ********* ** *** ****** **** ** ***** *** ****** blocks ** *****. **** ** ********* **** *** ******* ******** as '*****' ** '***** ****'. ***** ******* *** ***** ** IR *****. ** *** *** ** ** *********** ** **** a ******, *** **** ***** *** ** *** *** ********** or ***********.
  • * ********** ** *** ****** **** ** *********** ***** ** and *** ** ***** ** ***** ** ******. **** ** typically **** *** ******* ******** ** "***/*****" ******* ****** *** ***, *** ** ****** ** **, blocking *** ** ***** *** ** ***** *** ** ****** is ***, ******** ******* ** ***** **. ** *** *** an ** ***********, ** **** ** *** **** ** ** 'night ****', *** ****** ****** ****** **** ********.***** ** **** an ** *** ****** ***** ****:ir cut
  • ******* ********** ** *** ******* *** ** *** **** *** cost ** *******, **** ******* ***** **** *** ********* ** illumination ****** *** ******. ***** ******* **** ** ** *** filter ** ***, ****** ** ** ************ ****** *** *** and *****, ***** *** ******* *** **** ***** ***********. ** a ****** *** ***** ** ** **** *** **** *** say ** ** '***/*****', ****** ** *** ** ** ****** at ***. **** ********* ******* **** *** **** ** *******.

** ***** *****, **** ***/***** ******* **** ********** *** ******* are *** **** ****** *********** ** ***** ** ** **** typically ******* *** **** *** ***** *********** ** *** *** 'IR ********' *******. ****** *** ******** *****/***** ** ** ********** * **********.

IR *** ***********

**** ****** ************* **** *** ****** ** ** **** ** an ********* ** ***** ***********, **** ** '** ****** *** 24 **** *** ** ********** **** *** *, ***.' ** recommend ******* ** ***** **** ** * ******.

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

  • *** ****, *** ***** ******** ** ****
  • ****** ****, ****** ***** ************ ** **** (*** ** ****)

***** ** * ******** ** *** *** ********* ***** / types:

high vs low

** ****, **** ****** **** ******* **** **** ***** ****, they *** ***** **** ** ******* *** ******* ********. ************, the ******, ****** **** ** **** *** ** **** ******** and **** * ****** ******** **** *** ******* ******** ****. For *******, ****** **** *** *** ** ** ************ *** the ****** ****, ************ ** **** ***** *** **** ********** IR ******* ***** *** *** ******* ******** ****. **** *** last ****, * ****** ** *** ****** ********** ** ****** offerings *** ****** ** ************ ** ****, ***** * ** 5 ****** *** ****** *******.

*** **** ******* ** ** *** ********* *** *********, *** our** *** ******.

IR **** **************

*** ** ************ **** *** *** **************, *** ** ***** can ** *******, *********, *** *** ***** *** ***, ********.

*********

*** **** ****, ** ******* **** ** ** *********** *** ***** (*.*., 60°, **°, **°, ***.). **** *** ** ******* ** ** is * ****** *************** ******. *** *** ***** **** ** matching ** *** ********* ** *** ****** ** *** ********* of *** ** ***********. ** *** ** *********** ** *** wide, ******** ** ****** *** ******* ******** ********** *******. *******, if ** ** *** ******, *** ***** ** *** ***** are **** *** * ******* ** ******* ** *** ******. The ***** ***** ***** ****:

beamwidth too narrow

********

*** *** ** ** *********** *** '***** **' ** **** from *** ****** (*.*., ***', ***', ***', ***.). **** *** generally *** ** ******* ** *** ******* ****** ******** **********:

******* ** ********: ***** ***** ****** ******* *** ***** ******** ** ******* IR ************ *** ******** ********* **********. *******, ** **** ******** in ******* ****, ******, ***. **** ******* ******** ** ******* and ********** **** ***** *****, **** ******* * **** ****** image ** *** **** ******** ** *******.

*************, **** ** *********** / ****** ************ **** ***** ******* indoors ** * *** **** **** * ***** ****. **** is *** ******** **** **** ********.

************ *********: **** *** *****, ** ************ ***** ***** ** *** square ** *** ******** **** *** ******, ***** ***** ** drops ****** *******. *** ****** ** ***** ** *** ******* specified ***** *** ** ***** *** *** ***** *** ****** to *** **** **** * ***** ******* ** * ******. Remember, **** **** **** ******* *****, ** *** ** *** have ****** ** ************, **** ***** **** **** **** *** noisy.

***** *** *** **************** *** ****** ** ** ************ (****'* ***), **** ************* ********* ** *** ******* ******** ****** ** a *** ************ ********* ****.

** * **** ** *****, ****** */*** ** */* **** distance **** *** ************* ****** *** ******* ***. ***, ** course, ******* *** ************** *** *** ** ******* **********, ** a **** ** **** *** ********** ****** ******** *** ****** / ***********.

