{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:RZBXELOWGULFJB7HMTSK4QQM3L","short_pith_number":"pith:RZBXELOW","schema_version":"1.0","canonical_sha256":"8e43722dd635165487e764e4ae420cdada49d5ced6757e7d203e45d14e20f225","source":{"kind":"arxiv","id":"2607.07996","version":1},"attestation_state":"computed","paper":{"title":"SpO$_2$ Predictor-Guided Stage-Wise Time-Frequency Reconstruction of Low-Quality Dual-Wavelength PPG for Oxygen Saturation Estimation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.LG"],"primary_cat":"eess.SP","authors_text":"Ehsan Kourkchi, Elahe Hosseini, Houman Homayoun, Mahdi Pirayesh Shirazi Nejad, Ning Miao, Setareh Rafatirad, Wei Shao, Zequan Liang","submitted_at":"2026-07-09T00:00:42Z","abstract_excerpt":"Continuous oxygen saturation (SpO$_2$) estimation from wearable photoplethysmography (PPG) is important for long-term health monitoring, but low-quality red and infrared PPG segments can distort waveform morphology and degrade SpO$_2$ prediction accuracy. Existing PPG denoising and reconstruction methods usually optimize waveform fidelity or heart rate characteristics, while time-domain waveform loss on PPG signals alone insufficiently preserves frequency structure and SpO$_2$-relevant information. This paper proposes a SpO$_2$ predictor-guided stage-wise time-frequency reconstruction framewor"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2607.07996","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2026-07-09T00:00:42Z","cross_cats_sorted":["cs.AI","cs.LG"],"title_canon_sha256":"c56615f75a0a245a19421f763ab073525ac83df36f999809d1e935e6a4d9c92e","abstract_canon_sha256":"cdfaff39659a54ff94b3df56a9e2ad707a7594d04e069163550ee17942724a69"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-10T00:19:06.993963Z","signature_b64":"VTAMxDbP3dw7tYcPPAwj16vODqvUXRwFwKwRhqdlbOA1hLthCnHAUeDhR1+Eq6omU1lpCA+AcBOxZlnY0jjIBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8e43722dd635165487e764e4ae420cdada49d5ced6757e7d203e45d14e20f225","last_reissued_at":"2026-07-10T00:19:06.993567Z","signature_status":"signed_v1","first_computed_at":"2026-07-10T00:19:06.993567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"SpO$_2$ Predictor-Guided Stage-Wise Time-Frequency Reconstruction of Low-Quality Dual-Wavelength PPG for Oxygen Saturation Estimation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.LG"],"primary_cat":"eess.SP","authors_text":"Ehsan Kourkchi, Elahe Hosseini, Houman Homayoun, Mahdi Pirayesh Shirazi Nejad, Ning Miao, Setareh Rafatirad, Wei Shao, Zequan Liang","submitted_at":"2026-07-09T00:00:42Z","abstract_excerpt":"Continuous oxygen saturation (SpO$_2$) estimation from wearable photoplethysmography (PPG) is important for long-term health monitoring, but low-quality red and infrared PPG segments can distort waveform morphology and degrade SpO$_2$ prediction accuracy. Existing PPG denoising and reconstruction methods usually optimize waveform fidelity or heart rate characteristics, while time-domain waveform loss on PPG signals alone insufficiently preserves frequency structure and SpO$_2$-relevant information. This paper proposes a SpO$_2$ predictor-guided stage-wise time-frequency reconstruction framewor"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.07996","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.07996/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2607.07996","created_at":"2026-07-10T00:19:06.993630+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.07996v1","created_at":"2026-07-10T00:19:06.993630+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.07996","created_at":"2026-07-10T00:19:06.993630+00:00"},{"alias_kind":"pith_short_12","alias_value":"RZBXELOWGULF","created_at":"2026-07-10T00:19:06.993630+00:00"},{"alias_kind":"pith_short_16","alias_value":"RZBXELOWGULFJB7H","created_at":"2026-07-10T00:19:06.993630+00:00"},{"alias_kind":"pith_short_8","alias_value":"RZBXELOW","created_at":"2026-07-10T00:19:06.993630+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L","json":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L.json","graph_json":"https://pith.science/api/pith-number/RZBXELOWGULFJB7HMTSK4QQM3L/graph.json","events_json":"https://pith.science/api/pith-number/RZBXELOWGULFJB7HMTSK4QQM3L/events.json","paper":"https://pith.science/paper/RZBXELOW"},"agent_actions":{"view_html":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L","download_json":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L.json","view_paper":"https://pith.science/paper/RZBXELOW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.07996&json=true","fetch_graph":"https://pith.science/api/pith-number/RZBXELOWGULFJB7HMTSK4QQM3L/graph.json","fetch_events":"https://pith.science/api/pith-number/RZBXELOWGULFJB7HMTSK4QQM3L/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L/action/storage_attestation","attest_author":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L/action/author_attestation","sign_citation":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L/action/citation_signature","submit_replication":"https://pith.science/pith/RZBXELOWGULFJB7HMTSK4QQM3L/action/replication_record"}},"created_at":"2026-07-10T00:19:06.993630+00:00","updated_at":"2026-07-10T00:19:06.993630+00:00"}