Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Mid-Air Gesture(also: In-Air Gesture, Free-Space Gesture)
- A hand or arm movement performed in three-dimensional space, away from any surface, that is recognized by sensors as a command input. Mid-air gestures can be detected using cameras, depth sensors, or inertial measurement units in wearable devices like smartwatches. In…
- Motion History Image(also: MHI)
- A computer vision technique that represents motion in video sequences as a single grayscale image, where pixel intensity indicates recency of movement. Brighter pixels represent more recent motion while darker pixels show older movement patterns. In accessibility applications,…
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