Have you also recognized that new cameras tend to appear, one after the another – not just on highways but even in nice suburban areas? Is it something that should worry you – or the key to a safer and more convenient everyday life? We all have different views about that.
There are undoubtedly more and more cameras around us. And yes, nobody likes to be under surveillance for sure. However, to have the whole picture, we should see beyond the optics. That’s what we intend to do in this article. We’ll be focusing on the concerns related to Automatic License Plate Recognition (ALPR, also known as ANPR) and sharing our thoughts from a developer’s/manufacturer’s point of view. By the end of our article, you will have a better understanding of why we need these devices, how they work, and how they affect your life.
What Makes a Camera a License Plate Camera?
First off, let’s see how a license plate camera works. It’s an imaging device, capturing passing vehicles or parts of them – like their front or the back, but especially the plates. They then forward the images to a central server. The system, including a so-called ALPR software, detects the license plate, recognizes its characters, and transforms them into digital alphanumeric data.
The software saves the information to a database or uses it for opening a barrier or gate, after verifying the license plate number. Some of these systems are governmental, while others are purely for commercial (or even private) use.
If You See a License Plate Camera, Here’s What It Does
Don’t let the view of a camera misle you: their application area is relatively wide. One can use the same camera for entirely different purposes. The following list will show some typical locations where you often come across CCTV / license plate cameras:
- Cameras at private driveways or corporate areas: most likely these devices are connected to automated barrier/gate opening systems. Their purpose is to achieve higher convenience – and security, keeping track of all vehicles entering and exiting the area.
- Cameras pointing to streets or junction points: it can be for multiple purposes. These include general CCTV security and the surveillance of embassies or other high-security buildings such as various governmental facilities. It’s also possible that the traffic flow is monitored and data is used for traffic optimization management.
- Cameras at the entries of gated communities: using automatic license plate recognition data, the entry/exit management is automated – or the guests and temporarily visiting vehicles are monitored (like FedEx, USPS, and Amazon couriers) in the so-called watchguard lanes.
As you see, the application area of ALPR cameras is huge – and various organizations may use/own such devices. This is also one of the reasons why people – possibly, even you – have concerns regarding these devices. So, we collected those typical doubts encompassing ALPR that make this topic controversial.
(Your) Concerns Related to ALPR Cameras
Are you familiar with automatic license plate recognition? Either yes or no, we can agree that this topic is quite controversial. An article at eff.org includes several of the concerns that frequently come up.
For example, people worry about their license plate data being available to governmental bodies. They are afraid that they may end up as scapegoats for something they have nothing to do with. Quoting the article:
“People imagine that if a crime is committed, an association member can hand over to police the license plate numbers of everyone that drove past a camera around the time the crime is believed to have been committed. But this will lead to innocent people becoming suspects because they happened to drive through a specific neighborhood. For some communities, this might mean hundreds of cars end up under suspicion.“
Another doubt, related to automatic number plate recognition is that these systems are not 100% reliable. And inaccurately recognized plates may lead to potential issues:
“Like all machines, ALPRs make mistakes. And these mistakes can endanger people’s lives and physical safety. For example, an ALPR might erroneously conclude that a passing car’s license plate matches the plate of a car on a hotlist of stolen cars. This can lead police to stop the car and detain the motorists. As we know, these encounters can turn violent or even deadly […]“
Moreover, the article goes on and state that having such kind of data collection does not affect actual crime rates:
“[…] the assumption that surveillance will reduce crime by either making would-be criminals aware of the surveillance in hopes it will be a deterrent or by using the technology to secure convictions of people that have allegedly committed crimes in the neighborhood. However, there is little empirical evidence that such surveillance reduces crime.”
We completely understand these concerns and do not dispute that the mentioned negative opinions are based on real personal experiences. We just would like to provide some explanation and important details that may prevent any kind of fake news on this topic.
As with every modern technology, most people need time to accept ALPR. In other words, we have to see the real benefits such systems provide. Regrettably, if any unfortunate events happen due to the malfunction of these devices – it will only lower their judgment.
However, we feel that the mentioned article does not show the whole picture. It only focuses on some negative opinions and denigrates a valuable technology developed by companies like us, Adaptive Recognition, entirely with the best of our convictions, to make the world a safer – and a better place. This is why it makes sense to walk around this topic and shed another light on the technology that has been part of our lives – for three decades (!) now.
