Obstructed Lettering A Problem For LPR Testing

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Rob Kilpatrick
Published Dec 21, 2023 13:00 PM

In our extensive LPR testing of numerous license plate recognition providers, obstructed lettering was found to be an issue that impacts LPR performance.

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In this report, we examine how obstructed lettering impacts LPR performance, which system had the best and worst performance, and what steps can be taken to deal with this problem.

**** ****** ** ***** ** *** testing ****** ***,**** ***-**-*** ***,******* ****** ***,****** ***,******** ***,***** **** ***, ********** ***.

**** ** *** ****** ****** ** a ****** ** *** ******** *************** ******* ***** ****** ***** ******** for *** (******),******* ********* ****** ******** *** ***, ******** ***** *** ***** **** ***** Problems *** *** (******).

Executive *******

********** ********* ******* *** ******** ** 10-20 ********** ****** **** **** ******* (97-100%) ** ******** ***** ********* ****** to ** *** ** ~**% ** Verkada *** ******** *** ** **** as ~**% ** *****.

** ***** *** ********* ** ******** the ********** ** ******* ********** *********:

  • **** ******** ******** ** ** ********* can ***** ******* ************ ** ********* in **** * *** ** ***** setting.
  • **** ** *** ** * ******* plate **** ***** ********* ** * plate, **** ****** *** ** **** in ***** **** **** ***** ** vehicles **** ******** **** *****/***** *****.
  • **** ** * ***** **** *** sun ** ********* **** *** ********* off **** **** ********** ********* ** a *****.
  • ******* **** ** **** ***** ** trailers *** ******** ********* ** * vehicle.

** ***** **** *** **** ******** to ******* * ****** ****** ** reading *** ******* ********* *** ** keep *** ***** ~*** ** *** systems. *** *******, ****** *******, ******* a ******** ****** **** **** ******** the ********** ** ****** ***** ***** in * ******. ****, *******, *** the **** ****** **** ***** ******** a ***** *** ****** **** *** allowance *** ********* ** ** ** two ******* *** ******** ******.

Obstructed ********* **** **** ~*% ** ******** ** *** *******

****** *******, ********** ********* **** ** less **** ~*% ** ******** ******* plates. ********** ********* ********* ** **** and ***** **** ****** ******* ***** covers, ***** ********* ******** *********, *** partial ************.

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Best ******** *** ***** ~***

** ***** **** *** ***** ***** not ****** ** *****, ** ** system ***** **** ********** ********* ********* 100% ** *** ****. *******, ********** PPF **** ~*** - ***, ** the ***** *** ***** *** ********* exposure ** ** *********, ***** ****** the ****** ** ********* *********** ****** and *********** *********.

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Partial ************ **** ****** ***********

******* ************ ** ******* ****** *** the **** ****** ****** ** ***********, it ***** ** ****** *** *** during *** *** ** ** ************ at *****. *** **** *** ** combat **** ******* ************ *** ** adjust ******** ** ** *********.

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******** **** ***** *** ****** ** fix ************ *** ** ****** ** available ******** ** *** *********.

Wear **** **** ***** ***********

****** ********* ******* **** *** ******** and ********** **** **** ****** *** lettering ** **** **** *** **** show * ******* ** *** *****, which ****** ****** **** *****.

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Dirt ****** ***********

**** ** * ***** *** ***** lettering, ***** ******* *** ****** *** LPR ****** **** ********* **** *** plate. ** * ***** **** * dirt **** ** ***** **** ****** drive **********, **** ***** ****** **** often.

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Objects ******** *********

*******, ** ***** **** ******** ****** trailers ** **** ******** **** **** likely ** **** ******* **** ******* the ***** *********. ** *** ******* below, ***** *** ** ***** ******* are ********** *******.

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Wildcard ****** ******** ******

******* *** **** ****** ********** ********* license ****** ** ******** * ****** with ******** *********, * ****** **** a *** ** ********* ********* *** wildcard *********(*), **** ** ******* ***** below:

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*** ******* ******, ***** ****** ********* **** *** hotlist ******* ***** ** ** ** two **********, ** ** *** **** license ***** ** *** ****, *** the ********** ******** ***** **** ** the ********* ******* *****, ** **** create ** *****.

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************, ********'* ***** ******** ****** ****** the ****** ** ****** **** ****** misread *********, ****** ** **** ****** to **** * ***** ** ******.

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