{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2NK6IBNRYTIVDWF4Q74UYYIPNV","short_pith_number":"pith:2NK6IBNR","canonical_record":{"source":{"id":"1901.02513","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-01-08T20:47:46Z","cross_cats_sorted":["cs.CV","cs.LG","stat.ML"],"title_canon_sha256":"7f182217fcfb67b1493d107db001034172dd3b7b6b465d28f5ad42a705d76f24","abstract_canon_sha256":"597d37df8a27c78593f77b1aa0bc5ff358f2fd5746c423d332c6869a637025fd"},"schema_version":"1.0"},"canonical_sha256":"d355e405b1c4d151d8bc87f94c610f6d7c16be52f57014b046bd7f0ada961455","source":{"kind":"arxiv","id":"1901.02513","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02513","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02513v2","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02513","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"pith_short_12","alias_value":"2NK6IBNRYTIV","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"2NK6IBNRYTIVDWF4","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"2NK6IBNR","created_at":"2026-05-18T12:33:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2NK6IBNRYTIVDWF4Q74UYYIPNV","target":"record","payload":{"canonical_record":{"source":{"id":"1901.02513","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-01-08T20:47:46Z","cross_cats_sorted":["cs.CV","cs.LG","stat.ML"],"title_canon_sha256":"7f182217fcfb67b1493d107db001034172dd3b7b6b465d28f5ad42a705d76f24","abstract_canon_sha256":"597d37df8a27c78593f77b1aa0bc5ff358f2fd5746c423d332c6869a637025fd"},"schema_version":"1.0"},"canonical_sha256":"d355e405b1c4d151d8bc87f94c610f6d7c16be52f57014b046bd7f0ada961455","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:49.677487Z","signature_b64":"rc3v/gVri8m4vHIurwYeOSeVYgtz4s+Lfmutmw0KPhIVD8eanephinCOFOyFQjULlPlUxdrDNBuEDZU1dVa0Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d355e405b1c4d151d8bc87f94c610f6d7c16be52f57014b046bd7f0ada961455","last_reissued_at":"2026-05-17T23:53:49.676856Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:49.676856Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.02513","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":"2026-05-17T23:53:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ah3Rrq3CtIhYWoxxLdM6qt5UjgWiQslT/2RuFwygerCQY7FgFNipZCeO+2+i7fcXru8EB1qXhn36/4CHoFzBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T20:08:26.731742Z"},"content_sha256":"64fb0aaaa1266e6dbd0d3513413c691bbd667be6f5ae48aab767bc80f48740ff","schema_version":"1.0","event_id":"sha256:64fb0aaaa1266e6dbd0d3513413c691bbd667be6f5ae48aab767bc80f48740ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2NK6IBNRYTIVDWF4Q74UYYIPNV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Combining nonparametric spatial context priors with nonparametric shape priors for dendritic spine segmentation in 2-photon microscopy images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV","cs.LG","stat.ML"],"primary_cat":"eess.IV","authors_text":"Ali Ozgur Argunsah, Devrim Unay, Ertunc Erdil, Mujdat Cetin, Tolga Tasdizen","submitted_at":"2019-01-08T20:47:46Z","abstract_excerpt":"Data driven segmentation is an important initial step of shape prior-based segmentation methods since it is assumed that the data term brings a curve to a plausible level so that shape and data terms can then work together to produce better segmentations. When purely data driven segmentation produces poor results, the final segmentation is generally affected adversely. One challenge faced by many existing data terms is due to the fact that they consider only pixel intensities to decide whether to assign a pixel to the foreground or to the background region. When the distributions of the