Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Hidden Markov Model(also: HMM)
- A statistical model used extensively in pattern recognition where the system being modeled is assumed to follow a Markov process with hidden (unobserved) states. HMMs have been foundational in both automatic speech recognition and sign language recognition, as they can model…
- Histogram of Oriented Gradients(also: HOG)
- A feature descriptor technique used in computer vision for object detection that counts occurrences of gradient orientations in localized portions of an image. HOG captures edge and texture information by dividing the image into cells and computing gradient direction histograms.…
- Human Activity Recognition(also: HAR, Activity Recognition)
- A field of machine learning and ubiquitous computing that uses sensor data — typically from accelerometers, gyroscopes, and other sensors in smartphones, smartwatches, or other wearable devices — to automatically identify and classify physical activities performed by a person.…
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