Skip to content

Do you recognise me?

Share on facebook
Facebook
Share on twitter
Twitter
Share on linkedin
LinkedIn

By Julia Farrugia

Automatic facial recognition could change the world of law enforcement. Profile photos of suspects are rarely available, so investigators still rely on face sketches based on eyewitness descriptions. Julia Farrugia (supervised by Dr Ing. Reuben Farrugia) implemented an automatic face recogniser that is able to retrieve a photo based on a sketch. This narrows down the number of potential criminals before trails start to go cold.

Photos used with permission: X. Wang and X. Tang, “Face Photo-Sketch Synthesis and Recognition,” IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), Vol. 31, 2009
Photos used with permission: X. Wang and X. Tang, “Face Photo-Sketch Synthesis and Recognition,” IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), Vol. 31, 2009

Sketches and photos have different natures (modalities)—photos are generally captured using a digital camera, while sketches may be hand-drawn or computer generated. In order to tackle this problem, Farrugia developed an inter-modal approach to sketch retrieval. Without changing the nature (modality) of the images, common features in the sketch and photo were used as a basis for retrieval. Testing was carried out using the Chinese University of Hong Kong (CUHK) student database, which contains 188 photo-sketch pairs.

The implementation makes use of an Active Orientation Model (AOM), which is freely available. 68 strategic points on a query sketch and suspect photo are plotted. Dots depict features like eyebrows, hairline, and nose. The distance was calculated between the respective points on the sketch and photo. The smaller the difference in distances, the closer the match. 55.85% of tests resulted in a correct match between sketch and photo. To improve these results, texture features of the query sketch and each photo in the dataset were extracted using Local Binary Patterns (LBP). The distance was again calculated but included the texture features. The results were then merged with the distances obtained using the AOM method. Giving a higher priority to the distances obtained using the texture features increased the recognition rate to 60.11%.

Results could be improved by filtering the photos according to gender and by experimenting on larger datasets with subjects from different ethnicities, wearing glasses, or having facial hair. Advancements in computer vision means that soon humans will not be the only eyes narrowing down possible suspects.


This research was carried out as part of a Bachelor of Science in Computer Engineering at the Faculty of ICT, University of Malta.

More to explorer

Maltese Innovation Promises New Era in Accessing Space

A team of researchers and engineers from the University of Malta’s Astrionics Research Group (ASTREA) are developing their own satellite and ground station for Malta to take its place in the night sky above.

Cutting EDGE Research: the Genomes of Maltese Plants

Conservation is a 21st century hot topic. It is a top priority worldwide to ensure the lasting protection of the planet and its natural resources. But how can we even begin to conserve our natural environment if we don’t understand it? Ines Ventura investigates.

Impressions on Branding

Our impression of a brand shapes our experience of the product or service involved. Five students from the Bachelor of Fine Arts (BFA) in Digital Arts looked into this, involving their own interests in the medium.

No comment yet, add your voice below!


Add a Comment

Your email address will not be published.