{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:IRLPTA3ZTHP3XGKLG4I52EKCKR","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":"fb702f7bef683501e97f8a1197f05bb9f5608c04a573521b1665ade5ff67a733","cross_cats_sorted":["cs.GR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-03-06T10:50:40Z","title_canon_sha256":"4e344f33d94aba2cfc731b65eaaa8ad3aa110d6559a331fc90b5a297421b6cbd"},"schema_version":"1.0","source":{"id":"1503.01903","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.01903","created_at":"2026-05-18T02:25:27Z"},{"alias_kind":"arxiv_version","alias_value":"1503.01903v1","created_at":"2026-05-18T02:25:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.01903","created_at":"2026-05-18T02:25:27Z"},{"alias_kind":"pith_short_12","alias_value":"IRLPTA3ZTHP3","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"IRLPTA3ZTHP3XGKL","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"IRLPTA3Z","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:47506c5fa23c2857a4071edfe1f9742dfb16c7221f7ee9f1dbeed1d1f7935c40","target":"graph","created_at":"2026-05-18T02:25:27Z","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":"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","authors_text":"A. Mousnier, C. Guillemot, E. Vural","cross_cats":["cs.GR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-03-06T10:50:40Z","title":"Partial light field tomographic reconstruction from a fixed-camera focal stack"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.01903","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":"sha256:05a39fc31afff41b430939dfa5a676db2598d72c76a23d0041eebad6b6f5b236","target":"record","created_at":"2026-05-18T02:25:27Z","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":"fb702f7bef683501e97f8a1197f05bb9f5608c04a573521b1665ade5ff67a733","cross_cats_sorted":["cs.GR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-03-06T10:50:40Z","title_canon_sha256":"4e344f33d94aba2cfc731b65eaaa8ad3aa110d6559a331fc90b5a297421b6cbd"},"schema_version":"1.0","source":{"id":"1503.01903","kind":"arxiv","version":1}},"canonical_sha256":"4456f9837999dfbb994b3711dd11425470f719cb9ecc8ba4d156de9081e5deef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4456f9837999dfbb994b3711dd11425470f719cb9ecc8ba4d156de9081e5deef","first_computed_at":"2026-05-18T02:25:27.311021Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:25:27.311021Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E2WqX2FsVbKvOJHBu6K/B75gpHy+dDz1mkcct8dSD3cgaicu2eaUpquTwH++YaBtj90vT84kcLpl/GbGn9C3DA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:25:27.311493Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.01903","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05a39fc31afff41b430939dfa5a676db2598d72c76a23d0041eebad6b6f5b236","sha256:47506c5fa23c2857a4071edfe1f9742dfb16c7221f7ee9f1dbeed1d1f7935c40"],"state_sha256":"dd90b2f63f97c1ff7f605b73527663c717d0a69000b61c6a796ff50b2fa5d2eb"}