{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:BUPG6OQ5MUX54GBHPDZP7PVJLA","short_pith_number":"pith:BUPG6OQ5","canonical_record":{"source":{"id":"physics/0111117","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"physics.data-an","submitted_at":"2001-11-14T10:49:46Z","cross_cats_sorted":[],"title_canon_sha256":"daa5f417c73cd5d5217ae9573b2f1457cae84a0679c68cf5aa259eba6f1fbbe7","abstract_canon_sha256":"b189466379688a717a875050e0b0a0158a82a9c8f685214d6126a386ed298d30"},"schema_version":"1.0"},"canonical_sha256":"0d1e6f3a1d652fde182778f2ffbea958125072afd8dbb95b9b820ed951540e23","source":{"kind":"arxiv","id":"physics/0111117","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0111117","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0111117v1","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0111117","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_12","alias_value":"BUPG6OQ5MUX5","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_16","alias_value":"BUPG6OQ5MUX54GBH","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_8","alias_value":"BUPG6OQ5","created_at":"2026-07-04T14:43:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:BUPG6OQ5MUX54GBHPDZP7PVJLA","target":"record","payload":{"canonical_record":{"source":{"id":"physics/0111117","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"physics.data-an","submitted_at":"2001-11-14T10:49:46Z","cross_cats_sorted":[],"title_canon_sha256":"daa5f417c73cd5d5217ae9573b2f1457cae84a0679c68cf5aa259eba6f1fbbe7","abstract_canon_sha256":"b189466379688a717a875050e0b0a0158a82a9c8f685214d6126a386ed298d30"},"schema_version":"1.0"},"canonical_sha256":"0d1e6f3a1d652fde182778f2ffbea958125072afd8dbb95b9b820ed951540e23","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:43:31.862733Z","signature_b64":"bIRL+lm5Mk5OSRy7oq3aTRU3ma5Igq0WehecPhzzMVHCUiZgYGhYyBFmClzEC55kwmeZD+qLzvnAz1Li6eEOCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0d1e6f3a1d652fde182778f2ffbea958125072afd8dbb95b9b820ed951540e23","last_reissued_at":"2026-07-04T14:43:31.862265Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:43:31.862265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"physics/0111117","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":"2026-07-04T14:43:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gm3QJthm3NIYYVLrXN5mg3yZQ8Q/5MqSIdoVCXVoDjfGiMx6CFUfNrSAqLmgftriOTyUbV4MPEMjrIbYiLZiCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:05:39.437169Z"},"content_sha256":"488c52854ac60281ef1978d723fe3dd598556611eab2a4a5ea096cae8a1fdca1","schema_version":"1.0","event_id":"sha256:488c52854ac60281ef1978d723fe3dd598556611eab2a4a5ea096cae8a1fdca1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:BUPG6OQ5MUX54GBHPDZP7PVJLA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Shape reconstruction in X-ray tomography from a small number of projections using deformable models","license":"","headline":"","cross_cats":[],"primary_cat":"physics.data-an","authors_text":"A. Mohammad-Djafari (Laboratoire des Signaux et Syst\\`emes, CNRS-UPS-SUPELEC, France), Gif-sur-Yvette, Indiana, Ken Sauer (Department of Electrical Engineering, University of Notre Dame, USA)","submitted_at":"2001-11-14T10:49:46Z","abstract_excerpt":"X-ray tomographic image reconstruction consists of determining an object function from its projections. In many applications such as non-destructive testing, we look for a fault region (air) in a homogeneous, known background (metal). The image reconstruction problem then becomes the determination of the shape of the default region. Two approaches can be used: modeling the image as a binary Markov random field and estimating the pixels of the image, or modeling the shape of the fault and estimating it directly from the projections. In this work we model the fault shape by a deformable polygona"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0111117","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/physics/0111117/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":"2026-07-04T14:43:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hxUqSwft9zJimRc1LL7BjSFKHN2JcdB6mjC1+M8ctyhQSiHZSHzfB9iDLagJnWzmv8xYOliiHvTeqaSTtqDYAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:05:39.437827Z"},"content_sha256":"729dc5a4fc8246aeecbe21c7d39152f5df59ff00ee7c9b5125f7136cd140a604","schema_version":"1.0","event_id":"sha256:729dc5a4fc8246aeecbe21c7d39152f5df59ff00ee7c9b5125f7136cd140a604"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/bundle.json","state_url":"https://pith