{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:46L6LPHTEBQLOOJMCAASAWXX65","short_pith_number":"pith:46L6LPHT","canonical_record":{"source":{"id":"2012.13217","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-24T12:28:47Z","cross_cats_sorted":[],"title_canon_sha256":"9e171fbf415350dccf2797d92b451c8e1297e5a86decd4df58ad3a9ef433436e","abstract_canon_sha256":"c2b93eb3e29a63a2c18d7f1ac97e03166bff94216dc1930f296d04b38092662c"},"schema_version":"1.0"},"canonical_sha256":"e797e5bcf32060b7392c1001205af7f7549117710b638ff009fe12f6c8ff3049","source":{"kind":"arxiv","id":"2012.13217","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13217","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13217v1","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13217","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_12","alias_value":"46L6LPHTEBQL","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_16","alias_value":"46L6LPHTEBQLOOJM","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_8","alias_value":"46L6LPHT","created_at":"2026-07-05T03:37:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:46L6LPHTEBQLOOJMCAASAWXX65","target":"record","payload":{"canonical_record":{"source":{"id":"2012.13217","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-24T12:28:47Z","cross_cats_sorted":[],"title_canon_sha256":"9e171fbf415350dccf2797d92b451c8e1297e5a86decd4df58ad3a9ef433436e","abstract_canon_sha256":"c2b93eb3e29a63a2c18d7f1ac97e03166bff94216dc1930f296d04b38092662c"},"schema_version":"1.0"},"canonical_sha256":"e797e5bcf32060b7392c1001205af7f7549117710b638ff009fe12f6c8ff3049","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:37:10.778683Z","signature_b64":"d1ha7Qa5x613LThf/EhqDPgJUb2YDKV2sVNbrm7zThJHk++nxLRBpY+xifSibjHGx2Ef0l13I610hnzr4l1cDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e797e5bcf32060b7392c1001205af7f7549117710b638ff009fe12f6c8ff3049","last_reissued_at":"2026-07-05T03:37:10.778135Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:37:10.778135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.13217","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":"2026-07-05T03:37:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wcP3zvTu8jRPqantiyF5fB9FnNBZlIsJwIFmfPr9fA2BfWSMrfxEkTVRXN1287Ph3nuPFA/ojgvAy41qdVfMBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T14:51:19.213117Z"},"content_sha256":"6946402019452021e2b44b6b5cc5064d8e79584edeb257b9c186bf4d5c2225ed","schema_version":"1.0","event_id":"sha256:6946402019452021e2b44b6b5cc5064d8e79584edeb257b9c186bf4d5c2225ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:46L6LPHTEBQLOOJMCAASAWXX65","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dynamic Facial Expression Recognition under Partial Occlusion with Optical Flow Reconstruction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Benjamin Allaert, Chaabane Djeraba, Delphine Poux, Ioan Marius Bilasco, Mohammed Bennamoun, Nacim Ihaddadene","submitted_at":"2020-12-24T12:28:47Z","abstract_excerpt":"Video facial expression recognition is useful for many applications and received much interest lately. Although some solutions give really good results in a controlled environment (no occlusion), recognition in the presence of partial facial occlusion remains a challenging task. To handle occlusions, solutions based on the reconstruction of the occluded part of the face have been proposed. These solutions are mainly based on the texture or the geometry of the face. However, the similarity of the face movement between different persons doing the same expression seems to be a real asset for the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13217","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/2012.13217/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":"2026-07-05T03:37:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N11dVmlwY3My0kT0j/eBEFHt0pHdj2ox+0OZ+lcB/pLXi0TqjP/6U3sbXVs41EEnZaDC7xD4wfK43lGCENBaCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T14:51:19.213523Z"},"content_sha256":"8743495aeadc371b6e1bcca05619220386175c0a5143e79231af1db08046b15b","schema_version":"1.0","event_id":"sha256:8743495aeadc371b6e1bcca05619220386175c0a5143e79231af1db08046b15b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/46L6LPHTEBQLOOJMCAASAWXX65/bundle.json","state_url":"https://pith.science/pith/46