{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PPDL27KQTTQIOHHOYJY5IQNSYA","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"486cf2498c44be6c3613dae753cce6073ac9acf454bf4a34e748156dac1478ad","cross_cats_sorted":["cs.HC","cs.NE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-05-20T07:10:49Z","title_canon_sha256":"c0bd8755c6999e02584a3a0117bdc43ba42bd37aa7c7526ce0c48c8c9ed60313"},"schema_version":"1.0","source":{"id":"1905.07917","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.07917","created_at":"2026-05-17T23:45:48Z"},{"alias_kind":"arxiv_version","alias_value":"1905.07917v1","created_at":"2026-05-17T23:45:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.07917","created_at":"2026-05-17T23:45:48Z"},{"alias_kind":"pith_short_12","alias_value":"PPDL27KQTTQI","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PPDL27KQTTQIOHHO","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PPDL27KQ","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:1d0167eadcb5ea5aac2279bfa907f254256aa641a4fc8563d24207835daa2239","target":"graph","created_at":"2026-05-17T23:45:48Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this paper, we propose a new hand gesture recognition method based on skeletal data by learning SPD matrices with neural networks. We model the hand skeleton as a graph and introduce a neural network for SPD matrix learning, taking as input the 3D coordinates of hand joints. The proposed network is based on two newly designed layers that transform a set of SPD matrices into a SPD matrix. For gesture recognition, we train a linear SVM classifier using features extracted from our network. Experimental results on a challenging dataset (Dynamic Hand Gesture dataset from the SHREC 2017 3D Shape ","authors_text":"Luc Brun, Olivier Lezoray, S\\'ebastien Bougleux, Xuan Nguyen","cross_cats":["cs.HC","cs.NE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-05-20T07:10:49Z","title":"Skeleton-Based Hand Gesture Recognition by Learning SPD Matrices with Neural Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.07917","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8a453fa5a5331fa429437d93831ce30d29265ea820ee06c8fa91f5e4f7143c1b","target":"record","created_at":"2026-05-17T23:45:48Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"486cf2498c44be6c3613dae753cce6073ac9acf454bf4a34e748156dac1478ad","cross_cats_sorted":["cs.HC","cs.NE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-05-20T07:10:49Z","title_canon_sha256":"c0bd8755c6999e02584a3a0117bdc43ba42bd37aa7c7526ce0c48c8c9ed60313"},"schema_version":"1.0","source":{"id":"1905.07917","kind":"arxiv","version":1}},"canonical_sha256":"7bc6bd7d509ce0871ceec271d441b2c023fefdcfb5d4c9df92590dfe2adbd579","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7bc6bd7d509ce0871ceec271d441b2c023fefdcfb5d4c9df92590dfe2adbd579","first_computed_at":"2026-05-17T23:45:48.105534Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:45:48.105534Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QqDu6q9LYrKaV4/G/bhkbAhKl9myEINrPA593EgxjFJY3t9wyxhlZoC8Bf8bBdakehdzYyEWv12z/YL3cauZCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:45:48.106172Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.07917","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8a453fa5a5331fa429437d93831ce30d29265ea820ee06c8fa91f5e4f7143c1b","sha256:1d0167eadcb5ea5aac2279bfa907f254256aa641a4fc8563d24207835daa2239"],"state_sha256":"85832f92fcf8e4d9787b488637095abdc84c3d2f94b2bd507408c794fcc711a6"}