Billboards that change to display products relevant to the person walking past could soon be hitting a high street near you.

French company Quividi has developed software that works in conjunction with a tiny camera connected to the billboard to analyse facial features.

Information such as cheekbone height and the nose-to-chin distance is used to identify the gender and age of the person standing in front of the billboard. These details are then transmitted to a central database and cross -referenced to ensure the digital display is tailored to suit each person.

Quividi claims that because the actual images of the passers-by will not be stored, privacy laws are not violated.

"Everything we do is completely anonymous," Paolo Prandoni, Quividi's founder and chief scientific officer told