{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:2ISYXQB5Q5ZRR74WCTEU3WFHLN","short_pith_number":"pith:2ISYXQB5","canonical_record":{"source":{"id":"2104.14066","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-04-29T01:01:50Z","cross_cats_sorted":[],"title_canon_sha256":"e3ab397c96fa05394df2b7ce447e81a689ac0b7a133f862911e3cd62eda8b4fc","abstract_canon_sha256":"811903ef6a4e353f97f4cf7772555cfd93e1913444a49d7c6dcb0026dd63cfb7"},"schema_version":"1.0"},"canonical_sha256":"d2258bc03d877318ff9614c94dd8a75b425ae21d736af8e7d76237ee6fc71959","source":{"kind":"arxiv","id":"2104.14066","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.14066","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"arxiv_version","alias_value":"2104.14066v3","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.14066","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_12","alias_value":"2ISYXQB5Q5ZR","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_16","alias_value":"2ISYXQB5Q5ZRR74W","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_8","alias_value":"2ISYXQB5","created_at":"2026-07-05T02:42:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:2ISYXQB5Q5ZRR74WCTEU3WFHLN","target":"record","payload":{"canonical_record":{"source":{"id":"2104.14066","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-04-29T01:01:50Z","cross_cats_sorted":[],"title_canon_sha256":"e3ab397c96fa05394df2b7ce447e81a689ac0b7a133f862911e3cd62eda8b4fc","abstract_canon_sha256":"811903ef6a4e353f97f4cf7772555cfd93e1913444a49d7c6dcb0026dd63cfb7"},"schema_version":"1.0"},"canonical_sha256":"d2258bc03d877318ff9614c94dd8a75b425ae21d736af8e7d76237ee6fc71959","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:42:14.962662Z","signature_b64":"a19LmO+bTuwH+GS9Blqbdgbec+DwMlouZ+zlGjymmgGIAPI4e+ia0qyqlmNiPWy5SGo5aa/MIFrtD+iLDp77DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2258bc03d877318ff9614c94dd8a75b425ae21d736af8e7d76237ee6fc71959","last_reissued_at":"2026-07-05T02:42:14.962213Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:42:14.962213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.14066","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:42:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uie13uuJgt6qQajf+zhPugPFnPWSKTz13/ob+YThthdVoJd4d0qbTcR+X7GTK6yietyy2CXc/0cZiSr8/DWmAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T15:55:47.069677Z"},"content_sha256":"42a5525646fdbbd16d3ea22ba0190b21363ddf302af412001d34f473e5488d4f","schema_version":"1.0","event_id":"sha256:42a5525646fdbbd16d3ea22ba0190b21363ddf302af412001d34f473e5488d4f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:2ISYXQB5Q5ZRR74WCTEU3WFHLN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Objects as Extreme Points","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Bo Meng, Degang Sun, Junxing Ren, Min Li, Yang Yang, Zihao Huang","submitted_at":"2021-04-29T01:01:50Z","abstract_excerpt":"Object detection can be regarded as a pixel clustering task, and its boundary is determined by four extreme points (leftmost, top, rightmost, and bottom). However, most studies focus on the center or corner points of the object, which are actually conditional results of the extreme points. In this paper, we present an Extreme-Point-Prediction- Based object detector (EPP-Net), which directly regresses the relative displacement vector between each pixel and the four extreme points. We also propose a new metric to measure the similarity between two groups of extreme points, namely, Extreme Inters"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.14066","kind":"arxiv","version":3},"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/2104.14066/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":"2026-07-05T02:42:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/9IP1zw4SsIXD9kTFFUJHlQRi01D2HtiN0VcHGRu71DEYWscPNZiHAT59KCIhyLVPY5Ga1NYUYOn8dwN5mPkCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T15:55:47.070541Z"},"content_sha256":"1ef9c9361b1771f285653d1d507d298badad6b03648983c4624caa4e7669717d","schema_version":"1.0","event_id":"sha256:1ef9c9361b1771f285653d1d507d298badad6b03648983c4624caa4e7669717d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/bundle.json","state_url":"https://pith