{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:NMT3W7TNQBPCHRAXUDVN42LQXM","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":"39814fc8e16496e326414ccd1e09baa9025a0bf0a6b02af6fa117ff3541f4828","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2013-03-25T03:16:08Z","title_canon_sha256":"a64f2a0bf1b9f37f65afecf6a66029ef0b38a9ff39611860291368b71461386a"},"schema_version":"1.0","source":{"id":"1303.6021","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.6021","created_at":"2026-05-18T03:29:52Z"},{"alias_kind":"arxiv_version","alias_value":"1303.6021v1","created_at":"2026-05-18T03:29:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.6021","created_at":"2026-05-18T03:29:52Z"},{"alias_kind":"pith_short_12","alias_value":"NMT3W7TNQBPC","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NMT3W7TNQBPCHRAX","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NMT3W7TN","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:f1b1a59fe1055fdb916cfea1b32f6cc28a9f30d50fc66cb1124b2cc778a1dba3","target":"graph","created_at":"2026-05-18T03:29:52Z","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":"We propose a new action and gesture recognition method based on spatio-temporal covariance descriptors and a weighted Riemannian locality preserving projection approach that takes into account the curved space formed by the descriptors. The weighted projection is then exploited during boosting to create a final multiclass classification algorithm that employs the most useful spatio-temporal regions. We also show how the descriptors can be computed quickly through the use of integral video representations. Experiments on the UCF sport, CK+ facial expression and Cambridge hand gesture datasets i","authors_text":"Andres Sanin, Brian C. Lovell, Conrad Sanderson, Mehrtash T. Harandi","cross_cats":["cs.HC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2013-03-25T03:16:08Z","title":"Spatio-Temporal Covariance Descriptors for Action and Gesture Recognition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.6021","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":"sha256:457ccfdc25b51b409d626e4808a12ded3fa0d55efba09d3f4a47ae5808e51c92","target":"record","created_at":"2026-05-18T03:29:52Z","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":"39814fc8e16496e326414ccd1e09baa9025a0bf0a6b02af6fa117ff3541f4828","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2013-03-25T03:16:08Z","title_canon_sha256":"a64f2a0bf1b9f37f65afecf6a66029ef0b38a9ff39611860291368b71461386a"},"schema_version":"1.0","source":{"id":"1303.6021","kind":"arxiv","version":1}},"canonical_sha256":"6b27bb7e6d805e23c417a0eade6970bb2b9601095d808f31ec74405131a53ac3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6b27bb7e6d805e23c417a0eade6970bb2b9601095d808f31ec74405131a53ac3","first_computed_at":"2026-05-18T03:29:52.228150Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:29:52.228150Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M3frh1oz9acqPNbligAh38YjgxqG0WjStfBGsnTZZDixCxv9fQpFOhuCM0dE5W6ES1fiLZcPZwuKQEZUppEeAg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:29:52.230144Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.6021","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:457ccfdc25b51b409d626e4808a12ded3fa0d55efba09d3f4a47ae5808e51c92","sha256:f1b1a59fe1055fdb916cfea1b32f6cc28a9f30d50fc66cb1124b2cc778a1dba3"],"state_sha256":"d14decb161e04cb8780a72828b0067b480bd5b61599c2cfcb77b0c4507571e84"}