{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2WPE6AR4LKRNZTZW5FI7ZOJJQR","short_pith_number":"pith:2WPE6AR4","canonical_record":{"source":{"id":"1908.03323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-09T05:58:18Z","cross_cats_sorted":[],"title_canon_sha256":"52520d7b2bae314f49142798cbc93958bd8798fc2f5accd650b43054f1330aad","abstract_canon_sha256":"fc800145f79f8a7f5538cbdd902b39ea41649a76ecb27e69884b69c9f9af8a3b"},"schema_version":"1.0"},"canonical_sha256":"d59e4f023c5aa2dccf36e951fcb929844d645d16ea7f1afeb161a5304ab51840","source":{"kind":"arxiv","id":"1908.03323","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03323","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03323v1","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03323","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_12","alias_value":"2WPE6AR4LKRN","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_16","alias_value":"2WPE6AR4LKRNZTZW","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_8","alias_value":"2WPE6AR4","created_at":"2026-07-04T23:52:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2WPE6AR4LKRNZTZW5FI7ZOJJQR","target":"record","payload":{"canonical_record":{"source":{"id":"1908.03323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-09T05:58:18Z","cross_cats_sorted":[],"title_canon_sha256":"52520d7b2bae314f49142798cbc93958bd8798fc2f5accd650b43054f1330aad","abstract_canon_sha256":"fc800145f79f8a7f5538cbdd902b39ea41649a76ecb27e69884b69c9f9af8a3b"},"schema_version":"1.0"},"canonical_sha256":"d59e4f023c5aa2dccf36e951fcb929844d645d16ea7f1afeb161a5304ab51840","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:52:38.894179Z","signature_b64":"QbMjINGvfcuxmVjkU4ZLasUFOAKVxmQIT8tY1SP1mbyCu/w8qHdqhfKz7JocqtJrVG1GocS8u3rtdzc3B372Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d59e4f023c5aa2dccf36e951fcb929844d645d16ea7f1afeb161a5304ab51840","last_reissued_at":"2026-07-04T23:52:38.893798Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:52:38.893798Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.03323","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":"2026-07-04T23:52:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UWwsOtyZEW3+Q2evaDktqEGdhnCTJ/mj+flV5gATh/LZlLUHOEkLxx948fntJAYb3kmTNqFBqP1+pNC4tQZyCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T15:48:28.418174Z"},"content_sha256":"9281c9adaaa9a36e7fda60c4787bb6a7268c26d4ea4e57681a41e67610310cbd","schema_version":"1.0","event_id":"sha256:9281c9adaaa9a36e7fda60c4787bb6a7268c26d4ea4e57681a41e67610310cbd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2WPE6AR4LKRNZTZW5FI7ZOJJQR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Convex hull algorithms based on some variational models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Jiang Yang, Lingfeng Li, Shousheng Luo, Xue-Cheng Tai","submitted_at":"2019-08-09T05:58:18Z","abstract_excerpt":"Seeking the convex hull of an object is a very fundamental problem arising from various tasks. In this work, we propose two variational convex hull models using level set representation for 2-dimensional data. The first one is an exact model, which can get the convex hull of one or multiple objects. In this model, the convex hull is characterized by the zero sublevel-set of a convex level set function, which is non-positive at every given point. By minimizing the area of the zero sublevel-set, we can find the desired convex hull. The second one is intended to get convex hull of objects with ou"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03323","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/1908.03323/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":"2026-07-04T23:52:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dcvGriXrH9IVbrtxU1PvdG+2T853J5kkTXiAN/7L5GvfTzl7AsEgPPnI0VjxbAoipS2vIzUCYr/mTN3NwB8wCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T15:48:28.418514Z"},"content_sha256":"93aec0d7901f55e420c4ab90b37f5037f9c11f7db2ce12ec6167eb2b6db04c7b","schema_version":"1.0","event_id":"sha256:93aec0d7901f55e420c4ab90b37f5037f9c11f7db2ce12ec6167eb2b6db04c7b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/bundle.json","state_url":"https://pith.science