Acoustics help blind people see the world

The EU-funded CASBLiP project was conceived to integrate the image processing and acoustic mapping technologies into a single, portable device that could be worn by blind people and help them to navigate outdoors.

The University of Laguna worked to adapt its acoustic mapping system and the University of Bristol refined its image processing algorithms. The device also incorporates a gyroscopic sensor developed by the University of Marche, Italy. This component, called the head-positioning sensor, detects how the wearer moves his head. It feeds back the position of the head and the direction it is facing, so that the relative position of the sounds being played to the wearer also move as expected. For example, if you turn your head towards a sound on the right, the sound must move left towards the centre of the sound picture.

Vision for the future

After three years, the consortium has produced two prototype devices mounted on a helmet. They have been tested successfully in trials by blind people in several real-world environments, including busy streets. Two blind institutions (the German Federation of the Blind and Partially Sighted and the Francesco Cavazza Institute, Italy) were heavily involved in the testing programme.

The first design (M1) uses a laser sensor developed by Siemens and originally intended to detect passengers in cars. It can calculate the distance to objects within 0 to 5m in a 60º field of view. The system is mounted inside glasses and cannot be seen by others because it uses infrared light. The M1 has been extensively tested by blind users who are able to recognise items, such as chairs and trees, from the sound picture they receive.

A second version (M2) adds two digital video cameras to either side of a helmet. It can detect moving objects and predict their path.

The University of Marche has also worked closely with the Cavazza Institute to build a complementary GPS location system. This technology could be used to pinpoint the location of a blind person and integrate the device with additional data sources, such as mapping services. It could provide the wearer with verbal directions to their destination.

"We know that the technology works," says Guillermo Peris-Fajarnés, who coordinated the project from the Research Group on Graphic Technologies at the Universidad Politecnica de Valencia. "Our tests have been very successful and blind people have been able to navigate comfortably in controlled tests and even along a normal street."

"There is still a lot of development work to do before this could go on the market, especially to prove that the system is 100% reliable," Peris-Fajarnés notes. "You can't risk it going wrong while a user is crossing the road."

He says the consortium has decided to continue work on this aspect beyond the end of the EU funding period.

Nevertheless, Peris-Fajarnés is confident that the device could be commercialised: "We are now looking for manufacturing partners to explore the possibilities for a commercially viable product. There's no other system like this available and it should complement existing aids, such as the white stick. But its commercial success will depend on miniaturising the system and mounting the cameras onto glasses."

"In my personal opinion, anything that can offer some more autonomy to the blind person is positive," said one tester.

CASBLiP received funding from the ICT strand of the EU's Sixth Framework Programme for research.