{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:HNUIR7TTHVQQREJBACKWG4LVRJ","short_pith_number":"pith:HNUIR7TT","canonical_record":{"source":{"id":"1804.09003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-04-24T13:08:32Z","cross_cats_sorted":[],"title_canon_sha256":"9d2af146bfae8adbc06dc71d43f0815c376a67357d9bd7b005d0d12f6c0cf9f4","abstract_canon_sha256":"5a06c8ec8b28d414bf83d16904e93144ac540edbdeba6b73070db7581ddda12b"},"schema_version":"1.0"},"canonical_sha256":"3b6888fe733d6108912100956371758a458238eeb7542e65d7dc388185d2437a","source":{"kind":"arxiv","id":"1804.09003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.09003","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"arxiv_version","alias_value":"1804.09003v1","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.09003","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"pith_short_12","alias_value":"HNUIR7TTHVQQ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HNUIR7TTHVQQREJB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HNUIR7TT","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:HNUIR7TTHVQQREJBACKWG4LVRJ","target":"record","payload":{"canonical_record":{"source":{"id":"1804.09003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-04-24T13:08:32Z","cross_cats_sorted":[],"title_canon_sha256":"9d2af146bfae8adbc06dc71d43f0815c376a67357d9bd7b005d0d12f6c0cf9f4","abstract_canon_sha256":"5a06c8ec8b28d414bf83d16904e93144ac540edbdeba6b73070db7581ddda12b"},"schema_version":"1.0"},"canonical_sha256":"3b6888fe733d6108912100956371758a458238eeb7542e65d7dc388185d2437a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:17:36.620591Z","signature_b64":"axYve8Wqp199bWQELSSpYtgDM4BMdRpVdXsSF7U9QBz6ioCsQOuXXjOh+/Dzp6UsevyNoiji8iRFll9Kb8XYBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3b6888fe733d6108912100956371758a458238eeb7542e65d7dc388185d2437a","last_reissued_at":"2026-05-18T00:17:36.619984Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:17:36.619984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.09003","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":"2026-05-18T00:17:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5rRIpDh7almBwMHM7yQ9+sluKWpc/hXT5V9aQhXAjWjv1AC9R+vyRkGWLguInSyEydeTpnCkIwVpGWic14gbCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:22:41.129520Z"},"content_sha256":"c63688cd2b400d3567567356affcfb107998c7f6cea519cca576827350ceab1c","schema_version":"1.0","event_id":"sha256:c63688cd2b400d3567567356affcfb107998c7f6cea519cca576827350ceab1c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:HNUIR7TTHVQQREJBACKWG4LVRJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Anchor-Free Region Proposal Network for Faster R-CNN based Text Detection Approaches","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Lei Sun, Qiang Huo, Zhuoyao Zhong","submitted_at":"2018-04-24T13:08:32Z","abstract_excerpt":"The anchor mechanism of Faster R-CNN and SSD framework is considered not effective enough to scene text detection, which can be attributed to its IoU based matching criterion between anchors and ground-truth boxes. In order to better enclose scene text instances of various shapes, it requires to design anchors of various scales, aspect ratios and even orientations manually, which makes anchor-based methods sophisticated and inefficient. In this paper, we propose a novel anchor-free region proposal network (AF-RPN) to replace the original anchor-based RPN in the Faster R-CNN framework to addres"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.09003","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":""},"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":"2026-05-18T00:17:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BWMu7wLGzHTGK0t/swx8Qw4EIUYb+6ObsRzWyYjjZNhSDLqAcoJCvL0NQ3V5N3ZUUMWALSR18BZ6mH2mFFGuBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:22:41.130103Z"},"content_sha256":"48f6c7ce72dbcf1e10e95d5789c896e7ee495e6f063f2771a0a388c687762069","schema_version":"1.0","event_id":"sha256:48f6c7ce72dbcf1e10e95d5789c896e7ee495e6f063f2771a0a388c687762069"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/bundle.json","state_url":"https://pith.science/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/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":"2026-05-26T07:22:41Z","links":{"resolver":"https://pith.science/pith/HNUIR7TTHVQQREJBACKWG4LVRJ","bundle":"https://pith.science/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/bundle.json","state":"https://pith.science/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HNUIR7TTHVQQREJBACKWG4LVRJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:HNUIR7TTHVQQREJBACKWG4LVRJ","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":"5a06c8ec8b28d414bf83d16904e93144ac540edbdeba6b73070db7581ddda12b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-04-24T13:08:32Z","title_canon_sha256":"9d2af146bfae8adbc06dc71d43f0815c376a67357d9bd7b005d0d12f6c0cf9f4"},"schema_version":"1.0","source":{"id":"1804.09003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.09003","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"arxiv_version","alias_value":"1804.09003v1","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.09003","created_at":"2026-05-18T00:17:36Z"},{"alias_kind":"pith_short_12","alias_value":"HNUIR7TTHVQQ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HNUIR7TTHVQQREJB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HNUIR7TT","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:48f6c7ce72dbcf1e10e95d5789c896e7ee495e6f063f2771a0a388c687762069","target":"graph","created_at":"2026-05-18T00:17:36Z","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"},"paper":{"abstract_excerpt":"The anchor mechanism of Faster R-CNN and SSD framework is considered not effective enough to scene text detection, which can be attributed to its IoU based matching criterion between anchors and ground-truth boxes. In order to better enclose scene text instances of various shapes, it requires to design anchors of various scales, aspect ratios and even orientations manually, which makes anchor-based methods sophisticated and inefficient. In this paper, we propose a novel anchor-free region proposal network (AF-RPN) to replace the original anchor-based RPN in the Faster R-CNN framework to addres","authors_text":"Lei Sun, Qiang Huo, Zhuoyao Zhong","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-04-24T13:08:32Z","title":"An Anchor-Free Region Proposal Network for Faster R-CNN based Text Detection Approaches"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.09003","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:c63688cd2b400d3567567356affcfb107998c7f6cea519cca576827350ceab1c","target":"record","created_at":"2026-05-18T00:17:36Z","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":"5a06c8ec8b28d414bf83d16904e93144ac540edbdeba6b73070db7581ddda12b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-04-24T13:08:32Z","title_canon_sha256":"9d2af146bfae8adbc06dc71d43f0815c376a67357d9bd7b005d0d12f6c0cf9f4"},"schema_version":"1.0","source":{"id":"1804.09003","kind":"arxiv","version":1}},"canonical_sha256":"3b6888fe733d6108912100956371758a458238eeb7542e65d7dc388185d2437a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b6888fe733d6108912100956371758a458238eeb7542e65d7dc388185d2437a","first_computed_at":"2026-05-18T00:17:36.619984Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:17:36.619984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"axYve8Wqp199bWQELSSpYtgDM4BMdRpVdXsSF7U9QBz6ioCsQOuXXjOh+/Dzp6UsevyNoiji8iRFll9Kb8XYBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:17:36.620591Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.09003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c63688cd2b400d3567567356affcfb107998c7f6cea519cca576827350ceab1c","sha256:48f6c7ce72dbcf1e10e95d5789c896e7ee495e6f063f2771a0a388c687762069"],"state_sha256":"7b05ea49466b4b5e3f858a6a73cdccaa0e7fd2e870e670c3f7228d9c2d08b2ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Xjk4meFUuzeYbqqsoZcozh4sjGSeE6Ie64cHnsjPq7KX7rw8xf0fJKun7mO7/9/8a+DS/FhKpJ2TkpjBeEVAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:22:41.133704Z","bundle_sha256":"412ec059039202d3a45fd98315e1631185292d7640a5dddeb46bbc2394e978d8"}}