Spotlighting / ************ ******

***** *** ****** ** *** **** ** ************, **** **** you *** ** ******* ****** *** *** ** *** **** sunlight. ******, **** ** * **** ****** ********* ******* **** IR ************.

** ************, ** ************ *** ********* ***** **** *********** ** spotlights, **** * ****** ************ ********** ***** ***** ******, **** to ******** ***** **** *** **** ************. *** ******** ** this ** **** * ******* **** *** ***** ** *** IR ***********, ******** ** *** ***** ******, *** ****** **** be *********** ******* ** *** ****** *****, **** **** * person *** *** * ********** ******* ** ***** ****. ****'* an *******:

ir overexposed

******* ** ****, ** ************, ********* **** **** ***** ** field. ** * ******* ** *** ***** ** *** ******, they **** ** ***********. ** **** *** *** ***, ***** will *** ** ****** ** ** ********** *** ******. **** is ************* **** *********** **** **** ******** ** ***** ******** whose ********* ** **** **** ****.

*** **** ********* ***** ***** **** ******* ** *** ****** far ******* ***** ** **** *******. ** ** *********** ***** *** *** ****** ***** ** a **** *** ********* ** ***** ** ** ****** *** but ** *** ******* ** ** ****** ****, ** *** power ******* *** ****, *** ******* **** ** *** *********** and ****** ***.

Advanced ** *********** ********

*******, ***** *** * ****** ** ******** ** *********** ********, one ** ***** ********* *** ***** ** ************.

***** / ******** **

* *** ********** ** ******* *** ************* ********* *** ** power ****** ** * ******* ** ******** ****** ** *** camera, ********* *** ******* ******** *** *********** ************. ****'* ** example ** **** ** **** / ***** ****:

**** ** * ********* ******* ****** **** *** *********** ** mind:

  • ** ******** *** *****, *** ******** **** *** ******* **** in *** **** ***** ** *** **** **** **** ** under-exposed **** *** ******* ****** ****.
  • **** ********* ***** ** ** ***** **** * ****** ******* the ****** ***** ** ***** ****** ** ** ****** ** present *** **** *********** ****** *** ** ***********'* ***** ******. It **** ******* ** *** ****** ****** *** ******* ********.

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

******** ** ********* *** ****** *** *** ** * *******. Increasingly, ******* **** ********** ** *** ********* ***** ** *** check **** *** ******'* *** ** *** ****** *** ** illuminator *****.

IR *** ********* *******

***** ** ******* ********** **** ********* ******* *** ******* ** purchase ***** *******, ***** ****** *** *** *********, ** ***** / **************** ******* ************.

**** ************ ** ****, ******* **** **** ******* ** ******* an *****. *******, **** ******* ****** ******* *****, ***** ***** encoding **** *********, ********* ********* ********* ****** *************. **, **** visible *****, ********* *** ************ ********* ** * ******. **** greater *****, *** ****** ***** **** **** *******, ******* ******** bandwidth *******.

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

  • *** ** ************ ***** ** ***** *** ***** *****. ** certain ***** *** ***** ****, *** ****** ** ****** ** turn ** *** **** ******* ** ******** ***** *****, ***** requiring **** ********* ***********.
  • ** ****** ****** ********* *********** ** *** *****, ********* *** ******* ** ***** * *** ** *** ****. *** ***** *** ***** **** *** ****** ****** ******* as *** ***** ** ********* ** ****** ***** **** ** meaningful *******.

Integrated ** ** *** ** ** ************

**** ***** **, *** *********** ******* *** ********* - ******* with ** **** ********** **** ***** ******** *** ** *********** appliances **** *** ******* **** ** **** ** *******. ** the ****, **** *** ** ******* ******* ********** ** **** so **** **** ****** ** *** ** ************ ** **** wanted **. ***, ****** *** ** ****** ***** **** ********** IR ****** *******.

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

  • ********** *** ****: ******* **** ********** ** ********* **** **** ~$100 *** **** **** ** ********** *** ** ******.
  • ****** ************: ******* *** ** ** ***** **, ***** ** no ********** **** ** *******.
  • ****** ********: **********, *** ********** ** *********** ** ***** ** the **** *** ***** ** *** ******.
  • ******** ********: **** ****** *** ******* ***** ***** / ******** IR *** ********* ********* **********, ********* *** ******** **** ***-** IR ************.

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

  • ******* ********: ****** ** ********** ** ****** ** ***** *** **** than *** **** *** **** ******* ****** ****** ** ** more **** ** **** **** *** ******. ** ****** *** away ** *********, ** **** ******* ***** ********** ** *******.
  • *** / ****** ******:
  • *********** ******

**** *** ***** ****** ** ********** ** ****** ******* *** advanced ********, ** ** ************ ****** ** ******* ***-** ** illuminators. *** ******** ****** *** **** ** **** ******** **********.

Original *********

**** ******** ** ***** ** * ******** *** **** *******. For ****, ***:

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

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

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