{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:EB55V4YX4TQEV66FXBHADY2IZM","short_pith_number":"pith:EB55V4YX","canonical_record":{"source":{"id":"2207.10669","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-07-21T10:06:07Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"241065559ef9b5e7e6fa39acf1587d6abed16db97f7df6550b19e7370e98bc60","abstract_canon_sha256":"5ca2c72422bafeef88b8e210d178dfd4f146c051d5171e8de64e28464eaa403d"},"schema_version":"1.0"},"canonical_sha256":"207bdaf317e4e04afbc5b84e01e348cb3f17a71710f5f4099864a968774bb3b0","source":{"kind":"arxiv","id":"2207.10669","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2207.10669","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"arxiv_version","alias_value":"2207.10669v1","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.10669","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_12","alias_value":"EB55V4YX4TQE","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_16","alias_value":"EB55V4YX4TQEV66F","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_8","alias_value":"EB55V4YX","created_at":"2026-07-05T04:42:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:EB55V4YX4TQEV66FXBHADY2IZM","target":"record","payload":{"canonical_record":{"source":{"id":"2207.10669","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-07-21T10:06:07Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"241065559ef9b5e7e6fa39acf1587d6abed16db97f7df6550b19e7370e98bc60","abstract_canon_sha256":"5ca2c72422bafeef88b8e210d178dfd4f146c051d5171e8de64e28464eaa403d"},"schema_version":"1.0"},"canonical_sha256":"207bdaf317e4e04afbc5b84e01e348cb3f17a71710f5f4099864a968774bb3b0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:42:38.178735Z","signature_b64":"j+pk/uCLbJzUojpMiPnTjC+LTr3Ae4AASNyK7kK6zuWvBnKtiLFXWZBrFUsRF4nBj2UtU43LdZR7tnzcddoaCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"207bdaf317e4e04afbc5b84e01e348cb3f17a71710f5f4099864a968774bb3b0","last_reissued_at":"2026-07-05T04:42:38.178199Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:42:38.178199Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2207.10669","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:42:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V9okc8dGSKdmV73N3U+EPsMEB9xAKCJd7WVWnotWeXISrAfL1lWfVILsRGoChaGD62bOAUF6pNnghQMHH95TDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T08:43:35.520479Z"},"content_sha256":"2752f7a8dbd49cf4f6037ccdb08a3909d60dbbf2c564b254d2a10ec07a3ae147","schema_version":"1.0","event_id":"sha256:2752f7a8dbd49cf4f6037ccdb08a3909d60dbbf2c564b254d2a10ec07a3ae147"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:EB55V4YX4TQEV66FXBHADY2IZM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Retinex-qDPC: automatic background rectified quantitative differential phase contrast imaging","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"eess.IV","authors_text":"Han Yang, Jinhua Zhou, Shuhe Zhang, Tao Peng, Tos T. J. M. Berendschot, Zeyu Ke","submitted_at":"2022-07-21T10:06:07Z","abstract_excerpt":"The quality of quantitative differential phase contrast reconstruction (qDPC) can be severely degenerated by the mismatch of the background of two oblique illuminated images, yielding problematic phase recovery results. These background mismatches may result from illumination patterns, inhomogeneous media distribution, or other defocusing layers. In previous reports, the background is manually calibrated which is time-consuming, and unstable, since new calibrations are needed if any modification to the optical system was made. It is also impossible to calibrate the background from the defocusi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.10669","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/2207.10669/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:42:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"irPmgr0esHzlg+GiNIFS93WmFg43kawHrOxH0BDTs1JMkQansZQMoZaLxf5ABNvSJOzIFobwwwPe2C+NtvRQBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T08:43:35.520851Z"},"content_sha256":"819b816334512b84bc16ae71292108469e4435e9a0b4f74c29743008a0e071bf","schema_version":"1.0","event_id":"sha256:819b816334512b84bc16ae71292108469e4435e9a0b4f74c29743008a0e071bf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EB55V4YX4TQEV66FXBHADY2IZM/bundle.json","state_url":"https://pith.science/pith/EB55V4YX4TQEV66FXBHADY2IZM