{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:MEK4YEET6BNUXML3RXJJAW6XDF","short_pith_number":"pith:MEK4YEET","canonical_record":{"source":{"id":"2108.08923","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-08-19T21:31:30Z","cross_cats_sorted":[],"title_canon_sha256":"d4bb49780f5e69c6feaac85113162d2e04932112a6d36a76fb153efb185b66c8","abstract_canon_sha256":"3e5add60d66e1c18f6c3937f40af8132abd29d4233f9ced26e73acbec4e5f981"},"schema_version":"1.0"},"canonical_sha256":"6115cc1093f05b4bb17b8dd2905bd7197dbf8d03de972760532e73633c1f5f55","source":{"kind":"arxiv","id":"2108.08923","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.08923","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"arxiv_version","alias_value":"2108.08923v2","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.08923","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_12","alias_value":"MEK4YEET6BNU","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_16","alias_value":"MEK4YEET6BNUXML3","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_8","alias_value":"MEK4YEET","created_at":"2026-07-05T03:14:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:MEK4YEET6BNUXML3RXJJAW6XDF","target":"record","payload":{"canonical_record":{"source":{"id":"2108.08923","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-08-19T21:31:30Z","cross_cats_sorted":[],"title_canon_sha256":"d4bb49780f5e69c6feaac85113162d2e04932112a6d36a76fb153efb185b66c8","abstract_canon_sha256":"3e5add60d66e1c18f6c3937f40af8132abd29d4233f9ced26e73acbec4e5f981"},"schema_version":"1.0"},"canonical_sha256":"6115cc1093f05b4bb17b8dd2905bd7197dbf8d03de972760532e73633c1f5f55","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:14:46.422640Z","signature_b64":"cMJ/N08zelI8gA5w5ytrREcLN6cvaitInWzvozf99hO6HVp7yTa5r7NyS6ehBi8QWAL42YsjBfqfjMlFJWEnAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6115cc1093f05b4bb17b8dd2905bd7197dbf8d03de972760532e73633c1f5f55","last_reissued_at":"2026-07-05T03:14:46.422199Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:14:46.422199Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.08923","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":"2026-07-05T03:14:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"msATY9LwT/9Em8OF0oz9VBcxw16KXb7UIRgbPfSveFcxa7EGHSVmvo9EuLNSWPSEVsK5ZY+qI0POLM50SlyBCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T22:14:27.286097Z"},"content_sha256":"d89c62401595bc22971ef59a02574c0292c6ff5485b3cc0088b384142ebde070","schema_version":"1.0","event_id":"sha256:d89c62401595bc22971ef59a02574c0292c6ff5485b3cc0088b384142ebde070"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:MEK4YEET6BNUXML3RXJJAW6XDF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CenterPoly: real-time instance segmentation using bounding polygons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Guillaume-Alexandre Bilodeau, Hughes Perreault, Maguelonne H\\'eritier, Nicolas Saunier","submitted_at":"2021-08-19T21:31:30Z","abstract_excerpt":"We present a novel method, called CenterPoly, for real-time instance segmentation using bounding polygons. We apply it to detect road users in dense urban environments, making it suitable for applications in intelligent transportation systems like automated vehicles. CenterPoly detects objects by their center keypoint while predicting a fixed number of polygon vertices for each object, thus performing detection and segmentation in parallel. Most of the network parameters are shared by the network heads, making it fast and lightweight enough to run at real-time speed. To properly convert mask g"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.08923","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2108.08923/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":"2026-07-05T03:14:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mEd2AGrC8ULpxWiv00hcXqUq4XCrki4BgjN1lSyRjTxCL0PLq3ZfPZ7UgeLrjSRhe3R3afDiaBuXnPYHok+XCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T22:14:27.286595Z"},"content_sha256":"5836c235de78e304d02ea0e9f1349753dbf5e068c57e83b8450c6ad78db33d62","schema_version":"1.0","event_id":"sha256:5836c235de78e304d02ea0e9f1349753dbf5e068c57e83b8450c6ad78db33d62"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MEK4YEET6BNUXML3RXJJAW6XDF/bundle.json","state_url":"https://pith