How We See ALPR
1. ALPR Can Indeed Make Errors (If Not the Right Technology Is Used, or Not in the Right Way)
Though AI is hot and trendy, seeming to be super-efficient, not all of these technologies are perfect. The accuracy rate of plate reading and the detection of vehicles are performed on quite different levels by the available products.
Make sure to use only such technology that experts have thoroughly tested before applying it in any live project. How does it work in… bad weather, and low light conditions, how does it handle damaged plates, etc.?
We do not have information about the quality of products used in the example above. However, at Adaptive Recognition, our goal is to help our customers achieve the best possible results and guide them towards reliable system operation – in some projects, even above 99% recognition rate.
However, even if the technology is reliable, using it mistakenly is still possible – producing questionable results. The more complex the system is, the more aspects you need to consider: is the camera angle correct? Does it have enough FPS rates? Does the camera stream have over-exposure? So many factors that we cannot check in the specific example. Still, you have to consider all of these, in every project.
Buy your system only from such a company that can guide you towards reliable operation and gives expert assistance. And always, always: test twice.
2. “ALPR Does Not Reduce Crime” – On the Contrary!
Numbers never lie – statistics is our friend.
Sometimes even the sight of a camera is enough for burglars to turn away from their plans, but of course, the effect of these devices is more diverse.
It may sound trivial, but makes sense to emphasize that an image, captured at the right moment may be justificatory evidence during a case. Using such technology, judicial bodies can complete cases quickly and with greater confidence. Just to mention an example, in a South African suburban area, our license plate recognition software solved the case and helped authorities identify a group of burglars.
Of course, one example won’t prove anything. This is why we go further and present some of the relevant statistics, too.
“A study of 422 burglars found that security cameras were the most effective deterrent to burglars. 60% of the burglars said that they would pick a different target if they knew that a building or site had security cameras, and if they didn’t know ahead of time then 50% said that discovering surveillance cameras would cause them to abort the burglary.“
Source: Datanet IT
“Overall, 24.8 percent of matters where the footage was requested were solved by police, compared with 21.0 percent of matters where the footage was not requested—an 18 percent increase in clearance rates. The footage was provided to police for nine out of 10 requests and was associated with an estimated 20 percent increase in clearance rates.“
Source: Anthony Morgan / Australian Institute of Criminology
There’s even more than the reduction of crime rate – as automatic license plate recognition cameras take effect on the number of accidents, too. License plate cameras oftentimes come with speed measurement and it’s a proven fact that such enforcement contributes to making our roads safer. The following statistics are from an extensive study, written at the London School of Economics:
“[…] speed cameras unambiguously reduce both the counts and severity of collisions. After installing a camera, the number of accidents and minor injuries fell by 17%-39% and 17%-38%, which amounts to 0.89-2.36 and 1.19-2.87 per kilometer. As for the seriousness of the crashes, the number of fatalities and serious injuries decreased by 0.08- 0.19 and 0.25-0.58 per kilometer compared to pre-installation levels, which represents a drop of 58%-68% and 28%-55% respectively.”
Source: Do speed cameras save lives? by Cheng Keat Tang / London School of Economics / Spatial Economics Research Centre (SERC)
3. Having Your License Plate Captured Doesn’t Mean You’re in Trouble
It does not necessarily make you a suspect if you are driving close to a crime scene. Police operations are much more complex than that, their assumptions are not as simple.
Think about it: there was a murder near a high-traffic road with a couple of hundreds of vehicles passing by every hour. Believe me, they will not be put automatically on the suspects’ list just because they were near. For being a suspect, several factors should match, not only being nearby.
Based on the lines we quoted above, it’s also possible that somebody wanted to malign the technology that offers real benefits, as we pointed out.
Closing up
License plate recognition, of course, is a much, much wider topic. In this article, we focused mainly on local neighborhoods, but ALPR offers several benefits elsewhere, too. For example, connecting it to speed measurement systems efficiently decreases the accident rate. In-vehicle access control systems ensure a smooth drive-in experience, without the need for any manual supervision – offering even touchless workflow, which, especially now in the time of COVID, is a must-have feature.
Border control systems use ALPR as well, but it also aids in modernizing road toll control systems, and so on. To learn more about these projects, take a look at these case studies.
How you feel about ALPR, is still completely up to you, but we hope that this article helps you get some insights into the technology’s advantages and dissipate some of your concerns. We’re even providing you with downloadable, free LPR software for testing purposes.
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