{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ZFP25L3P7K55EYXRGW5IRB7YHH","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":"78d3e6b5ba2f8affec2fa16329c6f456cb29b9ebfbf3ef5f9415b756537b6e82","cross_cats_sorted":["cs.AI","cs.DC"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-12-14T04:47:12Z","title_canon_sha256":"a87053a7c96f111f73f32348815aae6e75df7ba2d35a2132d878ea42526a99f7"},"schema_version":"1.0","source":{"id":"2112.07159","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.07159","created_at":"2026-07-05T03:55:51Z"},{"alias_kind":"arxiv_version","alias_value":"2112.07159v2","created_at":"2026-07-05T03:55:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.07159","created_at":"2026-07-05T03:55:51Z"},{"alias_kind":"pith_short_12","alias_value":"ZFP25L3P7K55","created_at":"2026-07-05T03:55:51Z"},{"alias_kind":"pith_short_16","alias_value":"ZFP25L3P7K55EYXR","created_at":"2026-07-05T03:55:51Z"},{"alias_kind":"pith_short_8","alias_value":"ZFP25L3P","created_at":"2026-07-05T03:55:51Z"}],"graph_snapshots":[{"event_id":"sha256:a4a5da980e18e8cc425d9702c2617f0996d258e8f4b115afadc5242f0ac2db06","target":"graph","created_at":"2026-07-05T03:55:51Z","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/2112.07159/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Social distancing can reduce the infection rates in respiratory pandemics such as COVID-19. Traffic intersections are particularly suitable for monitoring and evaluation of social distancing behavior in metropolises. We propose and evaluate a privacy-preserving social distancing analysis system (B-SDA), which uses bird's-eye view video recordings of pedestrians who cross traffic intersections. We devise algorithms for video pre-processing, object detection and tracking which are rooted in the known computer-vision and deep learning techniques, but modified to address the problem of detecting v","authors_text":"Gil Zussman, Hongzhe Ye, Mingfei Sun, Zhengye Yang, Zihao Xiong, Zoran Kostic","cross_cats":["cs.AI","cs.DC"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-12-14T04:47:12Z","title":"Birds Eye View Social Distancing Analysis System"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.07159","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":"sha256:378b2b0d15df7e9576cf42ec2d8511ff2c71ad7e287a323fcd12474b228ca121","target":"record","created_at":"2026-07-05T03:55:51Z","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":"78d3e6b5ba2f8affec2fa16329c6f456cb29b9ebfbf3ef5f9415b756537b6e82","cross_cats_sorted":["cs.AI","cs.DC"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-12-14T04:47:12Z","title_canon_sha256":"a87053a7c96f111f73f32348815aae6e75df7ba2d35a2132d878ea42526a99f7"},"schema_version":"1.0","source":{"id":"2112.07159","kind":"arxiv","version":2}},"canonical_sha256":"c95faeaf6ffabbd262f135ba8887f839de631a2b5713b6598b4758eeab422e89","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c95faeaf6ffabbd262f135ba8887f839de631a2b5713b6598b4758eeab422e89","first_computed_at":"2026-07-05T03:55:51.176792Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:55:51.176792Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TnmSPBsXhZIkg5gBcCfElRSSTCnxQLDS/13zyAxYT5dxiCABN72KhyfUki9JMuqEn5cto8JYDKBHPeQUbP8CDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:55:51.177274Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.07159","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:378b2b0d15df7e9576cf42ec2d8511ff2c71ad7e287a323fcd12474b228ca121","sha256:a4a5da980e18e8cc425d9702c2617f0996d258e8f4b115afadc5242f0ac2db06"],"state_sha256":"1724ef61ef837824b0293eb4527c841c8f4cb6e98be13a2a9db9c979c1cb995b"}