Facial recognition software is what makes it possible for devices to recognise faces. Put simply, facial recognition systems create ‘maps’ of people’s features from scanning a photo or video. They then perform verification or identification by matching against a database of stored facial images.
This software is used across various aspects of our lives, from unlocking your personal mobile phone using facial recognition, to more advanced cases such as locating missing persons. This biometric technology is helping to create safer societies but is often not fully understood.
In essence, facial recognition software learns what’s unique about your face so that it can find it again. Some systems are more advanced than others, but most involve these four stages:
The use of live facial recognition (LFR) varies between forces. For example, it can be used to identify individuals on their known ‘watch list’ using real-time CCTV. It can also help officers to compare crime scene stills with those in their custody systems. In other forces, it’s used to tackle specific types of crime, like gun violence.
LFR has proven a useful tool for officers. It can match up to three million images per second, narrowing a search in a way that can’t be done manually. Yet it’s not without its critics. Privacy is still an issue, although many systems will auto-delete unused data. Older algorithms can fall short on accuracy too, struggling with gender and race. The US National Institute of Science and Technology publishes annual ratings to help compare the performance of different systems. It’s a welcome development, given how quickly new vendors are joining the market.
LFR is already in use by governments and industry in every region. Here’s just a few examples of how this technology is changing our lives:
Looking ahead, the software has huge potential. It already helps to find missing persons or suspects in a crisis. AI is constantly improving, to the point where it’s not fooled by hats, sunglasses, or face coverings. Potential data sources – like smartphones and body-worn cameras – are growing each day. And it can help confirm identity without physical contact.
But its success will depend on keeping the faith of the public. So, we need to strike the right balance between safety and privacy. Firstly, by taking active steps to reduce bias and by only choosing to deploy technologies developed by responsible suppliers. Secondly, by making sure that its use is proportionate. And lastly, by being clear about where we’re using it and why.
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