/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/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":"2026-08-23T15:48:28Z","links":{"resolver":"https://pith.science/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR","bundle":"https://pith.science/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/bundle.json","state":"https://pith.science/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2WPE6AR4LKRNZTZW5FI7ZOJJQR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2WPE6AR4LKRNZTZW5FI7ZOJJQR","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":"fc800145f79f8a7f5538cbdd902b39ea41649a76ecb27e69884b69c9f9af8a3b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-09T05:58:18Z","title_canon_sha256":"52520d7b2bae314f49142798cbc93958bd8798fc2f5accd650b43054f1330aad"},"schema_version":"1.0","source":{"id":"1908.03323","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03323","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03323v1","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03323","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_12","alias_value":"2WPE6AR4LKRN","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_16","alias_value":"2WPE6AR4LKRNZTZW","created_at":"2026-07-04T23:52:38Z"},{"alias_kind":"pith_short_8","alias_value":"2WPE6AR4","created_at":"2026-07-04T23:52:38Z"}],"graph_snapshots":[{"event_id":"sha256:93aec0d7901f55e420c4ab90b37f5037f9c11f7db2ce12ec6167eb2b6db04c7b","target":"graph","created_at":"2026-07-04T23:52:38Z","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/1908.03323/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Seeking the convex hull of an object is a very fundamental problem arising from various tasks. In this work, we propose two variational convex hull models using level set representation for 2-dimensional data. The first one is an exact model, which can get the convex hull of one or multiple objects. In this model, the convex hull is characterized by the zero sublevel-set of a convex level set function, which is non-positive at every given point. By minimizing the area of the zero sublevel-set, we can find the desired convex hull. The second one is intended to get convex hull of objects with ou","authors_text":"Jiang Yang, Lingfeng Li, Shousheng Luo, Xue-Cheng Tai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-09T05:58:18Z","title":"Convex hull algorithms based on some variational models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03323","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":"sha256:9281c9adaaa9a36e7fda60c4787bb6a7268c26d4ea4e57681a41e67610310cbd","target":"record","created_at":"2026-07-04T23:52:38Z","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":"fc800145f79f8a7f5538cbdd902b39ea41649a76ecb27e69884b69c9f9af8a3b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-09T05:58:18Z","title_canon_sha256":"52520d7b2bae314f49142798cbc93958bd8798fc2f5accd650b43054f1330aad"},"schema_version":"1.0","source":{"id":"1908.03323","kind":"arxiv","version":1}},"canonical_sha256":"d59e4f023c5aa2dccf36e951fcb929844d645d16ea7f1afeb161a5304ab51840","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d59e4f023c5aa2dccf36e951fcb929844d645d16ea7f1afeb161a5304ab51840","first_computed_at":"2026-07-04T23:52:38.893798Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:52:38.893798Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QbMjINGvfcuxmVjkU4ZLasUFOAKVxmQIT8tY1SP1mbyCu/w8qHdqhfKz7JocqtJrVG1GocS8u3rtdzc3B372Bg==","signature_status":"signed_v1","signed_at":"2026-07-04T23:52:38.894179Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.03323","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9281c9adaaa9a36e7fda60c4787bb6a7268c26d4ea4e57681a41e67610310cbd","sha256:93aec0d7901f55e420c4ab90b37f5037f9c11f7db2ce12ec6167eb2b6db04c7b"],"state_sha256":"57f6b290c4167e204187073f627f69f11de26c98535d401e90378996cc33822f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5WK2g/wvwvKlgo1HbqAMccP2T54pVRvgqd2fP9QqWgZAcG1atgMyX9uUNUafmK/0UnSrTbZlzZqE0phW7T1AAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T15:48:28.421501Z","bundle_sha256":"c5cd5e8fb9dd2a63ab515804bd8e341dbcff681513f3d60660f3fc90f9841261"}}