Sign Language Synthesis

Sign language synthesis is the automated generation of sign language output, typically through 3D animated avatars or computer graphics, from text or other input. The technology involves translating written or spoken language into the grammar, vocabulary, and spatial expressions of a target sign language, then rendering the signs as visual animations including hand shapes, movements, facial expressions, and body posture. Sign language synthesis is important for deaf accessibility because many deaf people whose primary language is sign language may have limited fluency in written text, making captions and text alternatives insufficient. Key challenges include the grammatical differences between signed and written languages (sign languages have their own syntax, not a word-for-word mapping from spoken language), the need for natural-looking motion, and the language-specificity of sign languages — each country or region typically has its own sign language that must be supported independently.