{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:IRLPTA3ZTHP3XGKLG4I52EKCKR","short_pith_number":"pith:IRLPTA3Z","schema_version":"1.0","canonical_sha256":"4456f9837999dfbb994b3711dd11425470f719cb9ecc8ba4d156de9081e5deef","source":{"kind":"arxiv","id":"1503.01903","version":1},"attestation_state":"computed","paper":{"title":"Partial light field tomographic reconstruction from a fixed-camera focal stack","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.GR"],"primary_cat":"cs.CV","authors_text":"A. Mousnier, C. Guillemot, E. Vural","submitted_at":"2015-03-06T10:50:40Z","abstract_excerpt":"This paper describes a novel approach to partially reconstruct high-resolution 4D light fields from a stack of differently focused photographs taken with a fixed camera. First, a focus map is calculated from this stack using a simple approach combining gradient detection and region expansion with graph-cut. Then, this focus map is converted into a depth map thanks to the calibration of the camera. We proceed after this with the tomographic reconstruction of the epipolar images by back-projecting the focused regions of the scene only. We call it masked back-projection. The angles of back-projec"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1503.01903","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-03-06T10:50:40Z","cross_cats_sorted":["cs.GR"],"title_canon_sha256":"4e344f33d94aba2cfc731b65eaaa8ad3aa110d6559a331fc90b5a297421b6cbd","abstract_canon_sha256":"fb702f7bef683501e97f8a1197f05bb9f5608c04a573521b1665ade5ff67a733"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:25:27.311493Z","signature_b64":"E2WqX2FsVbKvOJHBu6K/B75gpHy+dDz1mkcct8dSD3cgaicu2eaUpquTwH++YaBtj90vT84kcLpl/GbGn9C3DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4456f9837999dfbb994b3711dd11425470f719cb9ecc8ba4d156de9081e5deef","last_reissued_at":"2026-05-18T02:25:27.311021Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:25:27.311021Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Partial light field tomographic reconstruction from a fixed-camera focal stack","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.GR"],"primary_cat":"cs.CV","authors_text":"A. Mousnier, C. Guillemot, E. Vural","submitted_at":"2015-03-06T10:50:40Z","abstract_excerpt":"This paper describes a novel approach to partially reconstruct high-resolution 4D light fields from a stack of differently focused photographs taken with a fixed camera. First, a focus map is calculated from this stack using a simple approach combining gradient detection and region expansion with graph-cut. Then, this focus map is converted into a depth map thanks to the calibration of the camera. We proceed after this with the tomographic reconstruction of the epipolar images by back-projecting the focused regions of the scene only. We call it masked back-projection. The angles of back-projec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.01903","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1503.01903","created_at":"2026-05-18T02:25:27.311091+00:00"},{"alias_kind":"arxiv_version","alias_value":"1503.01903v1","created_at":"2026-05-18T02:25:27.311091+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.01903","created_at":"2026-05-18T02:25:27.311091+00:00"},{"alias_kind":"pith_short_12","alias_value":"IRLPTA3ZTHP3","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_16","alias_value":"IRLPTA3ZTHP3XGKL","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_8","alias_value":"IRLPTA3Z","created_at":"2026-05-18T12:29:25.134429+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR","json":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR.json","graph_json":"https://pith.science/api/pith-number/IRLPTA3ZTHP3XGKLG4I52EKCKR/graph.json","events_json":"https://pith.science/api/pith-number/IRLPTA3ZTHP3XGKLG4I52EKCKR/events.json","paper":"https://pith.science/paper/IRLPTA3Z"},"agent_actions":{"view_html":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR","download_json":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR.json","view_paper":"https://pith.science/paper/IRLPTA3Z","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1503.01903&json=true","fetch_graph":"https://pith.science/api/pith-number/IRLPTA3ZTHP3XGKLG4I52EKCKR/graph.json","fetch_events":"https://pith.science/api/pith-number/IRLPTA3ZTHP3XGKLG4I52EKCKR/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR/action/storage_attestation","attest_author":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR/action/author_attestation","sign_citation":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR/action/citation_signature","submit_replication":"https://pith.science/pith/IRLPTA3ZTHP3XGKLG4I52EKCKR/action/replication_record"}},"created_at":"2026-05-18T02:25:27.311091+00:00","updated_at":"2026-05-18T02:25:27.311091+00:00"}