{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:PGVG5POB3RPDYIZS3AZE7ARNIL","short_pith_number":"pith:PGVG5POB","schema_version":"1.0","canonical_sha256":"79aa6ebdc1dc5e3c2332d8324f822d42c41e9db23e04e46d8bb8f473e1eae301","source":{"kind":"arxiv","id":"2111.10961","version":1},"attestation_state":"computed","paper":{"title":"MidNet: An Anchor-and-Angle-Free Detector for Oriented Ship Detection in Aerial Images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CV","authors_text":"Feng Jie, Junpeng Zhang, Licheng Jiao, Quanhe Yao, Xiangrong Zhang, Yuping Liang","submitted_at":"2021-11-22T02:52:30Z","abstract_excerpt":"Ship detection in aerial images remains an active yet challenging task due to arbitrary object orientation and complex background from a bird's-eye perspective. Most of the existing methods rely on angular prediction or predefined anchor boxes, making these methods highly sensitive to unstable angular regression and excessive hyper-parameter setting. To address these issues, we replace the angular-based object encoding with an anchor-and-angle-free paradigm, and propose a novel detector deploying a center and four midpoints for encoding each oriented object, namely MidNet. MidNet designs a sym"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2111.10961","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2021-11-22T02:52:30Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"582bf8bc6f034bf2af85b69a44f7cb74aebee7fe0cd56daf6bfbc5f1573ef6b6","abstract_canon_sha256":"137eb93fa4b3a9c856969733de2111075905b74284d82f98aca271738cb1d437"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:33:58.543392Z","signature_b64":"QxYb2GA0Zfo3f7CHvK2nGsrhNte4o1N6BhERG/oHwO/zneqswsabmilXPnk0sKUX3CFEagCy1nqo7u+8MbycDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"79aa6ebdc1dc5e3c2332d8324f822d42c41e9db23e04e46d8bb8f473e1eae301","last_reissued_at":"2026-07-05T03:33:58.542974Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:33:58.542974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"MidNet: An Anchor-and-Angle-Free Detector for Oriented Ship Detection in Aerial Images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CV","authors_text":"Feng Jie, Junpeng Zhang, Licheng Jiao, Quanhe Yao, Xiangrong Zhang, Yuping Liang","submitted_at":"2021-11-22T02:52:30Z","abstract_excerpt":"Ship detection in aerial images remains an active yet challenging task due to arbitrary object orientation and complex background from a bird's-eye perspective. Most of the existing methods rely on angular prediction or predefined anchor boxes, making these methods highly sensitive to unstable angular regression and excessive hyper-parameter setting. To address these issues, we replace the angular-based object encoding with an anchor-and-angle-free paradigm, and propose a novel detector deploying a center and four midpoints for encoding each oriented object, namely MidNet. MidNet designs a sym"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.10961","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/2111.10961/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2111.10961","created_at":"2026-07-05T03:33:58.543038+00:00"},{"alias_kind":"arxiv_version","alias_value":"2111.10961v1","created_at":"2026-07-05T03:33:58.543038+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.10961","created_at":"2026-07-05T03:33:58.543038+00:00"},{"alias_kind":"pith_short_12","alias_value":"PGVG5POB3RPD","created_at":"2026-07-05T03:33:58.543038+00:00"},{"alias_kind":"pith_short_16","alias_value":"PGVG5POB3RPDYIZS","created_at":"2026-07-05T03:33:58.543038+00:00"},{"alias_kind":"pith_short_8","alias_value":"PGVG5POB","created_at":"2026-07-05T03:33:58.543038+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL","json":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL.json","graph_json":"https://pith.science/api/pith-number/PGVG5POB3RPDYIZS3AZE7ARNIL/graph.json","events_json":"https://pith.science/api/pith-number/PGVG5POB3RPDYIZS3AZE7ARNIL/events.json","paper":"https://pith.science/paper/PGVG5POB"},"agent_actions":{"view_html":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL","download_json":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL.json","view_paper":"https://pith.science/paper/PGVG5POB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2111.10961&json=true","fetch_graph":"https://pith.science/api/pith-number/PGVG5POB3RPDYIZS3AZE7ARNIL/graph.json","fetch_events":"https://pith.science/api/pith-number/PGVG5POB3RPDYIZS3AZE7ARNIL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL/action/storage_attestation","attest_author":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL/action/author_attestation","sign_citation":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL/action/citation_signature","submit_replication":"https://pith.science/pith/PGVG5POB3RPDYIZS3AZE7ARNIL/action/replication_record"}},"created_at":"2026-07-05T03:33:58.543038+00:00","updated_at":"2026-07-05T03:33:58.543038+00:00"}