Glossary

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Indoor Localization(also: Indoor Positioning, Indoor Positioning System, IPS)

The problem of determining the precise location of a person or device inside a building, where GPS signals are weak or unavailable. Indoor localization is foundational for accessible wayfinding systems aimed at blind and low-vision travellers, who need to know their position…

Inertial Sensing(also: IMU sensing, Inertial measurement)

The use of accelerometers, gyroscopes, and magnetometers — often built into smartphones and wearable devices — to measure motion, orientation, and direction of movement. In accessibility applications, inertial sensing enables dead reckoning for indoor navigation where GPS is…

Infrared(also: IR, Infrared Communication)

A wireless communication technology that uses infrared light to transmit data over short distances, commonly used in assistive technology for line-of-sight data exchange between devices. In accessibility applications, infrared transmission has been used in systems like Talking…

Infrared Beacon(also: IR Beacon, IR Tag)

A device that transmits identification signals using infrared light, used in indoor navigation and wayfinding systems to help locate users within buildings. When a user's receiver detects the beacon's signal, the system can determine the user's position relative to known…

Intersection Detection(also: Junction detection, Corridor intersection recognition)

A computer-vision or sensor-fusion technique used in indoor navigation systems for blind travellers to identify where two or more walkable corridors meet, so the navigation software can update the user's position on a map and issue a turn instruction at the right moment.…

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