{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:L5KA4WPYXIJX5DO4JBFR66BRCQ","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":"b7dc003191c3e79e4bf31761af5f923f614d0a2d0c6c3a55642a884cf9f91799","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-11-22T12:15:30Z","title_canon_sha256":"89f8f72a87ba4acb90016de34e4d7af63d61d7ecdada2ec7c897d26efb09de0a"},"schema_version":"1.0","source":{"id":"1811.09131","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.09131","created_at":"2026-05-18T00:00:06Z"},{"alias_kind":"arxiv_version","alias_value":"1811.09131v1","created_at":"2026-05-18T00:00:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.09131","created_at":"2026-05-18T00:00:06Z"},{"alias_kind":"pith_short_12","alias_value":"L5KA4WPYXIJX","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"L5KA4WPYXIJX5DO4","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"L5KA4WPY","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:9fe43cb33996d7b46d3525f521139d8063bc78c59f8ecae2c924da7af1c66811","target":"graph","created_at":"2026-05-18T00:00:06Z","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":"The estimation of the optical properties of a material from RGB-images is an important but extremely ill-posed problem in Computer Graphics. While recent works have successfully approached this problem even from just a single photograph, significant simplifications of the material model are assumed, limiting the usability of such methods. The detection of complex material properties such as anisotropy or Fresnel effect remains an unsolved challenge. We propose a novel method that predicts the model parameters of an artist-friendly, physically-based BRDF, from only two low-resolution shots of t","authors_text":"Dan Casas, Elena Garces, Jorge Lopez-Moreno, Raquel Vidaurre","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-11-22T12:15:30Z","title":"BRDF Estimation of Complex Materials with Nested Learning"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.09131","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:a048e6b823320ec05ebf9ac4a02ded565b6c597a1ea8675ed6e3819377b98745","target":"record","created_at":"2026-05-18T00:00:06Z","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":"b7dc003191c3e79e4bf31761af5f923f614d0a2d0c6c3a55642a884cf9f91799","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-11-22T12:15:30Z","title_canon_sha256":"89f8f72a87ba4acb90016de34e4d7af63d61d7ecdada2ec7c897d26efb09de0a"},"schema_version":"1.0","source":{"id":"1811.09131","kind":"arxiv","version":1}},"canonical_sha256":"5f540e59f8ba137e8ddc484b1f783114294a0d5a30016b41de80ef53a620b808","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f540e59f8ba137e8ddc484b1f783114294a0d5a30016b41de80ef53a620b808","first_computed_at":"2026-05-18T00:00:06.972960Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:06.972960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yiuaXQIw2YzgWInlhJoI3FYD6vGMa5fHs6JBgC2EP2vIii/uPUAwaksGwEeCfojfPoJLyu450oCP+mKX2qc0Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:06.973485Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.09131","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a048e6b823320ec05ebf9ac4a02ded565b6c597a1ea8675ed6e3819377b98745","sha256:9fe43cb33996d7b46d3525f521139d8063bc78c59f8ecae2c924da7af1c66811"],"state_sha256":"e2ec53969a77668443ac06df08ea6000ae067bd1be6fb5231a49831d8f8ace38"}