Zero-Shot Cross-Lingual Recognition of Sign Language Handshapes
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Computer Science > Computation and Language
arXiv:2609.18772 (cs)
[Submitted on 16 Sep 2026]
Title:Zero-Shot Cross-Lingual Recognition of Sign Language Handshapes
Authors:Marcel Granero-Moya, Carolina del Corral Farrarós, Gloria Haro, Coloma Ballester, Ricardo Marques
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Abstract:Sign language processing advances rapidly for high-resource languages such as American Sign Language (ASL), yet most of the world's sign languages lack the phonological annotations new methods require. We present the first zero-shot cross-lingual framework for handshape recognition, transferring from ASL to Catalan Sign Language (LSC). Our approach leverages the decomposition of handshapes into five phonological features -- selected fingers, flexion, spread, thumb position, and thumb contact -- shared across both languages, to decode LSC handshapes from predicted features via a composite phonological distance metric. We evaluate three architectures (MLP, SL-GCN, SHuBERT) trained on two ASL corpora (PopSign, Sem-Lex) against a 37-handshape, single-signer LSC benchmark. Zero-shot transfer proves viable once recording-format disparities are harmonized, reaching 80.0% phonological feature accuracy and 54.5% expected handshape accuracy. Phonological decomposition thus offers a bridge for extending sign language technologies to low-resource languages without any target-language video training labels.
| Comments: | Accepted at the Workshop on Sign Language Processing (WSLP), EMNLP 2026 |
| Subjects: | Computation and Language (cs.CL); Computer Vision and Pattern Recognition (cs.CV) |
| Cite as: | arXiv:2609.18772 [cs.CL] |
| (or arXiv:2609.18772v1 [cs.CL] for this version) | |
| https://doi.org/10.48550/arXiv.2609.18772
arXiv-issued DOI via DataCite (pending registration)
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Submission history
From: Marcel Granero-Moya [view email][v1] Wed, 16 Sep 2026 14:56:51 UTC (44 KB)
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View a PDF of the paper titled Zero-Shot Cross-Lingual Recognition of Sign Language Handshapes, by Marcel Granero-Moya and 4 other authors
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