.science/pith/MEK4YEET6BNUXML3RXJJAW6XDF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MEK4YEET6BNUXML3RXJJAW6XDF/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":"2026-07-31T22:14:27Z","links":{"resolver":"https://pith.science/pith/MEK4YEET6BNUXML3RXJJAW6XDF","bundle":"https://pith.science/pith/MEK4YEET6BNUXML3RXJJAW6XDF/bundle.json","state":"https://pith.science/pith/MEK4YEET6BNUXML3RXJJAW6XDF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MEK4YEET6BNUXML3RXJJAW6XDF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:MEK4YEET6BNUXML3RXJJAW6XDF","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":"3e5add60d66e1c18f6c3937f40af8132abd29d4233f9ced26e73acbec4e5f981","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-08-19T21:31:30Z","title_canon_sha256":"d4bb49780f5e69c6feaac85113162d2e04932112a6d36a76fb153efb185b66c8"},"schema_version":"1.0","source":{"id":"2108.08923","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.08923","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"arxiv_version","alias_value":"2108.08923v2","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.08923","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_12","alias_value":"MEK4YEET6BNU","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_16","alias_value":"MEK4YEET6BNUXML3","created_at":"2026-07-05T03:14:46Z"},{"alias_kind":"pith_short_8","alias_value":"MEK4YEET","created_at":"2026-07-05T03:14:46Z"}],"graph_snapshots":[{"event_id":"sha256:5836c235de78e304d02ea0e9f1349753dbf5e068c57e83b8450c6ad78db33d62","target":"graph","created_at":"2026-07-05T03:14:46Z","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/2108.08923/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a novel method, called CenterPoly, for real-time instance segmentation using bounding polygons. We apply it to detect road users in dense urban environments, making it suitable for applications in intelligent transportation systems like automated vehicles. CenterPoly detects objects by their center keypoint while predicting a fixed number of polygon vertices for each object, thus performing detection and segmentation in parallel. Most of the network parameters are shared by the network heads, making it fast and lightweight enough to run at real-time speed. To properly convert mask g","authors_text":"Guillaume-Alexandre Bilodeau, Hughes Perreault, Maguelonne H\\'eritier, Nicolas Saunier","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-08-19T21:31:30Z","title":"CenterPoly: real-time instance segmentation using bounding polygons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.08923","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:d89c62401595bc22971ef59a02574c0292c6ff5485b3cc0088b384142ebde070","target":"record","created_at":"2026-07-05T03:14:46Z","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":"3e5add60d66e1c18f6c3937f40af8132abd29d4233f9ced26e73acbec4e5f981","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-08-19T21:31:30Z","title_canon_sha256":"d4bb49780f5e69c6feaac85113162d2e04932112a6d36a76fb153efb185b66c8"},"schema_version":"1.0","source":{"id":"2108.08923","kind":"arxiv","version":2}},"canonical_sha256":"6115cc1093f05b4bb17b8dd2905bd7197dbf8d03de972760532e73633c1f5f55","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6115cc1093f05b4bb17b8dd2905bd7197dbf8d03de972760532e73633c1f5f55","first_computed_at":"2026-07-05T03:14:46.422199Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:14:46.422199Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cMJ/N08zelI8gA5w5ytrREcLN6cvaitInWzvozf99hO6HVp7yTa5r7NyS6ehBi8QWAL42YsjBfqfjMlFJWEnAw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:14:46.422640Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.08923","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d89c62401595bc22971ef59a02574c0292c6ff5485b3cc0088b384142ebde070","sha256:5836c235de78e304d02ea0e9f1349753dbf5e068c57e83b8450c6ad78db33d62"],"state_sha256":"b8b813ee6b854e51da354d89b193cf9344dc9fd56d805c3d009b232ffa77e13c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xvvFh1JOF4aid/Iy/RLw6nwgRVvo7hnccwtdPaT80j1avKaH73c5oqKsTxPn3J665Dl6x8r8MsAq8AJN+xCMCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T22:14:27.291876Z","bundle_sha256":"07d72d452b3e772a30a2b49ae7ff80599c8c2d571ad9605af8385a63eef0c7ee"}}