.science/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/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":"2026-08-03T15:55:47Z","links":{"resolver":"https://pith.science/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN","bundle":"https://pith.science/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/bundle.json","state":"https://pith.science/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ISYXQB5Q5ZRR74WCTEU3WFHLN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:2ISYXQB5Q5ZRR74WCTEU3WFHLN","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":"811903ef6a4e353f97f4cf7772555cfd93e1913444a49d7c6dcb0026dd63cfb7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-04-29T01:01:50Z","title_canon_sha256":"e3ab397c96fa05394df2b7ce447e81a689ac0b7a133f862911e3cd62eda8b4fc"},"schema_version":"1.0","source":{"id":"2104.14066","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.14066","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"arxiv_version","alias_value":"2104.14066v3","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.14066","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_12","alias_value":"2ISYXQB5Q5ZR","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_16","alias_value":"2ISYXQB5Q5ZRR74W","created_at":"2026-07-05T02:42:14Z"},{"alias_kind":"pith_short_8","alias_value":"2ISYXQB5","created_at":"2026-07-05T02:42:14Z"}],"graph_snapshots":[{"event_id":"sha256:1ef9c9361b1771f285653d1d507d298badad6b03648983c4624caa4e7669717d","target":"graph","created_at":"2026-07-05T02:42:14Z","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/2104.14066/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Object detection can be regarded as a pixel clustering task, and its boundary is determined by four extreme points (leftmost, top, rightmost, and bottom). However, most studies focus on the center or corner points of the object, which are actually conditional results of the extreme points. In this paper, we present an Extreme-Point-Prediction- Based object detector (EPP-Net), which directly regresses the relative displacement vector between each pixel and the four extreme points. We also propose a new metric to measure the similarity between two groups of extreme points, namely, Extreme Inters","authors_text":"Bo Meng, Degang Sun, Junxing Ren, Min Li, Yang Yang, Zihao Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-04-29T01:01:50Z","title":"Objects as Extreme Points"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.14066","kind":"arxiv","version":3},"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":"sha256:42a5525646fdbbd16d3ea22ba0190b21363ddf302af412001d34f473e5488d4f","target":"record","created_at":"2026-07-05T02:42:14Z","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":"811903ef6a4e353f97f4cf7772555cfd93e1913444a49d7c6dcb0026dd63cfb7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-04-29T01:01:50Z","title_canon_sha256":"e3ab397c96fa05394df2b7ce447e81a689ac0b7a133f862911e3cd62eda8b4fc"},"schema_version":"1.0","source":{"id":"2104.14066","kind":"arxiv","version":3}},"canonical_sha256":"d2258bc03d877318ff9614c94dd8a75b425ae21d736af8e7d76237ee6fc71959","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2258bc03d877318ff9614c94dd8a75b425ae21d736af8e7d76237ee6fc71959","first_computed_at":"2026-07-05T02:42:14.962213Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:42:14.962213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a19LmO+bTuwH+GS9Blqbdgbec+DwMlouZ+zlGjymmgGIAPI4e+ia0qyqlmNiPWy5SGo5aa/MIFrtD+iLDp77DA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:42:14.962662Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.14066","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:42a5525646fdbbd16d3ea22ba0190b21363ddf302af412001d34f473e5488d4f","sha256:1ef9c9361b1771f285653d1d507d298badad6b03648983c4624caa4e7669717d"],"state_sha256":"a895787924a11110b6622589073bf363d2322a35d71dafa469c3ab5c8ed487a9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q3MzFysorM/SrjGp5Jr/7iemohyX7BYYgKknfzmmqSLcA3VvcqGRfoBpz3877npqnf7tmoQTS8hbDqqwXdS2Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T15:55:47.077098Z","bundle_sha256":"cdb059ad6d621ce376fdd8ee6c670eaf0fe015ef0cb57d8d0a306e60e719672d"}}