{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:WGA7DOYZIRUM3YM7IVMXWAFB54","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":"bada9a00e35896ab46823e556688c04a0b231d77216916770752fb66784af64d","cross_cats_sorted":["cs.HC"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.CV","submitted_at":"2021-11-18T15:21:33Z","title_canon_sha256":"8bc056278df1be7e8c9231156bc28693e9652df866b19669ac8ef0ba7a7ce8ea"},"schema_version":"1.0","source":{"id":"2111.09748","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.09748","created_at":"2026-07-05T03:33:15Z"},{"alias_kind":"arxiv_version","alias_value":"2111.09748v1","created_at":"2026-07-05T03:33:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.09748","created_at":"2026-07-05T03:33:15Z"},{"alias_kind":"pith_short_12","alias_value":"WGA7DOYZIRUM","created_at":"2026-07-05T03:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"WGA7DOYZIRUM3YM7","created_at":"2026-07-05T03:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"WGA7DOYZ","created_at":"2026-07-05T03:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:9943b5ef49c9a93d39d79459a143581b0873692e69e6ae1255a735ee9da22679","target":"graph","created_at":"2026-07-05T03:33:15Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2111.09748/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The ability to reliably estimate physiological signals from video is a powerful tool in low-cost, pre-clinical health monitoring. In this work we propose a new approach to remote photoplethysmography (rPPG) - the measurement of blood volume changes from observations of a person's face or skin. Similar to current state-of-the-art methods for rPPG, we apply neural networks to learn deep representations with invariance to nuisance image variation. In contrast to such methods, we employ a fully self-supervised training approach, which has no reliance on expensive ground truth physiological trainin","authors_text":"John Gideon, Simon Stent","cross_cats":["cs.HC"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.CV","submitted_at":"2021-11-18T15:21:33Z","title":"The Way to my Heart is through Contrastive Learning: Remote Photoplethysmography from Unlabelled Video"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.09748","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":"sha256:160cf7d44121755d70279e8f87cf55a3aa84f33bffd928c53e108da91df35453","target":"record","created_at":"2026-07-05T03:33:15Z","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":"bada9a00e35896ab46823e556688c04a0b231d77216916770752fb66784af64d","cross_cats_sorted":["cs.HC"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cs.CV","submitted_at":"2021-11-18T15:21:33Z","title_canon_sha256":"8bc056278df1be7e8c9231156bc28693e9652df866b19669ac8ef0ba7a7ce8ea"},"schema_version":"1.0","source":{"id":"2111.09748","kind":"arxiv","version":1}},"canonical_sha256":"b181f1bb194468cde19f45597b00a1ef3ebaa45b601cb00ec18ddb7263c66dee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b181f1bb194468cde19f45597b00a1ef3ebaa45b601cb00ec18ddb7263c66dee","first_computed_at":"2026-07-05T03:33:15.055728Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:33:15.055728Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l1ehRZrGlAzaQbjeJZ0R6EXFpA5pkmkryB1UG3crymYPGHwtOYTjOLlz6j6lqdw+Zvp/9g12TbPc65qLIsc6Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:33:15.056360Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.09748","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:160cf7d44121755d70279e8f87cf55a3aa84f33bffd928c53e108da91df35453","sha256:9943b5ef49c9a93d39d79459a143581b0873692e69e6ae1255a735ee9da22679"],"state_sha256":"dc5fc50818734d25fc30b0455aa02db78dc01346b7a2d27cf3f41a47b23d51d6"}