{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:L76O6E7WHCPP4J6ZHPC6AJKQP7","short_pith_number":"pith:L76O6E7W","canonical_record":{"source":{"id":"1502.08040","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-02-27T20:03:06Z","cross_cats_sorted":[],"title_canon_sha256":"39f4acfba176caf14b6027dfa2b7cac3c91445046b1e5eed904382bb6eadf90b","abstract_canon_sha256":"2d8079ea93d5d0d7a405a8be094c352d57449587b7a198ed027bfea5930fea40"},"schema_version":"1.0"},"canonical_sha256":"5ffcef13f6389efe27d93bc5e025507fcf57a3a46cf2240e46f93379da873a2a","source":{"kind":"arxiv","id":"1502.08040","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.08040","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"arxiv_version","alias_value":"1502.08040v2","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.08040","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"pith_short_12","alias_value":"L76O6E7WHCPP","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"L76O6E7WHCPP4J6Z","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"L76O6E7W","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:L76O6E7WHCPP4J6ZHPC6AJKQP7","target":"record","payload":{"canonical_record":{"source":{"id":"1502.08040","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-02-27T20:03:06Z","cross_cats_sorted":[],"title_canon_sha256":"39f4acfba176caf14b6027dfa2b7cac3c91445046b1e5eed904382bb6eadf90b","abstract_canon_sha256":"2d8079ea93d5d0d7a405a8be094c352d57449587b7a198ed027bfea5930fea40"},"schema_version":"1.0"},"canonical_sha256":"5ffcef13f6389efe27d93bc5e025507fcf57a3a46cf2240e46f93379da873a2a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:20:30.082175Z","signature_b64":"SyrrZP5H8VqzfQYeSkKDhwGZJ1zx4SNEYKTreM8Qpfjxc26ddRcNzxKFgDYKNzlMzQCbvL/Qfqrv53L3igD8BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5ffcef13f6389efe27d93bc5e025507fcf57a3a46cf2240e46f93379da873a2a","last_reissued_at":"2026-05-18T02:20:30.081775Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:20:30.081775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.08040","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:20:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WxCWkkIxmkwYCapgXE/JdLUDGGUN/udqdKJVNQrUtvWzFjJUrUaM3BUKdbcGSL2GwQBbat7v7abSbLmP1xKzBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:31:48.371332Z"},"content_sha256":"b7218d9e157f3f4587d665940324084317f1c4aec814a1017cc1ee500531b5e5","schema_version":"1.0","event_id":"sha256:b7218d9e157f3f4587d665940324084317f1c4aec814a1017cc1ee500531b5e5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:L76O6E7WHCPP4J6ZHPC6AJKQP7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"DistancePPG: Robust non-contact vital signs monitoring using a camera","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Ashok Veeraraghavan, Ashutosh Sabharval, Mayank Kumar","submitted_at":"2015-02-27T20:03:06Z","abstract_excerpt":"Vital signs such as pulse rate and breathing rate are currently measured using contact probes. But, non-contact methods for measuring vital signs are desirable both in hospital settings (e.g. in NICU) and for ubiquitous in-situ health tracking (e.g. on mobile phone and computers with webcams). Recently, camera-based non-contact vital sign monitoring have been shown to be feasible. However, camera-based vital sign monitoring is challenging for people with darker skin tone, under low lighting conditions, and/or during movement of an individual in front of the camera. In this paper, we propose di"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.08040","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:20:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W02GY2FQX1gMKDc6GF98fMNlZ5wvMmKyHtNSSKu1uDWMRnKmazsg9iuEPsduecGb0+Wj5tJs/rO9phyAZO0kCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:31:48.371678Z"},"content_sha256":"78db6300849a4b78a1fa1eb372644c9d44d54e6b6489f56fa783f89356d24301","schema_version":"1.0","event_id":"sha256:78db6300849a4b78a1fa1eb372644c9d44d54e6b6489f56fa783f89356d24301"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/bundle.json","state_url":"https://pith.science/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-28T14:31:48Z","links":{"resolver":"https://pith.science/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7","bundle":"https://pith.science/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/bundle.json","state":"https://pith.science/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L76O6E7WHCPP4J6ZHPC6AJKQP7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:L76O6E7WHCPP4J6ZHPC6AJKQP7","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":"2d8079ea93d5d0d7a405a8be094c352d57449587b7a198ed027bfea5930fea40","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-02-27T20:03:06Z","title_canon_sha256":"39f4acfba176caf14b6027dfa2b7cac3c91445046b1e5eed904382bb6eadf90b"},"schema_version":"1.0","source":{"id":"1502.08040","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.08040","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"arxiv_version","alias_value":"1502.08040v2","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.08040","created_at":"2026-05-18T02:20:30Z"},{"alias_kind":"pith_short_12","alias_value":"L76O6E7WHCPP","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"L76O6E7WHCPP4J6Z","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"L76O6E7W","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:78db6300849a4b78a1fa1eb372644c9d44d54e6b6489f56fa783f89356d24301","target":"graph","created_at":"2026-05-18T02:20:30Z","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":"Vital signs such as pulse rate and breathing rate are currently measured using contact probes. But, non-contact methods for measuring vital signs are desirable both in hospital settings (e.g. in NICU) and for ubiquitous in-situ health tracking (e.g. on mobile phone and computers with webcams). Recently, camera-based non-contact vital sign monitoring have been shown to be feasible. However, camera-based vital sign monitoring is challenging for people with darker skin tone, under low lighting conditions, and/or during movement of an individual in front of the camera. In this paper, we propose di","authors_text":"Ashok Veeraraghavan, Ashutosh Sabharval, Mayank Kumar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-02-27T20:03:06Z","title":"DistancePPG: Robust non-contact vital signs monitoring using a camera"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.08040","kind":"arxiv","version":2},"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:b7218d9e157f3f4587d665940324084317f1c4aec814a1017cc1ee500531b5e5","target":"record","created_at":"2026-05-18T02:20:30Z","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":"2d8079ea93d5d0d7a405a8be094c352d57449587b7a198ed027bfea5930fea40","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-02-27T20:03:06Z","title_canon_sha256":"39f4acfba176caf14b6027dfa2b7cac3c91445046b1e5eed904382bb6eadf90b"},"schema_version":"1.0","source":{"id":"1502.08040","kind":"arxiv","version":2}},"canonical_sha256":"5ffcef13f6389efe27d93bc5e025507fcf57a3a46cf2240e46f93379da873a2a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5ffcef13f6389efe27d93bc5e025507fcf57a3a46cf2240e46f93379da873a2a","first_computed_at":"2026-05-18T02:20:30.081775Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:20:30.081775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SyrrZP5H8VqzfQYeSkKDhwGZJ1zx4SNEYKTreM8Qpfjxc26ddRcNzxKFgDYKNzlMzQCbvL/Qfqrv53L3igD8BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:20:30.082175Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.08040","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b7218d9e157f3f4587d665940324084317f1c4aec814a1017cc1ee500531b5e5","sha256:78db6300849a4b78a1fa1eb372644c9d44d54e6b6489f56fa783f89356d24301"],"state_sha256":"f5f1b56f40047a7c0348631580ed48d2b5083f4efecdf8c047dc8ee3bdb014d4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1dcC9+qxyvB5bT+IYW75xR7TdVTYWmoF/9JgbKHDMWegtLortNjjtQXf0IuPS9n8pL7mc3CoLjzIFP6fyBaRDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T14:31:48.373538Z","bundle_sha256":"fd1b125121270d711e688f151e6697af0f71d39c62db37676973c02b217aa7e9"}}