{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:BIWFT4JJYPQ3HBRSW3C3JWQF4Z","short_pith_number":"pith:BIWFT4JJ","canonical_record":{"source":{"id":"1801.09472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-01-29T12:29:44Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"9fb3c1cafd9bada8b251f00c78d3bc5109aed1f6eaebc63c509e62e567b825dd","abstract_canon_sha256":"7260d5f5063ef7dfb0c5c1ce27601777bf55cf21a2877531ce462d4b465a0b32"},"schema_version":"1.0"},"canonical_sha256":"0a2c59f129c3e1b38632b6c5b4da05e64ad4d5713c4031e72c37578a183dfecc","source":{"kind":"arxiv","id":"1801.09472","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.09472","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"arxiv_version","alias_value":"1801.09472v2","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.09472","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"pith_short_12","alias_value":"BIWFT4JJYPQ3","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BIWFT4JJYPQ3HBRS","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BIWFT4JJ","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:BIWFT4JJYPQ3HBRSW3C3JWQF4Z","target":"record","payload":{"canonical_record":{"source":{"id":"1801.09472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-01-29T12:29:44Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"9fb3c1cafd9bada8b251f00c78d3bc5109aed1f6eaebc63c509e62e567b825dd","abstract_canon_sha256":"7260d5f5063ef7dfb0c5c1ce27601777bf55cf21a2877531ce462d4b465a0b32"},"schema_version":"1.0"},"canonical_sha256":"0a2c59f129c3e1b38632b6c5b4da05e64ad4d5713c4031e72c37578a183dfecc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:53.864823Z","signature_b64":"KTNNbdILAN9+ku5OnCN3dmUfiGf715FgOm6f14HdK12ONoQaXVIM6gTQ4ti0+DnTrkF3Cj+iNGjR8dozNAZpAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0a2c59f129c3e1b38632b6c5b4da05e64ad4d5713c4031e72c37578a183dfecc","last_reissued_at":"2026-05-18T00:14:53.864082Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:53.864082Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.09472","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":"2026-05-18T00:14:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"92L9C5iXXNQSExNixP38wZIslAmD9SU0HjXlR2vV2T3tVg/yX4zwEy23O68lCCnmDQWcIkfLJW0zzD2+n7/OAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:56:13.836755Z"},"content_sha256":"393fe4aab235eb8793bf2191bf9de4f33cacb26e6824e2ea2c3b17f7dcf1f83c","schema_version":"1.0","event_id":"sha256:393fe4aab235eb8793bf2191bf9de4f33cacb26e6824e2ea2c3b17f7dcf1f83c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:BIWFT4JJYPQ3HBRSW3C3JWQF4Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hyper-Hue and EMAP on Hyperspectral Images for Supervised Layer Decomposition of Old Master Drawings","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DL"],"primary_cat":"cs.CV","authors_text":"AmirAbbas Davari, Andreas Maier, Armin Haeberle, Christian Riess, Nikolaos Sakaltras, Sulaiman Vesal, Vincent Christlein","submitted_at":"2018-01-29T12:29:44Z","abstract_excerpt":"Old master drawings were mostly created step by step in several layers using different materials. To art historians and restorers, examination of these layers brings various insights into the artistic work process and helps to answer questions about the object, its attribution and its authenticity. However, these layers typically overlap and are oftentimes difficult to differentiate with the unaided eye. For example, a common layer combination is red chalk under ink.\n  In this work, we propose an image processing pipeline that operates on hyperspectral images to separate such layers. Using thi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.09472","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":""},"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":"2026-05-18T00:14:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BYfjssPzC+jWZYuIRuKDOh6YGfGMe19Kh2sFkSvoETh90exgt3nCE/IrTfe9JWUFqB44/0B6jj7WlZoKkAfSAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:56:13.837330Z"},"content_sha256":"c29352c9a287d5c140b9069f754dbbc897e7fe05ed177d83e82b7515835300b0","schema_version":"1.0","event_id":"sha256:c29352c9a287d5c140b9069f754dbbc897e7fe05ed177d83e82b7515835300b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