ALPR / NPR Recognition Accuracy and Issues

Author: Carlton Purvis, Published on Jan 15, 2014

Sick of red light and speed cameras? A lot of people are. There are entire websites and web forums devoted to the public’s disdain for automated policing. But is there a way to beat them? Forget the aerosol sprays and chunky license plate covers. In this post we show you, straight from a US government commissioned report, what things have been proven to give ALPR systems problems in reading plate numbers.

Because more and more law enforcement agencies are using automatic license plate recognition, the International Association of Chiefs of Police, with a grant from the National Institute of Justice was commissioned to asses ALPR implementation among U.S. agencies. It used results from 305 agencies across the U.S. including one of the biggest ALPR users, the Washington, D.C. Metropolitan Police Department. The final report is where this data comes from.

The most common types of ALPR being used by U.S. agencies is mobile. Ninety-five percent of respondents said they used mobile APLR, while under 20% use fixed or portable.

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

ALPR ******

******* **** ** **** **** ****** **** ******** ***** ** an *********** *******. **** *** *** ***** **** ****** *********** in *** ******:

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

******* **** ******* ***** **** ** ************, ****** **** *** bent, ***** ** ******* “*** ***** *** **** ******** ** misidentify * *********.”

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

**** *****, *** ******* *** **** **** *** ****** ******** obstructions **** *** **** ** * ************* ******* *****. ******** **** ******** * ***** ** **** *** ******* *** something **** **** * ******* ****, *** **** ******* **** SUV ****** **** **** **** *** **** *******.

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


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

“**** ******, ********** ******* *****, *** ** ********* *** **********[*] ** ****,” *** ***** ****. ** *****’* *** *** but ** **** *** ***** ****** *** * ***** ****** on *** **** ** **** ****** ** ***** ** **** a *****. *** **** ** ***** ******* **** **** ***** to ***** *** ****** * *****, *** ***** ** *** characters **** ****.

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

***** ****** **** *** ****** *** ******** ** * **** are ******* *** ******* *** ****** ** ***, *** ****** says, *** ** *****'* ******** ******* **** ** ****** ** worse *** *********** ***** *******. **** ******* ****'* ********** ** read ****** **** ***** ******. *** ****** **** *** ******** which ***** ***.

Capture *** **** *****

**** ** *.*. **** ******* *** **** ***** ** **** to ****, *** ***** *** *** ****** ********** *********** ***** for ******'********* ****** ******:

*.*. *** ************** ******* *** ******** ********* *******, **** ***** ********* ***** ************. Two ********* **** *** *****:

  • "********** ****** (**) ****** **********, *** *******, *** ********* **** a ****** ******* ******** **** **** ******* **,*** ******, ********* in *** ******** ** *** ******* *********, *** ************** ** 26 ******* **** ********* ********, ** ******* ******** *********, * stolen *** * ******* ******* ***** ****, *** * ******* in *** ****** ** ** ***** ** *** **** ** days."
  • ** **** **** ** ******** ** *** *.*. ****** ****** law *********** ******* ***,*** ****** *** “**** *,*** **** ******** in * *******, ** *****, ** *********, *** ********, *** burglaries, *** ******* ******, *** *******, *** *** ********* *****.”

ALPR ****?

******-**** ******* ** *** ******** ***** **** **** ** ****** for **** *****. **** (** *******) ******** ** ******** ** vehicle ********** *** ******* ** **** ***** ***** ***** ******** ALPR. *** ***** **** ****** **** **** **** ***********, ***** and **** ***** *********** *** *********** ******* ****.


Are * *** ** ******** ***** ****?

*** ****** ** ******** ***** **** ** ******* ******** ***** year. ** *** *** ******** ******** ** *** ****, ** (23%) **** **** **** ****. * ******* ****** **** **** found **** ****** ******** **** ******** *** ********** ** * faster ****. ** ***** ****** ******** (**,*** ** **** ********), 71 ******* *** ****.

Do **** ******** **** ******** *** **** ***?

**** ** ***. **** ** ******* ******** *** *** ******* policies *** **** ***.

How **** ** **** **** ******?

****** ** ******* ** *** ******** ******** ***** *** **** for *** ******, ** ******* ***** ** ************. ****** **** (43 *******) ******* ***** “*** *****” *****.

Comments (3)

As a manufacturer's rep, I know that we struggle with the issues above, but also personalized plates lack the reflective coating that standard-issued plates have, so that reduces the LPR camera's ability to "illuminate" the plate with IRs.

