Glossary

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Data Glove(also: digital glove, sensor glove, wired glove)

A wearable input device equipped with sensors to capture hand and finger movements, positions, and orientations. Data gloves use technologies like gyroscopes, accelerometers, flex sensors, or fiber optics to track hand gestures. In accessibility, data gloves enable sign language…

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…

Isolated Sign Language Recognition(also: isolated SLR, word-level sign recognition)

A sign language recognition task that focuses on identifying individual, pre-segmented signs rather than continuous signing sequences. In isolated SLR, each sign is captured as a separate video clip with clear start and end points, simplifying the recognition problem compared to…

Multimodal Features(also: multimodal data, multimodal fusion)

Information extracted from multiple sensory channels or data types—such as combining visual (RGB), depth, audio, and skeletal data—to improve recognition accuracy. In accessibility systems, multimodal approaches often outperform single-modality methods because different data…

Search-by-Video(also: Video-based search, Search by video)

A sign-language dictionary search technique in which a user performs a sign into a webcam or camera and computer-vision-based sign recognition returns a ranked list of candidate dictionary entries. Search-by-video is easier for novice signers than search-by-feature because it…

Sign Language Classifier(also: Classifier Sign, Depicting Sign, Classifier Predicate)

A type of sign in sign languages that is not part of a fixed vocabulary but is created dynamically during discourse to represent a class of objects sharing a common shape, size, or physical characteristic. Classifiers function as "super-pronouns" — they replace and describe…

Sign Phoneme(also: cheremes, sign language phoneme)

The smallest contrastive units in sign language that bear meaning and distinguish one sign from another, analogous to phonemes in spoken language. Sign phonemes include hand shapes, movements, locations, and orientations that combine to form signs. In sign language recognition…

Sign Spotting(also: Sign Detection, Continuous Sign Spotting)

Sign spotting is the task of automatically locating instances of specific signs within a continuous signing video, as opposed to classifying a pre-segmented isolated sign. It is a building block for search-by-sign in archive footage, automatic captioning of signed media, and…

Signer-Independent Recognition(also: signer-independent SLR)

A sign language recognition approach designed to work with signers whose data was not included in the training set. Similar to speaker-independent speech recognition, signer-independent systems must handle variations in signing style, hand size, speed, and regional signing…

Skeleton Tracking(also: skeletal tracking, body tracking, pose estimation)

Technology that detects and tracks the positions of human body joints (such as head, shoulders, elbows, hands) in real-time from camera or depth sensor data. In accessibility applications, skeleton tracking enables gesture-based interfaces, sign language recognition, and…

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