foregr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02513","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":"2026-05-17T23:53:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gBZdPB4avKfgKSmdHLauaqGe5bExGZNjlHIRBnKRCGhf3EsbWIpQFykOqj3rnJ9yCqbncL8gzddXYOZXobNSDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T20:08:26.732107Z"},"content_sha256":"7c0d5e985fe5ce9c3c82f19ceb419f8bca89b72f7474257b8da424327a84ad18","schema_version":"1.0","event_id":"sha256:7c0d5e985fe5ce9c3c82f19ceb419f8bca89b72f7474257b8da424327a84ad18"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/bundle.json","state_url":"https://pith.science/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/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":"2026-06-20T20:08:26Z","links":{"resolver":"https://pith.science/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV","bundle":"https://pith.science/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/bundle.json","state":"https://pith.science/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2NK6IBNRYTIVDWF4Q74UYYIPNV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2NK6IBNRYTIVDWF4Q74UYYIPNV","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":"597d37df8a27c78593f77b1aa0bc5ff358f2fd5746c423d332c6869a637025fd","cross_cats_sorted":["cs.CV","cs.LG","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-01-08T20:47:46Z","title_canon_sha256":"7f182217fcfb67b1493d107db001034172dd3b7b6b465d28f5ad42a705d76f24"},"schema_version":"1.0","source":{"id":"1901.02513","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02513","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02513v2","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02513","created_at":"2026-05-17T23:53:49Z"},{"alias_kind":"pith_short_12","alias_value":"2NK6IBNRYTIV","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"2NK6IBNRYTIVDWF4","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"2NK6IBNR","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:7c0d5e985fe5ce9c3c82f19ceb419f8bca89b72f7474257b8da424327a84ad18","target":"graph","created_at":"2026-05-17T23:53:49Z","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":"Data driven segmentation is an important initial step of shape prior-based segmentation methods since it is assumed that the data term brings a curve to a plausible level so that shape and data terms can then work together to produce better segmentations. When purely data driven segmentation produces poor results, the final segmentation is generally affected adversely. One challenge faced by many existing data terms is due to the fact that they consider only pixel intensities to decide whether to assign a pixel to the foreground or to the background region. When the distributions of the foregr","authors_text":"Ali Ozgur Argunsah, Devrim Unay, Ertunc Erdil, Mujdat Cetin, Tolga Tasdizen","cross_cats":["cs.CV","cs.LG","stat.ML"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-01-08T20:47:46Z","title":"Combining nonparametric spatial context priors with nonparametric shape priors for dendritic spine segmentation in 2-photon microscopy images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02513","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":"sha256:64fb0aaaa1266e6dbd0d3513413c691bbd667be6f5ae48aab767bc80f48740ff","target":"record","created_at":"2026-05-17T23:53:49Z","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":"597d37df8a27c78593f77b1aa0bc5ff358f2fd5746c423d332c6869a637025fd","cross_cats_sorted":["cs.CV","cs.LG","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-01-08T20:47:46Z","title_canon_sha256":"7f182217fcfb67b1493d107db001034172dd3b7b6b465d28f5ad42a705d76f24"},"schema_version":"1.0","source":{"id":"1901.02513","kind":"arxiv","version":2}},"canonical_sha256":"d355e405b1c4d151d8bc87f94c610f6d7c16be52f57014b046bd7f0ada961455","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d355e405b1c4d151d8bc87f94c610f6d7c16be52f57014b046bd7f0ada961455","first_computed_at":"2026-05-17T23:53:49.676856Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:53:49.676856Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rc3v/gVri8m4vHIurwYeOSeVYgtz4s+Lfmutmw0KPhIVD8eanephinCOFOyFQjULlPlUxdrDNBuEDZU1dVa0Ag==","signature_status":"signed_v1","signed_at":"2026-05-17T23:53:49.677487Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.02513","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:64fb0aaaa1266e6dbd0d3513413c691bbd667be6f5ae48aab767bc80f48740ff","sha256:7c0d5e985fe5ce9c3c82f19ceb419f8bca89b72f7474257b8da424327a84ad18"],"state_sha256":"5a71f79904fbfe9410cdcce7c0a8783efdd4958701373bb62c469922596bc113"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NRrqR/zdBMZ9mcc9FEuLYWhKJeySYFCOcqsvOGUl3Hm+vDrCaKyFAuU7E70gdkbs3c787tnLoXa3GCuI05ZFDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T20:08:26.734148Z","bundle_sha256":"bcb70c0280869efaea43179bdded0d3e170d04f5359088fb43cd82fb8a0d01f7"}}