Does the report mention if white light is allowed in the US or only IR illuminator?

No it does not. The report mostly focused on stats and said very little about specific equipment.

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

Massive Leak Of Chinese VMS Provider Exposes Xinjiang Surveillance on Feb 20, 2019
A subsidiary of China’s claimed largest VMS provider is tracking the precise location and ethnicity of millions in China’s Xinjiang region,...
Austria’s First GDPR Fine Is For Video Surveillance on Jan 29, 2019
Should EU businesses be concerned if police see a business' surveillance cameras filming public areas? This is what happened with Austria’s first...
Mobile Surveillance Trailers Guide on Jan 17, 2019
Putting cameras in a place for temporary surveillance where power and communications are not readily available can be complicated and expensive....
The False SCMP Story on Hikvision NYC AI on Jan 14, 2019
In the past week, one of Asia's largest publications, the South China Morning Post (SCMP), posted an article about "Chinese [facial recognition]...
ASCMA / Moni Problems Deepen, Lenders Terminate Support Agreement on Dec 28, 2018
Ascent Capital Group, aka ASCMA, currently branded Brinks Home Security, formerly known as Moni and Monitronics faces a troubling end to a rocky...
Infinova's Xinjiang Business Examined on Dec 07, 2018
As pressure mounts for companies to stop doing business in China’s Xinjiang region amid a severe human rights crisis, IPVM has found Infinova sold...
Sublethal Camera Gun Examined on Dec 06, 2018
Sublethal is a South African company that manufactures a remotely-controlled, camera-enabled gun called the Boomslang, which is Afrikaans for tree...
UK ICO Denies IPVM GDPR Complaint Against IFSEC, Decides Each Exhibitor Responsible on Dec 06, 2018
The UK Information Commissioner's Office (ICO) has denied IPVM's complaint against IFSEC for misuse of facial recognition. Each Exhibitor...
ADT Wins Fire Death Suit But Faces Appeal on Dec 05, 2018
ADT/Protection 1 has won a wrongful death court case in which it was sued by the estate of a deceased customer. However, the attorney for the...
Evidence of Dahua's Involvement In Xinjiang Surveillance on Nov 28, 2018
IPVM adds new details about Dahua’s activities in Xinjiang, a Chinese region where mass surveillance used to facilitate grave human rights...

Most Recent Industry Reports

From The Basement To Buried Behind Chinatown: ISC West Emerging Technology Zone on Feb 22, 2019
What does ISC West think about 'Emerging Technology'? Well, last year, they put those companies in the basement. This year, they moved them up to...
Private School IT Manager Surveillance Interview on Feb 22, 2019
This IT manager describes himself as the "oft-maligned IT person" whose "opinions may not always be appreciated by the integrator crowd." But he is...
Outdoor Camera Mounting Hardware Guide on Feb 21, 2019
Mounting cameras outdoors can be challenging, requiring understanding different types of equipment and methods. In this guide, we teach this...
HID Favorability Results 2019 on Feb 21, 2019
HID favorability results were strong, in the 2019 IPVM integrator study of 200+ integrators, with a net +62% and low negativity as the table below...
First US State, Vermont, Bans Dahua and Hikvision on Feb 21, 2019
The first US state, Vermont, has issued a ban on a number of Chinese and Russian manufacturers including the world's 2 largest video surveillance...
ADI 'SAVE BIG' On FLIR And Hikvision Examined on Feb 20, 2019
One is a major US defense supplier. The other is owned by the Chinese government. But you can "SAVE BIG" on both at ADI. In this note, we...
BluB0x Company Profile on Feb 20, 2019
BluB0x has doubled in revenue every year since its founding in 2013, according to CEO Patrick Barry. We originally reported on them in 2015. At the...
Massive Leak Of Chinese VMS Provider Exposes Xinjiang Surveillance on Feb 20, 2019
A subsidiary of China’s claimed largest VMS provider is tracking the precise location and ethnicity of millions in China’s Xinjiang region,...
Security Installation Tools Guide - 22 Tools Listed on Feb 19, 2019
In this guide, we cover 22 tools that security installers frequently use. This is one part of our upcoming Video Surveillance...
Sales Cuts At Rasilient on Feb 19, 2019
Over the past 2 years, video surveillance storage specialist Rasilient has expanded its workforce significantly, aiming to build its own branded...

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