AI that finds people in time

Artificial Intelligence built on world leading research

VSL – The Next Generation AI Platform

​VSL is the leading AI Deep Learning team focused on computer vision machine learning . VSL has developed video analysis and dynamic scene understanding software that is targeted at the public safety & smart city sectors - a large and expanding attractive market. 

In solving the most complex Deep Learning AI computer vision problems, VSL has developed a unique approach to Decentralised Machine Learning, the next generation AI platform, based on a dynamic lifelong learning AI model to “search and learn”.

Today, AI is based on big centralized data “learn and forget” algorithm models with limited data privacy, large computing processing power, and big power consumption. The edge is the next stage of the evolution of AI technology because of the physical constraints, the cost constraints, and the practical constraints of running all AI applications in the cloud.  VSL’s approach, perfected in computer vision, enables it to deliver the next generation AI platform, more advanced than Google Federated Learning. 

It’s the future platform for AI with multiple sector applications.

Artificial Intelligence Products Built on

World-Class Research

VSL began life as a spin out from Queen Mary University of London Computer Vision Department, led by founder Professor Sean Gong. The team has been conducting world-class research in computer vision and machine learning for over 20 years, internationally renowned for its work on unusual behaviour recognition, person re-identification, multi-camera tracking, and face analysis in video and images. This research has led to over 400 published papers, over 27,000 citations and filing of 9 families of international patents, with 34 underlying patents, providing barriers to competitors exploiting computer vision commercially.

The main areas of application include but are not limited to person re-identification, face recognition, action and behaviour analysis, expression and emotion recognition, gait recognition, attribute recognition, clothing analysis, image and video super-resolution, crowd analysis and counting, vehicle analysis, video summarisation, smart camera networks, multi-camera target detection and tracking, airborne drone object recognition, action and object recognition on wearable devices, privacy by design image analysis, and gaze analysis by eye-movement tracking. 

Deep learning neutral networks which transform the outcomes of computer vision analysis 

VSL has developed world-class video analysis and dynamic scene understanding software that employs innovative computer vision and machine learning methods focused on deep learning. It has developed a commercial grade software platform for patented automatic video analysis of vast quantities of CCTV video & images running up to 100X real-time.


In particular, VSL has developed Person Re-identification (or person RE-ID for short) the ability to find rapidly a person in time and space across a vast video network of cameras, even if there is no clear view of the face or lighting is dark, from multiple sources of video. VSL is unique in being able to find people within low resolution video footage.

AI Powered Person Re-Identification (RE-ID)


The video surveillance industry is experiencing a massive growth spurt as we increasingly use cameras to prevent crime, secure evidence, protect our property, and improve public safety in the home and at large.  However, data generated from digital surveillance cameras has become so massive that it is often impossible or commercially impractical for human operators to make sense out of it in a timely manner.

A major challenge is Person Re-Identification (RE-ID). That is the process to find a matching person (in a gallery of images) for a given image using not (just) facial features (which are often obscured) but features found on the entire body (like clothing, height, carried objects, etc).  Face recognition works only when the subject is close enough, well-lit and facing towards the camera. Usually in CCTV footage this is not the case, and an individual can deliberately cover their face from the camera.

How Does Re-ID Work?

VSL solutions provide the ability to search for people when

facial recognition is not feasible within any unstructured and

uncontrolled environments, indoors and outdoors, close-by and

far-away, day and night. VSL can rapidly find people in time,

with accuracy over large-scale crowded environments that public

safety agencies operate in, with the ability to handle low resolution

video data.

RE-ID applies a Zero-Shot learning approach, a process by

which a machine learns how to recognize objects in an image

without any labelled training data to help in the classification.

In other words, Zero-Shot learning aims to help machines

categorize objects or interactions that they have never seen before. This makes the solution scalable - it can deployed in cities internationally without data training.


VSL uniquely applies RE-ID to human-in-the-loop “search and learn” AI algorithms, bridging transfer learning, reinforcement learning, semi-supervised and unsupervised deep learning, to enable rapid and scalable RE-ID in unknown target domains from an open-set world.


VSL RE-ID software has grown beyond research lab PhD experimental code to become commercially mature and tested.  VSL RE-ID technology is underpinned by world-class RE-ID algorithms that have led the academic RE-ID benchmarking not only on supervised, but also on unsupervised and domain transfer testing, on both the largest benchmark Market-1501 and the hardest benchmark GRID. VSL has gone beyond market testing into making the technology scale for real commercial deployments.


VSL is the driving force in this market with a 12-18-month sustainable technology lead in RE-ID over the nearest competitor. The technology is backed by 9 international patent families with 34 underlying patents. This is combined with 10 years of commercial work with international Government and law enforcement agencies to ensure the technology is accurate, fast and scalable for real world deployments.


Capabilities and Roadmap

Today, RE-ID is applied to post event analysis where we search for a person in time and space over a network of CCTV cameras video footage. This capability is being enhanced by adding attribute search to RE-ID, so we can now search for a person with an object (bag, umbrella, etc.) and a vehicle (car, motor bike or bike).

Into this environment, VSL released Real Time RE-ID in 2020 and this transforms the capability of public safety to act in real time to trigger events picked up in video footage. If police and public safety officials can monitor and respond in real time, then a crime or social disturbance can be recognised and prevented.

VSL is currently working on a behaviour video analysis module which will work within the RE-ID framework. This will enable us to re-identify behaviours which serve as a trigger event to a predicted outcome.  The module facilitates abnormal behavior profiling and can then facilitate event alerting to either criminal or terrorist threat, identification of lost or self-harm passengers and group social distancing violations.  This will enable future automation of the process flow in protecting threats to the public.

© Copyright Vision Semantics Limited 2020. All rights reserved. Vision Semantics Limited, 327 Mile End Road, London, E1 4NS