.science/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/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":"2026-08-03T21:05:39Z","links":{"resolver":"https://pith.science/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA","bundle":"https://pith.science/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/bundle.json","state":"https://pith.science/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BUPG6OQ5MUX54GBHPDZP7PVJLA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:BUPG6OQ5MUX54GBHPDZP7PVJLA","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":"b189466379688a717a875050e0b0a0158a82a9c8f685214d6126a386ed298d30","cross_cats_sorted":[],"license":"","primary_cat":"physics.data-an","submitted_at":"2001-11-14T10:49:46Z","title_canon_sha256":"daa5f417c73cd5d5217ae9573b2f1457cae84a0679c68cf5aa259eba6f1fbbe7"},"schema_version":"1.0","source":{"id":"physics/0111117","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0111117","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0111117v1","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0111117","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_12","alias_value":"BUPG6OQ5MUX5","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_16","alias_value":"BUPG6OQ5MUX54GBH","created_at":"2026-07-04T14:43:31Z"},{"alias_kind":"pith_short_8","alias_value":"BUPG6OQ5","created_at":"2026-07-04T14:43:31Z"}],"graph_snapshots":[{"event_id":"sha256:729dc5a4fc8246aeecbe21c7d39152f5df59ff00ee7c9b5125f7136cd140a604","target":"graph","created_at":"2026-07-04T14:43:31Z","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/physics/0111117/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"X-ray tomographic image reconstruction consists of determining an object function from its projections. In many applications such as non-destructive testing, we look for a fault region (air) in a homogeneous, known background (metal). The image reconstruction problem then becomes the determination of the shape of the default region. Two approaches can be used: modeling the image as a binary Markov random field and estimating the pixels of the image, or modeling the shape of the fault and estimating it directly from the projections. In this work we model the fault shape by a deformable polygona","authors_text":"A. Mohammad-Djafari (Laboratoire des Signaux et Syst\\`emes, CNRS-UPS-SUPELEC, France), Gif-sur-Yvette, Indiana, Ken Sauer (Department of Electrical Engineering, University of Notre Dame, USA)","cross_cats":[],"headline":"","license":"","primary_cat":"physics.data-an","submitted_at":"2001-11-14T10:49:46Z","title":"Shape reconstruction in X-ray tomography from a small number of projections using deformable models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0111117","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":"sha256:488c52854ac60281ef1978d723fe3dd598556611eab2a4a5ea096cae8a1fdca1","target":"record","created_at":"2026-07-04T14:43:31Z","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":"b189466379688a717a875050e0b0a0158a82a9c8f685214d6126a386ed298d30","cross_cats_sorted":[],"license":"","primary_cat":"physics.data-an","submitted_at":"2001-11-14T10:49:46Z","title_canon_sha256":"daa5f417c73cd5d5217ae9573b2f1457cae84a0679c68cf5aa259eba6f1fbbe7"},"schema_version":"1.0","source":{"id":"physics/0111117","kind":"arxiv","version":1}},"canonical_sha256":"0d1e6f3a1d652fde182778f2ffbea958125072afd8dbb95b9b820ed951540e23","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0d1e6f3a1d652fde182778f2ffbea958125072afd8dbb95b9b820ed951540e23","first_computed_at":"2026-07-04T14:43:31.862265Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:43:31.862265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bIRL+lm5Mk5OSRy7oq3aTRU3ma5Igq0WehecPhzzMVHCUiZgYGhYyBFmClzEC55kwmeZD+qLzvnAz1Li6eEOCA==","signature_status":"signed_v1","signed_at":"2026-07-04T14:43:31.862733Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/0111117","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:488c52854ac60281ef1978d723fe3dd598556611eab2a4a5ea096cae8a1fdca1","sha256:729dc5a4fc8246aeecbe21c7d39152f5df59ff00ee7c9b5125f7136cd140a604"],"state_sha256":"9d79bd0d2db312d49a8061e7da51f6b95f4c84d325a7267b9f0e4696178bbf89"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XW5ewn/msWzTTb/EY6/u76VyLzfFIves7Hdpy7LSub8Wq6EZgkMu40mUIyTEdEM7WPXZUOol33UKzglcdF39Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T21:05:39.442534Z","bundle_sha256":"94762e192789fbf3da9ff713a0e59a80216d7bb1d1bbb4f8613d15667d22740f"}}