/bundle.json","state_url":"https://pith.science/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/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":"2026-05-27T20:56:13Z","links":{"resolver":"https://pith.science/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z","bundle":"https://pith.science/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/bundle.json","state":"https://pith.science/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BIWFT4JJYPQ3HBRSW3C3JWQF4Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BIWFT4JJYPQ3HBRSW3C3JWQF4Z","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":"7260d5f5063ef7dfb0c5c1ce27601777bf55cf21a2877531ce462d4b465a0b32","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-01-29T12:29:44Z","title_canon_sha256":"9fb3c1cafd9bada8b251f00c78d3bc5109aed1f6eaebc63c509e62e567b825dd"},"schema_version":"1.0","source":{"id":"1801.09472","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.09472","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"arxiv_version","alias_value":"1801.09472v2","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.09472","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"pith_short_12","alias_value":"BIWFT4JJYPQ3","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BIWFT4JJYPQ3HBRS","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BIWFT4JJ","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:c29352c9a287d5c140b9069f754dbbc897e7fe05ed177d83e82b7515835300b0","target":"graph","created_at":"2026-05-18T00:14:53Z","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":"Old master drawings were mostly created step by step in several layers using different materials. To art historians and restorers, examination of these layers brings various insights into the artistic work process and helps to answer questions about the object, its attribution and its authenticity. However, these layers typically overlap and are oftentimes difficult to differentiate with the unaided eye. For example, a common layer combination is red chalk under ink.\n  In this work, we propose an image processing pipeline that operates on hyperspectral images to separate such layers. Using thi","authors_text":"AmirAbbas Davari, Andreas Maier, Armin Haeberle, Christian Riess, Nikolaos Sakaltras, Sulaiman Vesal, Vincent Christlein","cross_cats":["cs.DL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-01-29T12:29:44Z","title":"Hyper-Hue and EMAP on Hyperspectral Images for Supervised Layer Decomposition of Old Master Drawings"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.09472","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":"sha256:393fe4aab235eb8793bf2191bf9de4f33cacb26e6824e2ea2c3b17f7dcf1f83c","target":"record","created_at":"2026-05-18T00:14:53Z","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":"7260d5f5063ef7dfb0c5c1ce27601777bf55cf21a2877531ce462d4b465a0b32","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-01-29T12:29:44Z","title_canon_sha256":"9fb3c1cafd9bada8b251f00c78d3bc5109aed1f6eaebc63c509e62e567b825dd"},"schema_version":"1.0","source":{"id":"1801.09472","kind":"arxiv","version":2}},"canonical_sha256":"0a2c59f129c3e1b38632b6c5b4da05e64ad4d5713c4031e72c37578a183dfecc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0a2c59f129c3e1b38632b6c5b4da05e64ad4d5713c4031e72c37578a183dfecc","first_computed_at":"2026-05-18T00:14:53.864082Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:53.864082Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KTNNbdILAN9+ku5OnCN3dmUfiGf715FgOm6f14HdK12ONoQaXVIM6gTQ4ti0+DnTrkF3Cj+iNGjR8dozNAZpAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:53.864823Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.09472","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:393fe4aab235eb8793bf2191bf9de4f33cacb26e6824e2ea2c3b17f7dcf1f83c","sha256:c29352c9a287d5c140b9069f754dbbc897e7fe05ed177d83e82b7515835300b0"],"state_sha256":"3d5394fb9d95ecdb6bbdcf73131707a3ef7b6786ec036d911019682fae6c0c9f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o6s9L/YGZt1DUMVnDsTrNI4WCKH8jmGP2Ee7inhNbknTSsgEDzMx9ZvZdFYsHv1VxGh+XBzb0ZDvcTCJIRcqBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T20:56:13.840832Z","bundle_sha256":"f611caf2c1487c47b3f1794dd8c6baf8ffebef9aca3b6f1c492a6e2190131e56"}}