Shutter Speed In LPR Situations

Hello, I´m working on setting up LPR camera along with an IR illumination.

What are your thoughts in ideal exposure in total darkness to catch a license plate number on a car travelling maybe 60-80 km/h?

My thought was about 1/1000 , with a high power IR light and a zoomed camera to a fixed field of maybe 2-3 meters where the cars plate will always pass.

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******,

**** ** ******** ** *** ***** ***** *** *** ******* speed. **** **** ****** **** ******* ** ****** *** ******* speed ** ********* ******? * ** ******** **. ** **, simply ********** **** * *** ****** *** **** */**** ******* 1/2000s ** *** **** ***** **** *** **** ******** ***** / *****.

** ******** ** **** ***'* **** ** **** **** ******** first ** **** *** ***** ** ********** ** ******-********** **** in *** ******* ******** ********** *** **** **** ** ** - **** ******* *** **** ** ****** ******** *** ** lighting ******, ** ** **** ** ********** ** *** ********* conditions.

**** ***'* *** *** ************ ** ****** *** ****** ***** with **** ********, ** ***'** *** *** **** ******* ********** of ******* *****.

**** ****, ** **** *********, ***'** ******** **** * ****** fast ******* ** ***** ******** ** ******* ** ****/*, *** that ***** * ******** ***********.

****, *** ****** *** *******, *** ***** *** ******** *** need ** **********, *** *** ***** *** ********, *** ***** the ***. **** ** **** ** *** ****** *** ***** cameras *** * ****-******* ****** - **** **** ** **** substantial *** ** *** ***** ******** ******* *** ***** ** an ************, ***** ***** * ******* ********, *** **** *****. Of ******, ** ***'** ********* *** ***** **** * ***** aperture, *** *** *** * ****** *******... *** ***** ****** then "*******" *** *****. ** **** ********, *** ******** ***'* need **** **** ***, ******.

*** ***** ***** ** ******** ** **** *** **** ********-** your ****** ** ** *** *****, *** **** ****** **** you'll ***, ******** * ****** *******.

**** ****** *** **** *** *** *****? *** *** *** from *** ****** **** *** ******* **** *****?

***-*******-*** **** ** * *** ********* *********** ****** *** * Raytech ** ***********.

******** **** ****** ** ******* ***** **** ** ****** **-*** at ***** **° *****

********* ** ****'* ******* ** *** ***** ***** ***** ** that *** ** ****** ***** ****** ** ***** *** *** time **** ****** ******* *** *** ******* ** ***** *** any ******* ** ***** ** *** ************ **** *** **** the ****** (****** ********, **** *****..)

I **** ***** ** ********* ***** *** ****** ** ***:

- *-** **focal ****** with********* ******** ***** *** ***** ****** ********* ** **** ****** ***** and ********.

- *-** (** **-****..) ***** *** * **** ******* ********, generally ** * *** ****** ********** **** ** *** *** ******* ** ****/*

-***(*****************)****** ** ********** *** ** ****** *****. ** **** ***********, ** *** are ***** **** ** ********** **** *** ***** ******* ** 1/800, */****.**** ************* ** **** *** ** ***** ***** , ******* ** -30 ******* ** ******* ** **** ******* ********

-Switch ** */* and IR ****** ** ************* *********** ***** **** **** ****** **** * *** ****** ********* to */* **** **** ***** ****** ******* ** *** ******* and *******. ** *** **** ** ***** **** ****** ** switch ** ** **** ****** **** *** ****** ******* **.** you *** */*** ** */**** *** **** ****** *****'* ****** or *** **** ** ** ****, **** *** ****.

... *** ****** * **** **** ** ********** **** ******* to ****** **B/W ** *** ***. That way , your camera will never run out of light in color mode (the camera switchs back in color at 600 lux)

-Two ** **** ***** projectors 10/15° each able to cover 50 m or more" depending on your lenses and the number of lanes you want to take (IR equipped with sensors to remote control the camera day/night profile ?)

-Disable *** *** *** and any other post capture processing generating blurr and delay

-Avoid **** ***/*** profiles which consume more CPu (BAsic /Main should be sufficient) , use a reduced GOP,move to Mjpeg if you still have issues

-fps : try 25/30 fps and test it ,(don't choose 50 or 60 fps by default which consums much more of everything)

- **** **** **** *** **** ***is ********** versus Fps/resolution/compression, and will not decrease your image quality (test it as IPVM does) Be careful is your transmission is Wireless, with lower bandwidth than wires.

- ** *******: ******* ******** *** **** **** *****!

********* ** ****'* ******* ** *** ***** ***** ***** ** that *** ** ****** ***** ****** ** ***** *** *** time **** ****** ******* *** *** ******* ** ***** *** any ******* ** ***** ** *** ************ **** *** **** the ****** (****** ********, **** *****..)

****'* *** *** *** ** *** ******** ** *** ***** is ********** ** ******-********** **** **** ** ****** ********.

Switch ** */* and IR should be automatically monitored to avoid that your camera wait 1 Lux before switching to B/W this will occur blurry effects in the morning and evening. So you have to force your camera to switch tp BW much sooner than the sensor usually do.If you put 1/500 or 1/1000 but your camera doesn't switch or too late in BW mode, your are done.

*'* ******* ** ******** - ** ************ ***'* ** ********* in ***** ****, ** **** **** ** ** *&*, **** down *** ******** ** ******* ***** ***'* * ******, *** blast ** **** ** ** *** **** ******** ** ******** by *** ************. **** ***** *** ***** ******* **** *** light *****.