L6LPHTEBQLOOJMCAASAWXX65/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/46L6LPHTEBQLOOJMCAASAWXX65/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":"2026-07-05T14:51:19Z","links":{"resolver":"https://pith.science/pith/46L6LPHTEBQLOOJMCAASAWXX65","bundle":"https://pith.science/pith/46L6LPHTEBQLOOJMCAASAWXX65/bundle.json","state":"https://pith.science/pith/46L6LPHTEBQLOOJMCAASAWXX65/state.json","well_known_bundle":"https://pith.science/.well-known/pith/46L6LPHTEBQLOOJMCAASAWXX65/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:46L6LPHTEBQLOOJMCAASAWXX65","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":"c2b93eb3e29a63a2c18d7f1ac97e03166bff94216dc1930f296d04b38092662c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-24T12:28:47Z","title_canon_sha256":"9e171fbf415350dccf2797d92b451c8e1297e5a86decd4df58ad3a9ef433436e"},"schema_version":"1.0","source":{"id":"2012.13217","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13217","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13217v1","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13217","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_12","alias_value":"46L6LPHTEBQL","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_16","alias_value":"46L6LPHTEBQLOOJM","created_at":"2026-07-05T03:37:10Z"},{"alias_kind":"pith_short_8","alias_value":"46L6LPHT","created_at":"2026-07-05T03:37:10Z"}],"graph_snapshots":[{"event_id":"sha256:8743495aeadc371b6e1bcca05619220386175c0a5143e79231af1db08046b15b","target":"graph","created_at":"2026-07-05T03:37:10Z","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/2012.13217/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Video facial expression recognition is useful for many applications and received much interest lately. Although some solutions give really good results in a controlled environment (no occlusion), recognition in the presence of partial facial occlusion remains a challenging task. To handle occlusions, solutions based on the reconstruction of the occluded part of the face have been proposed. These solutions are mainly based on the texture or the geometry of the face. However, the similarity of the face movement between different persons doing the same expression seems to be a real asset for the ","authors_text":"Benjamin Allaert, Chaabane Djeraba, Delphine Poux, Ioan Marius Bilasco, Mohammed Bennamoun, Nacim Ihaddadene","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-24T12:28:47Z","title":"Dynamic Facial Expression Recognition under Partial Occlusion with Optical Flow Reconstruction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13217","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":"sha256:6946402019452021e2b44b6b5cc5064d8e79584edeb257b9c186bf4d5c2225ed","target":"record","created_at":"2026-07-05T03:37:10Z","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":"c2b93eb3e29a63a2c18d7f1ac97e03166bff94216dc1930f296d04b38092662c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-24T12:28:47Z","title_canon_sha256":"9e171fbf415350dccf2797d92b451c8e1297e5a86decd4df58ad3a9ef433436e"},"schema_version":"1.0","source":{"id":"2012.13217","kind":"arxiv","version":1}},"canonical_sha256":"e797e5bcf32060b7392c1001205af7f7549117710b638ff009fe12f6c8ff3049","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e797e5bcf32060b7392c1001205af7f7549117710b638ff009fe12f6c8ff3049","first_computed_at":"2026-07-05T03:37:10.778135Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:37:10.778135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"d1ha7Qa5x613LThf/EhqDPgJUb2YDKV2sVNbrm7zThJHk++nxLRBpY+xifSibjHGx2Ef0l13I610hnzr4l1cDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:37:10.778683Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.13217","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6946402019452021e2b44b6b5cc5064d8e79584edeb257b9c186bf4d5c2225ed","sha256:8743495aeadc371b6e1bcca05619220386175c0a5143e79231af1db08046b15b"],"state_sha256":"5a62a3142ec713c250573665b0e6899e10407b4d6550b397d21391b98491fe8a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0Hg9nDddHCa9ocnvCqjTbaCfy2dT52fcFaHRgsBQ1VkuB9ZpdysRPwAY09nLvV8LGTy6oJUmW359wJPP+bNuBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T14:51:19.216352Z","bundle_sha256":"7021394b90666148aadd6c5db14e7e8f7a3fb925e027f0b4e411735874d73dfd"}}