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EB55V4YX4TQEV66FXBHADY2IZM/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":"2026-07-06T08:43:35Z","links":{"resolver":"https://pith.science/pith/EB55V4YX4TQEV66FXBHADY2IZM","bundle":"https://pith.science/pith/EB55V4YX4TQEV66FXBHADY2IZM/bundle.json","state":"https://pith.science/pith/EB55V4YX4TQEV66FXBHADY2IZM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EB55V4YX4TQEV66FXBHADY2IZM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:EB55V4YX4TQEV66FXBHADY2IZM","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":"5ca2c72422bafeef88b8e210d178dfd4f146c051d5171e8de64e28464eaa403d","cross_cats_sorted":["physics.optics"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-07-21T10:06:07Z","title_canon_sha256":"241065559ef9b5e7e6fa39acf1587d6abed16db97f7df6550b19e7370e98bc60"},"schema_version":"1.0","source":{"id":"2207.10669","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2207.10669","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"arxiv_version","alias_value":"2207.10669v1","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.10669","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_12","alias_value":"EB55V4YX4TQE","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_16","alias_value":"EB55V4YX4TQEV66F","created_at":"2026-07-05T04:42:38Z"},{"alias_kind":"pith_short_8","alias_value":"EB55V4YX","created_at":"2026-07-05T04:42:38Z"}],"graph_snapshots":[{"event_id":"sha256:819b816334512b84bc16ae71292108469e4435e9a0b4f74c29743008a0e071bf","target":"graph","created_at":"2026-07-05T04:42:38Z","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/2207.10669/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The quality of quantitative differential phase contrast reconstruction (qDPC) can be severely degenerated by the mismatch of the background of two oblique illuminated images, yielding problematic phase recovery results. These background mismatches may result from illumination patterns, inhomogeneous media distribution, or other defocusing layers. In previous reports, the background is manually calibrated which is time-consuming, and unstable, since new calibrations are needed if any modification to the optical system was made. It is also impossible to calibrate the background from the defocusi","authors_text":"Han Yang, Jinhua Zhou, Shuhe Zhang, Tao Peng, Tos T. J. M. Berendschot, Zeyu Ke","cross_cats":["physics.optics"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-07-21T10:06:07Z","title":"Retinex-qDPC: automatic background rectified quantitative differential phase contrast imaging"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.10669","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":"sha256:2752f7a8dbd49cf4f6037ccdb08a3909d60dbbf2c564b254d2a10ec07a3ae147","target":"record","created_at":"2026-07-05T04:42:38Z","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":"5ca2c72422bafeef88b8e210d178dfd4f146c051d5171e8de64e28464eaa403d","cross_cats_sorted":["physics.optics"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-07-21T10:06:07Z","title_canon_sha256":"241065559ef9b5e7e6fa39acf1587d6abed16db97f7df6550b19e7370e98bc60"},"schema_version":"1.0","source":{"id":"2207.10669","kind":"arxiv","version":1}},"canonical_sha256":"207bdaf317e4e04afbc5b84e01e348cb3f17a71710f5f4099864a968774bb3b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"207bdaf317e4e04afbc5b84e01e348cb3f17a71710f5f4099864a968774bb3b0","first_computed_at":"2026-07-05T04:42:38.178199Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:42:38.178199Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j+pk/uCLbJzUojpMiPnTjC+LTr3Ae4AASNyK7kK6zuWvBnKtiLFXWZBrFUsRF4nBj2UtU43LdZR7tnzcddoaCA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:42:38.178735Z","signed_message":"canonical_sha256_bytes"},"source_id":"2207.10669","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2752f7a8dbd49cf4f6037ccdb08a3909d60dbbf2c564b254d2a10ec07a3ae147","sha256:819b816334512b84bc16ae71292108469e4435e9a0b4f74c29743008a0e071bf"],"state_sha256":"ca0d568ad19ad41c679b232e2cfae5acd3c5ca365bc6f2ecf7112851daf6c0c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oFyRVUgHQkhxXmfcyPPtiyeom+s1zPw0iJKwGaFJ1PnXOwtrbIkhuQ5CMG1cxHB7FoXSnUqKex/nzKa47k8rBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T08:43:35.522757Z","bundle_sha256":"7ee0a435042a90ed54cc698d4fc5e4037c0dd75defe41a93ade699e92a75d281"}}