***** ****, * ** *** *****. *****/**** *** **** ** receiving **** **** **** * *** ****** * ***** **** of *** ********* **** **** *** *** ** **** *** your ****** **** ** ** ***** ** ** */* ******* IR , (** ** *** ****** **) ** ********* *** to **** ******** ** ** ****** ** ****. ** *** force ** */* **** ** *** ****** *** ****** *** day, ** & ** **** *** *** **** ****** ************. Moreover, ****** *** *** , **** ********* *** ****** ****** prefer ***** **** ** *** *** ***** *** ***** ** the *** *** ********** ******** *** ******. ****** **** *** color **** ** **** ** ** ***.

****** *** *** ** * ****** *** **** *** ****** (>15m) *** ** */****, **'* ******** **** ****** ** *** something ***** **** ** */* (* **** *****). ** *** obviously ******* ***** ******** *** ******* ****** *,**$ *** ******** (camera, ******, ******, **, ********* ******..)

**** */**** *** **** ** ********* **** **** **** * lux

*** ** *** ***** **** *** **** ** ****, ***** has *** ***** ******* ** ********** *** *** *********. *** who **** *** **** ** **** ** */****? *** ****** your *******, *** **** ******* ***'** **** **** ****** ****.

********, ****** *** *** , **** ********* *** ****** ****** prefer ***** **** ** *** *** ***** *** ***** ** the *** *** ********** ******** *** ******

****'* *** *** ***** ** *** ******. **** * ****** wide-FOV ****** ** *** *** ****. ***'** ****** ** **** one ****** ** *** ****, **** *** **** ** ** do *** ******** ***** **** ****.

*'** ****** **** *** ** ** ******** ********* ******** *** end ** *** ******. ****** ***** **** ***** (***-**) *-**** lens. ** ******** ****** **** ****... **** *** ******** *** right. **** ** *****, ** *** *** *** ***** **** enough, * ***** *** * ***** (*** ***** ******* *** color-only *** *** ** *** **** ** *** *****). ******* problem * *** *** *** ******** ********. * ***** *** driving ******* ***** ***** *** ******** ** ***** *** ********** around ***** ** ****** ***. * ***** *** ** * sunny *** ***** **** *** ***** ***** *** *** ****. I ****** **** ******** *****, * ********* ******* *** ** response *****... ******* *** ***% *********.

********: **** ******* ***** *** ** *** ******** ********.

********: **** ******* ***** *** ** *** ******** ********.

** *** ***** ******* ***(*** **** ** *****).

**, **. ****** ******** *** ***/***** ******* ****** ****'* ********** to *** ***** ****** **** **:** ** **:** ******** *** ambient ***** **, ** **** ****.

**'* **** **** ****** **** **** ***** ** ** **/*. (56 ***) *** ********* ******* *** **** *** ** ****** when *** **** *** *** ********* (** *** **** *** car **** **'* **** ** *****)

Double ******** are recent at Hik and some others (Axis..) but exist since a while in Taiwan. (I don't quote brands..) i's good for slow speed : profile with WDR, profile without WDR.and so and so.

* **** *** ****'* ***** ** ******** ****** **** ** force ** ******. * **** ********* ** *** ** ** are ******* ** * ******* ****. ******** *'* ***** **** of *** **** *-****.

**, **. ****** ******** *** ***/***** ******* ****** ****'* ********** to *** ***** ****** **** **:** ** **:** ******** *** ambient ***** **.

***** *****, * ***** **** ******* ***** *** ****** ** get ***** ******. * ***** **** **/* ** ************ ** key.

*** * **** *** *** ***'* **** ** **** ******* light "*** ** *** ******** ********" **** **** *** ******, as *** *** *** *** ***** **** *** *** ******** and *** *** *** *** *** **** **** *******.

**. * *** ** ***. ****** ************ ********, ***** *** B/W **** * ****** ****** *** ******, *** *** *** probably ** *** ** **** (**'* *** *********) , ******** vehicule ***** *** ***** **** (******** ** *********), ** ! Nice ** *** ***** ** **'* *** * ***** *********! The **** ** **** * **** **** **** * ********* reality * *******. (**** *** **** *** ********... ** ** ah)

* ****** ** ******** **** *** ******* *** ***** ** the **** ** ****** ** **** ******* **** ***** ** 3D **** ******* ******** *** *** ***** ********** (******** ******** editors ***) . ** ********* * ******** ** *** ***** and ******* *** ***** ** ********, ** ****** **** ********* colors ** ****** ******...*** **** *** ***** ** * **** hoax? *** ** ** * ** ** *****

***, * ** ********* ** **** **** **** **** ** claims ****. *** ** **** ****** ** ** * **** camera **** ** **** ** *****.

***, *** **** ***** (*** *** **** ** *** ***** article) **** *****. ****, *** ********* **** ***** ** -** to ***, ***** ** **** ******.

* **** *** ****** ****** ***'* ** ***** ******.

* ***** ***** *** ******* ** *** ** **** ****, possibly **** ***, *** ***** ***** *** *** ********* *** they ****** **** **** ** *********.

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

* **** * ******** ***** *** ********** *** ******* ***** recommendation. *** *** ******** **** *** *** ****** ** ********* images (*********) ** ********* ** * ***** ******. *** *** aware ** ******* **** *** ****** *** ** * ***** stream ** **** *****? **** ***** ** *** ************** *** the ****** ******* ** **** ****.

****'* **** ***** ******* ** ********** ****** **********?

** *** *** ****** **** **** *** ************ ******** *********** frames **** * *****-*****, *** **** ***** **** *** *** LPR?

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

**** ******** ******* ****** ****** ** *** ****** *** ******* on *** ****** **** ***** ***. **** ****** ******* ** Mjpeg. **** *** **** ****, ****** ***** *** **** ***** to ** *** ********. **** ************* **** ****** ** * local *** **** * ******** ***