ALPR / NPR Recognition Accuracy and Issues

By: 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.

*******, ****** *** *** lowest ******* *** **** rate ** *** *****, according ** *** ******.

ALPR ******

******* **** ** **** more ****** **** ******** money ** ** *********** product. **** *** *** three **** ****** *********** in *** ******:

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

******* **** ******* ***** rely ** ************, ****** that *** ****, ***** or ******* “*** ***** the **** ******** ** misidentify * *********.”

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

**** *****, *** ******* and **** **** *** common ******** ************ **** can **** ** * misidentified ******* *****. ******** **** ******** * spoke ** **** *** hitches *** ********* **** have * ******* ****, and **** ******* **** SUV ****** **** **** just *** **** *******.

*** ****** ******** ***** examples ** ********** ******:


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

“**** ******, ********** ******* tones, *** ** ********* for **********[*] ** ****,” *** study ****. ** *****’* say *** *** ** does *** ***** ****** has * ***** ****** on *** **** ** ALPR ****** ** ***** to **** * *****. Not **** ** ***** designs **** **** ***** to ***** *** ****** a *****, *** ***** of *** ********** **** vary.

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

***** ****** **** *** impact *** ******** ** a **** *** ******* the ******* *** ****** or ***, *** ****** says, *** ** *****'* indicate ******* **** ** better ** ***** *** determining ***** *******. **** systems ****'* ********** ** read ****** **** ***** states. *** ****** **** not ******** ***** ***** are.

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

**** ** *.*. **** capture *** **** ***** is **** ** ****, but ***** *** *** lowest ********** *********** ***** for ******'********* ****** ******:

*.*. *** ************** ******* *** ******** ********* earlier, **** ***** ********* their ************. *** ********* from *** *****:

  • "********** ****** (**) ****** Department, *** *******, *** indicated **** * ****** officer ******** **** **** scanned **,*** ******, ********* in *** ******** ** 255 ******* *********, *** identification ** ** ******* with ********* ********, ** vehicle ******** *********, * stolen *** * ******* license ***** ****, *** 3 ******* ** *** course ** ** ***** of *** **** ** days."
  • ** **** **** ** scanning ** *** *.*. Mexico ****** *** *********** scanned ***,*** ****** *** “over *,*** **** ******** in * *******, ** rapes, ** *********, *** assaults, *** **********, *** vehicle ******, *** *******, and *** ********* *****.”

ALPR ****?

******-**** ******* ** *** agencies ***** **** **** it ****** *** **** theft. **** (** *******) reported ** ******** ** vehicle ********** *** ******* in **** ***** ***** after ******** ****. *** other **** ****** **** like **** ***********, ***** and **** ***** *********** and *********** ******* ****.


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

*** ****** ** ******** using **** ** ******* steadily ***** ****. ** the *** ******** ******** by *** ****, ** (23%) **** **** **** ALPR. * ******* ****** from **** ***** **** larger ******** **** ******** the ********** ** * faster ****. ** ***** larger ******** (**,*** ** more ********), ** ******* use ****.

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

**** ** ***. **** 48 ******* ******** *** any ******* ******** *** ALPR ***.

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

****** ** ******* ** the ******** ******** ***** the **** *** *** months, ** ******* ***** it ************. ****** **** (43 *******) ******* ***** “hot *****” *****.

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

The Scheme Hikvision and China Importers Use To Avoid Tariffs on Jun 17, 2019
Hikvision and numerous China importers are avoiding 25% tariffs by including an SD card slot in their IP cameras to claim they are 'digital still...
Embattled $400 Million China Funded Philippines Surveillance System Proceeds on Jun 13, 2019
An embattled 12,000 camera surveillance system project that will cost ~$400 million will proceed.  The project contract was awarded, had its...
Nortek and SDS Fight Over Failed Settlement on Jun 05, 2019
Distributor SDS said they reached a deal with Nortek but Nortek says no settlement was reached and the suit is still on. In this post, based on...
China Jaywalking Facial Recognition Guide on May 27, 2019
News reports touting the PRC's AI prowess often showcase facial recognition cameras being used to automatically catch and fine jaywalkers.  In...
Kidnapping Victim Rescued With Video From Ring Doorbell Camera on May 24, 2019
A kidnapping victim was rescued within 24 hours, with the police crediting video from a Ring Doorbell camera as key to solving the case. A girl was...
NJ Law Requires Apprenticeship For Public Works Integrators on May 24, 2019
Few integrators do a formal apprenticeship program. However, now a NJ law is requiring any integrator on public works projects (such as state...
Amazon Ring Public Subsidy Program Aims To Dominate Residential Security on May 20, 2019
Amazon dominates market after market. Quitely, but increasingly, they are doing so in residential security, through a combination of significant...
Bank Security Manager Interview on May 15, 2019
Bank security contends with many significant threats - from fraudsters to robbers and more. In this interview, IPVM spoke with bank security...
China PRC Government New National Video Surveillance Standards on May 14, 2019
The People's Republic of China (PRC) government has released a new set of overarching standards for authorities to follow when they install video...
ADT's Top Dealer "The Defenders" Sued 20+ Times on May 07, 2019
ADT's largest authorized dealer, The Defenders, has been sued more than 20 times since 2012, IPVM has verified through analyzing legal...

Most Recent Industry Reports

Repositionable Multi-Imager Camera Shootout - Avigilon, Axis, Dahua, Hanwha, Hikvision, Panasonic, Vivotek on Jun 19, 2019
Repositionable multi-imager cameras are one of the fastest growing segments in video surveillance, with a slew of new offerings being recently...
Genetec Synergis Cloud Link - Complex, Costly and Confusing on Jun 18, 2019
Genetec's Synergis Cloud Link is complex, costly and confusing compared to competitor access control architectures. Inside this note, we examine...
Startup Vaion Launching End-to-End AI Solution Backed with $20 Million Funding on Jun 17, 2019
An EU / USA video surveillance startup, Vaion, founded by ex-Cisco Senior Directors is launching an end-to-end VSaaS platform with $20 million in...
Biometrics Usage Statistics 2019 on Jun 17, 2019
While face and fingerprint recognition are used regularly for smartphones, it is not as common in physical security. In this note, we examine...
The Scheme Hikvision and China Importers Use To Avoid Tariffs on Jun 17, 2019
Hikvision and numerous China importers are avoiding 25% tariffs by including an SD card slot in their IP cameras to claim they are 'digital still...
Sighthound Transforms Into Enterprise AI Provider Profile on Jun 14, 2019
Sighthound is now rapidly expanding its R&D team, building an enterprise AI service. This may come as a surprise given their origins 6 years...
ADT Eliminating Acquired Brands, Unifying Under 'Commercial' Brand on Jun 14, 2019
ADT is eliminating the brands of the many integrators it has acquired over the past few years, including Red Hawk, Aronson Security Group (ASG),...
NSA Director Keynoting Dahua and Hikvision Sponsored Cybersecurity Conference [Canceled] on Jun 13, 2019
The technical director for the NSA’s Cybersecurity Threat Operations Center will be keynoting a physical security cybersecurity conference that is...
Farpointe Data Conekt Mobile Access Reader Tested on Jun 13, 2019
California based Farpointe Data has been a significant OEM supplier of conventional access readers for years to companies including DMP, RS2, DSX,...
Embattled $400 Million China Funded Philippines Surveillance System Proceeds on Jun 13, 2019
An embattled 12,000 camera surveillance system project that will cost ~$400 million will proceed.  The project contract was awarded, had its...

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